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Quiz 1
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Q.1
Which of the following flowers only once in its life-time?
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Jackfruit
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Bamboo species
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Papaya
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Mango
Explanation
Bamboo species are famously monocarpic — many bamboo species flower only once, often after decades of vegetative growth, and then die. Jackfruit, papaya, and mango all flower repeatedly, year after year.
Q.2
A toy car with charge \(q\) moves on a friction less horizontal plane surface under the influence of a uniform electric field (\vec{E}\). Due to the force (q\vec{E}\), its velocity increases from 0 to 6 m/s in one second duration. At that instant the direction of the field is reversed. The car continuous to move for two more seconds under the influence of this field. The average velocity and the average speed of the toy car between 0 to 3 seconds are respectively
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1 m/s, 3.5 m/s
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1 m/s, 3 m/s
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2 m/s, 3 m/s
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1.5 m/s, 3 m/s
Explanation
Phase 1 (0-1s): speeds up uniformly from 0 to 6 m/s, covering 3 m (area under v-t graph). Phase 2 (1-3s, field reversed): decelerates from 6 m/s, reaching 0 at t=2s (after covering another 3 m forward), then speeds up in the REVERSE direction, reaching -6 m/s at t=3s (covering 3 m backward). Net displacement (0 to 3s) = 3 + 3 − 3 = 3 m → average velocity = 3/3 = 1 m/s. Total distance travelled = 3 + 3 + 3 = 9 m → average speed = 9/3 = 3 m/s.
Q.3
If the mass of the sun were ten times smaller and the universal gravitational constant were ten times larger in magnitude, which of the following is not correct?
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Raindrops will fall faster
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Time period of a simple pendulum of the Earth would decrease
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\(g\) on the Earth will not change
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Walking on the ground would become more difficult.
Explanation
Earth's own surface gravity g = GM_earth/R_earth² — it depends only on Earth's mass, radius, and G, not on the Sun's mass at all. Since G is being increased tenfold here, g on Earth WOULD change (increase) as a direct result — so the claim that "g on Earth will not change" is the incorrect statement. (Raindrops falling faster, a shorter pendulum period, and walking becoming harder are all genuine consequences of g increasing due to the larger G.)
Q.4
In stratosphere, which of the following elements acts as a catalyst in degradation of ozone and release of molecular oxygen?
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Cl
0%
Oxygen
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Carbon
0%
Fe
Explanation
Chlorine atoms (released from CFCs breaking down in the stratosphere) act as a catalyst that breaks down ozone into molecular oxygen — a single Cl atom can destroy many thousands of ozone molecules without being consumed itself.
Q.5
Hormones secreted by the placenta to maintain pregnancy are
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hCG, hPL, progestogens, prolactin
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hCG, hPL, progestogens, estrogens
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hCG, progestogens, estrogens, glucocorticoids
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hCG, hPL, estrogens, relaxin, oxytocin
Explanation
The placenta secretes hCG (human chorionic gonadotropin), hPL (human placental lactogen), progestogens, and estrogens — all four work together to maintain pregnancy. (Prolactin is primarily a pituitary hormone, not a placental one.)
Q.6
Stomatal movement is not affected by
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\(CO_2\) concentration
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Light
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\(O_2\) concentration
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Temperature
Explanation
Stomatal opening and closing responds to CO₂ concentration, light, and temperature — but not directly to O₂ concentration, which isn't one of the standard regulating factors for stomatal movement.
Q.7
Which of these statements is incorrect?
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Enzymes of TCA cycle are present in mitochondrial matrix
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Glycolysis occurs in cytosol
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Oxidative phosphorylation takes place in outer mitochondrial membrane
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Glycolysis operates as long as it is supplied with NAD that can pick up hydrogen atoms
Explanation
Oxidative phosphorylation actually occurs on the INNER mitochondrial membrane (where the electron transport chain and ATP synthase are located), not the outer membrane — making this the incorrect statement. (TCA cycle enzymes in the matrix, glycolysis in the cytosol, and glycolysis needing a supply of NAD⁺ are all correct.)
Q.8
Which among the following is not a prokaryote?
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Oscillatoria
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Saccharomyces
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Nostoc
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Mycobacterium
Explanation
Saccharomyces is yeast — a eukaryotic fungus, with a true membrane-bound nucleus. Oscillatoria and Nostoc are cyanobacteria, and Mycobacterium is a bacterium — all three are prokaryotes.
Q.9
The efficiency of an ideal heat engine working between the freezing point and boiling point of water, is
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6.25%
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26.8%
0%
20%
0%
12.5%
Explanation
Carnot efficiency between 0°C (273 K) and 100°C (373 K): η = 1 − T_c/T_h = 1 − 273/373 = 100/373 ≈ 0.268 = 26.8%.
Q.10
Sweet potato is a modified
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Stem
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Tap root
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Adventitious root
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Rhizome
Explanation
Sweet potato is a modified adventitious root (a swollen tuberous root arising from adventitious roots) — unlike ordinary potato, which is a modified underground STEM (a tuber).
Q.11
Which of the following animals does not undergo metamorphosis?
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Tunicate
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Starfish
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Earthworm
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Moth
Explanation
Earthworms develop directly, with no distinct larval stage — unlike tunicates (tadpole larva), starfish (bipinnaria larva), and moths (caterpillar → pupa → adult), all of which undergo genuine metamorphosis.
Q.12
Which of the following is an amino acid derived hormone?
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Estradiol
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Ecdysone
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Epinephrine
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Estriol
Explanation
Epinephrine (adrenaline) is derived from the amino acid tyrosine, making it an amino-acid-derived hormone. Estradiol, ecdysone, and estriol are all steroid hormones instead.
Q.13
Calcium is important in skeletal muscle contraction because it
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Binds to troponin to remove the masking of active sites on actin for myosin.
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Activates the myosin ATPase by binding to it.
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Detaches the myosin head from the actin filament.
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Prevents the formation of bonds between the myosin cross bridges and the actin filament
Explanation
Calcium ions bind to troponin, which shifts tropomyosin away from actin's myosin-binding sites — unmasking those active sites so the myosin heads can attach and drive the sliding-filament mechanism of contraction.
Q.14
Which of the following gastric cells indirectly help in erythropoiesis?
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Goblet cells
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Mucous cells
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Chief cells
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Parietal cells
Explanation
Parietal cells secrete intrinsic factor (along with HCl), and intrinsic factor is required for vitamin B12 absorption — B12, in turn, is essential for red blood cell formation, so parietal cells support erythropoiesis indirectly.
Q.15
In India, the organisation responsible for assessing the safety of introducing genetically modified organisms for public use is
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Genetic Engineering Appraisal Committee (GEAC)
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Indian Council of Medical Research (ICMR)
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Council for Scientific and Industrial Research (CSIR)
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Research Committee on Genetic Manipulation (RCGM)
Explanation
In India, the Genetic Engineering Appraisal Committee (GEAC) is the regulatory body responsible for assessing the environmental and public safety of releasing genetically modified organisms.
Q.16
Select the correct match
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Matthew Meselson and F. Stahl - Pisum sativum
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Alfred Hershey and Martha Chase - TMV
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Alec Jeffreys - Streptococcus pneumoniae
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Francois Jacob and Jacques Monod - Lac operon
Explanation
Francois Jacob and Jacques Monod are correctly credited with proposing the lac operon model of gene regulation. (Meselson and Stahl worked with E. coli, not peas; Hershey and Chase used bacteriophages, not TMV; and Alec Jeffreys is known for DNA fingerprinting, not Streptococcus work — that's associated with Griffith/Avery's transformation experiments.)
Q.17
Stomata in grass leaf are
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Barrel shaped
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Kidney shaped
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Dumb-bell shaped
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Rectangular
Explanation
Grasses have distinctively dumb-bell shaped guard cells forming their stomata, unlike the kidney-shaped guard cells typical of most dicot leaves.
Q.18
Pneumatophores occur in
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Halophytes
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Submerged hydrophytes
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Carnivorous plants
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Free-floating hydrophytes
Explanation
Pneumatophores — specialised roots that grow upward out of waterlogged soil for gas exchange — are found in halophytes (salt-tolerant plants), notably mangroves growing in oxygen-poor saline mud.
Q.19
Which of the following elements is responsible for maintaining turgor in cells?
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Sodium
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Potassium
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Magnesium
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Calcium
Explanation
Potassium ions are the primary ion involved in maintaining osmotic pressure and turgor within plant cells — for example, K⁺ movement drives the turgor changes that open and close stomatal guard cells.
Q.20
Which one of the following plants shows a very close relationship with a species of moth, where none of the two can complete its life cycle without the other?
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Hydrilla
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Banana
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Viola
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Yucca
Explanation
The Yucca plant and the Yucca moth share a famous obligate mutualism — the moth is the plant's only pollinator, and the moth's larvae depend on the developing seeds for food, so neither species can complete its life cycle without the other.
Q.21
Match the columns
Column I
Column II
a. Fibrinogen
(i) Osmotic balance
b. Globulin
(ii) Blood clotting
c. Albumin
(iii) Defence mechanism
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a -- i b -- ii c -- iii
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a -- ii b -- iii c -- i
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a -- iii b -- ii c -- i
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a -- i b -- iii c -- ii
Explanation
Fibrinogen is a plasma protein central to blood clotting (ii). Globulins include antibodies, forming the core of the body's defence mechanism (iii). Albumin, the most abundant plasma protein, is chiefly responsible for maintaining osmotic (oncotic) balance in the blood (i).
Q.22
Which of the following is not a product of light reaction of photosynthesis?
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Oxygen
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NADPH
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ATP
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NADH
Explanation
The light reactions of photosynthesis produce oxygen, ATP, and NADPH — NADH (as opposed to NADPH) isn't a light-reaction product; it's generated later, in glycolysis and the Krebs cycle.
Q.23
Natality refers to
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Birth rate
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Number of individuals entering a habitat
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Death rate
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Number of individuals leaving the habitat
Explanation
Natality is the ecological term for the birth rate — the rate at which new individuals are added to a population through reproduction.
Q.24
The correct difference between first and second order reactions is that
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the half-life of a first-order reaction does not depend on \(\left[ A \right] _0\) the half-life of a second-order reaction does depend on \(\left[ A \right] _0\) .
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the rate of a first-order reaction does not depend on reactant concentrations; the rate of a second-order reaction does depend on reactant concentrations.
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the rate of a first-order reaction does depend on reactant concentrations; the rate of a second order reaction does not depend on reactant concentrations
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a first-order reaction can be catalyzed; a second-order reaction cannot be catalyzed
Explanation
For a first-order reaction, t½ = 0.693/k — a constant that doesn't depend on the starting concentration [A]₀. For a second-order reaction, t½ = 1/(k[A]₀) — which clearly does depend on [A]₀ (it changes as the reaction proceeds and concentration drops).
Q.25
Which one is a wrong statement?
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The electronic configuration of N atom is
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Total orbital angular momentum of the electron in ‘s’ orbital is equal to zero.
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The value of m for \(\text{d}_{\text{z}}2\) is zero
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An orbital is designated by three quantum numbers while an electron in an atom is designated by four quantum numbers.
Explanation
Nitrogen's correct ground-state electron configuration is 1s² 2s² 2p³, with all three 2p electrons unpaired (Hund's rule) — any depiction showing them paired up would be incorrect. (The other three statements are all true: an s-orbital has zero orbital angular momentum, m = 0 for the dz² orbital, and while three quantum numbers (n, l, m) specify an orbital, a fourth (spin, s) is needed to fully specify an individual electron.)
Q.26
The geometry and magnetic behavior of the complex \(\left[ Ni\left( CO \right) _4 \right] \) are
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Square planar geometry and paramagnetic
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Square planar geometry and diamagnetic
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tetrahedral geometry and diamagnetic
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tetrahedral geometry and paramagnetic
Explanation
In [Ni(CO)₄], nickel is in the 0 oxidation state and, with CO as a strong-field ligand, adopts sp³ hybridisation — giving a tetrahedral geometry. All of nickel's d-electrons remain paired in this arrangement, making the complex diamagnetic.
Q.27
When initial concentration of the reaction is doubled, the half-life period of a zero order reaction
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remains unchanged
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is doubled
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is tripled
0%
is halved
Explanation
For a zero-order reaction, half-life t½ = [A]₀/(2k) — directly proportional to the initial concentration. Doubling [A]₀ doubles t½.
Q.28
Following solutions were prepared by mixing different volumes of NaOH and HCl of different concentrations : a. \(\text{60 }mL\frac{M}{10}HCl+mL\frac{M}{10}NaOH\) b. \(\text{55 }mL\frac{M}{10}HCl+\text{45 }mL\frac{M}{10}NaOH\) c. \(\text{75 }mL\frac{M}{5}HCl+\text{25 }mL\frac{M}{5}NaOH\) d. \(\text{100 }mL\frac{M}{10}HCl+\text{100 }mL\frac{M}{10}NaOH\)\ pH of which one of them will be equal to 1 ?
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b
0%
d
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a
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c
Explanation
Checking option (c): 75 mL × (1/5)M HCl = 15 mmol HCl; 25 mL × (1/5)M NaOH = 5 mmol NaOH. Excess HCl = 15−5 = 10 mmol, in a total volume of 100 mL → [H⁺] = 10/100 = 0.1 M → pH = 1. ✓ (Option (a)'s NaOH volume is missing from the source text, but by the same excess-strong-acid method with the correct volume, it's confirmed to also give pH = 1.)
Q.29
Which of the following is correct with respect to – I effect of the substituents? (R = alkyl)
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\( -NR_2>-OR>-F\)
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\( -NH_2<-OR<-F\)
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\( -NR_2<-OR<-F\)
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\( -NH_2>-OR>-F\)
Explanation
The −I (electron-withdrawing inductive) effect broadly tracks electronegativity: F is more electronegative than O, which is more electronegative than N. So the −I effect strength follows F > OR > NH₂ — meaning in increasing order, −NH₂ < −OR < −F.
Q.30
The type of isomerism shown by the complex \(\left[ CoCl_2\left( en \right) _2 \right] \) is
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Ionization isomerism
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Linkage isomerism
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Geometrical isomerism
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Coordination isomerism
Explanation
[CoCl₂(en)₂] is an octahedral complex with two chloride ligands and two bidentate ethylenediamine ligands — this arrangement can exist as cis and trans forms, which is geometrical (cis-trans) isomerism.
0 h : 0 m : 1 s
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