Q.1
The contraceptive ‘SAHELI’
  • is a post-coital contraceptive.
  • is an IUD.
  • increases the concentration of estrogen and prevents ovulation in females
  • blocks estrogen receptors in the uterus, preventing eggs from getting implanted.
Q.2
Select the wrong statement :
  • Mitochondria are the powerhouse of the cell in all kingdoms except Monera
  • Mushrooms belong to Basidiomycetes
  • Cell wall is present in members of Fungi and Plantae
  • Pseudopodia are locomotory and feeding structures in Sporozoans
Q.3
Iron carbonyl, \(\text{Fe(CO)}_5\) is
  • monomuclear
  • dinuclear
  • tetranuclear
  • trinnuclear
Q.4
Consider the change in the oxidation state of Bromine corresponding to different emf values as shown in the diagram below :
neet2018-81.png
  • \( HBrO\)
  • \( Bro_{3}^{-}\)
  • \( Bro_{4}^{-}\)
  • \( Br_2\)
Q.5
The correction factor ‘a’ to the ideal gas equation corresponds to
  • the volume of the gas molecules
  • Forces of attraction between the gas molecules
  • the density of the gas molecules
  • electric field present between the gas molecules
Q.6
Which of the following statements is not true for halogens?
  • Chlorine has the highest electron-gain enthalpy
  • All but fluorine show positive oxidation states.
  • All are oxidizing agents.
  • All form monobasic oxyacids
Q.7
The correct difference between first and second order reactions is that
  • 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 \(\left[ A \right] _0\) .
  • 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.
  • 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
  • a first-order reaction can be catalyzed; a second-order reaction cannot be catalyzed
Q.8
Which one is a wrong statement?
  • The electronic configuration of N atom is
  • Total orbital angular momentum of the electron in ‘s’ orbital is equal to zero.
  • The value of m for \(\text{d}_{\text{z}}2\) is zero
  • An orbital is designated by three quantum numbers while an electron in an atom is designated by four quantum numbers.
Q.9
The geometry and magnetic behavior of the complex \(\left[ Ni\left( CO \right) _4 \right] \) are
  • Square planar geometry and paramagnetic
  • Square planar geometry and diamagnetic
  • tetrahedral geometry and diamagnetic
  • tetrahedral geometry and paramagnetic
Q.10
When initial concentration of the reaction is doubled, the half-life period of a zero order reaction
  • remains unchanged
  • is doubled
  • is tripled
  • is halved
Q.11
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 ?
  • b
  • d
  • a
  • c
Q.12
Which of the following is correct with respect to – I effect of the substituents? (R = alkyl)
  • \( -NR_2>-OR>-F\)
  • \( -NH_2<-OR<-F\)
  • \( -NR_2<-OR<-F\)
  • \( -NH_2>-OR>-F\)
Q.13
The type of isomerism shown by the complex \(\left[ CoCl_2\left( en \right) _2 \right] \) is
  • Ionization isomerism
  • Linkage isomerism
  • Geometrical isomerism
  • Coordination isomerism
Q.14
The compound \(C_7H_8\) undergoes the following reactions : \[C_7H_8\xrightarrow{3Cl_2/\Delta}A\xrightarrow{Br_2/Fe}B\xrightarrow{Zn/HCl}C\] The product ‘C’ is
  • o-bromotoluene
  • m-bromotoluene
  • 3-bromo-2, 4, 6,-trichlorotoluene
  • p-bromotoluene
Q.15
Match the metal ions given in Column I with the spin magnetic moments of the ions given in Column II and assign the correct code :
neet2018-69.png
  • a--iv b--i c--ii d--iii
  • a--iii b--v c--i d--ii
  • a--i b--ii c--iii d--iv
  • a--iv b--v c--ii d--i
Q.16
Which of the following molecules represents the order of hybridization \(\text{sp}^2,\text{sp}^2,\text{sp,sp}\) from left to right atoms?
  • \( CH_2=CH-C\equiv CH\)
  • \( CH_2=CH-CH=CH_2\)
  • \( HC\,\equiv C-C\equiv CH\)
  • \( CH_3-CH=CH-CH_{_3}\)
Q.17
In which case is the number of molecules of water maximum?
  • 0.00224 L of water vapors at 1 atm and 273 K
  • 18 mL of water
  • \(10^{-3}\) mol of water
  • 0.18 g of water
Q.18
On which of the following properties does the coagulating power of an ion depend?
  • The magnitude of the charge on the ion alone
  • The sign of charge on the ion alone
  • Both magnitude and sign of the charge on the ion
  • Size of the ion alone
Q.19
Hydrocarbon (A) reacts with bromine by substitution to form an alkyl bromide which by Wurtz reaction is converted to gaseous hydrocarbon containing less than four carbon atoms. (A) is
  • \(CH_3=CH_3\)
  • \(CH\equiv CH\)
  • \(CH_2=CH_2\)
  • \(CH_4\)
Q.20
Nitration of aniline in strong acidic medium also gives m-nitroaniline because
  • In acidic (strong) medium aniline is present as anilinium ion.
  • In absence of substituents nitro group always goes to m-position
  • In electrophilic substitution reactions amino group is meta directive.
  • In spite of substituents nitro group always goes to only m-position.
Q.21
Which one of the following conditions will favor maximum formation of the product in the reaction, \[A_2\left( g \right) +B_2\left( g \right) \rightleftharpoons X_2\left( g \right) \Delta _rH=-X\,\,kJ\]
  • High temperature and high pressure
  • High temperature and Low pressure
  • Low temperature and high pressure
  • Low temperature and low pressure
Q.22
Among \(CaH_2, BeH_2, BaH_2,\) the order of ionic character is
  • \(BeH_2
  • \(CaH_2
  • \(BaH_2
  • \(BeH_2
Q.23
The bond dissociation energies of \(X_2,Y_2\) and XY are in the ratio of \(1:05 :1\). \(\Delta H\) for the formation of XY is \(-200 kJ mol^{-1}\) The bond dissociation energy of \(X_2\) will be
  • \(100 kJ mol^{-1}\)
  • \(800 kJ mol^{-1}\)
  • \(200 kJ mol^{-1}\)
  • \(400 kJ mol^{-1}\)
Q.24
The correct order of N-compounds in its decreasing order of oxidation states is
  • \(HNO_3,NH_4Cl,NO,N_2\)
  • \(NH_4Cl,N_2,NO,HNO_3\)
  • \(HNO_3,NO,NH_4Cl,N_2\)
  • \(HNO_3,NO,N_2,NH_4Cl\)
Q.25
Carboxylic acids have higher boiling points than aldehydes, ketones and even alcohols of comparable molecular mass. It is due to their
  • formation of intermolecular H-bonding
  • formation of intramolecular H-bonding
  • formation of carboxylate ion
  • more extensive association of carboxylic acid via van der Waals force of attraction
Q.26
Given van der wails’ constant for \(NH_3, H_2, O_2, CO_2\) are respectively 4.17, 0.244, 1.36 and 3.59, which one of the following gases is most easily liquefied?
  • \(H_2\)
  • \(NH_3\)
  • \(CO_2\)
  • \(O_2\)
Q.27
Which one of the following ions exhibits d-d transition and paramagnetism as well?
  • \( Cr_2O_{7}^{2-}\)
  • \( CrO_{4}^{2-}\)
  • \( MnO_{4}^{-}\)
  • \( MnO_{4}^{2-}\)
Q.28
The solubility of \(BaSO_4\) in water is \(2.42 \times 10^{-3}gL^{-1}\) at 298 K. The value of its solubility product \( \left ( K_{sp} \right ) \) will be (Given molar mass of \(BaSO_4 = 233 g.mol^{-1}\)
  • \(1.08\times \,\,10^{-14}mol^2L^{-2}\)
  • \(1.08\times 10^{-10}mol^2L^{-2}\)
  • \(1.08\times 10^{-8}mol^2L^{-2}\)
  • \(1.08\times 10^{-12}mol^2L^{-2}\)
Q.29
In the reaction The electrophile involved is
neet2018-66.png
  • dichloromethyl anion
  • dichlorocarbene
  • formyl cation
  • dichloromethyl cation
Q.30
Considering Ellingham diagram, which of the following metals can be used to reduce alumina?
  • Fe
  • Zn
  • Cu
  • Mg
0 h : 0 m : 1 s