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NEET Chemistry MCQ
D- And F- Block Elements Mcq Neet Chemistry
Quiz 4
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Q.1
While extracting an element from its ore, the ore is grind and leached with dil. KCN solution to form the soluble product potassium argento-cyanide. The element is …[ AIPMT 1989]
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a) Lead
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b) Chromium
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c) Manganese
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d) Silver
Explanation
Answer: (d)
Q.2
The solubility of silver bromide in hypo solution is due to the formation of ..
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a) Ag2SO3
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b) Ag2S2O3
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c) [Ag(S2O3 )]-
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d) [Ag(S2O3 )2]3-
Explanation
Answer: (d)
Q.3
Why do theoritical value of magnetic moment differ from their practical value ?
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a) Due to decrease in volume of metal ion.
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b) Due to unsymmetrical arrangement of dipoles in orbital.
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c) Due to rotation-orbital combination.
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d) Both are different methods to calculate magnetic moment.
Explanation
Answer: (c)
Q.4
Amalgams are
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a) Always solid
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b) Highly coloured alloys
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c) Alloys which contain mercury as one of the contents
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d) Compounds of mercury
Explanation
Answer: (c)
Q.5
The electronic configuration of actinoids can not be assigned with degree of certainty because of
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a) Small energy difference between 5f and 6d-levels
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b) Overlapping of inner orbitals
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c) Free movement of electrons over all the orbitals
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d) None of the above
Explanation
Answer: (a)
Q.6
Among the following series of transition metal ions, the one in which all metal ions have 3d2 electronic configuration is ..(At.no, Ti=22, V=13, Cr=24, Mn=25) [ AIPMT 2004]
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a) Ti3+, V2+, Cr3+, Mn4+
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b) Ti+, V4+, Cr6+, Mn7+
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c) Ti4+, V3+, Cr2+, Mn3+
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d) Ti2+, V3+, Cr4+, Mn5+
Explanation
Answer: (d)
Q.7
The highest magnetic moment is shown by the transition metal ion with the outer electronic configuration ..[ PET 1993]
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a) 3d2
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b) 3d5
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c) 3d7
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d) 3d9
Explanation
Answer: (b)
Q.8
Which is formed when iron reacts with carbon?
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a) FeC2
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b) Fe3C
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c) FeC3
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d) Fe2C
Explanation
Answer: (b)
Q.9
Which one of the following statements related to lanthanons is incorrect? [ NEET 2016]
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a) Europium shows +2 oxidation state
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b) The basicity decreases as the ionic radius decreases from Pr to Lu
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c) All the lanthanons are much more reactive than aluminium
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d) Ce(+4) solution are widely used as oxidizing agent in volumetric analysis
Explanation
Answer: (c)
Q.10
Transition elements are coloured due to ... ..
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a) Small size
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b) Metallic nature
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c) unpaired d-electrons
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d) None of these
Explanation
Answer: (c)
Q.11
In aqueous solution, Eu2+ acts as
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a) An oxidizing agent
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b) Reducing agent
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c) Can act as either of these
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d) Can act as redox agent
Explanation
Answer: (b)
Q.12
In which of the following pairs are both the ions coloured in aqueous solution? ( At no Sc=21, Ti=22, Ni=28, Cu=29) [AIPMT 2006]
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a) Ni2+, Ti2+
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b) Sc3+, Ti3+
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c) Sc3+, Co2+
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d) Ni2+, Cu+
Explanation
Answer: (a)
Q.13
Which compound cannot be prepared?
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a) Zn(OH)2
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b) Cd(OH)2
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c) Hg(OH)2
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d) HgCl2
Explanation
Answer: (c)
Q.14
Match column-A and column-B properly.
Brass
a. Ni (60%) Cr (40%)
Bronze
b. Cu (80%) Sn (20%)
Cupronicle
c. Cu (90%) Sn (10%)
Nichrome
d. Cu (70%) Zn (30%)
-- --
e. Cu (75-85%) NI (25-15%)
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a) 1 → d; 2 → c; 3 → e; 4 → a
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b) 1 → d; 2 → c; 3 → e; 4 → b
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c) 1 → d; 2 → e; 3 → a; 4 → b
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d) 1 → e; 2 → c; 3 → a; 4 → d
Explanation
Answer: (a)
Q.15
Nessler’s reachent is …[ PET 1993]
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a) KHgI4
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b) K2HgI4
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c) K2HgI4 + NaOH
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d) KHgI4 + NaOH
Explanation
Answer: (c)
Q.16
The properties of Zr and Hf are similar because ... ..
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a) both belong to d-blck
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b) both belong to same group of the periiodic table
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c) both have similar radiii
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d) both have same number of electrons
Explanation
Answer: (c)
Q.17
The reduction of aqueous KMnO4 with H2O2 in acidic conditions gives [ AIPMT 2014]
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a) Mn4+ and O2
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b) Mn2+ and O2
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c) Mn2+ and O3
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d) Mn4+ and MnO2
Explanation
Answer: (b)
Q.18
On which factor, does the stability of an oxidation state in lanthanide elements depend ? [Gujarat-2008]
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a) Combined effect of hyadration energy and ionization energy.
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b) Electronic configuration
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c) Enthalpy
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d) Internal energy
Explanation
Answer: (a)
Q.19
Which ore contains both iron and copper? [ IIT 2005]
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a) Cuprite
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b) Chalcocite
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c) Chalcopyrite
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d) Malachite
Explanation
Answer: (c)
Q.20
Nitriding is the process of surface hardening of steel by treating it in an atmosphere of ..[ AIPMT 1989]
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a) NH3
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b) N2
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c) O3
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d) H2S
Explanation
Answer: (a)
Q.21
A element having atomic no. 56 is included in [AFMC-2003]
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a) Lanthanides
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b) Actindies
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c) Alkaline earth metals
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d) None of above
Explanation
Answer: (c)
Q.22
The correct order of ionic radii of Y3+, La3+, Eu3+ and Lu3+ ( At.no. Y=39, La=57, Eu = 63, Lu=71) [ AIPMT 2003]
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a) Lu3+ < Eu3+ < La3+ < Y3+
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b) La3+ < Eu3+ < Lu3+ < Y3+
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c) Y3+ < La3+ < Eu3+ < Y3+
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d) Y3+ < Lu3+ < Eu3+ < La3+
Explanation
Answer: (d)
Q.23
Which of following statement is correct for transition elements ? [AFMC - 2002]
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a) They are very active.
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b) They show variable valencies.
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c) They show lower melting point.
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d) They are stong electropositive elements.
Explanation
Answer: (b)
Q.24
Which one of the following ionic species will impart colour to an aqueous solution? [ AIPMT 1998]
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a) Ti4+
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b) Cu+
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c) Zn2+
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d) Cr3+
Explanation
Answer: (d)
Q.25
A blue colouration is not obtained when …
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a) Ammonium hydroxide dissolves in copper sulphate
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b) Copper sulphate solution reacts with K4[Fe(CN)6]
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c) Ferric chloride reacts with sodium ferrocyanide
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d) Anhydrous white CuSo4 is dissolved in water
Explanation
Answer: (b)
Q.26
In the electrolytic purification of copper some gold is found in the …
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a) Cathode
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b) Cathode mud
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c) Anode mud
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d) None of these
Explanation
Answer: (c)
Q.27
Which of the following is amphoteric oxide? [ AIEEE 2003]
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a) SO2
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b) B2O3
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c) ZnO
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d) Na2O
Explanation
Answer: (c)
Q.28
Ferric oxide in furnace is reduced by …
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a) C
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b) H2
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c) CO
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d) CO2
Explanation
Answer: (c)
Q.29
Which statement about group 12 elements is wrong? [ PET 1991]
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a) Zinc forms an alloy with copper
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b) Zn22+ is stable
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c) Mercury gives compounds with +1 and 2+ valencies
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d) Hg is liquid element
Explanation
Answer: (b)
Q.30
Zinc white is a better white pigment than lead white because it …
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a) Has more covering power than lead white
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b) Is not blackened by the action of H2S
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c) Is soluble in water
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d) Becomes yellow when heated
Explanation
Answer: (b)
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