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NEET Chemistry MCQ
D- And F- Block Elements Mcq Neet Chemistry
Quiz 8
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Q.1
Because of lanthanoid contraction, which of the following pairs of elements have nearly same atomic radii? ( Numbers in the parenthesis are atomic numbers)
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a) Ti22 and Zr40
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b) Zr40 and Nb41
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c) Zr40 and Hf72
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d) Zr40 and Ta73
Explanation
Answer: (c)
Q.2
The compound which gives oxygen on moderate heating is
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a) Zinc oxide
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b) Mercuric oxide
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c) Aluminium oxide
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d) Ferric oxide
Explanation
Answer: (b)
Q.3
Silver, mercury and lead have been placed in same group of qualitative analysis, because they form ... ..
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a) carbonates soluble in dilute HNO3
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b) nitrate
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c) insoluble chlorides
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d) same type of coloured compounds
Explanation
Answer: (c)
Q.4
Maximum oxidation state is presented by … [ IIT 2004]
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a) CrO2Cl2 and MnO4-
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b) MnO2
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c) [Fe(CN)6]3- and [Co(CN)6]3-
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d) MnO
Explanation
Answer: (a)
Q.5
Assertion : Fe3O4 is paramagnetic at room temperature and become ferromagnetic at 850K Reason : The randomization of spin takes place with temperature
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a) Assertion and Reason both are correct and Reason is correct explanation to Assertion
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b) Assertion and Reason both are correct and Reason is not correct explanation to Assertion
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c) Assertion is correct but reason is wrong
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d) Assertion is wrong but reason is correct
Explanation
Answer: (d)
Q.6
Lithopone, a white pigment, consists of ....
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a) Al2O3 and CaCO3
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b) BaS and PbSO4
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c) ZnS and BaSO4
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d) PbS and MnO
Explanation
Answer: (c)
Q.7
The compound widely used in making reference electrode is
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a) ZnCl2
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b) CuSO4
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c) Hg2Cl2
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d) HgCl
Explanation
Answer: (c)
Q.8
In nitroprusside ion, the iron and NO exist as FeII and NO+ rather than FeIII and NO. These forms can be differentiated by …[ IIT 1998]
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a) Estimating the concentration of iron
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b) Measuring the concentration of CN-
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c) Measuring the solid state magnetic moment
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d) Thermally decomposing the compound
Explanation
Answer: (c)
Q.9
What effect is noticed on shaking dilute sulphuric acid with a small quantity of anhydrous copper sulphate?
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a) The white solid dissolves to form a colourless solution
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b) The white solid dissolves to form a green solution
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c) The white solid turns blue but does not dissolve
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d) The white solid dissolves to form a blue solution
Explanation
Answer: (d)
Q.10
Which of the following pairs has the same
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a) Fe2+, Ni2+
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b) Zr4+, Ti4+
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c) Zr4+, Hf4+
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d) Zn2+, Hf i4+
Explanation
Answer: (c)
Q.11
Which one of the following statements is correct when SO2 is passed through acidified K2Cr2O7 solution? [ NEET 2016]
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a) The solution is decolorized
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b) SO2 is reduced
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c) Green Cr2(SO4)3 is formed
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d) The solution turns blue
Explanation
Answer: (c)
Q.12
A compound is yellow when hot and white when cold, The compound is ...
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a) Al2O3
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b) PbO
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c) CaO
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d) ZnO
Explanation
Answer: (d)
Q.13
The d-electron configuration of Cr2+, Mn2+, Fe2+ and Co2+ are d4, d5, d6 and d7 respectively. Which one of the following will exhibit minimum paramagnetic behavior? [ AIPMT 2011] ( At.no. Cr=24, Mn=25, Fe=26, Co=27)
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a) [Fe(H2O)6]2+
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b) [Co(H2O)6]2+
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c) [Cr(H2O)6]2+
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d) [Mn(H2O)6]2+
Explanation
Answer: (b)
Q.14
Which metal cation forms stronger complex salt?
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a) Zn2+
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b) Cd2+
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c) Hg2+
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d) All of same strength
Explanation
Answer: (c)
Q.15
Mercury forms amalgams with all except [ PET 1991]
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a) Al
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b) Zn
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c) Ni
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d) Fe
Explanation
Answer: (d)
Q.16
Steel that is resistant to acids is ... ..
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a) Fe
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b) Cu
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c) Ag
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d) Zn
Explanation
Answer: (a)
Q.17
For the four successive transition elements (Cr, Mn, Fe and Co), the stability of +2 oxidation state will be there in which of the following order? ( At.no. Cr=24, Mn=25, Fe=26, Co=27)
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a) Fe > Mn > Co > Cr
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b) Co > Mn > Fe > Cr
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c) Cr > Mn > Co > Fe
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d) Mn > Fe > Cr > Co
Explanation
Answer: (d)
Q.18
On heating ZnCl2 . H2 O the compound obtained is ... ..
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a) ZnCl2
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b) Zn(OH)Cl
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c) Zn(OH)2
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d) ZnO
Explanation
Answer: (b)
Q.19
Assuming complete ionization, same moles of which of the following compounds will require the least amount of acidified KMnO4 for complete oxidation? [ AIMPT 2015]
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a) FeSO4
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b) FeSO3
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c) FeC2O4
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d) Fe(NO2)2
Explanation
Answer: (a)
Q.20
Identify the incorrect statement among the following …[ AIEEE 2007]
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a) 4f and 5f-orbitals are equally shielded
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b) d-block elements show irregular trend and erratic chemical properties among themselves
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c) La and Lu have partially filled d-orbitals and no other partially filled orbitals
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d) The chemistry of various lanthanoids is very similar
Explanation
Answer: (a)
Q.21
The lanthanoid contraction relates to
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a) Atomic radii
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b) Atomic as well as M3+ radii
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c) Valence electrons
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d) Oxidation states
Explanation
Answer: (b)
Q.22
Which of the following ions will exhibit colour in aqueous solutions? [ AIPMT 2010]
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a) La3+ (Z=57)
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b) Ti3+ (Z=22)
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c) Lu3+ (Z=71)
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d) Sc3+ (Z=21)
Explanation
Answer: (b)
Q.23
The flux used in soldering is
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a) HgO
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b) ZnO
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c) CdO
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d) None of these
Explanation
Answer: (c)
Q.24
The substance that sublimes on heating is …
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a) MgCl2
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b) AgCl
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c) HgCl2
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d) NaCl
Explanation
Answer: (c)
Q.25
Which one of the following ions has electronic configuration [Ar]3d6? [ AIPMT 2010]
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a) Ni3+
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b) Mn3+
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c) Fe3+
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d) Co3+
Explanation
Answer: (d)
Q.26
Reason of lanthanoid contraction is …[ AIPMT 2014]
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a) Negligible screening effect of f-orbitals
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b) Increasing nuclear change
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c) Decreasing nuclear charge
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d) Decreasing screening effect
Explanation
Answer: (a)
0 h : 0 m : 1 s
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