Because of lanthanoid contraction, which of the following pairs of elements have nearly same atomic radii? ( Numbers in the parenthesis are atomic numbers)
27%
a) Ti22 and Zr40
27%
b) Zr40 and Nb41
45%
c) Zr40 and Hf72
0%
d) Zr40 and Ta73
Q.2.
The compound which gives oxygen on moderate heating is
22%
a) Zinc oxide
22%
b) Mercuric oxide
22%
c) Aluminium oxide
33%
d) Ferric oxide
Q.3.
Silver, mercury and lead have been placed in same group of qualitative analysis, because they form ... ..
33%
a) carbonates soluble in dilute HNO3
22%
b) nitrate
44%
c) insoluble chlorides
0%
d) same type of coloured compounds
Q.4.
Maximum oxidation state is presented by … [ IIT 2004]
11%
a) CrO2Cl2 and MnO4-
44%
b) MnO2
44%
c) [Fe(CN)6]3- and [Co(CN)6]3-
0%
d) MnO
Q.5.
Assertion : Fe3O4 is paramagnetic at room temperature and become ferromagnetic at 850K Reason : The randomization of spin takes place with temperature
75%
a) Assertion and Reason both are correct and Reason is correct explanation to Assertion
12%
b) Assertion and Reason both are correct and Reason is not correct explanation to Assertion
0%
c) Assertion is correct but reason is wrong
12%
d) Assertion is wrong but reason is correct
Q.6.
Lithopone, a white pigment, consists of ....
33%
a) Al2O3 and CaCO3
0%
b) BaS and PbSO4
67%
c) ZnS and BaSO4
0%
d) PbS and MnO
Q.7.
The compound widely used in making reference electrode is
0%
a) ZnCl2
38%
b) CuSO4
50%
c) Hg2Cl2
12%
d) HgCl
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]
43%
a) Estimating the concentration of iron
14%
b) Measuring the concentration of CN-
43%
c) Measuring the solid state magnetic moment
0%
d) Thermally decomposing the compound
Q.9.
What effect is noticed on shaking dilute sulphuric acid with a small quantity of anhydrous copper sulphate?
25%
a) The white solid dissolves to form a colourless solution
12%
b) The white solid dissolves to form a green solution
12%
c) The white solid turns blue but does not dissolve
50%
d) The white solid dissolves to form a blue solution
Q.10.
Which of the following pairs has the same
12%
a) Fe2+, Ni2+
0%
b) Zr4+, Ti4+
38%
c) Zr4+, Hf4+
50%
d) Zn2+, Hf i4+
Q.11.
Which one of the following statements is correct when SO2 is passed through acidified K2Cr2O7 solution? [ NEET 2016]
12%
a) The solution is decolorized
25%
b) SO2 is reduced
62%
c) Green Cr2(SO4)3 is formed
0%
d) The solution turns blue
Q.12.
A compound is yellow when hot and white when cold, The compound is ...
11%
a) Al2O3
67%
b) PbO
0%
c) CaO
22%
d) ZnO
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)
0%
a) [Fe(H2O)6]2+
43%
b) [Co(H2O)6]2+
29%
c) [Cr(H2O)6]2+
29%
d) [Mn(H2O)6]2+
Q.14.
Which metal cation forms stronger complex salt?
30%
a) Zn2+
10%
b) Cd2+
30%
c) Hg2+
30%
d) All of same strength
Q.15.
Mercury forms amalgams with all except [ PET 1991]
22%
a) Al
33%
b) Zn
33%
c) Ni
11%
d) Fe
Q.16.
Steel that is resistant to acids is ... ..
44%
a) Fe
11%
b) Cu
44%
c) Ag
0%
d) Zn
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)
50%
a) Fe > Mn > Co > Cr
12%
b) Co > Mn > Fe > Cr
12%
c) Cr > Mn > Co > Fe
25%
d) Mn > Fe > Cr > Co
Q.18.
On heating ZnCl2 . H2 O the compound obtained is ... ..
22%
a) ZnCl2
22%
b) Zn(OH)Cl
11%
c) Zn(OH)2
44%
d) ZnO
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]
30%
a) FeSO4
10%
b) FeSO3
40%
c) FeC2O4
20%
d) Fe(NO2)2
Q.20.
Identify the incorrect statement among the following …[ AIEEE 2007]
11%
a) 4f and 5f-orbitals are equally shielded
22%
b) d-block elements show irregular trend and erratic chemical properties among themselves
56%
c) La and Lu have partially filled d-orbitals and no other partially filled orbitals
11%
d) The chemistry of various lanthanoids is very similar
Q.21.
The lanthanoid contraction relates to
25%
a) Atomic radii
12%
b) Atomic as well as M3+ radii
38%
c) Valence electrons
25%
d) Oxidation states
Q.22.
Which of the following ions will exhibit colour in aqueous solutions? [ AIPMT 2010]
14%
a) La3+ (Z=57)
43%
b) Ti3+ (Z=22)
29%
c) Lu3+ (Z=71)
14%
d) Sc3+ (Z=21)
Q.23.
The flux used in soldering is
14%
a) HgO
43%
b) ZnO
14%
c) CdO
29%
d) None of these
Q.24.
The substance that sublimes on heating is …
14%
a) MgCl2
14%
b) AgCl
71%
c) HgCl2
0%
d) NaCl
Q.25.
Which one of the following ions has electronic configuration [Ar]3d6? [ AIPMT 2010]
0%
a) Ni3+
25%
b) Mn3+
38%
c) Fe3+
38%
d) Co3+
Q.26.
Reason of lanthanoid contraction is …[ AIPMT 2014]
20%
a) Negligible screening effect of f-orbitals
20%
b) Increasing nuclear change
10%
c) Decreasing nuclear charge
50%
d) Decreasing screening effect
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