CBSE
Multiple Choice QuestionsA number of elements available in earth's crust but most abundant elements are
Al and Fe
Al and Cu
Fe and Cu
Cu and Ag
Choose the incorrect statement about noble gas?
Boiling point increases with increasing atomic mass
Helium has least tendency to form compound
Noble gases have some value of electron affinity
Xenon has maximum number of compounds
Identify the correct order of the size of the following:
Ca2+ < K+<Ar < S2- < Cl-
Ca2+ < K+ < Ar < Cl-< S2-
Ar < Ca2+ <K+ <Cl- <S2-
Ar < Ca2+ <K+ <Cl- <S2-
Beryllium differs in properties from other elements of its own group but shows resemblance with aluminium because of
relatively bigger ionic radius and high polarising power of Be
relatively smaller ionic radius and high polarising power of Be
relatively bigger ionic radius is the only reason behind this
None of the above
With which of the following electronic configuration an atom has the lowest ionisation enthalpy?
1s2 2s22p5
1s2 2s22p3
1s2 2s22p5 3s1
1s2 2s22p5 3s1
The element Z = 114 has been discovered recently. It will belong to which of the following family group and electronic configuration?
Halogen family, [Rn] 5f14 6d10 7s2 7p5
Carbon family, [Rn] 5f14 6d10 7s2 7p2
Oxygen family,[Rn] 5f14 6d10 7s2 7p4
Oxygen family,[Rn] 5f14 6d10 7s2 7p4
Consider the following sets of quantum numbers:
| n | l | m | s | |
| i) | 3 | 0 | 0 | +1/2 |
| ii) | 2 | 2 | 1 | +1/2 |
| iii) | 4 | 3 | -2 | -1/2 |
| iv) | 1 | 0 | -1 | -1/2 |
| v) | 3 | 2 | 3 | +1/2 |
ii, iii and iv
i, ii, iii and iv
ii, iv and v
ii, iv and v
Which of the following is correctly arranged in order of increasing weight?
0.0105 equivalent of H2CO2 ·2H2O < 0.625 g of Fe < 0.006 g atom of Ag <6.0 x 1021 atoms of Zn
0.625 g of Fe < 0.0105 equivalent of H2C2O4 ·2H2O < 6.0 x 1021 atoms of Zn < 0.006 g atom of Ag
0.625 g of Fe < 6.0 x 1021 atoms of Zn < 0.006 g atom of Ag < 0.0105 equivalent of H2C2O4 ·2H2O
0.0105 equivalent of H2C2O4. 2H2O < 0.006 g atom of Ag <6.0 x 1021 atoms of Zn < 0.625 g of Fe
Which of the following pair of metals is purified by van- Arkel method?
Zr and Ti
Ag and Au
Ni and Fe
Ga and In
A student made the following observations in the laboratory.
I. Clean copper metal did not react with 1 molar Pb(NO3)2 solution
II. Clean lead metal dissolved in a 1 molar AgNO3 solution and crystals of Ag metal appeared
III. Clean silver metal did not react with 1 molar Cu(NO3)2 solution
The order of decrease in reducing character of three metals is
Pb, Cu, Ag
Pb, Ag, Cu
Cu, Ag, Pb
Cu, Pb, Ag
