1. There is a large increase in size on going from H atom (covalent
radius of 37 pm) to hydrido due to---- (a) interelectronic
addition when a second electron is added to the 1s orbital (b)
interelectronic repulsion when a second electron is added to the
1s orbital (c) interelectronic repulsion when a second electron is
added to the 2s orbital (d) interelectronic attraction when a
second electron is added to the 1s orbital
2. Hydrides of s-block metals are made by heating the metal in a
stream of hydrogen gas except--- (a) Na (b) Be (c) Al (d) B
3. Arrange in order of decreasing energies: X-D, D-D, X-H (a) X-
H>D-D>X-D (b) D-D>X-D>X-H (c) D-D<X-D<X-H (d) D-D>X-
D=X-H
4. The use of D2O as moderator in nuclear reactions is a result of -
--- (a) its lower cross-section for neutrino capture in fission
reaction without having to diminish neutron flux (b) its lower
cross-section for neutron capture in fusion without having to
diminish neutron flux (c) its lower cross-section for neutron
capture in fission reactions without having to diminish neutron
flux (d) its lower cross for proton capture in fission without
having to diminish neutron flux
5. The ionic nature of compounds of the formula E-H is such that
(a) E is more electronegative than H and as such, the H bears a
positive partial charge (b) E is more electronegative than H and
as such, the H bears a negative partial charge(c) E is less
electronegative than H and as such, the H bears a positive
partial charge(d) E is more electronegative than H and as such,
the H bears a negative partial charge
6. Which of the following is false about group 1 elements? (a)
Carnalite is KCl.MgCl2. 8H2O (b) Lithium has a diagonal
radius of 37 pm) to hydrido due to---- (a) interelectronic
addition when a second electron is added to the 1s orbital (b)
interelectronic repulsion when a second electron is added to the
1s orbital (c) interelectronic repulsion when a second electron is
added to the 2s orbital (d) interelectronic attraction when a
second electron is added to the 1s orbital
2. Hydrides of s-block metals are made by heating the metal in a
stream of hydrogen gas except--- (a) Na (b) Be (c) Al (d) B
3. Arrange in order of decreasing energies: X-D, D-D, X-H (a) X-
H>D-D>X-D (b) D-D>X-D>X-H (c) D-D<X-D<X-H (d) D-D>X-
D=X-H
4. The use of D2O as moderator in nuclear reactions is a result of -
--- (a) its lower cross-section for neutrino capture in fission
reaction without having to diminish neutron flux (b) its lower
cross-section for neutron capture in fusion without having to
diminish neutron flux (c) its lower cross-section for neutron
capture in fission reactions without having to diminish neutron
flux (d) its lower cross for proton capture in fission without
having to diminish neutron flux
5. The ionic nature of compounds of the formula E-H is such that
(a) E is more electronegative than H and as such, the H bears a
positive partial charge (b) E is more electronegative than H and
as such, the H bears a negative partial charge(c) E is less
electronegative than H and as such, the H bears a positive
partial charge(d) E is more electronegative than H and as such,
the H bears a negative partial charge
6. Which of the following is false about group 1 elements? (a)
Carnalite is KCl.MgCl2. 8H2O (b) Lithium has a diagonal
