Multiple Choice QuestionsA solution of sodium thiosulphate on addition of few drops of ferric chloride gives violet colour due to the formation of
Na2S4O6
Fe2(SO4)3
Fe2(S2O3)3
Fe2(S2O3)2
The chemical which is used for plastering the broken bones is
(CaSO4)2H2O
MgSO4·7H2O
FeSO4·7H2O
CuSO4·5H2O
Solution of sodium thiosulphate in photography works as
to shine film
to develop film
to dissolve silver bromide
to change negative into positive
Which of the following is an organometallic compound?
Lithium methoxide
Lithium acetate
Lithium dimethylamine
Methyl lithium
Arrange Na+, Mg+ and Al3+ in increasing order of energy of hydration.
Na+ < Mg+ < Al3+
Al3+< Mg+ < Na+
Al3+ < Na+ < Mg2+
Mg2+< Al3+ < Na+
Iron pipes, lying in acidic soil, are often attached to the blocks of magnesium for their protection from rusting, because magnesium
is lighter than iron
is readily converted into positive ion
forms a corrosion-resistant alloy with iron
prevents air from reaching the surface of iron
Which one of K, I, Cl and Li will display the highest first ionisation energy?
K
I
Cl
Li
C.
Cl
The ionisation energy increases on moving from left to right along a period, because with increase in atomic number in a period, effective nuclear charge increases and so, electrons are more tightly held. Whereas, on moving down a group, the valence shell becomes far away from the nucleus and thus, nuclear attraction towards valence electron decreases which results in-decrease in ionisation energy. Thus, chlorine has the highest first ionisation energy among all the given elements.
You may have noticed that chicken-egg is very strong along its long axis so much so that it does not break even when pressed very hard. Which of the following is the main constituent of egg-shell?
CaSO4·2H2O
CaSO4·1/2H2O
CaSiO3
CaCO3
The number of sodium atoms in 2 moles of sodium ferrocyanide is
12 × 1023
26 × 1023
34 × 1023
48 × 1023
Nuclear attraction is often the deciding control factor for the association of neutral molecules to a given metal ion. Which one of the following represents the correct order of stability of the ions?
[Be(H2O)4]2+, [Mg(H2O)4]2+, [Ca(H2O)4]2+ and [Sr(H2O)4]2+ ?
[Be(H2O)4]2+ > [Sr(H2O)4]2+> [Mg(H2O)4]2+ > [Ca(H2O)4]2+
[Ca(H2O)4]2+> [Mg(H2O)4]2+ > Be(H2O)4]2+ > [Sr(H2O)4]2+
[Sr(H2O)4]2+ > [Ca(H2O)4]2+> [Mg(H2O)4]2+ > Be(H2O)4]2+
[Be(H2O)4]2+> [Mg(H2O)4]2+ > [Ca(H2O)4]2+ > [Sr(H2O)4]2+
Switch
