Alkali metals show-

(1) Only +1 oxidation state

(2) Only –1 oxidation state

(3) +1 and +2 oxidation states

(4) –1 and –2 oxidation states.

Considering greater polarisation in LiCl compared to that in NaCl, which of the following statement is wrong –

(1) The m.p of LiCl is lower than that of NaCl

(2) LiCl dissolves more in organic solvent than NaCl

(3) LiCl will ionise in water more than NaCl

(4) Fused LiCl would be less conducing than fused NaCl

When heated in steam, Mg burns brilliantly producing-

(1) $Mg{\left(OH\right)}_2$                               

(2) $MgO and H_2$

(3) $MgO and O_2$                         

(4) $MgO and O_3$

A chloride dissolves appreciably in cold water. When placed in a platinum wire in Bunsen flame no distinctive colour is noticed. Which cation could be present –

(1) $B{e}^{2+}$                                         

(2) $B{a}^{2+}$

(3) $P{b}^{2+}$                                         

(4) $C{a}^{2+}$

The compounds of Ca are-

(1) Paramagnetic and colourless

(2) Paramagnetic and coloured

(3) Diamagnetic and coloured, provided their anions are also coloured

(4) Diamagnetic and colourless, provided their anions are also colourless

Calcium hydride can be obtained by heating : 

1. Calcium oxide with hydrogen.

2. Calcium oxide with hydrogen under pressure.

3. Calcium with hydrogen under pressure.

4. Calcium with hydrogen at a very low temperature.

Mark the incorrect statement:

(1) Alkali metals are strong reducing agents.

(2) The electropositive nature of alkali metals decreases with increase in atomic number.

(3) Alkali metals have relatively low electronegativity values.

(4) On burning in oxygen lithium forms only the monoxide while other alkali metals form peroxides and or superoxides.

A hydrated water soluble salt, A in solution gives a turbidity with dilute hydrochloric acid evolving a gas with a suffocation odour. The solution of A decolourises lodine solution. A is likely to be

1. KI                                         

2. $N{a}_{2}S{O}_4.10H_{2}O$

3. $N{a}_2{S}_2{O}_3.5H_{2}O$                   

4. $AgN{O}_3$

Which of the following compounds may be soluble in pyridine-

(1) Barium chloride                             

(2) Sodium chloride

(3) Lithium chloride                           

(4) Potassium chloride

Which of the following is a false statement-

(1) Sodium oxide is more basic then magnesium oxide.

(2) Beryllium oxide is amphoteric

(3) The thermal stability of beryllium carbonate is more than that of calcium carbonate

(4) Beryllium is amphoteric