Alkali metals in liquid NH₃ produce a blue coloured solution, due to-

1. Polarisability of NH₃

2. Charge transfer

3. d$\to$d transition

4. Ammoniated electrons

Correct order of solubility of Group l bicarbonate is 

1 RbHCO₃$>$KHCO₃$>$NaHCO₃

2 NaHCO₃ $>$KHCO₃ $>$RbHCO₃

3 LiHCO₃ = NaHCO₃ = KHCO₃ = RbHCO₃

4 All group l bicarbonates are insoluble

Strongest reducing agent in aqueous solution of Group l and colour imparted to flame by this element is

1 Cs, blue

2 Cs, red

3 Li, crimson red

4 Li, pink

An amphoteric oxide dissolves in HCl to form a salt. The salt does not impart any colour to the flame and fumes in moist air. The oxide is

1 CaO

2 Na₂O

3 BeO

4 MgO

Crude common salt is hygroscopic because of impurities of

1 CaBr₂ and MgBr₂

2 Ca(HCO₃)₂ and Mg(HCO₃)₂

3 CaSO₄ and MgSO₄

4 CaCl₂ and MgCl₂

Which is the correct order?

1 CsCl$>$KCl$>$NaCl$>$LiCl (ionic nature)

2 MgO$>$Al₂O₃$>$SO₃$>$Cl₂O₇ (Basic nature)

3 Cs$>$Rb$>$Na$>$K$>$Li (Density)

4 All of the above

Which of the following s-block element form oxide and nitride when treated with air?

1 K

2 Na

3 Mg

4 Rb

Which of the following can't exist?

1 LiCl.2H₂O

2 MgCl₂.6H₂O

3 [Al(H₂O)₆]³⁺

4 [BeF₆]^4-

Select the incorrect statement (s)

1 Li and Mg have widely different properties

2 NaHCO₃ and LiHCO₃ are solid compounds

3 Stability of hydrides follows the order LiH$>$NaH$>$KH

4 Both 1 & 2

Which of the following carbonate is sparingly soluble in water?

1 Li₂CO₃

2 Na₂CO₃

3 K₂CO₃

4 Rb₂CO₃