Which of the following metal bicarbonates does not exist as solid?

1. LiHCO₃

2. KHCO₃

3. RbHCO₃

4. NaHCO₃

Which of the  following metal is most commonly used in photochemical cells?

1. Lithium

2. Calcium

3. Caesium

4. Fransium 

Which of the following is ‘dead burnt plaster’?

1. CaCO₃

2. CaSO₄ . 1/2H₂O

3. CaSO₄ . 2H₂O

4. CaSO₄

Which of the following substances can be used for drying gas?

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