1.

Metal A has an electronic configuration of 2, 8, 1 and metal B has 2, 8, 8, 2 which is more reactive metal.(a) Identify A and B and give their reactions with dil HCL and dil H2SO4(b) Give the effect of heat on their:(i) oxides (ii) hydroxide (iii) carbonates (iv) nitrates

Answer»

Metal A is more reactive than Metal B.

(a) Metal A is Na (Sodium). Metal B is Ca (Calcium).

Reaction with HCl:

2Na + 2HCl 2NaCl + H2

Ca +2HCl CaCl2 + H2

Reaction with H2SO4 :

2Na + H2SO4 Na2SO4 + H4

Ca + H2SO4 CaSO4 + H2

(b)

(i) Oxides: Sodium and calcium oxides are stable to heat.

(ii) Hydroxides: Sodium hydroxide is stable to heat whereas calcium hydroxide decomposes on heating to metal oxide and water vapor.

(iii) Carbonates: Sodium carbonate is stable to heat whereas calcium carbonates decompose on heating to form calcium oxide and carbon dioxide.

(iv) Nitrates: Sodium nitrate on heating form nitrite and oxygen whereas calcium nitrate decomposes on heating to form calcium oxide, nitrogen dioxide and oxygen.



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