1). In which of the following pairs, the lons are isoelectronic
Na, MgO AL 0 0) Na",0 (v) , CI
(a) Only
(b) Both ) 6. 6)
I Both olj bs
laj Only i
2). Water gas is
(a) HO
(b) CO. HO
COH
(4) CO.N
3) Assertion Besos is soluble in water while Balls is not
Reason: Hydration energy decreases down the group from Be to Ba and lattice energ
remains almost constant
(a) both assertion and reason are true and reason to the correct explanation of
assertion
(b) both assertion and reason are true but reason is not the one
Assertion
(c) assertion is true but reason is false
(d) both assertion and reason are false
4). Heat of combustion is always
a) positive
b) negative
c) zero
d) either posu
equivalent
5) Carbon forms two ozides, namely carbon monoxide and carbon dio
mass of which element remains constant?
(a) Carbon
la) both carbon and oxygen
(b) oxygen
(d) neither carbon nor oxygen
Answers
Answered by
2
Answer:
(a) Combination reaction : Cao+CO
2
→CaCO
3
, in this reaction calcium oxide is combines with carbon dioxide to form calcium carbonate.
(b) Decomposition reaction : CaCO
3
→CaO+CO
2
, in this reaction calcium carbonate is decomposed to calcium oxide and carbon dioxide.
(c) Displacement reaction : Fe(s)+CuSO
4
(aq.)→FeSO
4
(aq)+Cu(s), in this reaction Fe displaces copper to form ferric sulphate.
(d) Analysis reaction : 2H
2
O→2H
2
+O
2
Hence, the correct option is C
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