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Chemistry - 9 Chapter - 2
Chemical combination and Chemical Equations
Test - 1
1.
The equation AgNO
3
(aq) + NaCl(aq)------------------------> AgCl(s) + NaNO
3
(aq) represents:
a) Double displacement reaction
b) Addition reaction
c) Displacement reaction
d) Decomposition reaction
2.
The molecular mass of CO
2
is
a) 43
b) 42
c) 40
d) 44
3.
The formula of acetate is
a) CH
3
COOH
b) C
2
H
5
COOH
c) CH
3
COO-
d) C
2
H
5
COO-
4.
The empirical formula of benzene and acetylene is same and that is:
a) C
2
H
2
b) CH
c) C
2
H
4
d) C
2
H
6
5.
NO
2
-1
is the formula of:
a) Nitrous Oxide
b) Nitrate
c) Nitric Oxide
d) Nitrite
6.
28 grams of carbon monoxide contains:
a) 6.02x10^23 radicals
b) 6.02x10^23 atoms
c) 6.02x10^23 molecules ( ^ for raise to the power )
d) 6.02x10^23 ions
7.
The molar mass of ammonia
a) 3g
b) 17g
c) 21g
d) 10g
8.
1 mole of CaCO
3
is equal to:
a) 40g
b) 60g
c) 5g
d) 100g
9.
C
2
H
2
O
4
represents
a) Acetic acid
b) None of the above
c) Oxalic acid
d) Carbonic acid
10.
The variable valencies of iron are
a) 2 and 4
b) 2,4 and 6
c) 2 and 3
d) 1 and 2
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