1.
|
In the conversion of
X is
(A) H2/Pt
(B) Zn-Hg/HCl
(C) Li/NH3
(D) NaBH4
|
Answer: (D)
|
2.
|
In the conversion
of Br2 to
 ,
the oxidation number of Br changes from
(A) zero
to +5
(B) +1
to +5
(C) zero
to -3
(D) +2
to +5
|
Answer: (A)
|
3.
|
In the
following electron – dot structure, calculate the formal charge from left to
right nitrogen atom;
(A) –1,
–1, +1
(B) –1,
+1, –1
(C) +1,
–1, –1
(D) +1,
–1, +1
|
Answer: (B)
|
4.
|
In the
following, the element with the highest ionisation energy is
(A) [Ne]3s23p1
(B) [Ne]3s23p3
(C) [Ne]3s23p2
(D) [Ne]3s23p4
|
Answer: (B)
|
5.
|
In the reaction
R - X
the product B
is
(A) alkyl
chloride
(B) aldehyde
(C) carboxylic
acid
(D) ketone
|
Answer: (C)
|
6.
|
In the reaction
2H2O2 ® 2H2O + O2
(A) Oxygen is oxidised only
(B) Oxygen is reduced only
(C) Oxygen is neither oxidised nor reduced
(D) Oxygen is both oxidised and reduced
|
Answer: (D)
|
7.
|
In Tollen's test, aldehydes
(A) Are oxidised to acids
(B) Are reduced to alcohol
(C) Neither reduced nor oxidised
(D) Precipitate Ag+ as AgCI
|
Answer: (A)
|
8.
|
In which of
the following complex ion, the central metal ion is in a state of sp3d2 hybridisation?
(A) [CoF6]3-
(B) [Co(NH3)6]3+
(C) [Fe(CN)6]3-
(D) [Cr
(NH3)6]3+
|
Answer: (A)
|
9.
|
In which one
of the given formulae of xenon compounds there are five a-bonds and three p-bonds in it?
(A) XeFO
(B) XeF2O2
(C) XeF3O2
(D) XeF2O3
|
Answer: (D)
|
10.
|
Increasing order of
carbon-carbon bond length for the following is
C2H4 C2H2
C6H6 C2H6
(A) (B) (C) (D)
(A) C < B < A < D
(B) B < C < A < D
(C) D < C < A < B
(D) B < A < C < D
|
Answer: (D)
|
11.
|
Inductive
effect involves
(A) displacement
of s electrons
(B) delocalisation
of p electrons
(C) delocalisation
of s electrons
(D) displacement
of p electrons
|
Answer: (A)
|
12.
|
Insulin
regulates the metabolism of
(A) minerals
(B) amino
acids
(C) glucose
(D) vitamins
|
Answer: (C)
|
13.
|
Liquor ammonia
bottles are opened only after cooling. This is because
(A) it
is a mild explosive
(B) it
is a corrosive liquid
(C) it
is a lachrymatory
(D) it
generates high vapour pressure
|
Answer: (D)
|
14.
|
Lowest pKa is
associated with
 |
Answer: (C)
|
15.
|
Maximum
efficiency of a commercial refrigerator which operates between –10° (inside
temperature) and 25°C (outside temperature) is
(A) 13.3%
(B) 11.45%
(C) 24.75%
(D) 20%
|
Answer: (B)
|
Chemistry mcq with answers
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