CTET Solved Paper MCQ - UPTET October 2017 Paper2

61 Which of the following has maximum number of atoms?

A
16g of N₂
B
16g of CO₂
C
16g of CH₄
D
16g of O₂

View Explanation
Comment

The number of atoms

62 In laboratory, ethylene and acetylene can be distinguished by

A
Br₂/H₂0
B
KMn0₄ / OH^- / H₂O
C
Tollens'reagent
D
Fehling solution

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Comment

In laboratory, ethylene and acetylene can be distinguished by Tollen's reagent. Tollen's reagent is ammoniacal silver nitrate (2Ag(NH₃)₂OH).

63 In which of the following compounds, the oxidation number of oxygen is + 2?

A
OF₂
B
Na₂O
C
NaO₂
D
NaO₃

View Explanation
Comment

Let the oxidation no. of oxygen be x in OF₂
x + 2(-1) = 0
x - 2 = 0
x = +2
Thus, the oxidation number of oxygen is +2 in OF₂

64 The monomer of natural rubber is

A
Neoprene
B
Isoprene
C
Terylene
D
Orlon

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Comment

2)The monomer of natural rubber is isoprene (2-methyl-l, 3-butadine) and is also called as cis -1, 4 polyisoprene.

65 Which compound has the highest boiling point?

A
n-pentane
B
Isopentane
C
Neopentane
D
Isobutane

View Explanation
Comment

The boiling point of n-pentane is 36.1°C.
The boiling point of isopentane is 27.8°C.
The boiling point of neopentane is 9.5°C.
The boiling point of isobutane is -llrc.
So, n-pentane has the highest boiling point.