CTET Solved Paper - UPTET October 2017 Paper2
62. In laboratory, ethylene and acetylene can be distinguished by
- Option : C
- Explanation : (C) 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?
- Option : A
- Explanation : (A) 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
- Option : B
- Explanation : 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?
- Option : A
- Explanation : (A) 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.
