1
NDA 2017 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
Which one of the following is a chemical change?
A
Cutting of hair
B
Graying of hair naturally
C
Swelling of resin in water
D
Cutting of fruit
2
NDA 2017 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
Which one among the following chemicals is used as washing soda?
A
Calcium carbonate
B
Calcium bicarbonate
C
Sodium carbonate
D
Sodium bicarbonate
3
NDA 2017 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
Why is potassium permanganate used for purifying drinking water?
A
It kills germs
B
It dissolves the impurities
C
It is a reducing agent
D
It is an oxidising agent
4
NDA 2017 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
The principal use of hydrofluoric acid is
A
in etching glass
B
as a bleaching agent
C
as an extremely strong oxidising agent
D
in the preparation of strong organic fluorine compounds
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