1
NDA General Ability 18 April 2021
MCQ (Single Correct Answer)
+4
-1.33
Change Language
Which one of the following statements about the cleansing action of soap is not true?
A
The oil and dirt gets collected in the centre of the micelle
B
Soap micelles scatter light
C
Soaps are ammonium salts of long chain carboxylic acids
D
Soap forms insoluble precipitates with the calcium and magnesium ions in hard water
2
NDA General Ability 18 April 2021
MCQ (Single Correct Answer)
+4
-1.33
Change Language
Hydrogenation of vegetable oils using nickel catalyst is an example of
A
Substitution reaction
B
Elimination reaction
C
Addition reaction
D
Free-radical polymerization
3
NDA General Ability 18 April 2021
MCQ (Single Correct Answer)
+4
-1.33
Change Language
Which one of the following materials is not an allotrope of carbon ?
A
Diamond
B
Graphene
C
Fly ash
D
Fullerene
4
NDA General Ability 18 April 2021
MCQ (Single Correct Answer)
+4
-1.33
Change Language
Which one of the following reactions does not result in the evolution of hydrogen gas?
A
Reaction of zinc metal with dilute sulphuric acid solution
B
Mixing water to Plaster of Paris
C
Heating zinc metal with sodium hydroxide solution
D
Reaction of potassium metal with water
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