1
NDA General Ability 18 April 2021
MCQ (Single Correct Answer)
+4
-1.33
Which of the following sets of elements has the same valency?
A
Na, Mg, Ca
B
Na, Mg, Al
C
Mg, Ca, K
D
Mg, Ca, Ba
2
NDA General Ability 18 April 2021
MCQ (Single Correct Answer)
+4
-1.33
The process whereby certain minerals absorb water, expand and change is called as
A
Hydration
B
Oxidation
C
Hydrolysis
D
Carbonation
3
NDA General Ability 18 April 2021
MCQ (Single Correct Answer)
+4
-1.33
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
4
NDA General Ability 18 April 2021
MCQ (Single Correct Answer)
+4
-1.33
Hydrogenation of vegetable oils using nickel catalyst is an example of
A
Substitution reaction
B
Elimination reaction
C
Addition reaction
D
Free-radical polymerization