1
NDA General Ability 16 April 2023
MCQ (Single Correct Answer)
+4
-1.33
Change Language
Which of the hydrocarbons are arranged as per the increasing order of their boiling points?
A
Methane, Butane, Propane, Heptane
B
Propane, Butane, Pentane, Octane
C
Propane, Butane, Heptane, Methane
D
Octane, Ethane, Methane, Propane
2
NDA General Ability 16 April 2023
MCQ (Single Correct Answer)
+4
-1.33
Change Language
Which one of the following apparatus is used for separating benzene and water mixture?
A
Round bottom flask
B
Conical flask
C
Separating funnel
D
Dean and Stark apparatus
3
NDA General Ability 16 April 2023
MCQ (Single Correct Answer)
+4
-1.33
Change Language
An iron nail dipped in copper sulphate solution turns brown. This is due to which one of the following types of reactions?
A
Addition reaction
B
Decomposition reaction
C
Substitution reaction
D
Displacement reaction
4
NDA General Ability 16 April 2023
MCQ (Single Correct Answer)
+4
-1.33
Change Language
Toothpaste prevents tooth decay by:
A
neutralizing the excess acidity.
B
means of emulsification.
C
the action of fluoride.
D
making a coat of calcium over the teeth surface.
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