1
NDA 2017 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
Molecules of which of the following has cage like structure?

1. Diamond, 2. Graphite, 3. Fullerenes

Select the correct answer using the code given below.
A
All of these
B
2 and 3
C
Only 2
D
Only 3
2
NDA 2017 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
Temporary hardness in water is due to which one of the following of calcium and magnesium?
A
Hydrogen carbonates
B
Carbonates
C
Chlorides
D
Sulphates
3
NDA 2017 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
Which one of the following elements is least reactive with water?
A
Lithium
B
Sodium
C
Potassium
D
Cesium
4
NDA 2017 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
Rutherford's alpha-particle scattering experiment was responsible for the discovery of
A
electron
B
proton
C
nucleus
D
helium
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