1
NDA 2019 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
Which one of the following is not a synthetic detergent?
A
CH3(CH2)10CH2OSO$$_3^ - $$Na+
B
[CH3(CH2)15 - N - (CH3)3]+Br$$-$$
C
CH3(CH2)16COO$$-$$Na+
D
CH3(CH2)16COO(CH2CH2O)n . CH2CH2OH
2
NDA 2019 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
Which one of the following is an example of a clean fuel?
A
Coke
B
Propane
C
Petrol
D
Wax
3
NDA 2019 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
Which one of the following metals does not react with cold water?
A
Calcium (Ca)
B
Potassium (K)
C
Magnesium (Mg)
D
Sodium (Na)
4
NDA 2019 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
In which of the following pairs are the isoelectronic ions?
A
Mg2+, Ar
B
Na+, O2$$-$$
C
Al3+, Cl$$-$$
D
K+, Ne
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