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Home
All Subjects
CSS
CSS MPT
CSS Subjects MCQs
CSS Past Papers
Past Papers
Testing Agencies Papers
Departmental Past Papers
Post Wise Papers
Service Related MCQs
Departments Related MCQs
Service Commission
FPSC
PPSC
SPSC
BPSC
KPPSC
Current Affairs
National Current Affairs MCQs
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Subject:
Chemistry
Laughing gas has chemical composition of following two elements ?
A.
Nitrogen + Hydrogen
B.
Nitrogen + Carbon
C.
Nitrogen + Oxygen
D.
Oxygen + Carbon
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