1.

(A) Helium is preferred than hydrogen in filling ballons for meterological observations(R) Helium is lighter than hydrogen and it is non-combustible in nature

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Both (A) and (R) are true and (R) is the CORRECT EXPLANATION of (A)
Both (A) and (R) are true and (R) is not the correct explanation of (A)
(A) is true but (R) is false
Both (A) and (R) are false

Answer :C


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