During laboratory preparation \( \mathrm{CH}_{4} \) gas is collected by downward displacement of...

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During laboratory preparation \( \mathrm{CH}_{4} \) gas is collected by downward displacement of water because
a. \( \mathrm{CH}_{4} \) is lighter than \( \mathrm{Air} \)
b. \( \mathrm{CH}_{4} \) is poisonous gas
c. It does not dissolve in water
d. \( \mathrm{CH}_{4} \) is heavier than Air
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