MCQ
Which one of the following is the lightest ?
- A$0.2$ mole of hydrogen gas
- B$6.023 \times 10^{23}$ molecules of nitrogen
- ✓$0.1\,g$ of silver
- D$0.1 \,mole$ of oxygen gas
✓
Answer
Correct option: C.
$0.1\,g$ of silver
c
By going through options,
By going through options,
$(1)$ Weight of $H _{2}=$ mole $\times$ molecular weight
$=0.2 \times 2$
$=0.4\, g$
$(2)$ $6.023 \times 10^{23}= 1 \,mol$
$6.023 \times 10^{22}= 0.1 \,mol$
The weight of Nitrogen,
$N _{2}=0.1 \times 28=2.8 \,g$
$(3)$ Weight of silver is $0.1 \,g$
$(4)$ Weight of oxygen $=32 \times 0.1=3.2\, g$
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