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1. Some basic concept of chemistry — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry1. Some basic concept of chemistry1 Mark
MCQ
Which of the following has least mass
  • A
    $2\;g$ atom of nitrogen
  • ✓
    $3 \times {10^{23}}$ atoms of $C$
  • C
    $1$ mole of $S$
  • D
    $7.0\;g$ of $Ag$
✓

Answer

Correct option: B.
$3 \times {10^{23}}$ atoms of $C$
b
(b) $( a)$ $2\,gm $ atom of nitrogen $= 28\,gm$

$(b)$ $6 \times {10^{23}}$ atoms of $C$ has mass $ = 12\,gm$

$3 \times {10^{23}}$ atoms of $C$ has mass $ = \frac{{12 \times 3 \times {{10}^{23}}}}{{6 \times {{10}^{23}}}} = 6\,gm$

$(c)$ $1$ mole of $S$ has mass $= 32\,gm$

$(d)$ $7.0\,gm$ of $Ag$

So, lowest mass = $6\,gm$ of $C$.

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