Additional important questions — task. Science State Board, Class 10.

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1.

The isotope of

$C-12$ contains

$12$ neutrons and no protons.
$6$ protons and $7$ electrons.
$6$ protons and $6$ neutrons.
$12$ protons and no neutrons.

2.

The volume occupied by

$3$ moles of

$HCl$ gas at STP is

$67.2$ $L$
$22.4$ $L$
$44.8$ $L$
$2.24$ $L$

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