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Subjects
Science State Board
Class 10
Atoms and Molecules
Textbook questions

2. Choose the best answer II

Exercise condition:

5 m.

1. Which of the following statement is incorrect?

$12$ $gram$ of $C – 12$ contains Avogadro’s number of atoms.
One mole of oxygen gas contains Avogadro’s number of molecules.
One mole of hydrogen gas contains Avogadro’s number of atoms.
One mole of electrons stands for $6.023\times10^{23}$ electrons.

2. The volume occupied by

$1$

$mole$ of a diatomic gas at STP is

$22.4$ $litre$
$11.2$ $litre$
$5.6$ $litre$
$44.8$ $litre$

3. In the nucleus of

$_{20}\textrm{Ca}^{40}$ , there are

$20$ protons and $40$ electrons
$20$ protons and $20$ neutrons
$20$ protons and $40$ neutrons
$40$ protons and $20$ electrons

4. The gram molecular mass of oxygen molecule is

$16$ $g$
$17$ $g$
$18$ $g$
$32$ $g$

5.

$1$ mole of any substance contains __________ molecules.

$12.046\times10^{23}$
$3.0115\times10^{23}$
$6.023\times10^{-23}$
$6.023\times10^{23}$

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