Chemistry 1st Paper MCQ-Rajshahi Board-2022

1. If $\mathrm{M}^{3+}$ ion has 23 electrons, what is the atomic number of M?

2. Which set of the following has common ion effect?

3. To increase the temperature of the following reaction : $2 \mathrm{SO}_{2}(\mathrm{~g})+\mathrm{O}_{2}(\mathrm{~g}) \rightleftharpoons 2 \mathrm{SO}_{3}(\mathrm{~g})+$ $44.8 \mathrm{KCal}$

i. amount of $\mathrm{SO}_{2}$ decreases

ii. value of $\mathrm{K}_{c}$ decrease

iii. reaction will be backward .

Which one is correct?

4. How many basic principles do green chemistry have?

5.

[U, $V$ and $W$ don't represent symbol of elements]

In case of $U, U$ and $W$ in the stem-

i. chloride of $U$ is hydrolysed

ii. W shows variable valency

iii. $U$ and $W$ have similar physical property

Which one is correet?