Chemistry 1st Paper MCQ-Jessore Board-2023

1. $\begin{array}{l} \mathrm{CO}(\mathrm{g})+\mathrm{H}_{2} \mathrm{O}(\mathrm{g}) \rightleftharpoons \mathrm{CO}_{2}(\mathrm{~g})+\mathrm{H}_{2}(\mathrm{~g}) \\ \Delta \mathrm{H}=+41 \mathrm{~kJ} / \mathrm{mol} . \end{array}$

For the above reaction-

i. if temperature is increased, the equilibrium will shift to the right

ii. increase of pressure has no effect on equilibrium

iii. increase of concentration of reactants may increase the backward rate of reaction

Which one is correct?

2. Characteristics of the reaction are-

i. volume contraction occure in forward reaction

ii. excess amount of O₂ addition may change the equilibrium towards left direction

iii. backward reaction would be endothermic

Which one is correct?

3. Which one of the following is anti-oxidant agent?

4. Which one of the following is the correct order of the radius-

For element 'Z'-

i. oxidation number is changeable

ii. the value of magnetic quantum number of two electrons in the last shell be different

iii. Ammonium oxalate is used for the identification of $Z^{2+}$ ion

Which one is correct?