Equilibrium's Question 43 | Chemistry XI - Part 1 | NCERT Exemplar Questions

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Subjective

Match the Column I with Column II.

	Column I		Column II
A..	Equilibrium	1.	$$ \Delta G>0, K<1 $$
B.	Spontaneous reaction	2.	$$\Delta G=0$$
C.	Non-spontaneous reaction	3.	$$\Delta G^\circ =0$$
		4.	$$\Delta G < 0, K > 1$$

Explanation

A. $\rightarrow(2,3)$

B. $\rightarrow$ (4)

C. $\rightarrow(1)$

A. $\Delta G\left(\Delta G^{\ominus}\right)$ is 0 , reaction has achieved equilibrium: at this point, there is no longer any free energy left to drive the reaction.

B. If $\Delta G<0$, then $K>1$ which implies a spontaneous reaction or the reaction which proceeds in the forward direction to such an extent that the products are present predominantly.

C. If $\Delta G>0$, then $K<1$, which implies a non-spontaneous reaction or a reaction which proceeds in the forward direction to such a small degree that only a very minute quantity of product is formed.

MCQ (Single Correct Answer)

Assertion (A) Increasing order or acidity of hydrogen halides is $\mathrm{HF}<\mathrm{HCI}<\mathrm{HBr}<\mathrm{HI}$.

Reason (R) While comparing acids formed by the elements belonging to the same group of periodic table, H-A bond strength is a more important factor in determining acidity of an acid than the polar nature of the bond.

Both $A$ and $R$ are true $R$ is the correct explanation of $A$

Both $A$ and $R$ are true but $R$ is not the correct explanation of $A$

$A$ is true but $R$ is false

Both A and R are false

MCQ (Single Correct Answer)

Assertion (A) A solution containing a mixture of acetic acid and sodium acetate maintains a constant value of pH on addition of small amounts of acid or alkali.

Reason (R) A solution containing a mixture of acetic acid and sodium acetate acts as buffer solution around pH 4.75 .

Both $A$ and $R$ are true and $R$ is the correct explanation of $A$

Both $A$ and $R$ are true but $R$ is not the correct explanation of $A$

$A$ is true but $R$ is false

Both A and R are false

MCQ (Single Correct Answer)

Assertion (A) The ionisation of hydrogen sulphide in water is low in the presence of hydrochloric acid.

Reason (R) Hydrogen sulphide is a weak acid.

Both $A$ and $R$ are true and $R$ is the correct explanation of $A$

Both $A$ and $R$ are true but $R$ is not the correct explanation of $A$

$A$ is true but $R$ is false

Both $A$ and $R$ are false

MCQ (Single Correct Answer)

Assertion (A) For any chemical reaction at a particular temperature, the equilibrium constant is fixed and is a characteristic property.

Reason (R) Equilibrium constant is independent of temperature.

Both $A$ and $R$ are true and $R$ is the correct explanation of $A$

Both $A$ and $R$ are true but $R$ is not the correct explanation of $A$

$A$ is true but $R$ is false

Both $A$ and $R$ are false

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