Equilibrium's Question 44 | Chemistry XI - Part 1 | NCERT Exemplar Questions

Physical Chemistry

Some Basic Concepts of Chemistry Structure of Atom States of Matter Thermodynamics Equilibrium

Inorganic Chemistry

Classification of Elements and Periodicity in Properties Chemical Bonding and Molecular Structure

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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

MCQ (Single Correct Answer)

Assertion (A) Aqueous solution of ammonium carbonate is basic.

Reason (R) Acidic/basic nature of a salt solution of a salt of weak acid and weak base depends on $\mathrm{K}_{\mathrm{a}}$ and $\mathrm{K}_{\mathrm{b}}$ value of the acid and the base forming it.

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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