Assertion: Monoclinic sulphur is an example of monoclinic crystal system.

 Reason: For a monoclinic system, a$\text{≠}$b $\text{≠}$ c and a$=$$\text{γ}$ = 90°, $\text{β}$$\text{≠}$90°.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Assertion: Chemistry of actinoids is more complicated than lanthanoids.

Reason: Actinoid elements are radioactive.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Assertion: Coagulation power of Al³⁺ is more than Na⁺.

Reason:Grealer the valency ofthe flocculating ion added, greater is its power to cause precipitation (Hardy-Schulze rule).

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Assertion : Al becomes passive in conc. HNO_3.

Reason: Conc. HNO₄, has no action on aluminium metal.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

•  If both assertion and reason are false.

Assertion: An ideal solution obeys Raoult's law.

Reason: In an ideal solution, solute-solute as well as solvent-solvent interactions are similar to solute-solvent interactions.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Assertion: Conductivity of all electrolytes decreases on dilution.

Reason: On dilution number of ions per unit volume decreases.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Assertion : Linkage isomerism arises in coordination compounds containing ambidentate ligand.

Reason: Ambidentate ligand has two different donor atoms.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Assertion: H₃PO₃is dibasic acid.

Reason: Two hydrogen atoms are directly attached to the P.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

49.

Which one of the following forms propanenitrile as the major product?

• Propyl bromide + alcoholic KCN

• Ethyl bromide + alcoholic KCN

• Ethyl bromide + alcoholic AgCN

• Propyl bromide + alcoholic AgCN

Which is a bactericidal antibiotic?

• Penicillin

• Erythromycin

• Tetracycline

• Chloramphenicol