41.

The composition of carnallite is

• KCl.MgCl₂.6H₂O

• NaAlO₂

• Fe₃O₄

• Na₃AlF₆

Assertion : Fe³⁺ can be used for coagulation of As₂S₃ sol.

Reason : Fe³⁺ reacts with As₂S₃ to give Fe₂S₃.

• 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 : K₂Cr₂O₇ is used as primary standard in volumetric analysis.

Reason : It has a good solubility in water.

• 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: Sb₂S₃ is not soluble in yellow ammonium sulphide.

Reason : The common ion effect due to S^2- ions reduces the solubility of Sb₂S₃

• 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 : Zinc displaces copper from copper sulphate solution.

Reason : The E${}_{298 \mathrm{K}}^{°}$ of Zn is -0.76 V and that of Cu is +0.34 V.

• 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 : Pure iron when heated in dry air is covered with a layer of rust.

Reason : Rust has the composition Fe₃O₂.

• 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

The reaction of a primary amine with chloroform and ethanolic solution of KOH is called

• Hofmann's reaction

• coupling reaction

• carbylamine reaction

• Curtius reaction

Lysine is least soluble in water in the pH range

• 3 to 4

• 5 to 6

• 6 to 7 

• 9 to 10

Benzoic acid is treated with lithium aluminium hydride. The compound obtained is

• benzaldehyde

• benzyl alcohol

• toluene

• benzene

The polymer obtained by the interaction of ethylene glycol and terephthalic acid is

• nylon

• dacron

• teflon

• bakelite