The composition of carnallite is

• KCl.MgCl₂.6H₂O

• NaAlO₂

• Fe₃O₄

• Na₃AlF₆

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.

Phosgene is the common name of the following compound :

• Mixture of CO₂ and Cl₂

• POCl₃

• Carbonyl chloride

• Carbon tetrachloride

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.

1215.

How many P = 0 bond present in (HPO₃)₃?

• 0

• 3

• 6

• 9

The substance used in smoke screen is :

• sodium chloride

• sodium phosphate

• calcium fluoride

• calcium phosphide

Which of the following is the correct statement for PH₃?

• It is less poisonous than NH₃.

• It is less basic than NH₃.

• Electronegativity of PH₃ >NH_3.

• It does not show reducing properties.

HCl is a gas but HF is a low boiling liquid .This is because :

• H-F bond is strong

• H-F bond is weak

• molecules aggregate because of hydrogen bonding

• HF is a weak acid

Ostwald process is used for the manufacture of :

• nitric acid

• sulphuric acid

• ammonia

• bleaching powder

The chemical used for cooling in refrigerators is :

• CO₂

• NH₄OH

• NH₄Cl

• liquid NH₃