Chemistry Question Bank

Na₂SO₃ on being heated with sulphur produces

The number of S—S bonds in sulphur trioxide trimer S₃O₉ is:

Which of the following does not have S—S linkage? (a) S O (b) S O (c) S O (d) S O

Assertion: O₃ has a fishy smell. Reason: It absorbs red part of the visible light.

Assertion: The electronic structure of O₃ is Reason: The following structure is not allowed because the octet around O cannot be expanded.

Assertion: Although PF₅, PCl₅ and PBr₅ are known, the pentahalides of nitrogen have not been observed. Reason: Phosphorous has a lower electronegativity than nitrogen.

Assertion: HNO₃ is a stronger acid than HNO₂. Reason: In HNO₃ there are two nitrogen to oxygen bonds whereas in HNO₂ there is only one.

The shape of XeO₂F₂ molecule is:

The oxidation state of xenon atom in XeF₄, HXeO and Na₄XeO₆ are respectively:

When F₂ reacts with hot and conc. alkali, then following will be obtained: (i) OF₂ (ii) O₂ (iii) H₂O (iv) NaF

Dry Cl₂ reacts with dry SO₂ to form:

Which of the following oxides of chlorine is obtained by passing dry chlorine over silver chlorate at 900C?

HClO₄ + P₂O₅ → (A) + (B)

When iodine is treated with a mixture of NaF, NaBr and NaCl in water, it gives

Liquid I₂ Cl₆ has the structure (a)

The property of halogens, that indicated incorrect is:

When H₂S gas is passed into aqueous sulphur dioxide

Na₂SO₃ on being heated with sulphur produces

The number of S—S bonds in sulphur trioxide trimer S₃O₉ is:

Which of the following does not have S—S linkage? (a) S O (b) S O (c) S O (d) S O

Which is not correct regarding the Holme’s signal?

White phosphorus reacts with calcium to give a certain compound. This compound on hydrolysis produces

White phosphorus on reaction with limewater gives calcium salt of an acid (A) along with a gas (X). Which of the following is correct?

Phosphorus is obtained by

NH₄NO₂ NH₄NO₂ on heating gives