Chemistry Question Bank

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

In the cationic parts of solid N₂O₅ and solid N₂O₄, the bond order of N–O are, respectively,

When AgNO₃ is heated strongly above 800°C, it produces

Pure nitric acid is a colourless liquid, but on exposure to light it turns brownish due to

Which of the following compounds give NH₃ on heating? (I) NH₄NO₃ (II) NH₄NO₂ (III) (NH₄)₂ Cr₂O₇ (IV)(NH₄)₂CO₃ (V) Mg (NH₄) PO₄

N₂ is passed through overheated CaC₂. Which of the following options is correct for the product formed? (I) State of hybridization of C is sp. (II) Urea is an intermediate formed during hydrolysis of the above product…

Which of the following compounds does not form ammonia on heating?

The best reducing agent among the following is

NH₄Cl is preferred to NaCl for the preparation of HCl by the action of concentrated H₂SO₄ because

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

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

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