The basicity of pyrophosphorous acid ( H₄P₂O₅) is _______.

The correct order of the thermal stability of hydrogen halide is_______.

When copper is heated with conc HNO₃ it produces ________.

The hybridisation and shape of SF₆ is respectively?

Which one of the following orders is not in accordance with the property stated against it?

Repeated use of which one of the following fertilizers would increase the activity of the soil_______.

Oxidation states of P in H₄P₂O₅, H₄P₂O₆, H₄P₂O₇ are respectively _______.

About" Ammonia"
I. Ammonia is formed by the hydrolysis of urea.
II. It is heavier than air.
III. It can readily liquefied by at about atmospheric pressure.
IV. Liquid ammonia resembles water in its physical properties.
a) I, III and IV only
b) II, I, III and IV
c) II, I, IV and III
d) I, II, III and IV

About "White phosphorous"
I. It's ignition temperature in very high.
II. It glows in the dark due to oxidation.
III. White phosphorous is poisonous in nature.
IV. It has pungent smell.
a) II and III only
b) II and IV only
c) II, I, IV and III
d) I, II, III and IV

Assertion: Noble gases have highest ionization energies in their respective periods.
Reason: The outermost sub-shell of noble gases in which electron enters is completely filled.
Codes:
a) Both assertion and reason are true and reason is the correct explanation of the assertion
b) Both assertion and reason are true and reason is not the correct explanation of the assertion
c) Assertion is true but reason is false
d) Both assertion and reason are false

Assertion: PH₅ is not possible.
Reason: -5 oxidation state of phosphorus is not possible.
Codes:
a) Both assertion and reason are true and reason is the correct explanation of the assertion
b) Both assertion and reason are true and reason is not the correct explanation of the assertion.
c) Assertion is true but reason is false
d) Both assertion and reason are false

a) Ammonia molecule is pyramidal in shape
b) Ammonia and water are linked by hydrogen bonds.
c) Nitric acid decomposes on exposure to sunlight.
d) Metal nitrate is formed with the release of nitrogen.

Which among the following is mismatched regarding the shape?
a) XeF₄ - square planar
b) XeOF₄ - square pyramidal
c) XeF₆ - Distorted octahedral
d) XeO₃ - Bent T shape

Explain why fluorine always exhibit an oxidation state of -1?

What is the reaction of Phosphorous with alkali?

Why does ozone act as a powerful oxidising agent?

Write the reason for the anomalous behaviour of Nitrogen.

Why do noble gases form compounds with fluorine and oxygen only?

Write the order of thermal stability of the hydrides of group 16 elements.

Predict the product
(i) PCI₅+ C₂H₅OH \(\longrightarrow \)?
(ii) P₄+ SO₂Cl₂ \(\longrightarrow \) ?
(iii) POCl₃ + H₂O \(\longrightarrow \) ?
(iv) HBr + PH₃\(\longrightarrow \) ? :,
(v) PCl₃+ H₂O\(\longrightarrow \) ?

Suggest a reason why HF is a weak acid, whereas binary acids of the all other halogens are strong acids.

Mention the uses of helium.

An element A occupies group number 15 and period number 3, reacts with chlorine to give compound B. The compound B on hydrolysis gives a dibasic acid C. The compound C on heating undergoes auto oxidation and reduction to give a tribasic acid D. Identify the elements A compounds B, C and D. Write the reactions.