Phosphine is generally prepared in the laboratory by

heating white phosphorus with an aqueous solution of caustic soda.

heating phosphorus in a current of hydrogen.

decomposition of P 2 H 4 at 110 ° C .

heating red phosphorus with an aqueous solution of caustic soda.

What is inert pair effect?

The inert pair effect is the reluctance of s electrons of the outermost shell to participate in bonding. This is due to the poor screening effect of the d and f orbitals. This effect is observed among the p -block elements, due to which the lower oxidation state (two units less than the group oxidation state) becomes more stable for heavier elements in each group. For example in Pb , + 2 oxidation state is more predominant than the + 4 oxidation state.

Among the following, the correct statement(s) is(are)

The Lewis acidity of B C l 3 is greater than that of A l C l 3 .

A l C l 3 has the three-centre two-electron bonds in its dimeric structure.

E M B I B E

Alpha Question Bank for Engineering: Chemistry>Chapter 19 - The p-Block Elements>Exercise-3>Q 75

EASY

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IMPORTANT

Earn 100

Good reducing nature of $H_{3} P O_{2}$ is attributed to the presence of:

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Important Questions on The p-Block Elements

EASY

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IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 19 - The p-Block Elements>Exercise-3>Q 76

Iodine reacts with concentrated

H N O_{3}

to yield

Y

along with other products. The oxidation state of iodine in

Y

, is:

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IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 19 - The p-Block Elements>Exercise-3>Q 77

Give an example of oxidation of one halide by another halogen. Explain the feasibility of reaction.

HARD

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IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 19 - The p-Block Elements>Exercise-3>Q 78

The set with the correct order of acidity is:

MEDIUM

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IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 19 - The p-Block Elements>Exercise-3>Q 81

Under ambient conditions, the total number of gases released as products in the final step of the reaction scheme shown below is:

Question Image

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Alpha Question Bank for Engineering: Chemistry>Chapter 19 - The p-Block Elements>Exercise-3>Q 82

In case of nitrogen, ${NCl}_{3}$ is possible but not ${NCl}_{5}$ ; while in case of phosphorous, ${PCl}_{3}$ as well as ${PCl}_{5}$ are possible. It is due to ______.