Match List (Fuels) with List II (composition) and select the correct answer using the codes given below the lists: List I (Fuels) List II (Composition) (1) Water gas i A mixture of CO and N 2 (2) Producer gas ii Methane (3) Coal gas iii A mixture of CO and H 2 (4) Natural gas iv A mixture of CO , H 2 , CH 4 and CO 2

( 1 ) ( 2 ) ( 3 ) ( 4 ) iii i iv ii

( 1 ) ( 2 ) ( 3 ) ( 4 ) iii i ii iv

( 1 ) ( 2 ) ( 3 ) ( 4 ) i iii iv ii

( 1 ) ( 2 ) ( 3 ) ( 4 ) iii ii iv i

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-4>Q 38

EASY

JEE Main/Advance

IMPORTANT

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Aqueous solution containing $1$ mol of borax reacts with $2$ mol of acids. This is because of :

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Important Questions on The p-Block Elements

MEDIUM

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 19 - The p-Block Elements>Exercise-4>Q 39

Match List (Fuels) with List II (composition) and select the correct answer using the codes given below the lists:

	List I (Fuels)		List II (Composition)
(1)	Water gas	i	A mixture of $CO$ and $N_{2}$
(2)	Producer gas	ii	Methane
(3)	Coal gas	iii	A mixture of $CO$ and $H_{2}$
(4)	Natural gas	iv	A mixture of $CO, H_{2}, {CH}_{4}$ and ${CO}_{2}$