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JEE CHEMISTRY MCQ: P-BLOCK ELEMENTS

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Which of the following is/are CORRECT from the given below?

(I) Brown ring test for nitrate depends on the ability of

{Fe}^{2+}

to reduce nitrate to nitric oxide
(II) Red phosphorus is much less reactive than white phosphorus

(III) Red phosphorus readily catches fire in air to give white fumes

(IV) White phosphorus is a translucent white waxy solid

View answer and explanation

Correct option: D

I, II and IV

Option D (I, II and IV) is correct because statements I, II, and IV are correct regarding the brown ring test, reactivity of red phosphorus, and the nature of white phosphorus.

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The gas used for inflating the tyres of aeroplanes is: Which of the following is correct stability order of oxides of

17^{\text {th }}

group elements is: Assertion: Ozone is a powerful oxidising agent in comparison to

{O}_2

.

Reason: Ozone is diamagnetic but

{O}_2

is paramagnetic. Which of the following is kept in water?

\mathrm{C}{\mathrm{N}^ - }

{\mathrm{N}_2}

are isoelectronic but in contrast to

\mathrm{C}{\mathrm{N}^ - },\mathrm{\;}{\mathrm{N}_2}

is chemically inert because of: Consider the following statements

(i) Reaction

2 {Fe}^{3+}+{SO}_2+2 {H}_2 {O} \rightarrow 2 {Fe}^{2+}+{SO}_4^{2-}+4 {H}^{+}

shows reducing character of sulphur dioxide

(ii)

{H}_2 {~S}_2 {O}_8

{S}={O}

{S}-{OH}

{O}-

{O}

{NH}_3

gas can be dried effectively by using conc.

{H}_2 {SO}_4

.

(iv) One of the major use of

{H}_2 {SO}_4

is in the manufacture of fertilizers.

Which of the following is the correct code for the statements above?