JEE CHEMISTRY MCQ: P-BLOCK ELEMENTS

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Analyzing +4 | -1

When a mixture of

\mathrm{NaCl}

and

\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7

is gently warmed with conc.

\mathrm{H}_2 \mathrm{SO}_4

(i) an orange-red vapour is evolved
(ii) the vapour formed when passed into

\mathrm{NaOH}

solution gives yellow solution of

\mathrm{Na}_2 \mathrm{CrO}_4

(iii) Chlorine gas is not evolved at all
(iv) chromyl chloride gas is formed
(v)

\mathrm{SnCl}_4

used instead of

\mathrm{NaCl}

also gives same observations

View answer and explanation

Correct option: C

3 statements are correct

Option C (3 statements are correct) is correct because statements (i), (ii), and (iv) are correct regarding the reaction of NaCl and K2Cr2O7 with conc. H2SO4.

More Questions from P-BLOCK ELEMENTS

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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}^ - }

ion and

{\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

contains four

{S}={O}

, two

{S}-{OH}

and one

{O}-

{O}

bond

(iii)

{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?