AP EAMCET · Chemistry · Surface Chemistry

Sodium nitrite is reacted with $H_{2} {SO}_{4}$ to form ${NaHSO}_{4}, {HNO}_{3},$ water and $X$ . Gold is dissolved in aqua regia to form water, ${AuCl}_{4}^{-}$ and $Y . X$ and $Y$ are respectively

A $NO, {NO}_{2}$
B ${NO}_{2}, NO$
C $NO, NO$
D $N_{2} O, NO$

Verified Solution

Answer & Solution

Correct Answer

(C) $NO, NO$

Step-by-step Solution

Detailed explanation

Sodium nitrite reacts with sulphuric acid to form sodium sulphate, nitric acid and nitric oxide. 2NaNO2 + H2SO4 → Na2SO4 + NO + H2O Gold reacts with aqua regia to form nitric oxide, water and a complex of gold.…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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Sodium nitrite is reacted with H2SO4 to form NaHSO4,HNO3, water and X. Gold is dissolved in aqua regia to form water, AuCl4- and Y.X and Y are respectively

Step-by-step Solution

Sodium nitrite is reacted with $H_{2} {SO}_{4}$ to form ${NaHSO}_{4}, {HNO}_{3},$ water and $X$ . Gold is dissolved in aqua regia to form water, ${AuCl}_{4}^{-}$ and $Y . X$ and $Y$ are respectively