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Sohail, a class 10 student conducted the following tests on an unknown substance X and recorded his observations as shown in the table.

S.No. Test Observation
1. X is strongly heated. with calcium hydroxide A gas is produced which forms white precipitate
2. Excess of X is added to sulphuric acid pH of solution increases to 7.
3. Sodium hydroxide is added to X A green precipitate is produce
Substance X is

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Ferric carbonate

Ferrous carbonate

Magnesium carbonate

Calcium sulphate

answer is B.

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Detailed Solution

$\underset{{FeCO}_{3}}{X} ⟶ {Fe}_{2} O_{3} + {CO}_{2}$
$\begin{array}{l} X + H_{2} {SO}_{4} \\ {FeCO}_{3} + H_{2} {SO}_{4} \to \underset{Geen ppt}{{FeSO}_{4}} + H_{2} {CO}_{3} \\ {FeCO}_{3} + NaOH \to \underset{Fe (OH)_{2}}{{Na}_{2} {CO}_{3}} \end{array}$

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