Q68 of 72 Page 99

Note : In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.

NaCl reacts with concentrated H2SO4 to give colourless fumes with pungent smell. But on adding MnO2 the fumes become greenish because MnO2oxidisesHCl to chlorine gas which is greenish yellow

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Note : In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.

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Note : In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.

 69

Note : In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.

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An amorphous solid “A” burns in air to form a gas “B” which turns lime water milky. The gas is also produced as a by-product during roasting of sulphideore. This gas decolourises acidified aqueous KMnO4 solution and reduces Fe3+ to Fe2+. Identify the solid “A” and the gas “B” and write the reactions involved.