Question

. A student was provided with the white colored powder and was instructed to heat it gently. The evolved gas turned moist blue litmus red and the white powder is used in bakery to make the dough fluffy. Now answer the questions.
i) What is the chemical formula of the white powder?
ii) Give the equation when that white powder is heated gently.
iii) Predict the nature of the gas which was evolved during heating the white powder.

Answer 1

When a white powder (A) is strongly heated, it gives of a colourless, odourless gas (B) which turns lime water milky (C) and if the passage of this gas is continued the milkiness disappears and gives a solution (D). The solid residue (E) is yellow when hot, but turns white on cooling. Idnetify (A) to (E) with help of the equations.

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