Ingredients used in kitchens always amazes us through their magic. One of them is baking powder which has a compound X as its major constituent. The compound X sometimes also helps in getting relief from acid indigestion or even in ant bite. In the laboratory, when we heat compound X, it gets converted into Y which is anhydrous but absorbs water to become a hydrated salt Z, one of the raw materials of soaps and detergents.

(iii) The aqueous solution of Y changes _______.

red litmus to blue

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blue litmus to red

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red litmus to colourless

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blue litmus to colourless

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Solution

The correct option is A red litmus to blue
The pH of distilled water is 7. So, the water is neutral before adding sodium carbonate. The pH value for sodium carbonate is around 11, hence it is basic in nature.

When a small amount of sodium carbonate is added to water, the pH of the water increases above 7. Therefore, the solution becomes basic and changes red litmus blue.

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Similar questions

Q. Ingredients used in kitchens always amazes us through their magic. One of them is baking powder which has a compound X as its major constituent. The compound X sometimes also helps in getting relief from acid indigestion or even in ant bite. In the laboratory, when we heat compound X, it gets converted into Y which is anhydrous but absorbs water to become a hydrated salt Z, one of the raw materials of soaps and detergents.

(iv) Compound X is a basic compound because it is a salt of a ______________.

When we apply baking soda solution on an ant or bee sting, it gets cured. But, soap solution is also a base and if we apply to it why does the sting doesn't get cured?

Q. Salt

A

commonly used in bakery products, on heating, gets converted into another salt

B

which itself is used for removal of hardness of water and a gas

C

is evolved. The gas

C

when passed through lime water turns it milky. Identify

A, B

and

C

Q. Salt A, commonly used in bakery products, on heating, gets converted into another salt B. B is used for the removal of hardness of water and a gas C is evolved. The gas C when passed through lime water, turns it milky. Identify A, B, and C.

Q. (i) A black coloured compound (B) is formed on passing hydrogen sulphide through the solution of a compound (A) in

{N H}_{4} O H

.
(ii) (B) on treatment with hydrochloric acid and potassium chlorate gives (A).
(iii) (A) on treatment with potassium cyanide gives a buff coloured precipitate which dissolves in excess of this reagent forming a compound (C).
(iv) The compound (C) is changed into a compound (D) when its aqueous solution is boiled.
(v) The solution of (A) is treated with excess of sodium bicarbonate and then bromine water. On cooling and shaking for sometime, a green colour of compound (E) is formed. No change is observed on heating.
Identify (A) &(B) .

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