We need a 20% aqueous solution of sodium hydroxide for the study of saponification reaction. When we open the lid of the bottle containing solid sodium hydroxide we observe it in which form?

Colourless transparent beads

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Small white beads

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White amorphous solid

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Fine white powder

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White pellets/ flakes

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Solution

The correct option is E White pellets/ flakes
Sodium hydroxide is generally available in the form of white pellets/ flakes. Note: Sodium hydroxide is highly hygroscopic. Hence, it should be prevented from moisture.

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Q.
In order to study saponification reaction we first prepare 20% solution of sodium hydroxide. If we record the temperature of this solution just after adding sodium hydroxide flakes to water and also test its nature using litmus, it may be concluded that the process of making this solution is :

A student prepared 20% sodium hydroxide solution in a beaker to study saponification reaction. Some observations related to this are given below:

(I) Sodium hydroxide solution turns red litmus blue
(II) Sodium hydroxide readily dissolves in water
(III) The beaker containing solution appears cold when touched from outside
(IV) The blue litmus paper turns red when dipped into the solution

The correct observations are :

A student prepared $20 %$ sodium hydroxide solution in a beaker containing water. The observations noted by him are given below

(I) Sodium hydroxide is in the form of pellets.

(II) It dissolves in water readily.

(III) The beaker appears cold when touched from outside.

(iv) The red litmus paper turns blue when dipped into the solution

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Q. An aqueous solution of sodium hydroxide reacts with white phosphorous to form phosphine

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We need a 20% aqueous solution of sodium hydroxide for the study of saponification reaction. When we open the lid of the bottle containing solid sodium hydroxide we observe it in which form?

The correct option is E White pellets/ flakesSodium hydroxide is generally available in the form of white pellets/ flakes. Note: Sodium hydroxide is highly hygroscopic. Hence, it should be prevented from moisture.

The correct option is E White pellets/ flakes
Sodium hydroxide is generally available in the form of white pellets/ flakes. Note: Sodium hydroxide is highly hygroscopic. Hence, it should be prevented from moisture.