Select the correct statement which is an example of a chemical change that is reversible.

Melting of wax

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Reaction of sodium chloride with water

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Reaction of hydrogen with iodine

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Butter getting rancid

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Solution

The correct options are
A Melting of wax
D Reaction of hydrogen with iodine
$(I)$ Melting of wax is reversible chemical change because on solidification of melted wax it can be obtained as it was before.
$(I I)$ Reaction of $H_{2}$ and $I_{2}$ is reversible.
$H_{2} + I_{2} ⇌ 2 H I$

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Similar questions

Q. Fill in the blanks with the correct words.
1. Melting of ice-cream is an example of a/an .................... (reversible/irreversible) change.
2. Ripening of fruits is an example of a/an .................... (reversible/irreversible) change.
3. Cooking of foood is an example of a/an .................... (reversible/irreversible) change.
4. Breaking of glass is a .................... (physical/chemical) change.
5. .................... (Heating/Cooling) causes steam to change into water.

Q. Sublimation of iodine is an example of ______ (physical/chemical) change.

Write the balanced chemical equations for the following reactions-

(a) Sodium carbonate on reaction with hydrochloric acid in equal molar concentration gives sodium chloride and sodium hydrogen carbonate.

(b) Sodium hydrogen carbonate on reaction with hydrochloric acid gives sodium chloride, water and liberates carbon dioxide.

(c) Copper sulphate on treatment with potassium iodide precipitates cuprous iodide $({Cu}_{2} I_{2})$ , liberates iodine gas and also forms potassium sulphate.

Q. Identify X, Y, and Z based on the following observations.

	X(Fe)	Y(Na)	Z(Mg)
Hardness	Hard	Soft	Relatively soft
Reactivity with water	Reacts with steam	Reacts with cold water	Reacts with hot water
Reaction with $C a C l_{2}$	No reaction	Formation of metal chloride	No reaction
Reaction with $Z n C l_{2}$	No reaction	Formation of metal chloride	Formation of metal chloride

[0.8 mark]

Select an example of reversible change.

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Select the correct statement which is an example of a chemical change that is reversible.

The correct options are A Melting of wax D Reaction of hydrogen with iodine(I) Melting of wax is reversible chemical change because on solidification of melted wax it can be obtained as it was before.(II) Reaction of H2 and I2 is reversible.H2+I2⇌2HI

The correct options are
A Melting of wax
D Reaction of hydrogen with iodine
$(I)$ Melting of wax is reversible chemical change because on solidification of melted wax it can be obtained as it was before.
$(I I)$ Reaction of $H_{2}$ and $I_{2}$ is reversible.
$H_{2} + I_{2} ⇌ 2 H I$