Among statements (a)-(d), the correct ones are: (a) Decomposition of hydrogen peroxide gives dioxygen. (b) Like hydrogen peroxide,compounds, such as $KClO_3, Pb (NO_3)_2$ and $NaNO_3$ when heated liberate dioxygen. (c) 2-Ethylanthraquinone is useful for the industrial preparation of hydrogen peroxide. (d) Hydrogen peroxide is used for the manufacture of sodium perborate.

Question

The wavelength of the light emitted by a hydrogen atom during a transition from $ n = 3 $ to $ n = 2 $ is $ 656.3 \, \text{nm} $. What is the energy of the photon emitted during this transition?

Answer 1

The question involves evaluating several statements regarding the properties and uses of hydrogen peroxide and similar compounds. Let’s analyze each statement.

Decomposition of hydrogen peroxide gives dioxygen.
- Hydrogen peroxide decomposes according to the reaction: 2H_2O_2 \rightarrow 2H_2O + O_2, producing water and dioxygen. Thus, this statement is correct.
Like hydrogen peroxide, compounds such as KClO_3, Pb (NO_3)_2 and NaNO_3 when heated liberate dioxygen.
- Potassium chlorate ( KClO_3) decomposes on heating to give potassium chloride and dioxygen: 2KClO_3 \rightarrow 2KCl + 3O_2.
- Lead(II) nitrate ( Pb(NO_3)_2) decomposes on heating to lead(II) oxide, nitrogen dioxide, and dioxygen: 2Pb(NO_3)_2 \rightarrow 2PbO + 4NO_2 + O_2.
- Sodium nitrate ( NaNO_3) similarly decomposes to form sodium nitrite and dioxygen: 2NaNO_3 \rightarrow 2NaNO_2 + O_2.
- As all these compounds release dioxygen upon decomposition, the statement is correct.
2-Ethylanthraquinone is useful for the industrial preparation of hydrogen peroxide.
- This compound is used in the anthraquinone process, a major method in the industrial production of hydrogen peroxide. Thus, this statement is correct.
Hydrogen peroxide is used for the manufacture of sodium perborate.
- Sodium perborate is an important bleach that is manufactured using hydrogen peroxide. Therefore, this statement is also correct.

After evaluating all statements, it is clear that statements (a), (b), (c), and (d) are correct. Thus, the correct answer is:

(a), (b), (c) and (d)

Answer 2

The question involves evaluating several statements regarding the properties and uses of hydrogen peroxide and similar compounds. Let’s analyze each statement.

Decomposition of hydrogen peroxide gives dioxygen.
- Hydrogen peroxide decomposes according to the reaction: 2H_2O_2 \rightarrow 2H_2O + O_2, producing water and dioxygen. Thus, this statement is correct.
Like hydrogen peroxide, compounds such as KClO_3, Pb (NO_3)_2 and NaNO_3 when heated liberate dioxygen.
- Potassium chlorate ( KClO_3) decomposes on heating to give potassium chloride and dioxygen: 2KClO_3 \rightarrow 2KCl + 3O_2.
- Lead(II) nitrate ( Pb(NO_3)_2) decomposes on heating to lead(II) oxide, nitrogen dioxide, and dioxygen: 2Pb(NO_3)_2 \rightarrow 2PbO + 4NO_2 + O_2.
- Sodium nitrate ( NaNO_3) similarly decomposes to form sodium nitrite and dioxygen: 2NaNO_3 \rightarrow 2NaNO_2 + O_2.
- As all these compounds release dioxygen upon decomposition, the statement is correct.
2-Ethylanthraquinone is useful for the industrial preparation of hydrogen peroxide.
- This compound is used in the anthraquinone process, a major method in the industrial production of hydrogen peroxide. Thus, this statement is correct.
Hydrogen peroxide is used for the manufacture of sodium perborate.
- Sodium perborate is an important bleach that is manufactured using hydrogen peroxide. Therefore, this statement is also correct.

After evaluating all statements, it is clear that statements (a), (b), (c), and (d) are correct. Thus, the correct answer is:

(a), (b), (c) and (d)

List I (Spectral Lines of Hydrogen for transitions from)		List II (Wavelength (nm))
A.	n₂ = 3 to n₁ = 2	I.	410.2
B.	n₂ = 4 to n₁ = 2	II.	434.1
C.	n₂ = 5 to n₁ = 2	III.	656.3
D.	n₂ = 6 to n₁ = 2	IV.	486.1

The Correct Option is A

Solution and Explanation

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