Question

Q9. Which of the following substance cannot be broken down by a chemical
method?
(1)
(a) Ammonia(NH) (b) Helium(He) (c) Methane(CH) (d)Water(H2O)​

Answer 1

Answer:

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Explanation:

Elements are chemically the simplest substances and hence, cannot be broken down using chemical methods. But Ammonia, methane and water are compounds that can be decomposed further into their elements.

Answer 2

Answer: All four substances listed in the options, Ammonia (NH3), Helium (He), Methane (CH4), and Water (H2O), can be broken down through chemical reactions.

Explanation:

Ammonia (NH3) can be decomposed into nitrogen (N2) and hydrogen (H2) by using heat or by using a catalyst. The reaction can be represented as:

NH3 -> N2 + 3H2

Helium (He) is an unreactive gas and is considered to be chemically inert. It does not participate in chemical reactions under normal conditions.

Methane (CH4) can be broken down through oxidation, where oxygen (O2) reacts with methane to form carbon dioxide (CO2) and water (H2O). The reaction can be represented as:

CH4 + 2O2 -> CO2 + 2H2O

Water (H2O) can be broken down into hydrogen (H2) and oxygen (O2) through electrolysis, which involves passing an electric current through water. The reaction can be represented as:

2H2O -> 2H2 + O2

Overall, none of the substances listed in the options cannot be broken down through chemical reactions. However, Helium is considered to be chemically inert and does not participate in chemical reactions under normal conditions.

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