Question

(1) Which of the following reactions is a decomposition reaction?
(a) NaOH + HCl-NaCl + H2O
(b) NHACNOHNCONH,
© 2KClO, -2KCl + 302
(d) H2+1242H1
(ii) 2Pb(NO3)2-2PbO + NA + O2
What is nA in the given reaction?
(a) 4NO
(b) 4NO2
(c) 2PbNO2
(d) NO2
(iii) Amino acid is formed by the decomposition of which component of our diet?
(a) Carbohydrate (b) Starch
(c) Protein
(d) Fat
(iv) Silver chloride on exposure to sunlight for a long duration turns grey due to
(I) the formation of silver by decomposition of silver chloride
(II) sublimation of silver chloride
(III) decomposition of chlorine gas from silver chloride
(IV)oxidation of silver chloride
The correct statement(s) is/are
(a) Only (I)
(b) Only (II) and (III) (c) Only (I) and (II) (d) Only (IV)
(v) What type of chemical reaction takes place when electricity is passed through water?
(a) Thermal decomposition
(b) Electrolytic decomposition
(C) Photochemical decomposition
(d) Displacement reaction​

Answer 1

Answer:

The required answers to the given questions are as follows:

1) $2KCLO_3 \rightarrow 2KCL+3O_2$

2) $4NO_2$

3) Proteins

4) Only (I) Formation of silver due to decomposition of silver chloride.

5) Electrolytic decomposition.

Explanation:

The explanations for the questions are given below:

1. Degradation (decomposition) reactions are happening around us, but we often don't notice them. Here are some common examples of decomposition reactions:

• Decomposition of carbonic acid in soft drinks
• Decomposition into hydrogen and oxygen by electrolysis of water.

2. The chemical formula is given by:

$2Pb(NO_3)_2(s)\rightarrow 2PbO (s)+4NO_2(g)+O_2 (g)$

When heated, lead (II) nitrate crystals decompose into lead (II) oxide, oxygen, and the brown fumes of nitrogen dioxide are visible.

3. Amino acids are made up of proteins. When proteins are broken down, amino acids are produced.

4. Silver chloride decomposes into metallic silver and chlorine gas when exposed to light. The white color of silver chloride turns gray due to the formation of silver metal.

5. Electrolytic decomposition reaction is a decomposition reaction in which  Decomposition's activation energy is provided in the form of electric energy. The example of an decomposition electrolytic reaction is the electrolysis of water.

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