What is the alteration in the oxidation state of carbon in the given reaction?

\(\mathrm{{CH_4}_{(g)} + 4{Cl_2}_{(g)} \rightarrow {CCl_4}_{(l)} + 4 HCl_{(g)}}\)

1.	0 to +4	2.	–4 to +4
3.	0 to –4	4.	+4 to +4

Which of the following does not represent a redox reaction?

1. Cr₂O₇^2- + 2OH^- $\to \hspace{0.17em}$CrO₄^2- + H₂O

2. SO₄^2- + 2I^- + 2H⁺ $\to \hspace{0.17em}$I₂ + H₂S + H₂O

3. Ca + 2H₂O → Ca(OH)₂ + H₂

4. PCl₅ $\to \hspace{0.17em}$PCl₃ + Cl₂

An atom is said to be in the +6 oxidation state when it has effectively lost six electrons.
Which of the following species contains such an atom?

1. MnO₄^-

2. Cr(CN)₆^3-

3. NiF₆^2-

4. CrO₂Cl₂

The oxidation number of the atom (in bold) in the following species is given. Identify, which one is incorrectly related?

1. \(\mathbf{Cu}_{2} O\) is \(- 1\)

2. \(\mathbf{Cl} O_{3}^{-}\) is \(+ 5\)

3. \(K_{2} \mathbf{Cr}_{2} O_{7}\) is \(+ 6\)

4. \(H \mathbf{Au} Cl_{4}\) is \(+ 3\)

The oxidation number and covalency of sulphur in the sulphur molecule (S₈) are respectively:

1. 0, and 2

2. +6, and 8

3. 0, and 8

4. +6, and 2

Among the following the correct order of acidity is-

1. HClO < HClO₂< HClO₃< HClO₄
2. HClO₂< HClO < HClO₃< HClO₄
3. HClO₄< HClO₂< HClO < HClO₃
4. HClO₃< HClO₄< HClO₂< HClO

In the given reaction, what is the name of the species that bleaches the substances due to its oxidising action?
Cl₂(g) + 2OH^-(aq) → ClO^-(aq) + Cl^-(aq) + H₂O(l)

1. ClO^- 

2. Cl₂

3. Cl^-

4. Both ClO^- and Cl^-

The oxidation state of P in ${\mathrm{HPO}}_3^{2-}$ is-

The oxidation state of two S-atoms in ${\mathrm{Na}}_2{\mathrm{S}}_2{\mathrm{O}}_3$ is:

1. +2 and +4

2. +3 and -2

3. +4 and -2

4. +6 and -2