What is the change in oxidation number of carbon in the following reaction ?
\(\text{CH}_4\text{(g)} \,+\, \text{4Cl}_2\text{(g)} \, \rightarrow \, \text{CCl}_4\text{(i)}\, +\, \text{4HCl(g)}\)

(1). 0 to +4
(2). -4 to +4
(3). 0 to -4
(4). +4 to +4

Number of Attempts: 2

Correct Attempts: 1

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Average Time: 00:02

Consider the following compounds:
\(\text{K0}_2\), \(\text{H}_2\text{0}_2\) and \(\text{H}_2\text{SO}_4\)
The oxidation states of the underlined elements in them are, respectively,

(1). +4, -4, and +6
(2). +1, -1, and +6
(3). +2, -2, and +6
(4). +1, -2, and +4

Number of Attempts: 2

Correct Attempts: 1

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Average Time: 00:02

Among group 16 elements, which one does NOT show -2 oxidation state

(1). Te
(2). Po
(3). O
(4). Se

Number of Attempts: 2

Correct Attempts: 1

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Which is NOT a redox reaction?

(1). \(\text{H}_2\,+\,\text{Cl}_2\,\rightarrow\,2\text{HCl}\)
(2). \(\text{BaCl}_2\,+\,\text{Na}_2\text{SO}_4\,\rightarrow\,\text{BaSO}_4\,+\,2\text{NaCl}\)
(3). \(\text{Zn}\,+\,\text{CuSO}_4\,\rightarrow\,\text{ZnSO}_4\,+\,\text{Cu}\)
(4). \(2\text{KClO}_3\,+\,\text{I}_2\,\rightarrow\,2\text{KIO}_3\,+\,\text{Cl}_2\)

Number of Attempts: 2

Correct Attempts: 1

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Average Time: 00:02

On balancing the given redox reaction,

the coefficients a, b and c are found to be, respectively

(1). 3, 8, 1
(2). 1, 8, 3
(3). 8, 1, 3
(4). 1, 3, 8

Number of Attempts: 2

Correct Attempts: 1

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Which of the following reactions is the metal displacement reaction? Choose the right option.

(1).
(2).
(3).
(4).

Number of Attempts: 2

Correct Attempts: 1

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Which of the following reactions are disproportionation reaction ?

Select the correct option from the following:

(1). (i), (ii), and (iii)
(2). (i), (iii), and (iv)
(3). (i) and (iv) only
(4). (i) and (ii) only

Number of Attempts: 2

Correct Attempts: 1

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Average Time: 00:02

Consider the change in oxidation state of Bromine corresponding to different emf values as shown in the diagram below

Then the species undergoing dispro-portionation is

(1). \(\text{HB}_rO\)
(2). \(\text{Br}_2\)
(3). \(\text{BrO}_4^-\)
(4). \(\text{BrO}_3^-\)

Number of Attempts: 2

Correct Attempts: 1

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The correct order of N-compounds in its decreasing order of oxidation states is

(1). NH₄Cl, N₂, NO, HNO₃
(2). HNO₃, NH₄Cl, NO, N₂
(3). HNO₃, NO, NH₄Cl, N₂
(4). HNO₃ , NO, N₂ , NH₄Cl

Number of Attempts: 2

Correct Attempts: 1

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Average Time: 00:02

For the redox reaction

The correct coefficients of the reactants for the balanced equation are

(1). \(\text{MNO}_4^- \rightarrow \) 5, \(\text{C}_2 \text{O}_4^{2-} \rightarrow \) 16, \(\text{H1}^+ \rightarrow \) 2
(2). \(\text{MNO}_4^- \rightarrow \) 2, \(\text{C}_2 \text{O}_4^{2-} \rightarrow \) 16, \(\text{H1}^+ \rightarrow \) 5
(3). \(\text{MNO}_4^- \rightarrow \) 2, \(\text{C}_2 \text{O}_4^{2-} \rightarrow \) 5, \(\text{H1}^+ \rightarrow \) 16
(4). \(\text{MNO}_4^- \rightarrow \) 16, \(\text{C}_2 \text{O}_4^{2-} \rightarrow \) 5, \(\text{H1}^+ \rightarrow \) 2

Number of Attempts: 2

Correct Attempts: 1

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Name the gas that can readily decolourizes acidified KMnO₄ solution.

(1). P₂O₅
(2). CO₂
(3). SO₂
(4). NO₂

Number of Attempts: 2

Correct Attempts: 1

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Average Time: 00:02

In which pair of ions both the species contain S – S bond ?

(1). \(\text{S}_4 O_6^{2-}\), \(\text{S}_2 O_7^{2-}\)
(2). \(\text{S}_2 O_7^{2-}\), \(\text{S}_2 O_3^{2-}\)
(3). \(\text{S}_4 O_6^{2-}\), \(\text{S}_2 O_3^{2-}\)
(4). \(\text{S}_2 O_7^{2-}\), \(\text{S}_2 O_8^{2-}\)

Number of Attempts: 2

Correct Attempts: 1

Time Taken: 00:04

Average Time: 00:02