Which one of the following is correct for the given chemical equations? [A] \[{{H}^{2}}S+{{I}_{2}}\xrightarrow{{}}S+2HI\] [B] \[Mn{{O}_{2}}+4HCl\xrightarrow{{}}MnC{{l}_{2}}+2{{H}_{2}}O+C{{l}_{2}}\]

Only [A] is a redox reaction but [B] is not.

Only [B] is a redox reaction but [A] is not.

Natural fibres Synthetic fibres 1 3

\[{{I}_{2}}\]is the oxidising agent in [A], \[Mn{{O}_{2}}\] is the oxidising agent in [B].

Below two reactions are given. \[FeS{{O}_{4}}+Zn\xrightarrow{{}}ZnS{{O}_{4}}+Fe\] \[CuS{{O}_{4}}+Fe\xrightarrow{{}}FeS{{O}_{4}}+Cu\] The least reactive metal in the above reactions is:

(a)-2, (b)-1, (c)-4, (d)-5, (e)-3

Below four chemical equations are given. Identify the correct type of reaction for the given chemical equations. [A] \[CuS{{O}_{4}}+Zn\xrightarrow{{}}ZnS{{O}_{4}}+Cu\] [B] \[CaO+{{H}_{2}}O\xrightarrow{{}}Ca{{(OH)}_{2}}\] [C] \[2AgBr\xrightarrow{Light}2Ag+B{{r}_{2}}\] [D] \[4Fe+3{{O}_{2}}+2\times .{{H}_{2}}O\xrightarrow{{}}2F{{e}_{2}}{{O}_{3}}\times {{H}_{2}}O\]

A - decomposition, B - combination, C - redox, D - displacement.

A - displacement, B - combination, C - redox, D - decomposition.

These clothes absorb the heat and keep the body warm.

A - displacement, B - combination, C - decomposition, D - redox.

The reaction \[2Na+C{{l}_{2}}\to 2NaCl\] is an example of

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251.	Which one of the following is correct for the given chemical equations? [A] \[{{H}^{2}}S+{{I}_{2}}\xrightarrow{{}}S+2HI\] [B] \[Mn{{O}_{2}}+4HCl\xrightarrow{{}}MnC{{l}_{2}}+2{{H}_{2}}O+C{{l}_{2}}\]
A.	Only [A] is a redox reaction but [B] is not.
B.	Only [B] is a redox reaction but [A] is not.
C.	Natural fibres Synthetic fibres 1 3
D.	\[{{I}_{2}}\]is the oxidising agent in [A], \[Mn{{O}_{2}}\] is the oxidising agent in [B].
E.	None of these
Answer» E. None of these

Discussion

252.	Below two reactions are given. \[FeS{{O}_{4}}+Zn\xrightarrow{{}}ZnS{{O}_{4}}+Fe\] \[CuS{{O}_{4}}+Fe\xrightarrow{{}}FeS{{O}_{4}}+Cu\] The least reactive metal in the above reactions is:
A.	\[Fe\]
B.	\[Cu\]
C.	(a)-2, (b)-1, (c)-4, (d)-5, (e)-3
D.	\[S{{O}_{4}}\]
E.	None of these
Answer» C. (a)-2, (b)-1, (c)-4, (d)-5, (e)-3

Discussion

253.	Below four chemical equations are given. Identify the correct type of reaction for the given chemical equations. [A] \[CuS{{O}_{4}}+Zn\xrightarrow{{}}ZnS{{O}_{4}}+Cu\] [B] \[CaO+{{H}_{2}}O\xrightarrow{{}}Ca{{(OH)}_{2}}\] [C] \[2AgBr\xrightarrow{Light}2Ag+B{{r}_{2}}\] [D] \[4Fe+3{{O}_{2}}+2\times .{{H}_{2}}O\xrightarrow{{}}2F{{e}_{2}}{{O}_{3}}\times {{H}_{2}}O\]
A.	A - decomposition, B - combination, C - redox, D - displacement.
B.	A - displacement, B - combination, C - redox, D - decomposition.
C.	These clothes absorb the heat and keep the body warm.
D.	A - displacement, B - combination, C - decomposition, D - redox.
E.	None of these
Answer» E. None of these

Discussion

254.	The reaction \[2Na+C{{l}_{2}}\to 2NaCl\] is an example of
A.	combination reaction
B.	decomposition reaction
C.	1 2 3 4 Natural Gardener Plumber Phiran
D.	double decomposition reaction
Answer» B. decomposition reaction

Discussion

255.	When zinc is added to \[CuS{{O}_{4}}\] solution, copper is precipitated because
A.	\[C{{u}^{+2}}\] is reduced
B.	\[C{{u}^{+2}}\] is oxidised
C.	Mundu and Neriyathu
D.	\[CuS{{O}_{4}}\]is hydrolysed
Answer» B. \[C{{u}^{+2}}\] is oxidised

Discussion

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Explore topic-wise MCQs in Science.

Which one of the following is correct for the given chemical equations? [A] \[{{H}^{2}}S+{{I}_{2}}\xrightarrow{{}}S+2HI\] [B] \[Mn{{O}_{2}}+4HCl\xrightarrow{{}}MnC{{l}_{2}}+2{{H}_{2}}O+C{{l}_{2}}\]

Below two reactions are given. \[FeS{{O}_{4}}+Zn\xrightarrow{{}}ZnS{{O}_{4}}+Fe\] \[CuS{{O}_{4}}+Fe\xrightarrow{{}}FeS{{O}_{4}}+Cu\] The least reactive metal in the above reactions is:

The reaction \[2Na+C{{l}_{2}}\to 2NaCl\] is an example of

When zinc is added to \[CuS{{O}_{4}}\] solution, copper is precipitated because