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MCQOPTIONS
This section includes 11242 Mcqs, each offering curated multiple-choice questions to sharpen your Joint Entrance Exam - Main (JEE Main) knowledge and support exam preparation. Choose a topic below to get started.
| 2751. |
Which of the following behaves as both oxidising and reducing agents [AFMC 1995] |
| A. | \[{{H}_{2}}S{{O}_{4}}\] |
| B. | \[S{{O}_{2}}\] |
| C. | \[{{H}_{2}}S\] |
| D. | \[HN{{O}_{3}}\] |
| Answer» C. \[{{H}_{2}}S\] | |
| 2752. |
Several blocks of magnesium are fixed to the bottom of a ship to [AIEEE 2003] |
| A. | Keep away the sharks |
| B. | Make the ship lighter |
| C. | Prevent action of water and salt |
| D. | Prevent puncturing by under-sea rocks |
| Answer» D. Prevent puncturing by under-sea rocks | |
| 2753. |
Identify the correct statement about \[{{H}_{2}}{{O}_{2}}\] [AIIMS 1996] |
| A. | It acts as reducing agent only |
| B. | It acts as both oxidising and reducing agent |
| C. | It is neither an oxidiser nor reducer |
| D. | It acts as oxidising agent only |
| Answer» C. It is neither an oxidiser nor reducer | |
| 2754. |
Of the four oxyacids of chlorine the strongest oxidising agent in dilute aqueous solution is [MP PET 2000] |
| A. | \[HCl{{O}_{4}}\] |
| B. | \[HCl{{O}_{3}}\] |
| C. | \[HCl{{O}_{2}}\] |
| D. | \[HOCl\] |
| Answer» E. | |
| 2755. |
Which of the following is the most powerful oxidizing agent [MNR 1990; CPMT 2003] |
| A. | \[{{F}_{2}}\] |
| B. | \[C{{l}_{2}}\] |
| C. | \[B{{r}_{2}}\] |
| D. | \[{{I}_{2}}\] |
| Answer» B. \[C{{l}_{2}}\] | |
| 2756. |
In the reaction \[P+NaOH\to P{{H}_{3}}+Na{{H}_{2}}P{{O}_{2}}\] [MP PET 2004] |
| A. | P is oxidised only |
| B. | P is reduced only |
| C. | P is oxidized as well as reduced |
| D. | \[Na\] is reduced |
| Answer» D. \[Na\] is reduced | |
| 2757. |
Which of the following substances acts as an oxidising as well as a reducing agent [UPSEAT 2004; DCE 2004] |
| A. | \[N{{a}_{2}}O\] |
| B. | \[SnC{{l}_{2}}\] |
| C. | \[N{{a}_{2}}{{O}_{2}}\] |
| D. | \[NaN{{O}_{2}}\] |
| Answer» E. | |
| 2758. |
In the reaction \[HAs{{O}_{2}}+S{{n}^{2+}}\to As+S{{n}^{4+}}+{{H}_{2}}O\] oxidising agent is [BVP 2004] |
| A. | \[S{{n}^{2+}}\] |
| B. | \[S{{n}^{4+}}\] |
| C. | \[As\] |
| D. | \[HAs{{O}_{2}}\] |
| Answer» E. | |
| 2759. |
A reducing agent is a substance which can [CPMT 1971, 74, 76, 78, 80; NCERT 1976] |
| A. | Accept electron |
| B. | Donate electrons |
| C. | Accept protons |
| D. | Donate protons |
| Answer» C. Accept protons | |
| 2760. |
In the reaction \[A{{g}_{2}}O+{{H}_{2}}{{O}_{2}}\to 2Ag+{{H}_{2}}O+{{O}_{2}}\], the \[{{H}_{2}}{{O}_{2}}\] acts as [BHU 2004] |
| A. | Reducing agent |
| B. | Oxidising agent |
| C. | Bleaching agent |
| D. | None of the above |
| Answer» B. Oxidising agent | |
| 2761. |
What is the oxidising agent in chlorine water [JEE Orissa 2004] |
| A. | \[HCl\] |
| B. | \[HCl{{O}_{2}}\] |
| C. | \[HOCl\] |
| D. | None of these |
| Answer» D. None of these | |
| 2762. |
Which is the best description of the behaviour of bromine in the reaction given below \[{{H}_{2}}O+B{{r}_{2}}\to HOBr+HBr\] [CBSE PMT 2004] |
| A. | Oxidised only |
| B. | Reduced only |
| C. | Proton acceptor only |
| D. | Both oxidised and reduced |
| Answer» E. | |
| 2763. |
Which one is oxidising agent in the reaction below \[2CrO_{4}^{2-}+2{{H}^{+}}\to C{{r}_{2}}O_{7}^{2-}+{{H}_{2}}O\] [CPMT 1997] |
| A. | \[{{H}^{+}}\] |
| B. | \[C{{r}_{2}}O_{4}^{-}\] |
| C. | \[C{{r}^{++}}\] |
| D. | None of these |
| Answer» E. | |
| 2764. |
The compound that can work both as oxidising and reducing agent is [CPMT 1986; MP PET 2000] |
| A. | \[KMn{{O}_{4}}\] |
| B. | \[{{H}_{2}}{{O}_{2}}\] |
| C. | \[Ba{{O}_{2}}\] |
| D. | \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] |
| Answer» C. \[Ba{{O}_{2}}\] | |
| 2765. |
Which one is oxidising substance [CPMT 1997] |
| A. | \[{{C}_{2}}{{H}_{2}}{{O}_{2}}\] |
| B. | \[CO\] |
| C. | \[{{H}_{2}}S\] |
| D. | \[C{{O}_{2}}\] |
| Answer» E. | |
| 2766. |
Which of the following acid possesses oxidising, reducing and complex forming properties [MNR 1985] |
| A. | \[HN{{O}_{3}}\] |
| B. | \[{{H}_{2}}S{{O}_{4}}\] |
| C. | \[HCl\] |
| D. | \[HN{{O}_{2}}\] |
| Answer» E. | |
| 2767. |
Which substance is serving as a reducing agent in the following reaction \[14{{H}^{+}}+C{{r}_{2}}O_{7}^{2-}+3Ni\to 2C{{r}^{3+}}+7{{H}_{2}}O+3N{{i}^{2+}}\] [CBSE PMT 1994; AFMC 2000; DPMT 2001] |
| A. | \[{{H}_{2}}O\] |
| B. | \[Ni\] |
| C. | \[{{H}^{+}}\] |
| D. | \[C{{r}_{2}}O_{7}^{2-}\] |
| Answer» C. \[{{H}^{+}}\] | |
| 2768. |
Strongest reducing agent is [MNR 1984, 89] |
| A. | \[K\] |
| B. | \[Mg\] |
| C. | \[Al\] |
| D. | \[Br\] |
| E. | \[Na\] |
| Answer» B. \[Mg\] | |
| 2769. |
When \[NaCl\] is dissolved in water the sodium ion becomes [NCERT 1976] |
| A. | Oxidised |
| B. | Reduced |
| C. | Hydrolysed |
| D. | Hydrated |
| Answer» E. | |
| 2770. |
In the reaction \[{{C}_{2}}O_{4}^{2-}+MnO_{4}^{-}+{{H}^{+}}\,\to \,M{{n}^{2+}}+C{{O}_{2}}+{{H}_{2}}O\] the reductant is [EAMCET 1991] |
| A. | \[{{C}_{2}}O_{4}^{2-}\] |
| B. | \[MnO_{4}^{-}\] |
| C. | \[M{{n}^{2+}}\] |
| D. | \[{{H}^{+}}\] |
| Answer» B. \[MnO_{4}^{-}\] | |
| 2771. |
In which of the following reactions \[{{H}_{2}}{{O}_{2}}\]is a reducing agent [CPMT 1981; NCERT 1981; BHU 1999] |
| A. | \[2FeC{{l}_{2}}+2HCl+{{H}_{2}}{{O}_{2}}\,\to \,2FeC{{l}_{3}}+2{{H}_{2}}O\] |
| B. | \[C{{l}_{2}}+{{H}_{2}}{{O}_{2}}\,\,\to \,\,2HCl+{{O}_{2}}\] |
| C. | \[2HI+{{H}_{2}}{{O}_{2}}\,\to \,\,2{{H}_{2}}O+{{I}_{2}}\] |
| D. | \[{{H}_{2}}S{{O}_{3}}+{{H}_{2}}{{O}_{2}}\,\to \,\,{{H}_{2}}S{{O}_{4}}+{{H}_{2}}O\] |
| Answer» C. \[2HI+{{H}_{2}}{{O}_{2}}\,\to \,\,2{{H}_{2}}O+{{I}_{2}}\] | |
| 2772. |
Which one is an oxidising agent [DPMT 1996] |
| A. | \[FeS{{O}_{4}}\] |
| B. | \[HN{{O}_{3}}\] |
| C. | \[FeS{{O}_{4}}.{{(N{{H}_{4}})}_{2}}S{{O}_{4}}.6{{H}_{2}}O\] |
| D. | \[{{H}_{2}}S{{O}_{4}}\] |
| Answer» C. \[FeS{{O}_{4}}.{{(N{{H}_{4}})}_{2}}S{{O}_{4}}.6{{H}_{2}}O\] | |
| 2773. |
The strongest reducing agent is [MNR 1982] |
| A. | \[HN{{O}_{2}}\] |
| B. | \[{{H}_{2}}S\] |
| C. | \[{{H}_{2}}S{{O}_{3}}\] |
| D. | \[SnC{{l}_{2}}\] |
| Answer» C. \[{{H}_{2}}S{{O}_{3}}\] | |
| 2774. |
Strongest reducing agent is [CPMT 1977; BHU 1984, 96; MP PET 1990; AMU 1999] |
| A. | \[{{F}^{-}}\] |
| B. | \[C{{l}^{-}}\] |
| C. | \[B{{r}^{-}}\] |
| D. | \[{{I}^{-}}\] |
| Answer» E. | |
| 2775. |
A solution of sulphur dioxide in water reacts with \[{{H}_{2}}S\] precipitating sulphur. Here sulphur dioxide acts as [NCERT 1980] |
| A. | As oxidising agent |
| B. | A reducing agent |
| C. | An acid |
| D. | A catalyst |
| Answer» B. A reducing agent | |
| 2776. |
In \[C+{{H}_{2}}O\,\to \,\,CO+{{H}_{2}},\,\,{{H}_{2}}O\] acts as [AFMC 1988] |
| A. | Oxidising agent |
| B. | Reducing agent |
| C. | A and B both |
| D. | None of these |
| Answer» B. Reducing agent | |
| 2777. |
\[{{H}_{2}}{{O}_{2}}\] is used as [CPMT 1994] |
| A. | An oxidant only |
| B. | A reductant only |
| C. | An acid only |
| D. | An oxidant, a reductant and an acid |
| Answer» E. | |
| 2778. |
Which of the following is not a reducing agent [EAMCET 1987] |
| A. | \[NaN{{O}_{2}}\] |
| B. | \[NaN{{O}_{3}}\] |
| C. | \[HI\] |
| D. | \[SnC{{l}_{2}}\] |
| Answer» C. \[HI\] | |
| 2779. |
Equation \[{{H}_{2}}S+{{H}_{2}}{{O}_{2}}\to S+2{{H}_{2}}O\] represents [UPSEAT 2001] |
| A. | Acidic nature of\[{{H}_{2}}{{O}_{2}}\] |
| B. | Basic nature of \[{{H}_{2}}{{O}_{2}}\] |
| C. | Oxidising nature of \[{{H}_{2}}{{O}_{2}}\] |
| D. | Reducing nature of \[{{H}_{2}}{{O}_{2}}\] |
| Answer» D. Reducing nature of \[{{H}_{2}}{{O}_{2}}\] | |
| 2780. |
\[2CuI\,\to Cu+Cu{{I}_{2}}\], the reaction is [RPMT 1997] |
| A. | Redox |
| B. | Neutralisation |
| C. | Oxidation |
| D. | Reduction |
| Answer» B. Neutralisation | |
| 2781. |
In the course of a chemical reaction an oxidant [MP PMT 1986] |
| A. | Loses electrons |
| B. | Gains electrons |
| C. | Both loses and gains electron |
| D. | Electron change takes place |
| Answer» C. Both loses and gains electron | |
| 2782. |
Which one of the following does not get oxidised by bromine water [MP PET/PMT 1988] |
| A. | \[F{{e}^{+2}}\] to \[F{{e}^{+3}}\] |
| B. | \[C{{u}^{+}}\] to \[C{{u}^{+2}}\] |
| C. | \[M{{n}^{+2}}\] to \[MnO_{4}^{-}\] |
| D. | \[S{{n}^{+2}}\] to \[S{{n}^{+4}}\] |
| Answer» D. \[S{{n}^{+2}}\] to \[S{{n}^{+4}}\] | |
| 2783. |
When \[P\] reacts with caustic soda, the products are \[P{{H}_{3}}\] and \[Na{{H}_{2}}P{{O}_{2}}.\] This reaction is an example of [IIT 1980; Kurukshetra CEE 1993; CPMT 1997] |
| A. | Oxidation |
| B. | Reduction |
| C. | Oxidation and reduction (Redox) |
| D. | Neutralization |
| Answer» D. Neutralization | |
| 2784. |
Which of the following is redox reaction [CBSE PMT 1997] |
| A. | \[{{H}_{2}}S{{O}_{4}}\] with \[NaOH\] |
| B. | In atmosphere, \[{{O}_{3}}\] from \[{{O}_{2}}\] by lightning |
| C. | Evaporation of \[{{H}_{2}}O\] |
| D. | Nitrogen oxides form nitrogen and oxygen by lightning |
| Answer» E. | |
| 2785. |
In the reaction, \[4Fe+3{{O}_{2}}\to 4F{{e}^{3+}}+6{{O}^{2-}}\] which of the following statement is incorrect [UPSEAT 2001, 02] |
| A. | A Redox reaction |
| B. | Metallic iron is a reducing agent |
| C. | \[F{{e}^{3+}}\]is an oxidising agent |
| D. | Metallic iron is reduced to \[F{{e}^{3+}}\] |
| Answer» E. | |
| 2786. |
When iron or zinc is added to \[CuS{{O}_{4}}\] solution, copper is precipitated. It is due to [CPMT 1974, 79] |
| A. | Oxidation of \[C{{u}^{+2}}\] |
| B. | Reduction of \[C{{u}^{+2}}\] |
| C. | Hydrolysis of \[CuS{{O}_{4}}\] |
| D. | Ionization of \[CuS{{O}_{4}}\] |
| Answer» C. Hydrolysis of \[CuS{{O}_{4}}\] | |
| 2787. |
In acid solution, the reaction \[MnO_{4}^{-}\,\to \,M{{n}^{2+}}\] involves [MP PMT 1989] |
| A. | Oxidation by 3 electrons |
| B. | Reduction by 3 electrons |
| C. | Oxidation by 5 electrons |
| D. | Reduction by 5 electrons |
| Answer» E. | |
| 2788. |
Which halide is not oxidised by \[Mn{{O}_{2}}\] [MNR 1985; JIPMER 2000] |
| A. | \[F\] |
| B. | \[Cl\] |
| C. | \[Br\] |
| D. | \[I\] |
| Answer» B. \[Cl\] | |
| 2789. |
When \[F{{e}^{2+}}\] changes to \[F{{e}^{3+}}\] in a reaction |
| A. | It loses an electron |
| B. | It gains an electron |
| C. | It loses a proton |
| D. | It gains a proton |
| Answer» B. It gains an electron | |
| 2790. |
In the following reaction \[C{{r}_{2}}O_{7}^{-}+14{{H}^{+}}+6{{I}^{-}}\to \,\]\[2C{{r}^{3+}}+3{{H}_{2}}O+3{{I}_{2}}\] Which element is reduced [CPMT 1976] |
| A. | \[Cr\] |
| B. | \[H\] |
| C. | \[O\] |
| D. | \[I\] |
| Answer» B. \[H\] | |
| 2791. |
The ultimate products of oxidation of most of hydrogen and carbon in food stuffs are [DCE 2001] |
| A. | \[{{H}_{2}}O\] alone |
| B. | \[C{{O}_{2}}\]alone |
| C. | \[{{H}_{2}}O\] and \[C{{O}_{2}}\] |
| D. | None of these |
| Answer» D. None of these | |
| 2792. |
In the following reaction, \[4P+3KOH+3{{H}_{2}}O\to 3K{{H}_{2}}P{{O}_{2}}+P{{H}_{3}}\] [Pb. PMT 2002] |
| A. | P is oxidized as well as reduced |
| B. | P is reduced only |
| C. | P is oxidised only |
| D. | None of these |
| Answer» B. P is reduced only | |
| 2793. |
In the following reaction, \[3B{{r}_{2}}+6CO_{3}^{2-}+3{{H}_{2}}O=5B{{r}^{-}}+BrO_{3}^{-}+6HC{{O}_{3}}\] [MP PMT 1994, 95] |
| A. | Bromine is oxidised and carbonate is reduced |
| B. | Bromine is reduced and water is oxidised |
| C. | Bromine is neither reduced nor oxidised |
| D. | Bromine is both reduced and oxidized |
| Answer» E. | |
| 2794. |
In a reaction between zinc and iodine, in which zinc iodide is formed, what is being oxidised [NCERT 1975] |
| A. | Zinc ions |
| B. | Iodide ions |
| C. | Zinc atom |
| D. | Iodine |
| Answer» D. Iodine | |
| 2795. |
Reduction involves NCERT 1972] |
| A. | Loss of electrons |
| B. | Gain of electrons |
| C. | Increase in the valency of positive part |
| D. | Decrease in the valency of negative part |
| Answer» C. Increase in the valency of positive part | |
| 2796. |
Oxidation of thiosulphate \[2{{H}_{2}}(g)+{{O}_{2}}(g)\to 2{{H}_{2}}O(l)\]ion by iodine gives [NCERT 1976] |
| A. | \[(mol.\,\,wt.\,=M)\] |
| B. | \[SO_{4}^{2-}\] |
| C. | \[{{S}_{4}}O_{6}^{2-}\] |
| D. | \[{{S}_{2}}O_{6}^{2-}\] |
| Answer» D. \[{{S}_{2}}O_{6}^{2-}\] | |
| 2797. |
One gas bleaches the colour of flowers by reduction while the other by oxidation [EAMCET 1980] |
| A. | \[CO\] and \[C{{l}_{2}}\] |
| B. | \[S{{O}_{2}}\] and \[C{{l}_{2}}\] |
| C. | \[{{H}_{2}}S\] and \[B{{r}_{2}}\] |
| D. | \[N{{H}_{3}}\] and \[S{{O}_{2}}\] |
| Answer» C. \[{{H}_{2}}S\] and \[B{{r}_{2}}\] | |
| 2798. |
\[Z{{n}^{2+}}(aq)+2e\,\to \,Zn(s).\] This is [CPMT 1985] |
| A. | Oxidation |
| B. | Reduction |
| C. | Redox reaction |
| D. | None of these |
| Answer» C. Redox reaction | |
| 2799. |
When \[S{{n}^{2+}}\]changes to \[S{{n}^{4+}}\]in a reaction [CPMT 1981] |
| A. | It loses two electrons |
| B. | It gains two electrons |
| C. | It loses two protons |
| D. | It gains two protons |
| Answer» B. It gains two electrons | |
| 2800. |
Solution of sodium metal in liquid ammonia is strongly reducing due to the presence of the following in the solution [NCERT 1977; KCET (Med.) 2000] |
| A. | Sodium atoms |
| B. | Solvated electrons |
| C. | Sodium hydride |
| D. | Sodium amide |
| Answer» C. Sodium hydride | |