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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.
| 2801. |
When a sulphur atom becomes a sulphide ion [AMU 1999] |
| A. | There is no change in the composition of atom |
| B. | It gains two electrons |
| C. | The mass number changes |
| D. | None of these |
| Answer» C. The mass number changes | |
| 2802. |
Incorrect statement regarding rusting is [MP PET 2000] |
| A. | Metallic iron is oxidised to \[F{{e}^{3+}}\]ions |
| B. | Metallic iron is reduced to \[F{{e}^{2-}}\] ions |
| C. | Oxygen gas is reduced to oxide ion |
| D. | Yellowish ? brown product is formed |
| Answer» C. Oxygen gas is reduced to oxide ion | |
| 2803. |
Oxidation involves [NCERT 1971, 81; CPMT 1980, 82, 83; MP PMT 1983] |
| A. | Loss of electrons |
| B. | Gain of electrons |
| C. | Increase in the valency of negative part |
| D. | Decrease in the valency of positive part |
| Answer» B. Gain of electrons | |
| 2804. |
\[SnC{{l}_{2}}\]gives a precipitate with a solution of \[HgC{{l}_{2}}.\]In this process \[HgC{{l}_{2}}\]is [CPMT 1983] |
| A. | Reduced |
| B. | Oxidised |
| C. | Converted into a complex compound containing both \[Sn\] and \[Hg\] |
| D. | Converted into a chloro complex of \[Hg\] |
| Answer» B. Oxidised | |
| 2805. |
Following reaction describes the rusting of iron \[4Fe+3{{O}_{2}}\,\to \,4F{{e}^{3+}}+6{{O}^{2-}}\] Which one of the following statement is incorrect [NCERT 1981; MNR 1991; AIIMS 1998] |
| A. | This is an example of a redox reaction |
| B. | Metallic iron is reduced to \[F{{e}^{3+}}\] |
| C. | \[F{{e}^{3+}}\] is an oxidising agent |
| D. | Metallic iron is a reducing agent |
| Answer» C. \[F{{e}^{3+}}\] is an oxidising agent | |
| 2806. |
In the reaction \[3Mg+{{N}_{2}}\to M{{g}_{3}}{{N}_{2}}\] [MP PMT 1999] |
| A. | Magnesium is reduced |
| B. | Magnesium is oxidized |
| C. | Nitrogen is oxidized |
| D. | None of these |
| Answer» C. Nitrogen is oxidized | |
| 2807. |
Max. number of moles of electrons taken up by one mole of \[NO_{3}^{-}\] when it is reduced to [DPMT 2002] |
| A. | \[N{{H}_{3}}\] |
| B. | \[N{{H}_{2}}OH\] |
| C. | \[NO\] |
| D. | \[N{{O}_{2}}\] |
| Answer» B. \[N{{H}_{2}}OH\] | |
| 2808. |
\[{{H}_{2}}{{O}_{2}}\]reduces \[{{K}_{4}}Fe{{(CN)}_{6}}\] [MP PMT 1985] |
| A. | In neutral solution |
| B. | In acidic solution |
| C. | In non-polar solvent |
| D. | In alkaline solution |
| Answer» C. In non-polar solvent | |
| 2809. |
\[{{H}_{2}}S\] reacts with halogens, the halogens [JIPMER 2000] |
| A. | Form sulphur halides |
| B. | Are oxidised |
| C. | Are reduced |
| D. | None of these |
| Answer» D. None of these | |
| 2810. |
Oxidation number of \[Mn\] in \[{{K}_{2}}Mn{{O}_{4}}\] and \[MnS{{O}_{4}}\] are respectively [CPMT 1997] |
| A. | + 7, + 2 |
| B. | + 6, + 2 |
| C. | + 5, + 2 |
| D. | + 2, + 6 |
| Answer» C. + 5, + 2 | |
| 2811. |
Nitrogen show different oxidation states in the range [Kerala (Med.) 2003] |
| A. | 0 to +5 |
| B. | - 3 to + 5 |
| C. | - 5 to + 3 |
| D. | - 3 to + 3 |
| Answer» C. - 5 to + 3 | |
| 2812. |
Oxidation state of \[Fe\] in \[F{{e}_{3}}{{O}_{4}}\] is [CBSE PMT 1999; AIIMS 2002] |
| A. | \[\frac{3}{2}\] |
| B. | \[\frac{4}{5}\] |
| C. | \[\frac{5}{4}\] |
| D. | \[\frac{8}{3}\] |
| Answer» E. | |
| 2813. |
The oxidation number of \[N\] in \[N{{H}_{4}}Cl\] is |
| A. | + 5 |
| B. | 3 |
| C. | - 5 |
| D. | -3 |
| Answer» E. | |
| 2814. |
When \[CuS{{O}_{4}}\] reacts with \[KI\], the oxidation number of \[Cu\] changes by [BHU 1997] |
| A. | 0 |
| B. | -1 |
| C. | 1 |
| D. | 2 |
| Answer» D. 2 | |
| 2815. |
What is the oxidation number of sulphur in \[N{{a}_{2}}{{S}_{4}}{{O}_{6}}\] [AIIMS 1998; DCE 1999] |
| A. | \[\frac{2}{3}\] |
| B. | \[\frac{3}{2}\] |
| C. | \[\frac{3}{5}\] |
| D. | \[\frac{5}{2}\] |
| Answer» E. | |
| 2816. |
Oxidation number of \[S\]in \[{{S}_{2}}C{{l}_{2}}\] is |
| A. | + 1 |
| B. | -1 |
| C. | + 6 |
| D. | 0 |
| Answer» B. -1 | |
| 2817. |
Carbon has zero oxidation number in [Kurukshetra CEE 2002] |
| A. | \[CO\] |
| B. | \[C{{H}_{4}}\] |
| C. | \[C{{H}_{2}}C{{l}_{2}}\] |
| D. | \[C{{H}_{3}}Cl\] |
| Answer» D. \[C{{H}_{3}}Cl\] | |
| 2818. |
Oxidation number of cobalt in \[K[Co{{(CO)}_{4}}]\] is [KCET 1996] |
| A. | + 1 |
| B. | 3 |
| C. | -1 |
| D. | -3 |
| Answer» D. -3 | |
| 2819. |
Oxidation number of sulphur in \[{{S}_{2}}O_{3}^{2-}\]is [CPMT 1979] |
| A. | - 2 |
| B. | 2 |
| C. | + 6 |
| D. | 0 |
| Answer» C. + 6 | |
| 2820. |
The element exhibiting most stable \[+\,2\] oxidation state among the following is [IIT 1995] |
| A. | \[Ag\] |
| B. | \[Fe\] |
| C. | \[Sn\] |
| D. | \[Pb\] |
| Answer» E. | |
| 2821. |
Oxygen has oxidation states of +2 in the [NCERT 1973; DPMT 1983; MP PET 2000] |
| A. | \[{{H}_{2}}{{O}_{2}}\] |
| B. | \[C{{O}_{2}}\] |
| C. | \[{{H}_{2}}O\] |
| D. | \[O{{F}_{2}}\] |
| Answer» E. | |
| 2822. |
When \[KMn{{O}_{4}}\]is reduced with oxalic acid in acidic solution, the oxidation number of \[Mn\] changes from [MNR 1987; MP PET 2000; CBSE PMT 2000; UPSEAT 2000, 02; BHU 2003; AMU 2002] |
| A. | 7 to 4 |
| B. | 6 to 4 |
| C. | 7 to 2 |
| D. | 4 to 2 |
| Answer» D. 4 to 2 | |
| 2823. |
Select the compound in which chlorine is assigned the oxidation number +5 [NCERT 1984, 94] |
| A. | \[HCl{{O}_{4}}\] |
| B. | \[HCl{{O}_{2}}\] |
| C. | \[HCl{{O}_{3}}\] |
| D. | \[HCl\] |
| Answer» D. \[HCl\] | |
| 2824. |
Oxidation numbers of two \[Cl\]atoms in bleaching powder, \[CaOC{{l}_{2}}\] are |
| A. | - 1, - 1 |
| B. | + 1, - 1 |
| C. | + 1, + 1 |
| D. | 0, - 1 |
| Answer» C. + 1, + 1 | |
| 2825. |
Oxidation state of ?S? in \[{{H}_{2}}S{{O}_{3}}\] [RPET 2003] |
| A. | + 3 |
| B. | + 6 |
| C. | + 4 |
| D. | + 2 |
| Answer» D. + 2 | |
| 2826. |
The oxidation state of \[Cr\] in \[C{{r}_{2}}O_{7}^{2-}\] is [BHU 2000; CPMT 2000] |
| A. | 4 |
| B. | -6 |
| C. | 6 |
| D. | -2 |
| Answer» D. -2 | |
| 2827. |
Oxidation number of carbon in \[C{{H}_{3}}-Cl\] is [MP PET 2000] |
| A. | - 3 |
| B. | -2 |
| C. | - 1 |
| D. | 0 |
| Answer» C. - 1 | |
| 2828. |
In \[Xe{{O}_{3}}\] and \[Xe{{F}_{6}}\] the oxidation state of Xe is [MP PET 2003] |
| A. | + 4 |
| B. | + 6 |
| C. | + 1 |
| D. | + 3 |
| Answer» C. + 1 | |
| 2829. |
In the chemical reaction \[C{{l}_{2}}+{{H}_{2}}S\to 2HCl+S\], the oxidation number of sulphur changes from [MP PMT 1999] |
| A. | 0 to 2 |
| B. | 2 to 0 |
| C. | - 2 to 0 |
| D. | - 2 to - 1 |
| Answer» D. - 2 to - 1 | |
| 2830. |
The oxidation number of \[Mn\]in \[N{{O}_{2}}\]is [CPMT 1982, 83; EAMCET 1992, 93; RPET 1999] |
| A. | + 7 |
| B. | -7 |
| C. | + 1 |
| D. | -1 |
| Answer» B. -7 | |
| 2831. |
The oxidation number and the electronic configuration of sulphur in \[{{H}_{2}}S{{O}_{4}}\]is [KCET 2002] |
| A. | + 4;\[1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{2}}\] |
| B. | + 2; \[1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{2}}3{{p}^{2}}\] |
| C. | + 3; \[1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{2}}3{{p}^{1}}\] |
| D. | + 6; \[1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}\] |
| Answer» E. | |
| 2832. |
The oxidation number of phosphorus in \[Ba{{({{H}_{2}}P{{O}_{2}})}_{2}}\] is [Kurukshetra CEE 1998; DCE 2004] |
| A. | - 1 |
| B. | 1 |
| C. | + 2 |
| D. | 3 |
| Answer» C. + 2 | |
| 2833. |
A compound is in its low oxidation state. Then its will be [DCE 2001] |
| A. | Highly acidic |
| B. | Highly basic |
| C. | Highest oxidising property |
| D. | Half acidic, half basic |
| Answer» D. Half acidic, half basic | |
| 2834. |
The oxidation number and covalency of sulphur in the sulphur molecule \[({{S}_{8}})\]are respectively [NCERT 1977] |
| A. | 0 and 2 |
| B. | 6 and 8 |
| C. | 0 and 8 |
| D. | 6 and 2 |
| Answer» B. 6 and 8 | |
| 2835. |
The oxidation number of nitrogen in \[N{{H}_{2}}OH\]is [NCERT 1981] |
| A. | + 1 |
| B. | -1 |
| C. | - 3 |
| D. | -2 |
| Answer» C. - 3 | |
| 2836. |
In ferrous ammonium sulphate oxidation number of \[Fe\]is [CPMT 1988] |
| A. | + 3 |
| B. | 2 |
| C. | + 1 |
| D. | -2 |
| Answer» C. + 1 | |
| 2837. |
Sulphur has lowest oxidation number in [EAMCET 1993] |
| A. | \[{{H}_{2}}S{{O}_{3}}\] |
| B. | \[S{{O}_{2}}\] |
| C. | \[{{H}_{2}}S{{O}_{4}}\] |
| D. | \[Ca,\,\,K,\,\,Li\] |
| Answer» E. | |
| 2838. |
In the conversion \[B{{r}_{2}}\,\to \,BrO_{3}^{-},\] the oxidation state of bromine changes from [EAMCET 1990; AMU 1999; RPMT 2002] |
| A. | - 1 to - 1 |
| B. | 0 to - 1 |
| C. | 0 to + 5 |
| D. | 0 to - 5 |
| Answer» D. 0 to - 5 | |
| 2839. |
Oxidation number of \[P\]in \[K{{H}_{2}}P{{O}_{2}}\] is [CPMT 1987; MH CET 1999] |
| A. | + 1 |
| B. | 3 |
| C. | + 5 |
| D. | -4 |
| Answer» B. 3 | |
| 2840. |
The oxidation state of nitrogen is highest in [MP PMT 2001; BHU 2002] |
| A. | \[{{N}_{3}}H\] |
| B. | \[N{{H}_{2}}OH\] |
| C. | \[{{N}_{2}}{{H}_{4}}\] |
| D. | \[N{{H}_{3}}\] |
| Answer» B. \[N{{H}_{2}}OH\] | |
| 2841. |
Oxidation number of \[P\]in \[M{{g}_{2}}{{P}_{2}}{{O}_{7}}\]is [CPMT 1989; MP PMT 1995] |
| A. | + 3 |
| B. | 2 |
| C. | + 5 |
| D. | -3 |
| Answer» D. -3 | |
| 2842. |
Oxidation state of oxygen in \[{{F}_{2}}O\]is [BHU 1982; UPSEAT 2001; MH CET 2002] |
| A. | + 1 |
| B. | + 2 |
| C. | \[-1\] |
| D. | \[-2\] |
| Answer» C. \[-1\] | |
| 2843. |
The brown ring complex compound is formulated as \[[Fe{{({{H}_{2}}O)}_{5}}NO]\,S{{O}_{4}}.\] The oxidation state of iron is [EAMCET 1987; IIT 1987; MP PMT 1994; AIIMS 1997; DCE 2000] |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 0 |
| Answer» C. 3 | |
| 2844. |
The oxidation number of iron in the compound \[{{K}_{4}}[Fe{{(CN)}_{6}}]\] is [NCERT 1976; MNR 1986; AIIMS 2000] |
| A. | + 6 |
| B. | + 4 |
| C. | + 3 |
| D. | + 2 |
| Answer» E. | |
| 2845. |
The atomic number of an element which shows the oxidation state of + 3 is [CPMT 1989, 94] |
| A. | 13 |
| B. | 32 |
| C. | 33 |
| D. | 17 |
| Answer» B. 32 | |
| 2846. |
Oxidation number of osmium \[(Os)\] in \[Os{{O}_{4}}\]is [AIIMS 1999] |
| A. | + 4 |
| B. | + 6 |
| C. | + 7 |
| D. | + 8 |
| Answer» E. | |
| 2847. |
In which of the following compounds transition metal is in oxidation state zero [NCERT 1982] |
| A. | \[[Co{{(N{{H}_{3}})}_{6}}]C{{l}_{2}}\] |
| B. | \[[Fe{{({{H}_{2}}O)}_{6}}S{{O}_{4}}]\] |
| C. | \[[Ni{{(CO)}_{4}}]\] |
| D. | \[[Fe{{({{H}_{2}}O)}_{3}}]{{(OH)}_{2}}\] |
| Answer» D. \[[Fe{{({{H}_{2}}O)}_{3}}]{{(OH)}_{2}}\] | |
| 2848. |
The valency of Cr in the complex \[{{[Cr{{({{H}_{2}}O)}_{4}}C{{l}_{2}}]}^{+}}\] [MP PMT 2000] |
| A. | 1 |
| B. | 3 |
| C. | 5 |
| D. | 6 |
| Answer» C. 5 | |
| 2849. |
The oxidation number of carbon in \[C{{H}_{2}}O\] is [IIT 1982; EAMCET 1985; MNR 1990; UPSEAT 2001 CPMT 1997, 2004] |
| A. | - 2 |
| B. | 2 |
| C. | 0 |
| D. | 4 |
| Answer» D. 4 | |
| 2850. |
The highest oxidation state of \[Mn\] is shown by [MNR 1983; RPMT 1999] |
| A. | \[{{K}_{2}}Mn{{O}_{4}}\] |
| B. | \[KMn{{O}_{4}}\] |
| C. | \[Mn{{O}_{2}}\] |
| D. | \[M{{n}_{2}}{{O}_{2}}\] |
| E. | \[MnO\] |
| Answer» C. \[Mn{{O}_{2}}\] | |