MCQOPTIONS
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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.
| 2851. |
The oxidation states of the most electronegative element in the products of the reaction of \[Ba{{O}_{2}}\]with dilute \[{{H}_{2}}S{{O}_{4}}\] are [IIT 1991; CBSE PMT 1992; BHU 2000] |
| A. | 0 and - 1 |
| B. | - 1 and - 2 |
| C. | - 2 and 0 |
| D. | - 2 and + 1 |
| Answer» C. - 2 and 0 | |
| 2852. |
When \[S{{O}_{2}}\] is passed through acidic solution of potassium dichromate, then chromium sulphate is formed. Change in valency of chromium is [CPMT 1979] |
| A. | +4 to +2 |
| B. | +5 to +3 |
| C. | +6 to +3 |
| D. | +7 to +2 |
| Answer» D. +7 to +2 | |
| 2853. |
The oxidation number of hydrogen in \[M{{H}_{2}}\]is [CPMT 1976] |
| A. | + 1 |
| B. | -1 |
| C. | + 2 |
| D. | -2 |
| Answer» C. + 2 | |
| 2854. |
In which of the following compounds iron has lowest oxidation state [MNR 1984] |
| A. | \[FeS{{O}_{4}}.{{(N{{H}_{4}})}_{2}}S{{O}_{4}}.6{{H}_{2}}O\] |
| B. | \[{{K}_{4}}Fe{{(CN)}_{6}}\] |
| C. | \[Fe{{(CO)}_{5}}\] |
| D. | \[F{{e}_{2}}O\] |
| E. | \[{{K}_{2}}Fe{{O}_{4}}\] |
| Answer» D. \[F{{e}_{2}}O\] | |
| 2855. |
Oxidation number of \[C\] in \[{{C}_{6}}{{H}_{12}}{{O}_{6}}\]is [KCET 1992] |
| A. | + 6 |
| B. | -6 |
| C. | 0 |
| D. | 4 |
| Answer» D. 4 | |
| 2856. |
Chlorine is in +1 oxidation state in [MP PMT 1981; NCERT 1974; CPMT 1971, 78] |
| A. | \[HCl\] |
| B. | \[HCl{{O}_{4}}\] |
| C. | \[ICl\] |
| D. | \[C{{l}_{2}}O\] |
| Answer» E. | |
| 2857. |
The characteristic oxidation number of atoms in free metals is [NCERT 1975] |
| A. | Minus one |
| B. | Any number |
| C. | One |
| D. | Zero |
| Answer» E. | |
| 2858. |
If \[HN{{O}_{3}}\] changes into \[{{N}_{2}}O\], the oxidation number is changed by [BHU 1997; AFMC 2001] |
| A. | + 2 |
| B. | -1 |
| C. | 0 |
| D. | 4 |
| Answer» E. | |
| 2859. |
In which one of the following changes there are transfer of five electrons [NCERT 1982] |
| A. | \[MnO_{4}^{-}\to \,M{{n}^{2+}}\] |
| B. | \[CrO_{4}^{2}\to \,C{{r}^{3+}}\] |
| C. | \[MnO_{4}^{2-}\to \,Mn{{O}_{2}}\] |
| D. | \[C{{r}_{2}}O_{7}^{2-}\,\to \,2C{{r}^{3+}}\] |
| Answer» B. \[CrO_{4}^{2}\to \,C{{r}^{3+}}\] | |
| 2860. |
In an oxidation process, oxidation number [CPMT 1976] |
| A. | Decreases |
| B. | Increases |
| C. | Does not change |
| D. | First increases then decreases |
| Answer» C. Does not change | |
| 2861. |
An element which never has a positive oxidation number in any of its compounds [AIIMS 1981] |
| A. | Boron |
| B. | Oxygen |
| C. | Chlorine |
| D. | Fluorine |
| Answer» E. | |
| 2862. |
The oxidation state of \[I\] in \[{{H}_{4}}IO_{6}^{-}\] is [CBSE PMT 1994] |
| A. | + 7 |
| B. | 5 |
| C. | + 1 |
| D. | -1 |
| Answer» B. 5 | |
| 2863. |
The oxidation state of chlorine in \[KCl{{O}_{4}}\] is [CPMT 1985] |
| A. | - 1 |
| B. | 1 |
| C. | + 7 |
| D. | -7 |
| Answer» D. -7 | |
| 2864. |
In which of the following compounds the oxidation number of carbon is maximum |
| A. | \[HCHO\] |
| B. | \[CHC{{l}_{3}}\] |
| C. | \[C{{H}_{3}}OH\] |
| D. | \[{{C}_{12}}{{H}_{22}}{{O}_{11}}\] |
| Answer» C. \[C{{H}_{3}}OH\] | |
| 2865. |
The oxidation number of N in \[{{N}_{2}}H_{5}^{+}\] [Pb. PMT 2001] |
| A. | - 3 |
| B. | (- 2) |
| C. | - 1 |
| D. | 2 |
| Answer» C. - 1 | |
| 2866. |
\[HN{{O}_{2}}\] acts both as reductant and oxidant, while \[HN{{O}_{3}}\] acts only as oxidant. It is due to their [AIIMS 2000] |
| A. | Solubility ability |
| B. | Maximum oxidation number |
| C. | Minimum oxidation number |
| D. | Minimum number of valence electrons |
| Answer» C. Minimum oxidation number | |
| 2867. |
The sum of the oxidation numbers of all the carbons in \[{{C}_{6}}{{H}_{5}}CHO\] is [EAMCET 1986] |
| A. | + 2 |
| B. | 0 |
| C. | + 4 |
| D. | -4 |
| Answer» E. | |
| 2868. |
Oxidation state of elemental carbon is [MNR 1983] |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» B. 1 | |
| 2869. |
The oxidation number of \[Fe\] and \[S\] in iron pyrites are [RPMT 1997] |
| A. | 4, - 2 |
| B. | 2, - 1 |
| C. | 3, - 1.5 |
| D. | 3, - 1 |
| Answer» B. 2, - 1 | |
| 2870. |
Sulphur has highest oxidation state in [EAMCET 1991] |
| A. | \[S{{O}_{2}}\] |
| B. | \[{{H}_{2}}S{{O}_{4}}\] |
| C. | \[N{{a}_{2}}{{S}_{2}}{{O}_{3}}\] |
| D. | \[N{{a}_{2}}{{S}_{4}}{{O}_{6}}\] |
| Answer» C. \[N{{a}_{2}}{{S}_{2}}{{O}_{3}}\] | |
| 2871. |
Which of the following statements is correct [AFMC 1997] |
| A. | Hydrogen has oxidation number \[-1\] and \[+\,1\] |
| B. | Hydrogen has same electronegativity as halogens |
| C. | Hydrogen will not be liberated at anode |
| D. | Hydrogen has same ionization potential as alkali metals |
| Answer» B. Hydrogen has same electronegativity as halogens | |
| 2872. |
The oxidation state of \[Cr\] in \[{{[Cr{{(N{{H}_{3}})}_{4}}C{{l}_{2}}]}^{+}}\] is [AIEEE 2005] |
| A. | +3 |
| B. | +2 |
| C. | +1 |
| D. | 0 |
| Answer» B. +2 | |
| 2873. |
The oxidation number of S in \[{{H}_{2}}{{S}_{2}}{{O}_{8}}\]is [MP PET 2002] |
| A. | + 2 |
| B. | + 4 |
| C. | + 6 |
| D. | + 7 |
| Answer» D. + 7 | |
| 2874. |
The process in which oxidation number increases is known as [CPMT 1976] |
| A. | Oxidation |
| B. | Reduction |
| C. | Auto-oxidation |
| D. | None of the above |
| Answer» B. Reduction | |
| 2875. |
The oxidation number of carbon in \[C{{H}_{2}}C{{l}_{2}}\] is [CPMT 1976; Pb. PET 1999; AFMC 2004] |
| A. | 0 |
| B. | + 2 |
| C. | \[-2\] |
| D. | + 4 |
| Answer» B. + 2 | |
| 2876. |
The oxidation number of \[Pt\]in \[{{[Pt({{C}_{2}}{{H}_{4}})\,C{{l}_{3}}]}^{-}}\] is [MNR 1993] |
| A. | + 1 |
| B. | + 2 |
| C. | + 3 |
| D. | + 4 |
| Answer» C. + 3 | |
| 2877. |
Oxidation number of carbon in \[{{H}_{2}}{{C}_{2}}{{O}_{4}}\] is [CPMT 1982] |
| A. | + 4 |
| B. | 3 |
| C. | + 2 |
| D. | -2 |
| Answer» C. + 2 | |
| 2878. |
Carbon is in the lowest oxidation state in [NCERT 1979; MH CET 1999] |
| A. | \[C{{H}_{4}}\] |
| B. | \[CC{{l}_{4}}\] |
| C. | \[C{{F}_{4}}\] |
| D. | \[C{{O}_{2}}\] |
| Answer» B. \[CC{{l}_{4}}\] | |
| 2879. |
In which of the following compound transition metal has zero oxidation state [CBSE PMT 1999; BHU 2000] |
| A. | \[Cr{{O}_{5}}\] |
| B. | \[N{{H}_{2}}.N{{H}_{2}}\] |
| C. | \[NOCl{{O}_{4}}\] |
| D. | \[[Fe{{(CO)}_{5}}]\] |
| Answer» E. | |
| 2880. |
Maximum oxidation state of Cr is [RPMT 2002] |
| A. | 3 |
| B. | 4 |
| C. | 6 |
| D. | 7 |
| Answer» D. 7 | |
| 2881. |
Oxidation number of oxygen in \[{{O}_{2}}\] molecule is [CPMT 1984] |
| A. | + 1 |
| B. | 0 |
| C. | + 2 |
| D. | -2 |
| Answer» C. + 2 | |
| 2882. |
The oxidation state of \[Mn\] in \[{{K}_{2}}Mn{{O}_{4}}\] [CPMT 1982, 83, 84; DPMT 1982; NCERT 1973; AMU 2000] |
| A. | + 2 |
| B. | 7 |
| C. | - 2 |
| D. | 6 |
| Answer» E. | |
| 2883. |
The oxidation number of \[As\] is [RPMT 1997] |
| A. | + 2 and + 3 |
| B. | + 3 and + 5 |
| C. | + 3 and + 4 |
| D. | None of these |
| Answer» C. + 3 and + 4 | |
| 2884. |
\[S{{n}^{++}}\]loses two electrons in a reaction. What will be the oxidation number of tin after the reaction |
| A. | + 2 |
| B. | Zero |
| C. | + 4 |
| D. | -2 |
| Answer» D. -2 | |
| 2885. |
The oxidation number of \[Mn\] in \[MnO_{4}^{-1}\] is |
| A. | + 7 |
| B. | -5 |
| C. | + 6 |
| D. | 5 |
| Answer» B. -5 | |
| 2886. |
Oxidation number of \[N\] in \[HN{{O}_{3}}\] is [BHU 1997] |
| A. | - 3.5 |
| B. | 3.5 |
| C. | - 3, +5 |
| D. | 5 |
| Answer» E. | |
| 2887. |
Oxidation state of chlorine in perchloric acid is [EAMCET 1989] |
| A. | -1 |
| B. | 0 |
| C. | -7 |
| D. | 7 |
| Answer» E. | |
| 2888. |
Oxidation number of nickel in \[Ni{{(CO)}_{4}}\] [AIIMS 1984; MNR 1985; CPMT 1997; MP PET/PMT 1998; AMU 2000; 01] |
| A. | 0 |
| B. | 4 |
| C. | - 4 |
| D. | 2 |
| Answer» B. 4 | |
| 2889. |
In which compound, oxidation state of nitrogen is 1 [MP PMT 1989] |
| A. | \[NO\] |
| B. | \[{{N}_{2}}O\] |
| C. | \[N{{H}_{2}}OH\] |
| D. | \[{{N}_{2}}{{H}_{4}}\] |
| Answer» C. \[N{{H}_{2}}OH\] | |
| 2890. |
Oxidation number of \[N\] in \[{{(N{{H}_{4}})}_{2}}S{{O}_{4}}\] is [CPMT 1996] |
| A. | - 1 / 3 |
| B. | -1 |
| C. | + 1 |
| D. | - 3 |
| Answer» E. | |
| 2891. |
Oxidation number of \[S\]in \[{{S}^{2-}}\]is [CPMT 1979] |
| A. | - 2 |
| B. | 0 |
| C. | - 6 |
| D. | 2 |
| Answer» B. 0 | |
| 2892. |
The oxidation state of I in \[IP{{O}_{4}}\] is [Orissa JEE 2005] |
| A. | +1 |
| B. | +3 |
| C. | +5 |
| D. | +7 |
| Answer» C. +5 | |
| 2893. |
The oxidation state of chromium in the final product formed by the reaction between KI and acidified potassium dichromate solution is [AIEEE 2005] |
| A. | +4 |
| B. | +6 |
| C. | +2 |
| D. | +3 |
| Answer» E. | |
| 2894. |
Oxidation number of S in \[SO_{4}^{2-}\] [BCECE 2005] |
| A. | + 6 |
| B. | 3 |
| C. | + 2 |
| D. | -2 |
| Answer» B. 3 | |
| 2895. |
Oxidation number of nitrogen in \[NaN{{O}_{2}}\] is [Pb. CET 2000] |
| A. | + 2 |
| B. | 3 |
| C. | + 4 |
| D. | -3 |
| Answer» C. + 4 | |
| 2896. |
The oxidation number of sulphur in \[{{H}_{2}}S\] is [Pb. CET 2002] |
| A. | - 2 |
| B. | 3 |
| C. | + 2 |
| D. | -3 |
| Answer» B. 3 | |
| 2897. |
The oxidation state shown by silicon when it combines with strongly electropositive metals is [MH CET 2004] |
| A. | - 2 |
| B. | -4 |
| C. | + 4 |
| D. | -2 |
| Answer» C. + 4 | |
| 2898. |
Which of the following elements never show positive oxidation number [CPMT 2004] |
| A. | \[O\] |
| B. | \[Fe\] |
| C. | \[Ga\] |
| D. | \[F\] |
| Answer» E. | |
| 2899. |
What is the net charge on ferrous ion [AFMC 2004] |
| A. | + 2 |
| B. | + 3 |
| C. | + 4 |
| D. | + 5 |
| Answer» B. + 3 | |
| 2900. |
Oxidation number of \[N\]in \[N{{H}_{3}}\]is [CPMT 1979; Pb CET 2004] |
| A. | - 3 |
| B. | 3 |
| C. | 0 |
| D. | 5 |
| Answer» B. 3 | |