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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.
| 10551. |
Which one of the following is purely reducing agent? |
| A. | Hydrogen sulphide |
| B. | Hydrogen peroxide |
| C. | Sulphur dioxide |
| D. | Ozone |
| Answer» B. Hydrogen peroxide | |
| 10552. |
In which of the following compounds, the oxidation number of iodine is fractional: |
| A. | \[I{{F}_{7}}\] |
| B. | \[I_{3}^{-}\] |
| C. | \[I{{F}_{3}}\] |
| D. | \[I{{F}_{5}}\] |
| Answer» C. \[I{{F}_{3}}\] | |
| 10553. |
Tendency of \[{{l}^{-}},\text{ }B{{r}^{-}},\text{ }C{{l}^{-}}\] and \[{{F}^{-}}\] to be oxidized is in order: |
| A. | \[{{l}^{-}}>\text{ }B{{r}^{-}}>\text{ }C{{l}^{-}}>{{F}^{-}}\] |
| B. | \[{{l}^{-}}>\text{ }B{{r}^{-}}<\text{ }C{{l}^{-}}<{{F}^{-}}\] |
| C. | \[{{l}^{-}}<C{{l}^{-}}>\text{ }{{F}^{-}}>B{{r}^{-}}\] |
| D. | \[{{l}^{-}}=B{{r}^{-}}>\text{ }C{{l}^{-}}={{F}^{-}}\] |
| Answer» B. \[{{l}^{-}}>\text{ }B{{r}^{-}}<\text{ }C{{l}^{-}}<{{F}^{-}}\] | |
| 10554. |
Conversion of sugar into carbondioxide \[({{C}_{11}}{{H}_{22}}{{O}_{11}}\xrightarrow{{}}C{{O}_{2}})\] is: |
| A. | Oxidation |
| B. | Reduction |
| C. | Niether oxidation nor reduction |
| D. | Both oxidation and reduction. |
| Answer» B. Reduction | |
| 10555. |
The oxidation states of S-atoms in Marshell's and Caro's acid are |
| A. | +6, +7 |
| B. | +6, +6 |
| C. | +7, +7 |
| D. | +4, +4 |
| Answer» C. +7, +7 | |
| 10556. |
What is the possible oxidation state of chlorine present in bleaching powder? |
| A. | 1 |
| B. | -1 |
| C. | Both - 1 and +1 |
| D. | zero |
| Answer» D. zero | |
| 10557. |
What mass of \[{{H}_{2}}(g)\] is needed to reduce 192 gm. of \[Mo{{O}_{3}}\] to metal? [At. wt. of Mo = 96] |
| A. | 8 gm. |
| B. | 16 gm. |
| C. | 32 gm. |
| D. | None of these |
| Answer» B. 16 gm. | |
| 10558. |
Match List I with List II and select the correct answer using the code given below the lists:List IList IIOxidising agent(p) Disproportionation\[M{{n}_{3}}{{O}_{4}}\](q) Redox reaction\[{{C}_{6}}{{H}_{6}}\](r) Decreases oxidation number\[2C{{u}^{+}}\xrightarrow{{}}C{{u}^{2+}}\]\[+C{{u}^{0}}\](s) Fractional oxidation number(E) \[{{H}_{2}}{{O}_{2}}+{{O}_{3}}\xrightarrow{{}}\]\[{{H}_{2}}O+2{{O}_{2}}\](t) Oxidation number is -1Codes: |
| A. | A\[\to \]q, B\[\to \]p, C\[\to \]t, D\[\to \]s, E\[\to \]r |
| B. | A\[\to \]t, B\[\to \]s, C\[\to \]r, D\[\to \]q, E\[\to \]P |
| C. | A\[\to \]r, B\[\to \]t, C\[\to \]s, D\[\to \]p, E\[\to \]q |
| D. | A\[\to \]r, B\[\to \]s, C\[\to \]t, D\[\to \]p, E\[\to \]q |
| Answer» E. | |
| 10559. |
The pair of compounds in which both the metals are in the highest possible oxidation state is |
| A. | \[{{[Fe{{(CN)}_{6}}]}^{3-}},\,{{[Co{{(CN)}_{6}}]}^{3-}}\] |
| B. | \[Cr{{O}_{2}}C{{l}_{2}},\,MnO_{4}^{-}\] |
| C. | \[Ti{{O}_{3}},\,Mn{{O}_{2}}\] |
| D. | \[{{[Co{{(CN)}_{6}}]}^{3-}},\,Mn{{O}_{3}}\] |
| Answer» C. \[Ti{{O}_{3}},\,Mn{{O}_{2}}\] | |
| 10560. |
16 gm of metal carbonate converts into 18.8 gm of metal oxalate. The equivalent mass of metal chloride is |
| A. | 50 |
| B. | 85.5 |
| C. | 100 |
| D. | 135.5 |
| Answer» C. 100 | |
| 10561. |
How many moles of \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] can be reduced by 1 mole of \[S{{n}^{2+}}\] [MP PMT 2003] |
| A. | 1/3 |
| B. | 1/6 |
| C. | 2/3 |
| D. | 1 |
| Answer» B. 1/6 | |
| 10562. |
The value of \[x\] in the partial redox equation \[MnO_{4}^{-}+8{{H}^{+}}+xe\] ⇌\[M{{n}^{2+}}+4{{H}_{2}}O\] is |
| A. | 5 |
| B. | 3 |
| C. | 1 |
| D. | 0 |
| Answer» B. 3 | |
| 10563. |
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 | |
| 10564. |
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. | |
| 10565. |
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 | |
| 10566. |
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 | |
| 10567. |
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. | |
| 10568. |
Which of these substances is a good reducing agent [NCERT 1979; CPMT 1988] |
| A. | \[NaOCl\] |
| B. | \[HI\] |
| C. | \[FeC{{l}_{3}}\] |
| D. | \[KBr\] |
| Answer» C. \[FeC{{l}_{3}}\] | |
| 10569. |
Which of the following cannot work as oxidising agent [CPMT 1996] |
| A. | \[{{O}_{2}}\] |
| B. | \[KMn{{O}_{4}}\] |
| C. | \[{{I}_{2}}\] |
| D. | None of these |
| Answer» D. None of these | |
| 10570. |
The conversion of \[Pb{{O}_{2}}\] to \[Pb{{(N{{O}_{3}})}_{2}}\]is |
| A. | Oxidation |
| B. | Reduction |
| C. | Neither oxidation nor reduction |
| D. | Both oxidation and reduction |
| Answer» C. Neither oxidation nor reduction | |
| 10571. |
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. | |
| 10572. |
The conversion of sugar \[{{C}_{12}}{{H}_{22}}{{O}_{11}}\,\to \,\,C{{O}_{2}}\]is |
| A. | Oxidation |
| B. | Reduction |
| C. | Neither oxidation nor reduction |
| D. | Both oxidation and reduction |
| Answer» B. Reduction | |
| 10573. |
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. | |
| 10574. |
\[Z{{n}^{2+}}(aq)+2e\,\to \,Zn(s).\] This is [CPMT 1985] |
| A. | Oxidation |
| B. | Reduction |
| C. | Redox reaction |
| D. | None of these |
| Answer» C. Redox reaction | |
| 10575. |
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 | |
| 10576. |
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 | |
| 10577. |
\[{{H}_{2}}S\] 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 | |
| 10578. |
In which reaction there is a change in valency [NCERT 1971; CPMT 1971] |
| A. | \[2N{{O}_{2}}\,\to \,\,{{N}_{2}}{{O}_{4}}\] |
| B. | \[2N{{O}_{2}}+{{H}_{2}}O\,\to \,HN{{O}_{2}}+HN{{O}_{3}}\] |
| C. | \[N{{H}_{4}}OH\,\to \,NH_{4}^{+}+O{{H}^{-}}\] |
| D. | \[CaC{{O}_{3}}\,\to \,CaO+C{{O}_{2}}\] |
| Answer» C. \[N{{H}_{4}}OH\,\to \,NH_{4}^{+}+O{{H}^{-}}\] | |
| 10579. |
Oxidation state of oxygen atom in potassium superoxide is [MNR 1988; NCERT 1980] |
| A. | 0 |
| B. | -1 |
| C. | \[-\tfrac{1}{2}\] |
| D. | -2 |
| Answer» D. -2 | |
| 10580. |
Oxidation state of ?S? in \[{{H}_{2}}S{{O}_{3}}\] [RPET 2003] |
| A. | 3 |
| B. | 6 |
| C. | 4 |
| D. | 2 |
| Answer» D. 2 | |
| 10581. |
The most common oxidation state of an element is ?2. The number of electrons present in its outermost shell is [BHU 1983; NCERT 1974; CPMT 1977] |
| A. | 4 |
| B. | 2 |
| C. | 6 |
| D. | 8 |
| Answer» D. 8 | |
| 10582. |
The oxidation number of \[Cr\] in \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\]is [CPMT 1981, 85, 90, 93, 99; KCET 1992; BHU 1988, 98; AFMC 1991, 99; EAMCET 1986; MP PMT 1996, 99, 2002; MP PET/PMT 1998; Bihar CEE 1995; RPET 2000] |
| A. | 6 |
| B. | -7 |
| C. | 2 |
| D. | -2 |
| Answer» B. -7 | |
| 10583. |
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 | |
| 10584. |
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. | |
| 10585. |
The oxidation number of N in \[{{N}_{2}}H_{5}^{+}\] [Pb. PMT 2001] |
| A. | -3 |
| B. | (- 2) |
| C. | -1 |
| D. | 2 |
| Answer» C. -1 | |
| 10586. |
The oxidation number of nitrogen in \[NO_{3}^{-}\] is [CPMT 1982] |
| A. | -1 |
| B. | 2 |
| C. | 3 |
| D. | 5 |
| Answer» E. | |
| 10587. |
The oxidation state of nitrogen in \[{{N}_{3}}H\]is [NCERT 1977, 81] |
| A. | \[+\frac{1}{3}\] |
| B. | 3 |
| C. | \[-1\] |
| D. | \[-\frac{1}{3}\] |
| Answer» E. | |
| 10588. |
The oxidation number of Ba in barium peroxide is [Pb. PMT 2002] |
| A. | 6 |
| B. | 2 |
| C. | 1 |
| D. | 4 |
| Answer» C. 1 | |
| 10589. |
The oxidation states of phosphorus vary from [CPMT 1976] |
| A. | - 3 to +5 |
| B. | - 1 to +1 |
| C. | - 3 to +3 |
| D. | - 5 to +1 |
| Answer» B. - 1 to +1 | |
| 10590. |
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. | |
| 10591. |
The oxidation number of sulphur in \[{{H}_{2}}S{{O}_{4}}\]is [CPMT 1979Pb. CET 2002] |
| A. | -2 |
| B. | 2 |
| C. | 4 |
| D. | 6 |
| Answer» E. | |
| 10592. |
The oxidation number of chlorine in \[HOCl\] |
| A. | -1 |
| B. | 0 |
| C. | 1 |
| D. | 2 |
| Answer» D. 2 | |
| 10593. |
What is the net charge on ferrous ion [AFMC 2004] |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» B. 3 | |
| 10594. |
What is the oxidation number of Co in \[[Co{{(N{{H}_{3}})}_{4}}ClN{{O}_{2}}]\] [BHU 1999] |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» B. 3 | |
| 10595. |
In the following reaction, \[3B{{r}_{2}}+6C{{O}^{2-}}_{3}+3{{H}_{2}}O=5B{{r}^{-}}+Br{{O}_{3}}^{-}+6HC{{O}_{3}}\] |
| A. | Bromine is oxidised and carbonate is reduced |
| B. | Bromine is reduced and water is oxidized |
| C. | Bromine is neither reduced nor oxidized |
| D. | Bromine is both reduced and oxidised |
| Answer» E. | |
| 10596. |
In the compound \[YB{{a}_{2}}C{{u}_{3}}{{O}_{7}}\] which shows superconductivity, what is the oxidation state of cu? Assume the rare earth element yttrium is in its usual +3 oxidation state. |
| A. | \[+\frac{7}{3}\] |
| B. | \[-\frac{7}{3}\] |
| C. | \[+\frac{5}{3}\] |
| D. | \[-\frac{5}{3}\] |
| Answer» B. \[-\frac{7}{3}\] | |
| 10597. |
Which of the following has been arranged in order of increasing oxidation number of nitrogen? |
| A. | \[N{{H}_{3}}<{{N}_{2}}{{O}_{5}}<NO<{{N}_{2}}\] |
| B. | \[N{{O}^{+}}_{2}<N{{O}^{-}}_{3}<N{{O}^{-}}_{2}<{{N}^{-}}_{3}\] |
| C. | \[N{{H}^{+}}_{4}<{{N}_{2}}{{H}_{4}}<N{{H}_{2}}OH<{{N}_{2}}O\] |
| D. | \[N{{O}_{3}}<Na{{N}_{3}}<N{{H}^{+}}_{4}<{{N}_{2}}O\] |
| Answer» D. \[N{{O}_{3}}<Na{{N}_{3}}<N{{H}^{+}}_{4}<{{N}_{2}}O\] | |
| 10598. |
The polymerisation reaction shown below would produce |
| A. | PVC |
| B. | neoprene |
| C. | chloroprene |
| D. | Rubber |
| Answer» E. | |
| 10599. |
Formation of polyethylene from calcium carbide takes place as follows: \[Ca{{C}_{2}}+2{{H}_{2}}O\to Ca{{(OH)}_{2}}+{{C}_{2}}{{H}_{2}}\]\[{{C}_{2}}{{H}_{2}}+{{H}_{2}}\to {{C}_{2}}{{H}_{2}}\] \[n{{C}_{2}}{{H}_{2}}\to {{(-C{{H}_{2}}-C{{H}_{2}}-)}_{n}}\] The amount of polyethylene obtained from 64.1 kg of\[Ca{{C}_{2}}\] is |
| A. | 7 kg |
| B. | 4 kg |
| C. | 21 kg |
| D. | 28 kg |
| Answer» C. 21 kg | |
| 10600. |
Nylon-6, 10 is prepared by the condensation polymerisation of |
| A. | adipic acid and hexamethylenediamine |
| B. | sebacic acid and hexamethylene-diamine |
| C. | sebacic acid and hexamethylene-amine |
| D. | none of the above |
| Answer» C. sebacic acid and hexamethylene-amine | |