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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.
| 3601. |
The molality of a urea solution in which 0.0200 g of urea (\[N{{H}_{2}}CON{{H}_{2}}\]) is added to 0.400 \[d{{m}^{3}}\] of water at STP is |
| A. | \[0.555\,mol\,k{{g}^{-1}}\] |
| B. | \[5.55\times {{10}^{-4}}\,mol\,k{{g}^{-1}}\] |
| C. | \[8.33\times {{10}^{-4}}\,mol\,k{{g}^{-1}}\] |
| D. | \[33.3\,mol\,k{{g}^{-1}}\] |
| Answer» D. \[33.3\,mol\,k{{g}^{-1}}\] | |
| 3602. |
PbS has NaCl type structure. The distance between \[P{{b}^{2+}}\] and \[{{S}^{2-}}\] ions is 297 pm. What is the volume of unit cell of PbS? |
| A. | \[209.6\times {{10}^{-24}}c{{m}^{3}}\] |
| B. | \[207.8\times {{10}^{-23}}c{{m}^{3}}\] |
| C. | \[22.3\times {{10}^{-23}}c{{m}^{3}}\] |
| D. | \[209.8\times {{10}^{-23}}c{{m}^{3}}\] |
| Answer» B. \[207.8\times {{10}^{-23}}c{{m}^{3}}\] | |
| 3603. |
Which of the following statement is not true about the hexagonal close packing? |
| A. | The coordination number is 12 |
| B. | It has 74% packing efficiency |
| C. | Tetrahedral voids of the second layer are covered by the spheres of the third layer |
| D. | In this arrangement, spheres of the fourth layer are exactly aligned with those of the first layer |
| Answer» E. | |
| 3604. |
A mineral has molecular formula \[X{{Y}_{2}}{{O}_{4}}\cdot {{O}^{2-}}\] ions are arranged in ccp and cations of X are present in octahedral voids. Cations of Y are equally distributed among octahedral and tetrahedral voids. The fraction of the octahedral voids occupied will be |
| A. | \[\frac{1}{6}\] |
| B. | \[\frac{1}{8}\] |
| C. | \[\frac{1}{4}\] |
| D. | \[\frac{1}{2}\] |
| Answer» E. | |
| 3605. |
How many tetrahedral holes are occupied in a diamond? |
| A. | 25% |
| B. | 0.5 |
| C. | 75% |
| D. | 1 |
| Answer» C. 75% | |
| 3606. |
Consider a cube 1 of body centered cubic unit cell of edge length a. Now atom at the body centre can be viewed to be lying on the comer of another cube 2. Find the volume common to cube 1 and cube 2. |
| A. | \[\frac{{{a}^{3}}}{27}\] |
| B. | \[\frac{{{a}^{3}}}{64}\] |
| C. | \[\frac{{{a}^{3}}}{2\sqrt{2}}\] |
| D. | \[\frac{{{a}^{3}}}{8}\] |
| Answer» E. | |
| 3607. |
In a face centered lattice of X and Y, X atoms are present at the comers while Y atoms are at face centers. Then the formula of the compound would be if two atoms of X are missing from the comers: |
| A. | \[{{X}_{4}}\]Y |
| B. | \[{{X}_{3}}\]\[{{Y}_{4}}\] |
| C. | X\[{{Y}_{4}}\] |
| D. | \[{{X}_{2}}\]\[{{Y}_{4}}\] |
| Answer» D. \[{{X}_{2}}\]\[{{Y}_{4}}\] | |
| 3608. |
In Bragg's X-ray diffraction studies. 100 pm X-ray second order diffraction at glancing angle of\[30{}^\circ \]. Its interplanar spacing will be |
| A. | 200 pm |
| B. | 150 pm. |
| C. | 100 pm |
| D. | 144 pm |
| Answer» B. 150 pm. | |
| 3609. |
Which of the following pairs contain ferromagnetic and ferrimagnetic solids respectively? |
| A. | \[F{{e}_{2}}{{O}_{3}},F{{e}_{3}}{{O}_{4}}\] |
| B. | \[F{{e}_{3}}{{O}_{4}},C{{r}_{2}}{{O}_{3}}\] |
| C. | \[Cr{{O}_{2}},F{{e}_{3}}{{O}_{4}}\] |
| D. | \[C{{r}_{2}}{{O}_{3}},Cr{{O}_{2}}\] |
| Answer» D. \[C{{r}_{2}}{{O}_{3}},Cr{{O}_{2}}\] | |
| 3610. |
If NaCl is doped with \[{{10}^{-3}}\] mole% of \[SrC{{l}_{2}}\], the number of cationic vacancies is |
| A. | \[6.02\times {{10}^{-18}}mo{{l}^{-1}}\] |
| B. | \[{{10}^{-5}}mo{{l}^{-1}}\] |
| C. | \[6.02\times {{10}^{20}}mo{{l}^{-1}}\] |
| D. | \[6.02\times {{10}^{18}}mo{{l}^{-1}}\] |
| Answer» E. | |
| 3611. |
The spinel structure (\[A{{B}_{2}}{{O}_{4}}\]) consists of an fee array of \[{{O}^{2-}}\] ions in which the: |
| A. | A cation occupies one-eighth of the tetrahedral holes and B cation occupies half of octahedral holes |
| B. | A cation occupies one-fourth of the tetrahedral holes and the B cations the octahedral holes |
| C. | A cation occupies one-eighth of the octahedral hole and the B cation the tetrahedral holes |
| D. | A cation occupies one-fourth of the octahedral holes and the B cations the tetrahedral holes |
| Answer» B. A cation occupies one-fourth of the tetrahedral holes and the B cations the octahedral holes | |
| 3612. |
The number of unit cells in 58.5 g of NaCl is nearly |
| A. | \[6\times {{10}^{20}}\] |
| B. | \[1.5\times {{10}^{23}}\] |
| C. | \[3\times {{10}^{22}}\] |
| D. | \[0.5\times {{10}^{24}}\] |
| Answer» C. \[3\times {{10}^{22}}\] | |
| 3613. |
The density of solid argon (Ar = 40 g/mol) is 1.68 g/mL at 40 K. If the argon atom is assumed to be a sphere of radius \[1.50\times {{10}^{-8}}\] cm, what % of solid Ar is apparently empty space? (use \[{{N}_{A}}\] = \[6\times {{10}^{23}}\]) |
| A. | 35.64 |
| B. | 64.36 |
| C. | 74 |
| D. | none of these |
| Answer» C. 74 | |
| 3614. |
A mineral of iron contains an oxide containing 72.36% iron by mass and has a density of 5.2 g/cc. Its unit cell is cubic with edge length of 839 pm. What is the total number of atoms (ions) present in each unit cell? (Fe-56, O-16) |
| A. | 58 |
| B. | 57 |
| C. | 56 |
| D. | 55 |
| Answer» D. 55 | |
| 3615. |
\[MgA{{l}_{2}}{{O}_{4}}\], is found in the spinel structure in which \[{{O}^{2-}}\] ions constitute CCP lattice, \[M{{g}^{2+}}\] ions occupy l/8th of the tetrahedral voids and \[A{{l}^{3+}}\] ions occupy 1/2 of the octahedral voids. Find the total +ve charge contained in one unit cell. |
| A. | +7/4 electronic charge |
| B. | +6 electronic charge |
| C. | +2 electronic charge |
| D. | +8 electronic charge |
| Answer» E. | |
| 3616. |
Which of the following solids are not correctly matched with the bonds found between the constituent particles? |
| A. | Solid \[C{{O}_{2}}\]: van der Waals |
| B. | Graphite: Covalent and van der Waals |
| C. | Grey Cast Iron: Ionic |
| D. | Metal alloys: lons-delocalised electrons |
| Answer» D. Metal alloys: lons-delocalised electrons | |
| 3617. |
25 mL of 0.50 M \[{{H}_{2}}{{O}_{2}}\], solution is added to 50 mL of 0.20 M \[KMn{{O}_{4}}\] in acid solution. Which of the following statements is true? |
| A. | 0.010 mole of oxygen is liberated |
| B. | 0.005 mole of \[KMn{{O}_{4}}\]are left |
| C. | 0.030 g atom of oxygen is evolved. |
| D. | 0.0025 mole \[{{H}_{2}}{{O}_{2}}\]does not react with \[KMn{{O}_{4}}\] |
| Answer» C. 0.030 g atom of oxygen is evolved. | |
| 3618. |
CuS is dissolved in dil. \[HN{{O}_{3}}\]. Balanced equation with correct products is |
| A. | \[CuS=2{{H}^{+}}=3N{{O}^{-}}_{3}\to Cu(N{{O}_{3}}+{{H}_{2}}S)\]\[+{{H}_{2}}O+N{{O}_{2}}\] |
| B. | \[3CuS=8{{H}^{+}}=8N{{O}^{-}}_{3}\to 3Cu{{(N{{O}_{3}})}_{2}}+3S\]\[+4{{H}_{2}}O+2N{{O}_{}}\] |
| C. | \[CuS+4N{{O}^{-}}_{3}\to Cu{{(N{{O}_{3}})}_{2}}+{{H}_{2}}S+{{H}_{2}}O\] |
| D. | None of the above incorrect |
| Answer» C. \[CuS+4N{{O}^{-}}_{3}\to Cu{{(N{{O}_{3}})}_{2}}+{{H}_{2}}S+{{H}_{2}}O\] | |
| 3619. |
For the redox reaction \[Mn{{O}^{-}}_{4}\]\[+\]\[{{C}_{2}}{{O}_{4}}^{2-}\]\[+\]\[{{H}^{+}}\]\[\to M{{N}^{2+}}\]\[+C{{O}_{2}}\]\[+{{H}_{2}}O\]the correct coefficients of the reactants for the balanced reaction are |
| A. | \[MnO_{4}^{-}\]\[{{C}_{2}}O_{4}^{2-}\]\[{{H}^{+}}\]2516 |
| B. | \[MnO_{4}^{-}\]\[{{C}_{2}}O_{4}^{2-}\]\[{{H}^{+}}\]1652 |
| C. | \[MnO_{4}^{-}\]\[{{C}_{2}}O_{4}^{2-}\]\[{{H}^{+}}\]5162 |
| D. | \[MnO_{4}^{-}\]\[{{C}_{2}}O_{4}^{2-}\]\[{{H}^{+}}\]2165 |
| Answer» B. \[MnO_{4}^{-}\]\[{{C}_{2}}O_{4}^{2-}\]\[{{H}^{+}}\]1652 | |
| 3620. |
In the redox reaction \[xMnO+yPb{{O}_{2}}+\]\[zHN{{O}_{3}}\to HMn{{O}_{4}}+Pb{{(N{{O}_{3}})}_{2}}+{{H}_{2}}O\] |
| A. | \[x=2,\text{ }y=5,\text{ }z=10\] |
| B. | \[x=2,\text{ }y=7,\text{ }z=8\]b |
| C. | \[x=2,\text{ }y=5,\text{ }z=8\] |
| D. | \[x=2,\text{ }y=5,\text{ }z=5\] |
| Answer» B. \[x=2,\text{ }y=7,\text{ }z=8\]b | |
| 3621. |
When \[KMn{{O}_{4}}\] acts as an oxidising agent and ultimately forms \[{{[Mn{{O}_{4}}]}^{-2}},Mn{{O}_{2}},M{{n}_{2}}{{O}_{3}},M{{n}^{+2}}\], then the number of electrons transferred in each case respectively is |
| A. | 4, 3, 1, 5 |
| B. | 1, 5, 3, 7 |
| C. | 1, 3, 4, 5 |
| D. | 3, 5, 7, 1 |
| Answer» D. 3, 5, 7, 1 | |
| 3622. |
In which of the following reactions \[{{H}_{2}}{{O}_{2}}\] is a reducing agent? |
| 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. \[2HI+{{H}_{2}}{{O}_{2}}\to 2{{H}_{2}}O+{{I}_{2}}\] | |
| 3623. |
Oxida n states of the metal in the minerals Haematite and magnetite, respectively, are |
| A. | II, III, in heamatite and III in magnetite |
| B. | II, III in haematite and II in magnetite |
| C. | II in haematite and II, III in magnetite |
| D. | III is haematite and II, III in magnetite |
| Answer» E. | |
| 3624. |
Amount of oxalic acid present in a solution can be determined by its titration with \[KMn{{O}_{4}}\]solution in the presence of\[{{H}_{2}}S{{O}_{4}}\]. The titration gives unsatisfactory result when carried out in the presence of HCI. Because HCI: |
| A. | gets oxidized by oxalic acid to chlorine |
| B. | Furnishes \[{{H}^{+}}\] ions in addition to those from oxalic acid |
| C. | Reduces permanganate to \[M{{n}^{2+}}\] |
| D. | oxidizes oxalic acid to carbon dioxide and water |
| Answer» D. oxidizes oxalic acid to carbon dioxide and water | |
| 3625. |
The oxidation number of \[Cl\]in\[CaOC{{l}_{2}}\], (bleaching powder) is |
| A. | Zero, since it contains \[C{{l}_{2}}\] |
| B. | -1, since it contains \[C{{l}^{-}}\] |
| C. | +1, since it contains \[Cl{{O}^{-}}\] |
| D. | +1 and -1, since it contains \[Cl{{O}^{-}}\] and \[C{{l}^{-}}\] |
| Answer» B. -1, since it contains \[C{{l}^{-}}\] | |
| 3626. |
5 liters of \[KMn{{O}_{4}}\] solution contains 0.01 equiv of\[KMn{{O}_{4}}\]. 50 ml of the given solution contains how many moles of\[KMn{{O}_{4}}\]?\[KMn{{O}_{4}}\to Mn{{O}_{2}}\] |
| A. | \[\frac{{{10}^{-6}}}{4}\] |
| B. | \[\frac{{{10}^{-4}}}{3}\] |
| C. | \[3\times {{10}^{-5}}\] |
| D. | \[{{10}^{-5}}\] |
| Answer» C. \[3\times {{10}^{-5}}\] | |
| 3627. |
In the following unbalanced redox reaction, \[C{{u}_{3}}P+C{{r}_{2}}{{O}_{7}}^{2-}\to C{{u}^{2+}}+{{H}_{3}}P{{O}_{4}}+C{{r}^{3+}}\] Equivalent weight of \[{{H}_{3}}P{{O}_{4}}\] is |
| A. | \[\frac{M}{3}\] |
| B. | \[\frac{M}{6}\] |
| C. | \[\frac{M}{7}\] |
| D. | \[\frac{M}{8}\] |
| Answer» E. | |
| 3628. |
If 10 g of \[{{V}_{2}}{{O}_{5}}\], is dissolved in acid and is reduced to \[{{V}^{2+}}\] by zinc metal, how many mole of I, could be reduced by the resulting solution if it is further oxidised to \[V{{O}^{2+}}\]ions? [Assume no change in state of \[Z{{n}^{2+}}\]ions] (V=51,O=16, I=127): |
| A. | 0.11 mole of \[{{I}_{2}}\] |
| B. | 0.22 mole of \[{{I}_{2}}\] |
| C. | 0.055 mole of \[{{I}_{2}}\] |
| D. | 0.44 mole of \[{{I}_{2}}\] |
| Answer» B. 0.22 mole of \[{{I}_{2}}\] | |
| 3629. |
n the following equation : \[Cl{{O}^{-}}_{3}+6{{H}^{+}}+X\to C{{I}^{-}}+3{{H}_{2}}O,\] |
| A. | \[O\] |
| B. | \[6{{e}^{-}}\] |
| C. | \[{{O}_{2}}\] |
| D. | \[5{{e}^{-}}\] |
| Answer» C. \[{{O}_{2}}\] | |
| 3630. |
In the following conversion of chromite into soluble chromium salt \[4Fe(Cr{{O}_{2}})2+8N{{a}_{2}}C{{O}_{3}}+7{{O}_{2}}\to 2F{{e}_{2}}{{O}_{3}}+8NaCr{{O}_{4}}+8C{{O}_{2}}\]There is |
| A. | Oxidation of Fc and Cr both and reduction of \[{{O}_{2}}\] |
| B. | oxidation of Fe and reduction of Cr |
| C. | oxidation of Fe and Cr both reduction of barbon |
| D. | No redox reaction |
| Answer» B. oxidation of Fe and reduction of Cr | |
| 3631. |
An element A in a compound ABD has oxidation number \[{{A}^{{{n}^{-}}}}\]. It is oxidised by \[C{{r}_{2}}O_{7}^{2-}\] in acid medium. In the experiment \[1.68\times {{10}^{-3}}\]moles of \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\]was used for \[3.26\times {{10}^{-3}}\]moles of ABD. The new oxidation number of A after oxidation is: |
| A. | 3 |
| B. | 3-n |
| C. | n-3 |
| D. | |
| Answer» C. n-3 | |
| 3632. |
Which one of the following reactions does not involve either oxidation or reduction? |
| A. | \[V{{O}^{+}}_{2}\to {{V}_{2}}{{O}_{3}}\] |
| B. | \[Na\to N{{a}^{+}}\] |
| C. | \[Cr{{O}^{2-}}_{4}\]\[\to C{{r}_{2}}{{O}_{7}}^{2-}\] |
| D. | \[Z{{n}^{2+}}\to Zn\] |
| Answer» D. \[Z{{n}^{2+}}\to Zn\] | |
| 3633. |
Which radicals interfere in the test of basic radicals after group II qualitative analysis? |
| A. | \[P{{O}_{4}}^{3-}\] |
| B. | \[{{C}_{2}}{{O}_{4}}^{2-}\] |
| C. | \[{{F}^{-}}\] |
| D. | All of these |
| Answer» E. | |
| 3634. |
A dark green bead in the borax bead test (in oxidizing flame) indicates the presence of |
| A. | \[C{{r}^{3+}}\] |
| B. | \[M{{n}^{2+}}\] |
| C. | \[C{{o}^{2+}}\] |
| D. | \[N{{i}^{2+}}\] |
| Answer» B. \[M{{n}^{2+}}\] | |
| 3635. |
An inorganic salt solution gives a yellow precipitate with silver nitrate. The precipitate dissolves in dilute nitric acid as well as in ammonium hydroxide. The solution contains |
| A. | Bromide |
| B. | Iodide |
| C. | Phosphate |
| D. | Chromate |
| Answer» D. Chromate | |
| 3636. |
Which one of the following metal salts produces a blue coloured bead in cobalt nitrate charcoal cavity test? |
| A. | \[Z{{n}^{2+}}\] |
| B. | \[M{{g}^{2+}}\] |
| C. | \[S{{n}^{2+}}\] |
| D. | \[A{{l}^{3+}}\] |
| Answer» E. | |
| 3637. |
Which one of the following can be used in place of \[N{{H}_{4}}Cl\] for the identification of the third group radicals? |
| A. | \[N{{H}_{4}}N{{O}_{3}}\] |
| B. | \[{{(N{{H}_{4}})}_{2}}S{{O}_{4}}\] |
| C. | \[{{(N{{H}_{4}})}_{2}}C{{O}_{3}}\] |
| D. | \[NaCl\] |
| Answer» B. \[{{(N{{H}_{4}})}_{2}}S{{O}_{4}}\] | |
| 3638. |
A salt of \[NaX\xrightarrow{MgC{{l}_{2}}}\] White ppt. on boiling. Thus, anion X is |
| A. | \[HC{{O}^{-}}_{3}\] |
| B. | \[N{{O}_{3}}^{-}\] |
| C. | \[C{{O}_{3}}^{2-}\] |
| D. | \[S{{O}_{4}}^{2-}\] |
| Answer» B. \[N{{O}_{3}}^{-}\] | |
| 3639. |
In IV group analysis, \[N{{H}_{4}}OH\] is added before passing \[{{H}_{2}}S\] gas because |
| A. | The sulphides of IV group are insoluble in \[N{{H}_{4}}OH\] |
| B. | The sulphides of other metals are soluble in is\[N{{H}_{4}}OH\] |
| C. | The concentration of \[{{S}^{2-}}\] ions is increased |
| D. | The sulphides of second group are soluble in \[N{{H}_{4}}Cl\] |
| Answer» D. The sulphides of second group are soluble in \[N{{H}_{4}}Cl\] | |
| 3640. |
A red solid is insoluble in water. However, it becomes soluble if some KI is added to water, heating the red solid in a test tube results in liberation of some violet colored fumes and droplets of a metal appear on the cooler parts of the test tube. The red solid is |
| A. | \[HgO\] |
| B. | \[P{{b}_{3}}{{O}_{4}}\] |
| C. | \[{{(N{{H}_{4}})}_{2}}C{{r}_{2}}{{O}_{7}}\] |
| D. | \[Hg{{I}_{2}}\] |
| Answer» E. | |
| 3641. |
An aqueous solution of a substance gives a white precipitate on treatment with dilute hydrochloric acid, which dissolves on heating. When hydrogen sulfide is passed through the hot acidic solution, black precipitate is obtained. The substance is a |
| A. | \[Hg_{2}^{2+}\]salt |
| B. | \[C{{u}^{2+}}\]salt |
| C. | \[A{{g}^{2+}}\]salt |
| D. | \[P{{b}^{2+}}\]salt |
| Answer» E. | |
| 3642. |
Concentrated aqueous sodium hydroxide can separate a mixture of |
| A. | \[A{{l}^{3+}}\]and \[S{{n}^{2+}}\] |
| B. | \[A{{l}^{3+}}\] and \[F{{e}^{2+}}\] |
| C. | \[A{{l}^{3+}}\] and \[Z{{n}^{2+}}\] |
| D. | \[Z{{n}^{2+}}\] and \[P{{b}^{2+}}\] |
| Answer» C. \[A{{l}^{3+}}\] and \[Z{{n}^{2+}}\] | |
| 3643. |
A solution of metal ion when treated with KI, gives a red precipitate that dissolves in excess of KI to give a colorless solution. Moreover, the solution of metal ion on treatment with a solution of cobalt (II) thiocyanate gives rise to a deep blue crystalline precipitate. The metal ion is |
| A. | \[P{{b}^{2+}}\] |
| B. | \[H{{g}^{2+}}\] |
| C. | \[C{{u}^{2+}}\] |
| D. | \[C{{o}^{2+}}\] |
| Answer» C. \[C{{u}^{2+}}\] | |
| 3644. |
The reagents \[N{{H}_{4}}Cl\] and aqueous \[N{{H}_{3}}\] will precipitate |
| A. | \[C{{a}^{2+}}\] |
| B. | \[A{{l}^{3+}}\] |
| C. | \[M{{g}^{2+}}\] |
| D. | \[Z{{n}^{2+}}\] |
| Answer» C. \[M{{g}^{2+}}\] | |
| 3645. |
Fe\[{{(OH)}_{3}}\] can be separated from \[Al{{(OH)}_{3}}\] by addition of |
| A. | Dil. HCl |
| B. | NaCl solution |
| C. | NAOH solution |
| D. | \[N{{H}_{4}}Cl\] and \[N{{H}_{4}}OH\] |
| Answer» D. \[N{{H}_{4}}Cl\] and \[N{{H}_{4}}OH\] | |
| 3646. |
Which of the following will not give positive chromyi chloride test? |
| A. | Copper chloride,\[CuC{{l}_{2}}\] |
| B. | Mercuric chloride, \[HgC{{l}_{2}}\] |
| C. | Zinc chloride,\[ZnC{{l}_{2}}\] |
| D. | Anilinium chloride, \[{{C}_{6}}{{H}_{5}}N{{H}_{3}}Cl\] |
| Answer» C. Zinc chloride,\[ZnC{{l}_{2}}\] | |
| 3647. |
Which of the following sets contains only thermoplastics? |
| A. | PVC, PMMA, polystyrene |
| B. | Polythene, Bakelite, nylon-6 |
| C. | Glyptal, Melmac, PAN |
| D. | Polypropylene, urea-formaldehyde, Teflon |
| Answer» B. Polythene, Bakelite, nylon-6 | |
| 3648. |
In the process of forming 'mercerised cellulose' the swelling of cellulose is caused by |
| A. | Water |
| B. | \[N{{a}_{2}}C{{O}_{3}}\] |
| C. | conc.\[NaOH\] |
| D. | cone. \[HCl\] |
| Answer» D. cone. \[HCl\] | |
| 3649. |
Which of the following is resistant to boiling aqua regia? |
| A. | Polythene |
| B. | Perspex |
| C. | Teflon |
| D. | Bakelite |
| Answer» D. Bakelite | |
| 3650. |
Which of the following is used in vulcanization of rubber? |
| A. | \[S{{F}_{6}}\] |
| B. | \[C{{F}_{4}}\] |
| C. | \[C{{l}_{2}}{{F}_{2}}\] |
| D. | \[{{C}_{2}}{{F}_{2}}\] |
| Answer» B. \[C{{F}_{4}}\] | |