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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 801. |
The triad consisting of ferrous metals isA. Fe, Ni, MnB. Fe, Cu, AgC. Fe, Co, NiD. Fe, Ni, Ag |
| Answer» Correct Answer - C | |
| 802. |
Calculate the magnetic momentof `Ni^(2+)`. |
| Answer» For `Ni^(2+)= 3d^(8) Hence,`n=2 ,=sqrt(n(n+2))= sqrt(2(2+2))= sqrt(8)=2.84BM.` | |
| 803. |
In the process of extraction of gold. Roasted gold ore `+CN^(-)+H_(2)O overset(O_(2))rarr [X]+OH^(-)` `[X]+Znrarr [Y]+Au` Identify the complexes `[X] ` and `[Y]`.A. `X=[Au(CN)_2]^(-) , Y=[Zn(CN)_4]^(2-)`B. `X=[Au(CN)_4]^(3-) , Y=[Zn(CN)_4]^(2-)`C. `X=[Au(CN)_2]^(-) , Y=[Zn(CN)_6]^(2-)`D. `X=[Au(CN)_4]^(-) , Y=[Zn(CN)_4]^(2-)` |
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Answer» Correct Answer - A `Au+4CN^(-) + H_2O + 1/2 O_2 to 2[Au(CN)_2]^(-) + 2OH^(-)` `2[Au(CN)_2]^(-) + Zn to [Zn(CN)_4]^(2-) + 2Au` |
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| 804. |
Erbium shows was oxidations stateA. only `+4`B. `+3, +4`C. only `+3`D. `+2,+3` |
| Answer» Correct Answer - C | |
| 805. |
Silver fluoride is fairly soluble in water. |
| Answer» True: Hydration energy of Agf is higher than its lattice energy. Therefore it is soluble in water, but chloride, bromide and iodide of silver are not soluble in water. | |
| 806. |
Silver jewellery items tarnish slowly in air due to their reaction with ____. |
| Answer» Silver jewellery items tarnish slowly in air due to their reaction with `H_2S` black-coloured silver sulphide is formed. | |
| 807. |
Among the divalent cations in the first transition series, manganese exhibits maximum paramagnetic character. Explain. |
| Answer» `Mn^(2+)` ion has `3d^(5)` conifguration and has a maximum of five unpaired electrons . Therefore, it exhibits maximum paramagnetic character among athe divalent cations of first transition series. | |
| 808. |
Which of the following `M^(4+)` cations does not have stable electronic configuration ?A. `Ce ^(4+)`B. `Nd^(4+)`C. `Tb ^(4+)`D. Both a and b |
| Answer» Correct Answer - B | |
| 809. |
Which transition metal has lowest density?A. ScB. TiC. ZnD. La |
| Answer» Correct Answer - a | |
| 810. |
Which one of the following forms of iron can give other forms of iron?A. Wrought ironB. SteelC. Pig ironD. Cast iron |
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Answer» Correct Answer - C The iron produced in the blast furnace is known as pig iron. |
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| 811. |
Actinoids possessA. variable valencyB. 12 elementsC. all synthetic elementsD. only short-lived isotopes |
| Answer» Correct Answer - A | |
| 812. |
Paramagnetic ion isA. `Sc^(+3)`B. `Ti^(+3)`C. `Cu^(+1)`D. `Zn^(+2)` |
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Answer» Correct Answer - B `Ti^(3+) to [Ar] 4s^0 3d^1 to` one unpaired `e^(-) therefore` Paramagnetic |
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| 813. |
`Fe^(3+)` is paramagneticA. three unpaired electronsB. five unpaired electronsC. four unpaired electronsD. none of the above |
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Answer» Correct Answer - C `Fe^(2+) to [Ar] 4s^0 3d^4 to ` Four unpaired `e^-` |
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| 814. |
Which of the following is used as a white pigment?A. ZnOB. FeOC. NiOD. CuO |
| Answer» Correct Answer - A | |
| 815. |
Lanthanide contraction is caused due to -A. The appreciable shielding on outer electrons by 4f electrons from the nuclear chargeB. The appreciable shielding on outer electrons by 5d electrons from the nuclear chargeC. The same effective nuclear charge from Ce to LuD. The poor shielding on outer electrons by 4 f electrons from the nuclear charge |
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Answer» Correct Answer - B 4f electrons have poor shielding effect . `therefore` It leads to lanthanide contraction |
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| 816. |
Which of the following has all of its electrons paired ?A. `Pr ^(3+)`B. `Ce ^(3+)`C. `Tb ^(4+)`D. none of these |
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Answer» Correct Answer - D `Pr^(3+)` has figuration `(4f^(2)),` 2 unpaired electrons. `Ce^(3+)(4f^(1))` configuration, 1 unpaired electrons. `Tb ^(4+)(4f^(7))` configuration , 1 unpaired electrons. `Tb^(4+) (4f^(7))` configuration, 7 unpaired electrons. All ions does not have paired electrons. |
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| 817. |
In vapour state `Cu(NO_3)_2` and `Cu_2(CH_3COO)_4.2H_2O` exist asA. Dimer, monomerB. monomer,dimerC. monomer, monomerD. dimer, dimer |
| Answer» Correct Answer - b | |
| 818. |
The outer electronic coonfiguration of cerium isA. `6s^(2), 4f^(1), 5d^(1)`B. `6s^(2), 4f^(2), 5d^(0)`C. `6s^(2), 4f^(7), 5d^(1)`D. `6s^(2), 4f^(13), 5d^(0)` |
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Answer» Correct Answer - B Most accepted electronic configuration cerium is `6s^(2), 4f^(2), d^(0).` It is due to 4f orbitals has lower energy that 5d orbitals. |
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| 819. |
The oxidation state of iron in `[Fe(H_(2)O)_(5)NO]^(2+)` isA. 1B. 2C. 3D. 4 |
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Answer» Correct Answer - A `H_(2)O` is a neutral ligand but NO possesses +1 oxidation. State in the compound of Fe. Hence, oxidation state of Fe in the given compound is calculated as `x + 0+1=2, x=+1` |
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| 820. |
Which of the following is used as a white pigment?A. `ZnO`B. `Na_2ZnO_2`C. `ZnS`D. `ZnCO_3` |
| Answer» Correct Answer - a | |
| 821. |
White vitriol isA. `CuSO_4.5H_2O`B. `FeSO_4.7H_2O`C. `ZnSO_4.7H_2O`D. `NiSO_4.5H_2O` |
| Answer» Correct Answer - c | |
| 822. |
Green vitriol isA. ferrous sulphateB. tin oxideC. zinc oxideD. ferrous carbonate |
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Answer» Correct Answer - A `FeSO_(4). 7H_(2)O` is known as green vitriol. |
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| 823. |
Which of the following is used in preparation of optical glass of camera having high refractive index ?A. Ceric compoundsB. `CeO_2`C. Oxides oflanthanoidsD. Gadolinium sulphate |
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Answer» Correct Answer - C `CeO_2` is used |
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| 824. |
The aqueous solution of `CuCrO_(4)` is green because it contains:A. green `Cu^(2+)` ionsB. green `CrO_(4)^(2-)` ionsC. blue `Cu^(2+)` ions and green `CrO_(4)^(2-)` ionsD. blue `Cu^(2+)` ions and yellow `CrO_(4)^(2-)` ions |
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Answer» Correct Answer - D `("aqueous solution")Cu^(+2) to` Blue `("aqueous solution") CrO_(4)^(-2) to` yellow Blue `+` yellow `to` green |
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| 825. |
Usually lanthanides formA. ionic bondB. covalent bondC. co-ordinate bondD. hydrogen bond |
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Answer» Correct Answer - A Forms ionic compounds `therefore` ionic bonds |
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| 826. |
Which of the following transition metal ions has highest magnetic moment ?A. `Cu^(2+)`B. `Ni^(2+)`C. `Co^(2+)`D. `Fe^(2+)` |
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Answer» Correct Answer - D More the number of unpaired d-electrons , more is the magnetic moment `{:(Cu^(2+)-3d^9, "No. of unpaired electrons=1"),(Ni^(2+)-3d^8, "No. of unpaired electrons=2"),(Co^(2+)-3d^7, "No. of unpaired electrons=3"),(Fe^(2+)-3d^6, "No. of unpaired electrons=4"):}` |
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| 827. |
Lanthanide series belongs toA. 3rd period and group 2B. 4th period and group 4C. 5th period and group 3D. 6th period and group 3 |
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Answer» Correct Answer - D Lanthanoids - period 6, group 3, position in periodic table. |
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| 828. |
The f-block elements are also called asA. Transition elementB. R are earth elementC. Representative elementD. Inner transition elements |
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Answer» Correct Answer - D f-block elements are inner transition elements as last `e^-` enter prepenultimate f sub-shell |
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| 829. |
Molecular mass of `KMnO _(4)` isA. 158B. 294C. 198D. 134 |
| Answer» Correct Answer - A | |
| 830. |
Lanthanide series belongs toA. sixth periodB. fifth periodC. seventh periodD. d - block elements |
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Answer» Correct Answer - A Lanthanoids belongs to sixth period `6s^2 5d^("1 or 0") 4f^(1-14)` |
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| 831. |
Which of the following elements shows maximum number of different oxidation states in its compounds ?A. EuB. LaC. GdD. Am. |
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Answer» Correct Answer - D (d) Eu=+2, + 3, La = +3 Gd= + 3, Am= +2, +3, +4, +5`. |
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| 832. |
In Which case (s), there is change in oxidation number ?A. Aqueous solution of `CrO_(4)^(2-)` is acidifiedB. `SO_(2)` gas is passed through acidified `Cr_(2)O_(7)^(2-)` solutionC. `Cr_(2)O_(7)^(2-)` solution is made alkalineD. `CrO_(2)Cl_(2)` is is dissolved in NaOH. |
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Answer» Correct Answer - B (a) `2overset(+6)(Cr)O_(4)^(2-)+2H^(+)rarroverset(+6)Cr_(2)O_(7)^(2-)+H_(2)O " "("no change")` `overset(+6)Cr_(2)O_(4)^(2-)+3overset(+4)SO_(2)+2H^(+)rarr2overset(+3)Cr^(3+)+3overset(+6)SO_(4)^(2-)+H_(2)O" "("change")` `overset(+6)Cr_(2)O_(7)^(2-)+2OH^(-)rarr2overset(+6)CrO_(4)^(2-)+H_(2)O" "("no change")` `overset(+6)CrO_(2)Cl_(2)+2NaOHrarrNaoverset(+6)CrO_(4)+2HCl" "("no change")`. |
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| 833. |
Total number of reagents give below reacted with `KI_((aq))` to produce `I_(2):` `CuSO_(4)" "Hg(NO_(3))_(2)` `"Concentrate"H_(2)SO_(4)"Concentrate"H_(3)PO_(4)` `KMnO_(4)//H^(+)" "K_(2)Cr_(2)O_(7)//H^(+)` `Cl_(2)` water acidify bleaching powder `Pb(NO_(3))_(2)NaNo_(2)+HCl("dil.")` |
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Answer» Correct Answer - 3 `I^(-)` ions are oxidised to `I_(2)` on reacting with an oxidising agent. The oxidising agents among the following are : `2Cu^(2+)+4I^(-) to Cu_(2)I_(2)+I_(2)` `{:(2MnO_(4)^(-)+16H^(+)+10I^(-)),(" "darr),(2Mn^(2+)+5I_(2)+8H_(2)O),(Cr_(2)O_(7)^(2-)+14H^(+)+6I^(-)),(" "darr),(overset(3+)(2Cr)+7H_(2)O+3I_(2)):}` |
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| 834. |
In the d-block, the elements which do not generally show the characteristics of transition elements include `"….................., …..................."` and `"…...................."` |
| Answer» Correct Answer - zinc, cadmium, mercury | |
| 835. |
Which set of transition series of the d-block is CORRECT?A. 3d,4d,5d,6dB. 2d,3d,4d,5dC. 3d,5d,6d,7dD. 4d,5d,6d,7d |
| Answer» Correct Answer - A | |
| 836. |
Stable oxidation state of Berkelium isA. `+3`B. `+4`C. `+2`D. `+6` |
| Answer» Correct Answer - B | |
| 837. |
The most abundant transition metal isA. FeB. CuC. ZnD. Ni |
| Answer» Correct Answer - A | |
| 838. |
The elements after uranium are called:A. actinidesB. transition elementsC. transuranicelementsD. lanthanum |
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Answer» Correct Answer - C Post uranium elements (atomic no. gt 92) are prepared from U are transuranic elements |
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| 839. |
The outer elecftronic configuration of plutonium in `+6` oxidatino state isA. `7s^(0), 5f^(5), 6d^(0)`B. `7s^(0), 5f^(1), 6d^(0)`C. `7s^(0), 5f^(2), 6d^(0)`D. `7s^(0), 5f^(4), 6d^(0)` |
| Answer» Correct Answer - C | |
| 840. |
Which one of the following pair of ions are isoelectronic?A. `Zn^(+2), Cu^(+1)`B. `Fe^(+2), Fe^(+3)`C. `Cu^(+2), Cu^(+1)`D. `Mn^(+2), Mn^(+2)` |
| Answer» Correct Answer - A | |
| 841. |
The stable O.S. of uranium isA. `+3`B. `+4`C. `+5`D. `+6` |
| Answer» Correct Answer - D | |
| 842. |
`Cf^(3+)` is isoelectronic withA. `Md^(4+)`B. `Am^(4+)`C. `Pu^(7+)`D. `Es ^(4+)` |
| Answer» Correct Answer - D | |
| 843. |
`Np^(7+)` isA. oxidising agentB. reducing agnetC. coloured ionD. all of these |
| Answer» Correct Answer - C | |
| 844. |
Oxidation state of uranium in `UO _(2)^(2+)` isA. `+4`B. `+5`C. `+6`D. `+7` |
| Answer» Correct Answer - C | |
| 845. |
Electronic configuration of `Pu^(7+)`A. `7s^(0), 5f^(14), 6d^(0)`B. `7s^(0), 5f^(3), 6d^(0)`C. `7s^(0) , 5f^(0) ,6d^(0)`D. ` 7s^(0), 5f^(1), 6d^(0)` |
| Answer» Correct Answer - B | |
| 846. |
The most stable oxidation state of thorium isA. `+3`B. `+4`C. `+5`D. `+6` |
| Answer» Correct Answer - B | |
| 847. |
Which one of the following is an electronic configuration of thorium?A. `[Rn] 7s^(2), 5f^(0), 6d^(2)`B. `[Rn] 7s^(2), 5f^(1), 6d^(1)`C. `[Rn] 7s^(1), 5f^(3) , 6d^(1)`D. `[Rn] 7s^(1), 5f^(4), 6d^(0)` |
| Answer» Correct Answer - A | |
| 848. |
Oxidation number of osmium `(Os)` in `OsO_(4)` isA. 4B. 6C. 7D. 8 |
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Answer» Correct Answer - D Oxidation state of Os in `OsO_4` is +8 . `O-8 " " OsO_4 " " C-2` |
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| 849. |
Assertion `:` The highest oxidation state of osmium is `+8`. Reason `:` Osmium is a 5d -block element.A. Both assertion and reason are true and reason is the correct explanation of the assertion .B. Both assertion and reason are true but reason is not the correc explanation of assertion.C. Assertion is not true for reason is trueD. Both assertion and reason are false. |
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Answer» Correct Answer - b Correct explanation. Osmium has the electronic configuration `5d^(6) 6s^(2) `. As 5d and 6s are close in energy , all the 8 electrons can participate in bonding. |
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| 850. |
Oxidation number of osmium `(Os)` in `OsO_(4)` isA. `+4`B. `+6`C. `+7`D. `+8` |
| Answer» Correct Answer - D | |