Explore topic-wise InterviewSolutions in Current Affairs.

This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.

1.

How many of the following statements are correct ? (i)Among sp^3d,sp^3d^2 and sp^3d^3 hybridisation, the maximum number of 90^@ angles between bond pair bond pair of electrons is observed in sp^3d^2 hybridisation . (ii)Among SF_4,CF_4 and XeF_4, interatomic bond angle of 109^@28' is observed only in SF_4. (iii)Among N_2F_4,N_2F_2, and N_2 , the largest N-N bond length is found in N_2F_4. (iv)Among NF_3, NO_3^(-),BF_3,H_3O^+ and NH_3, [NH_3, H_3O^+] and [BF_3, NO_3^(-)] are isostructural pairs. (v)Among NH_3, PH_3, AsH_3, and SbH_3, SbH_3 has smallest bond angle. (vi)Among SbCl_3, SbBr_3, and Sbl_3 , Sbl_3 has the largest bond angle.

Answer»


Solution :(i)BOND pair-bond pair bond ANGLES in `sp^3d^2` are 12.

(ii)`109^@28'` bond angle is observed only in `CF_4` (TETRAHEDRAL GEOMETRY)

(iii)`N-=N(~~1.1CÅ)ltFN=NF(~~1.21Å)lt`

`(1.49pm0.004)`
(iv)`BF_3` and `NO_3^(-)` ,both trigonal planar , `NF_3` and `H_3O^+`,both trigonal pyramidal.
(v)ORDER is `{:(NH_3gtPH_3gtAsH_3gtSbH_3),(106^@6" " 93.8^@ " " 91.83^@ " " 91.3^@):}`
(v)Order is `{:(Sbl_3gtSbBr_3gtSbCl_3),(99^@"" 98.2^@ "" 97.1^@):}`
Discussion
2.

How many of the following statements are correct ? (a)BeO is amphoteric in nature ltbgt (b)LiHCO_3 is not found in solid state. ( c)K_2O_2 is diamagnetic but KO_2 is paramagnetic (d)Hydrated magnesium chloride on heating in dry air gives anhydrous MgCl_2 (e)AlCl_3 is soluble in excess of NaOH and form sodium meta aluminate (f)Anhydrous potassium nitrate on heating with potassium metal gives potassium oxide and nitrogen gas (g)Lithium chloride is highly soluble in water.

Answer»


SOLUTION :(a),(b), (E) & (f) are correct.
(b)`LiHCO_3oversetDeltatoLi_2CO_3+H_2O+CO_2`
(d)`MgCl_2 . 6H_2O to MgO+HCl+H_2O`
(e)`AlCl_3+4NaOH("EXCESS")to NaAlO_2+2H_2O+3NaCl`
(f)`KNO_3+K to K_2O+N_2`
Discussion
3.

Howmany of the following statements are correct? (a) Delta at the mouth of a river is formed due to the coagulation of the colloidal sea water by the electrolytes present in the river water. (b) Artifical rain is caused by the coagulation of colloidal water droplets in the clouds by an electrolyte. (c ) Cotrell precipitator is used in the precipitation of the colloidal waste in the sewage water. (d) Cheese is an example of solid foam. (e) A colloid formed by adding small amount of AgNO_(3) to KI solution is negatively charged. (f) Micelles are formed only below the Kraft temperature (T_(k)) (g) Mixing of hydrated ferric oxide sol and arsenious sulphide sol bring them in precipitated form. (h) An oil in water emulsion can be diluted by addition of water. (i) Emulsions show Brownian motion and Tyndall effect.

Answer»


ANSWER :4
Discussion
4.

How many of the following statements are correct?

Answer»

All halogens form oxyacid
Only CHLORINE and BROMINE form oxyacids
All halogens EXCEPT FLUORINE form oxyacid
Only iodine forms OXY acid

Solution :All halogens forms oxi-acids.
Discussion
5.

How many of the following statement/s is/are correct? (1). For isothermal process DeltaE and DeltaH are 0. (2). On increasing temperature pK_(w) of water decreases. (3). For adiabatic process DeltaS is always 0. (4). Indicator methyl orange can be used for titration between strong acid and weak base. (5). At triple point liquid. vapour and solid state are in simultaneous equilibrium with one another. (6). DeltaH_(f)^(@) of D_(2) (gas) is zero. (7). Molal elevation constant (K_(b)) depends upon nature of solute. (8). Be does not give flame test. (9). Solubility of AgCN increases in KCN solution.

Answer»


ANSWER :6
Discussion
6.

How many of the following statement are true about the cathode rays? (i) Path of travelling is straight from the cathode with a very high velocity as it produces shadow of an object placed in its path (ii) Rays consist of material particle. (iii) They deflect towards negative end of the electrode. (iv) They produce yellow glow when the glass will beyond anode. (v) Cathode rays penetrate through thin sheets of aluminium and metals. (vi) They affect the photographic plates (vii) The ratio of charge (e) to mass (m) i.e. charge//mass is same for all cathode rays irrespective of the gas used in the tube. e//m=1.76xx10^(11) Ckg^(-1) (viii) Cathode rays are visible at low voltage.

Answer»


ANSWER :5
Discussion
7.

How many of the following statement are correct ? (1) CF_(4) can be prepared by reaction between SiC and F_(2). (2) In SiF_(4) Si-F observed bond length is shorter than actual Si-F bond length (3) (C_(2)F_(4))_(n) is known as PTFE. (4) C Cl_(4) react with Anyelrony HF, gives Chloro Flouro carbon (C Cl_(2)F_(2)) (5) C Cl_(4) can hydrolysis under super heating conditious. (6) Hydrolysis of SiF_(4) is not complete of SiF_(4) is partially hydrolysis.

Answer»

SOLUTION :(1)`SiC+F_(2)to SiF_(4)+CF_(4)`
(2)Because of `dpi-ppi` BACK bonding in `SiF_(4)`
(3)`PTFE=` Poly tetra flouro ethene
(4)`C Cl_(4) +HF to C Cl_(2)F_(2)+HCl`
(5)`C Cl_(4)underset("Super heating (steam)")overset(+H_(2)O) to COCl_(2)+HCl`
(6)`SiF_(4)+F^(-)to [SiF_(6)]^(-2)` (`F^(-)` forms in `I^(ST)` staoe gtdriksus if `Si F_(4))`
Discussion
8.

How many of the following statement is/are corret regarding silver extraction process.

Answer»

When the lead -silver alloy is RICH in lead ,lead is removed by the cupellion process
When the lead -silver alloy is rich in lead ,lead is removed by PARK,E or pattinsion ,s process
Zinc FORMS ann alloy with lead ,g=from which lead is separated by distillation
Zinc forms an alloy with silver ,from which zinc is sepatated by distillation

Answer :3
Discussion
9.

How many of the following statement is/are ture for calcination of metal ore ?

Answer»

(i) It MAKES the ore more POROUS
(II) the opre heated to a tempature just its melting point
hydrated oxides lose their WATER of crystlliation
Impurities of S,As and Sb are

ANSWER :2
Discussion
10.

How many of the following species would have C-O bond length longer than that of free CO molecule. [V(CO)_(6)]^(-), [Ti(CO)_(6)]^(2-), [CO(NH_(3))_(3)(CO)_(3)]^(3+), [Cr(CO)_(6)], HMn(CO)_(5), Mn_(2)(CO)_(10), [Fe(CN)_(5)(CO)]^(3-), CO_(2), CO_(3)^(2-) [Write your answer as 0003, if it is 3.]

Answer»


SOLUTION :All have longer BOND LENGTH than FREE CO MOLECULE.
Discussion
11.

How many of the following species can act as both bleaching agent and reducing agent O_(3),H_(2)O_(2),SO_(2),HCl,SO_(3)

Answer»


ANSWER :C
Discussion
12.

How many of the following species have no d-orbital s involved in their hybridisation XeF_(2),snF_(2) PbCl_(2),SF_(4),C Cl_(4),BF_(3),SO_(2)Cl_(2),XeO_(2)F_(2),XeOF_(4),POCl_(3)

Answer»
Discussion
13.

How many of the following species have reducing properties ? NH_(3),PH_(3),H_(3)PO_2,H_(3)PO_3,H_(3)PO_(4),LiA//H_(4),BH_3

Answer»


Solution :To act reducing AGENT central should POSSES volence ELECTRONS (or) Hydrogen should by `H^(Theta)` state so : `NH_(3),PH_(3),H_(3)PO_(2),H_(3)PO_(3),LiAIH_(4),BH_(3)- ` are reducing agents
Discussion
14.

How many of the following species have sp^(2) hybrid atoms? Diamond, Graphite, C_(60), (SiH_(3))_(3)N, AlCl_(3), Al_(2)(CH_(3))_(6), SiCl, H layered BN, borazine.

Answer»


ANSWER :7
Discussion
15.

How many of the following salts impart characteristic colours to the Bunsen flame ? NaCl, KCl, CuCl_(2), BaCl_(2), CaCl_(2),SrCl_(2), ZnCl_(2), MgCl_(2),AlCl_(3)

Answer»


Solution :`NaCl`-Golden yellow ,`KCl`-Lilac , `CuCl_(2)`-bluish-GREEN,`BaCl_(2)`-Apple green , `SrCl_(2)`-Crimson , `CaCl_(2)`-BRICK RED.
Discussion
16.

how many of the following species are aromatic in nature cyclopentadienyl cation, cyclopentadienyl anion, tropylium cation, azulene, cyclopropenyl cation, tetrahydrofuran, cyclooctatetraene, furan , cycloheptatriene

Answer»

SOLUTION :Cyclopentadienyl ANION, tropylium CATION , AZULENE, cyclopropenyl cation, FURAN
Discussion
17.

How many of the following salts impart characteristic colours to the Bunsen flame ltBrgt NaCl,KCl,CuCl_(2),BaCl_(2),CaCl_(2),SrCl_(2),ZnCl_(2),MgCl_(20,AlCl_(3)

Answer»

Solution :`NaCl`-GOLDEN YELLOW, `KCl-`Licac, `CuCl_(2)-`bluish-green, `BaCl_(2)`-Apple green, `SrCl_(2)`-B Crimson,`CaCl_(2)`-brick RED.
Discussion
18.

How many of the following salts give precipitate with aq. NaOH solution which dissolve in excess of the reagent? CdSO_(4),Pb(NO_(3))_(2), CrCI_(3). MnCI_(2). ZnSO_(4). CuSO_(4). Bi(NO_(3))_(3), SnCI_(4)

Answer»


SOLUTION :`Pb(NO_(3))_(2), CrCl_(3), ZnSO_(4)` and `SnCl_(4)`
`Pb(NO_(3))_(2) +2NaOHrarrunderset("White ppt")(Pb(OH))_(2)+2NaNO_(3)`
`Pb(OH)_(2) + 2NaOH rarr Na_(2)PbO_(2)+2H_(2)O`
`CrCl_(3)+3NaOH rarr underset("Green ppt")(Cr((OH)_(3))+3NaCl`
`Cr(OH)_(3)+NAOH rarr NaCrO_(2)+2H_(2)O`
`ZnSO_(4)+2NaOH rarr underset("White ppt")(ZN((OH)_(2))+Na_(2)SO_(4)`
`Zn(OH)_(2)+2NaOH rarrNaZnO_(2)+2H_(2)O`
`SnCl_(4)+4NaOH rarr underset("White ppt")(Sn(OH)_(4))+4NaCl`
`Sn(OH)_(4)+2NaOH rarr Na_(2)SnO_(3)+3H_(2)O`
Discussion
19.

How many of the following reagents will not be useful in separating a mixture of Zn^(2+) and Cu^(2+) ? (i) H_(2)S in acid medium (ii) H_(2)S in an alkaline medium (iii) Excess of NaOH solution (iv) NH_(3) solution

Answer»


SOLUTION :In excess amount of NAOH can separate the `Zn^(+2)` and `CO^(+2)`
Discussion
20.

How many of the following refining processesare correctlymatchedwith their element ?

Answer»


ANSWER :6
Discussion
21.

How many of the following reagents can oxidise aqueous iodide to iodine. Acidified K_2Cr_2O_7, Alkaline KMnO_4, CuSO_4 H_2O_2 Cl_2,O_3,FeCl_3 ,HNO_3 "and" Na_2S_2O_3

Answer»


SOLUTION :`K_2Cr_2O_7, KMnO_4,CuSO_4,H_2O_2,Cl_2,FeCl_3, HNO_3`
Discussion
22.

How many of the following reagent would cause symmetrical cleavage in diborane? [ If your answer is 2 then writ the answer as 0002].

Answer»


ANSWER :`0006`
Discussion
23.

How many of the following reactions would have HCl as one ofthe products ? (a)CH_4+CI_2to(b) FeSO_4 + H_2SO_4 + Cl_2 to (c) l_2+Cl_2+H_2O to(d) Cl_2+H_2O(e)H_2O+SO_2+Cl_2 to(f) SO_3+Cl_2 to (g) NaCI(aq)overset("Electrolysis")to(h) Cl_2O_7+H_2O to (i)Cl_2+NaOH(conc) to

Answer»


ANSWER :5
Discussion
24.

How many of the following reaction yield POCl_(3) ? {:((i) PCl_(3) + O_(2)rarr,(ii) PCl_(5) + CO_(2) rarr,(iii) PCl_(5) + CH_(3)COOH rarr),((iv)PCl_(5) + H_(3)BO_(3) rarr,(v) PCl_(3) + SO_(2)Cl_(2) rarr,(vi) P_(4)O_(10) + NaCl rarr),((vii) PCl_(5) + H_(2)O rarr,(viii) PCl_(5) + SO_(2)rarr,(ix) PCl_(3) + SO_(3) rarr):}

Answer»


Solution :`{:((i) PCl_(3) + O_(2) RARR POCl_(3),(ii) PCl_(5) + CO_(2) rarr " No reaction "),((iii) PCl_(5) + CH_(3)COOH rarr CH_(3)COCl + POCl_(3) + HCl,(vi) PCl_(5) + H_(3)BO_(3) rarr POCl_(3) + B_(2)O_(3)),((v) PCl_(3) + SO_(2)Cl_(2) rarr PCl_(5) + SO_(2),(vi) P_(4)O_(10) + NACL rarr POCl_(3) + NaPO_(3)),((vii) PCl_(5) + H_(2)O rarr POCl_(3) + 2HCl,(viii) PCl_(5) + SO_(2) rarr SOCl_(2) + POCl_(3)),((ix) PCl_(3) + SO_(3) rarr POCl_(3) + SO_(2),):}`
Discussion
25.

How many of the following quantities show increase in their value of increasing temperature? a. Extent of physisorption of gases on solids. b. Electrical conductivity of an electrolyte solution. c. Electrical conductivity of an electrolyte solution. d. Ionic product of water. e. Vapour pressure of a pure and liquid. f. Vapour pressure of an ideal solution which follows Rault's law, (keeping composition same) g. Solubility of gases in liquids. h. Reducing power of carbon monoxide for extraction of metals Correct answer:

Answer»

`5`
`4`
`6`
`3`

Solution :Conductivity of electrolye INCREASES at higher temperature DUE to higher degree of dissociation and greater mobility of ions. Reducing power of `CO` DECREASES with increasing temperature as its oxidation becomes less spontaneous.
Discussion
26.

How many of the following reactions can leads to form ester.

Answer»


SOLUTION :I,II,III, and IV can FORM ESTERS
Discussion
27.

How many of the following pairs of ions can be separated by H_(2)S in dilute HCl? Bi^(3+) and Sn^(4+),Al^(3+) and Hg^(2+),Cd^(2+) and Zn^(2+),Fe^(3+) and Cu^(2+),As^(3+) and Sb^(3+)

Answer»


Solution :(1)`Al^(3+)` and `Hg^(2+) underset(H_(2)S) OVERSET(H^(+)) to HgS DARR ("black")+ Al^(3+)` (in solution)
(2)`Cd^(2+)` and `Zn^(2+) underset(H_(2)S) overset(H^(+)) to CdS darr ("yellow")+ Zn^(2+)` (in solution)
(3)`FE^(3+)` and `Cu^(2+) underset(H_(2)S) overset(H^(+)) to CuS darr ("black")+ Fe^(3+)` (in solution)
Discussion
28.

How many of the following pairs of ions can be separated by H_2S in dilute HCl ? Bi^(3+) and Sn^(4+),Al^(3+) and Hg^(2+),Cd^(2+) and Zn^(2+),Fe^(3+) and Cu^(2+), As^(3+) and Sb^(3+)

Answer»


Solution :(1)`Al^(3+) and HG^(2+) underset(H_2S)overset(H^(+))to HgSdarr(black)+Al^(3+)`(in solution)
(2)`CD^(2+) and Zn^(2+) underset(H_2S)overset(H^(+))to CdSdarr(YELLOW)+Zn^(2+)`(in solution)
(3)`Fe^(3+) and Cu^(2+) underset(H_2S)overset(H^(+))to CuSdarr(black)+Fe^(3+)`(in solution)
Discussion
29.

How many of the following parameters/properties are greater for diamond as compared to graphite ? Denisty, Electrical resistivity, Thermal conductivity, stability, % s-character for hybridised orbitals, Hardness, Bond angle, C-C (bond length), Standard enthalpy of formation.

Answer»

Solution :DENSITY, Electrical RESISTIVITY, THERMAL conductivity, Hardness, `C-C`(bond LENGTH),`DeltaH_(f)^(@)`
Discussion
30.

How many of the following pairs are conjugate acid/base pairs? HCl,Cl^(-) KH,KCl H_(2)SO_(4),Na_(2)SO_(4) NaHS,Na_(2)S CH_(3)COOH,CH_(3)COOH_(2)^(+) Na_(2)CO_(3),NaHCO_(3) NH_(3),NH_(4)Br HCl,ClOH Aniline, anilinium

Answer»


ANSWER :6
Discussion
31.

How many of the following order of bond energies are correct. (i) C-C gt Si-Si ,(ii) C-O gt Si-O ,(iii) C-FgtSi-F , (iv) C-FgtSi-F ,(v) C-HgtSi-H, (vi) Si-Cl gt C-Cl (vii) Si-SigtC-Si ,(viii) C-BrgtSi-Br

Answer»


SOLUTION :N//A
Discussion
32.

How many of the following on reductive ozonolysis will give only glyoxal 1,3-butadiene, ethylene, acetylene , o-xylene, m-xylene, xylene, benzene, cyclobutadiene, cyclooctatetraene

Answer»


SOLUTION :ACETYLENE, BENZENE , CYCLOBUTADIENE, cyclootatetraene
Discussion
33.

How many of the following obey's Sidgwick EAN rule ? (a) K_(4)[Fe(CN)_(6)],""(b) K_(3)[Fe(CN)_(6)], (c ) Mn_(2)(CO)_(10),""(d) [Fe(H_(2)O)_(5)NO]SO_(4), (e ) Na_(2)[Fe(CN)_(5)NO],""(f) [Co_(2)(CO)_(8)], (g) [Fe(pi-C_(5)H_(5))_(2)]

Answer»


SOLUTION :(a),(C ), (E ),(F),(G)
Discussion
34.

How many of the following of ethrs cannot be prepared by Williamson's synthesis CH_(3)OC_(2)H_(5),(C_(6)H_(5))_(2)O,C_(6)H_(5)OCH_(3),C_(6)H_(5)OC_(2)H_(5) (CH_(3))_(3)COC(CH_(3))_(3), (C_(2)H_(5))_(2)O,C_(6)H_(5)CH_(2)OC_(6)H_(5), (CH)_(3))_(3)COCH_(3),(CH_(3))_(3)COCH_(2)CH_(3).

Answer»


SOLUTION :Williamson.s SYNTESIS nequires that the ALKYL HALIDE should be primary and alkoxide may be primary secondary or tertiary. Hence, two ethers which cannot be prepared by williamson.s synthesis are `(C_(6)H_(5))_(2)O,(CH_(3))_(3)COC(CH_(3))_(3)`.
Discussion
35.

How many of the following names are correct according to IUPAC system of nomenclature ? Pent - 3 - yne, Hexa-1, 6-diene,3 - Methylhexa-1, 5-diyne,2 - Ethyl-2-pentene, 1-Methoxyethane-2-ol,4,4,5-Trimethyl hex-1-yne, 1, 2-Dihydroxyethane, Pent-4-en-1-yne.

Answer»


ANSWER :2
Discussion
36.

How many of the following nitrates of metal 'M' decompose on heating similar to as given below in the scheme ? (where, M=Li, Be, Mg,K,Ca,Sr,Na,Rb,Ba). "Metal nitrate"overset("heat")tometal oxide + nitrogen dioxide + oxygen gas

Answer»


SOLUTION :`4LiNO_3 to 2Li_2O + 4NO_2 + O_2`
Other ALKALI metals decompose as given below,
`2NaNO_3 to 2NaNO_2 +O_2`
All alkaline EARTH metals decompose in the same WAY as the `LiNO_3`
Discussion
37.

How many of the following molecles /ion are planar? CO_(3)^(2-), NO_(3)^(-), XeF_(4), XeO_(4), SF_(4), I_(3)^(-), COCl_(2), SO_(3), ClO_(3)^(-), I_(2)Cl_(6) (solid)

Answer»


Solution :The following molecules/ion are planar
`CO_(3)^(2-), NO_(3)^(-), XeF_(4), l_(3)^(-), COCl_(2), SO_(3),l_(2), Cl_(6)` (SOLID)
Discussion
38.

Howmanyof the followingmimerals are oxidesof metals// metalloids .

Answer»


ANSWER :6
Discussion
39.

How many of the following metals can be extracted buy carbon reduction method ? Na,Al,Mg,Sn,Fe,Pb,Zn,Ca

Answer»


ANSWER :4
Discussion
40.

How many ofthe followingmetalscan berefinedbyvapourphaserefining ? Zr, Zn,Cd, Hg, Ni, Co , Pt, Fe, Ti.

Answer»


Solution :3 (THREE, i.e., ZR, Ni, TI)
Discussion
41.

How many of the following may react with SiCl_(4) to produce a non-polar product ? NaH, CH_(3)MgCl, H_(2)O, LiAlH_(4), H_(2)SO_(4)(l),NH_(3), Be

Answer»


Solution :`4NaH+SiCl_(4)to4NaCl+SiH_(4) uarr`(non-polar)
`CH_(3)MgCl+SiCl_(4)toMgCl_(2)+SI(CH_(3))_(4)`(non-polar)
`3H_(2)O+SiCl_(4)to H_(2)SiO_(3)+4HCL`
`LiAiH_(4)+SiCl_(4)to LiCl + AlCl_(3)+SiH_(4)`(non-polar)
`H_(2)SO_(4)(l)+SiCl_(4) to ` no reaction
`NH_(3)+SiCl_(4) to ` Polymeric SUBSTANCE
`2Be+SiCl_(4) to 2BeCl_(2)+Si`(non-polar)
Discussion
42.

How many of the following liberate colured vapour/gas with concentrated H_2SO_4 ? KCl(s)+K_2Cr_2O_7(s),KNO_2(s),Kl(s), KBr(s), KCl(s) KBr(s)+MnO_2(s),KNO_3,KCl(s)+MnO_2,K_2SO_3

Answer»


Solution :(i)`4Cl^(-)+Cr_2O_7^(2-)+6H^(+)to2CrO_2Cl_2uarr`(deep red) +`3H_2O`
(ii)`NO_2^(-)+H^(+)toHNO_2 , 3HNO_2 to HNO_3+Nouarr+H_2O`
`2NOuarr+O_2uarr to NO_2uarr`(BROWN)
(iii)`3I^(-)+2H_2SO_4 to I_3^(-)uarr` (violet) +`SO_4^(2-)+2H_2O+SO_2`
(iv)`2KBr+2H_2SO_4toBr_2uarr` (reddish brown) +`SO_2uarr+NO_4^(2-)+2K^(+)+2H_2O`
(V)`Cl^(-)+H_2SO_4 to HCl uarr` (COLOURLESS) + `HSO_4^-`
(vi)`2KBr+MnO_2+2H_2SO_4 to Br_2uarr("reddish brown")+ 2K^(+)+Mn^(2+)+2SO_4^(2-)+2H_2O`
(vii)`4NO_3^(-)+2H_2SO_4toBr_2uarr("reddish-brown")+2K^(+)+Mn^(2+)+2SO_4^(2-)+2H_2O`
(viii)`KCl+MnO(OH)_2+2H_2SO_4+2Cl^(-) ("brown")to Mn^(2+)+Cl_2uarr` (yellowish green) +`2SO_4^(2-)+3H_2O`
(ix)`SO_3^(2-)+2H^(+)toSO_2uarr` (colourless) +`H_2O`
Discussion
43.

How many of the following may act as buffer ? (a) 20mL 0.2 M -H_(2)CO_(3) solution +10 ml 0.2 M-NaOH solution (b) 20 ml 0.2 M -H_(2)CO_(3) solution +20 ml 0.2 M-NaOH solution (c) 20 mL 0.2 M-H_(2)CO_(3) solution +30 mL 0.2 M-NaOH solution (d) 20 mL 0.2 M - H_(2)CO_(3) solution +10 mL 0.2 M-NaHCO_(3) solution (e) 20 mL 0.2 M -H_(2)CO_(3) solution +10 mL 0.2 M-Na_(2)CO_(3) solution (f) 20 mL 0.2 M -H_(2)CO_(3) solution +20 mL 0.2 M -Na_(2)CO_(3) solution (g) 20 mL 0.2 M -H_(2)CO_(3) solution +30 ml 0.2 M-Na_(2)CO_(3) solution

Answer»


ANSWER :5
Discussion
44.

How many of the following liberate coloured vapour/gas with concentrated H_(2)SO_(4)? KCl(s)+K_(2)Cr_(2)O_(7)(s), KNO_(2)(s),Kl(s), KBr(s),KCl(s) KBr(s)+MnO_(2)(s),KNO_(3),KCl(s)+MnO_(2),K_(2)SO_(3)

Answer»


Solution :(i)`4Cl^(-)+Cr_(2)O_(7)^(2-) +6H^(+) to 2CrO_(2)Cl_(2) uarr ("DEEP red")+3H_(2)O`
(ii)`NO_(2)^(-)+H^(+) to HNO_(2) , 3HNO_(2) to HNO_(3)+NO uarr +H_(2)O`
`2NO uarr +O_(2) uarr to NO_(2) uarr` (BROWN)
(iii)`3l^(-)+2H_(2)SO_(4) to l_(3)^(-) uarr ("violet") +SO_(4)^(2-) +2H_(2)O+SO_(2)`
(iv)`2KBr +2H_(2)SO_(4) to Br_(2) uarr ("reddish brown")+SO_(2) uarr +NO_(4)^(2-) + 2K^(+) + 2H_(2)O`
(v)`Cl^(-)+H_(2)SO_(4) to HCl uarr ("colourless") + HSO_(4)^(-)`
(vi)`2KBr + MnO_(2) + 2H_(2)SO_(4) to Br_(2) uarr ("reddish-brown")+2K^(+)+Mn^(2+)+2SO_(4)^(2+) +2H_(2)O`
(vii)`4NO_(3)^(-) + 2H_(2)SO_(4) to Br_(2) uarr ("reddish-brown") + 2K^(+) +MN^(2+)+2SO_(4)^(2-) + 2H_(2)O`
(viii)`KCL + MnO(OH)_(2) +2H_(2)SO_(4)+2Cl^(-)("brown") to Mn^(2+)+Cl_(2) uarr ("yellowish green") + 2SO_(4)^(2-)+3H_(2)O`
(ix)`SO_(3)^(2-) + 2H^(+) to SO_(2) uarr ("colourless") + H_(2)O`
Discussion
45.

How many of the following is/are the correct match. (i) Photochemical smog: CF_(2)Cl_(2) (common component) (ii) Ozone layer: Protects from the Sun's radiation of wavelength 255 nm (iii) Methamoglobinemioa: Caused by the presenceof greater than 50 ppm of nitrate in drinking water (iv) Ozone layer depletion: CIO^(-)(g) + O(g) to Cl^(-)(g) + O_(2)(g) (one of the reaction involved) (v) DDT: Biodegredable pollutant (vi) Green house gas: Methane.

Answer»


ANSWER :D
Discussion
46.

How many of the following is/are correct order of dipole moment? (A) CH_(3)-FgtCH_(3)-ClgtCH_(3)-BrgtCH_(3)-I (B) H-FgtH-ClgtH-BrgtH-I (C) CH_(3)-ClgtCH_(2)Cl_(2)gtCHCl_(3)gt"CC"l_(4) (D) CH_(2)=CH-Cl lt CH_(3)-CH_(2)-Cl (E) (F) CH_(3)-Cl gt CH_(3)-FgtCH_(3)-Br (G) H-ClgtH-FgtH-Br

Answer»


SOLUTION :`CH_(3)-ClgtCH_(3)=F(mu=qxxd)`
`to SIR` of `NO_(2)`
`CH_(2)=CHClimplies-l` is OPPOSED by `+R` or `CL`
Discussion
47.

How many of the following is not oxidised by O_(3) ? KI, FeSO_(4), KMnO_(4), K_(2)MnO_(4)

Answer»


Solution :Ozone does nto oxidizes `KMnO_(4)`. But it oxidizes `K_(2)MnO_(4)`.
`2KI+H_(2)O+O_(3) to 2KOH+I_(2)+O_(2). 2FeSO_(4)+H_(2)SO_(3) +O_(3) to Fe(SO_(4))_(3)+H_(2)O+O_(2)`
`2K_(2)MnO_(4)+H_(2)O+O_(3) to 2KMnO_(4)+2KOH+O_(2), KMnO_(4)+O_(3) to` no reaction.
Discussion
48.

How many of the following is correctly matched complex ?

Answer»


ANSWER :3(a,B,d)
Discussion
49.

How many of the following ionic compounds have coordination number of either cation or anion equal to 6 or more : ZnS, KCl, K_2O, CsBr, NaBr,CaF_2

Answer»


Solution :ZNS`to` Zinc bende STRUCTURE, C.N. =4
`Kclto` Rock salt, CN=6
`K_2Oto` Antifluorite structure , CN of `K^+=4`
CsBr`to` CN=8
NaBr`to` Rock salt, CN=6
`CaF_2to`FLUORIDE structure, CN of `F^(-)=4CN` of `CA^(2+)=8`
Discussion
50.

How many of the following involves carbon reduction during extraction of metal from ore ? Bauxite to Al implies "Copper pyrites" to Cu Haematile to Fe implies "Galena " to Pb Camallite to Mg implies "Sylvine" to K Cassiterite to Sn implies "Zinc blende" to Zn Silica to Si implies

Answer»


Solution :Haematite `to `FE
Galena `to` Pb
CASSITERITE `to` SN
ZINC blende `to` Zn
SILICA `to` Si
Discussion