Explore topic-wise InterviewSolutions in .

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.

1051.

Which compound/s does not give stable diazotisation product

Answer»

`C_(6)H_(5)NH_(2)`
`C_(6)H_(5)CH_(2)NH_(2)`

Solution :AROMATIC amines gives this `"REA"^(n)`
Discussion
1052.

Which of the following is not true ? In acidic medium KMnO_(4) oxidises :

Answer»

SULPHUR dioxide to sulphur
FERROUS sulphate to ferric sulphate
POTASSIUM iodide to iodine
oxalic ACID to carbon dioxide.

Answer :A
Discussion
1053.

Which one of the following element is used in vulcanization of rubber?

Answer»

OXYGEN
NITROGEN
carbon
SULPHUR

Solution :sulphur
Discussion
1054.

Which of the followig is used as an additive by fire departments under the name Rapid-Water-

Answer»

ETHYLENE glycol
Polyethylene oxide
Epichlorohydrin
Epoxy oxide

Answer :B
Discussion
1055.

Thestructuralformulaof methylaminomethaneis

Answer»

`(CH_(3))_(2) CHNH_(2)`
`(CH_(3))_(2) NH`
`(CH_(3))_(2) CHCH_(2) NH_(2)`
`(CH_(3))_(3) CH_(2) NH`

Solution :follow IUPACRulesfor AMINES
Discussion
1056.

When an oxide of Mn (A) is fused with KOH in the presence of an oxidising agent and dissolved in water, it gives a dark solution of compound (B). Compound (B) disproportionate in neutral or acidic solution to give purple compound (C). Identify A, B, C.

Answer»

SOLUTION :`A=MnO_(2)`
`B=K_(2)MnO_(4)`
`C=KMnO_(4)`
Discussion
1057.

Which of the following, when mixed, will give a solution with pH greater than 7?

Answer»

0.1 M HCl + 0.2 M NaCl
100 mL of 0.2 M `H_(2)SO_(4)` + 100 mL of 0.3 M NaOH
100 mL of 0.1 M `C_(2)H_(4)O_(2)` + 100 mL of 0.1 M KOH
100 mL of 0.1 M HCl + 100 mL of 0.1 M `NaC_(2)H_(3)O_(2)`

ANSWER :C
Discussion
1058.

Which of the following organic compounds answers to both iodoform test and Fehling's test?

Answer»

Ethanol
Methanal
Ethanal
Propanone

Answer :C
Discussion
1059.

What will be the heat of formation of methane, if the heat of combustion of carbon is '-x' kJ, heat of formation of water is '-y' kJ heat of combustion of methane is '-z' kJ?

Answer»

`(-x-y+z)kJ`
`(-x-y+z)kJ`
`(-x-2y-z)kJ`
`(-x-2y+z)kJ`

Solution :`{:((I)C+O_(2)rarrCO_(2),DeltaH=-xkJ),((II)H_(2)+(1)/(2)O_(2)rarrH_(2)O,DeltaH=-y kJ),((III)CH_(4)+2O_(2)rarrCO_(2)+2H_(2)O,DeltaH=-zkJ):}`
Multiply Eq. (II) by 2, ADDING to (I) and then, subtract Eq. (III) from the sum
`C+2H_(2)rarrCH_(4)""DeltaH=(-x-2y+z)kJ`
Discussion
1060.

Tranquilisers are substances used for the treatment of ........

Answer»

cancer
AIDS
MENTAL DISEASES
blood infection

Solution :mental diseases
Discussion
1061.

Which of the following is the reduction half-reaction for a lead storage battery ?

Answer»

`PbO_(2(s))+H_(2)SO_(4)+2H^(+)+2e^(-) to PbSO_(4(s))+2H_(2)O`
`Pb_((s))+H_(2)SO_(4) to PbSO_(4(s))+2H^(+)+2e^(-)`
`Pb_((s))+PbO_(2(s))+H_(2)SO_(4(s)) to 2PbSO_(4(s))+2H_(2)O`
`2PbSO_(4(s))+2H_(2)O to Pb_((s)) +PbO_(2(s))+2H_(2)SO_(4)`

ANSWER :A
Discussion
1062.

underset((X))(H_(2)N)- overset(overset(NH(y))(|))(C )-underset((Z))(NH_(2)) has 3 amino groups x,y and z. Which amino group is more basic?

Answer»

Solution :GROUP is more BASIC. This is because its CONJUGATE acid is more stable due to resonance.

Conjugate ACIDS of the other TWO (x and z)are not stabilised
Discussion
1063.

Which of the following is not a ferromagnetic substance

Answer»

Cobalt
Nickel
Manganese
Iron

Solution :`FE, Co, Ni` are ferromagnetic substance since they show permanent magnetism even in the ABSENCE of magnetic field. Mn is paramagnetic as its magnetism is lost in the absence of magnetic field.
Discussion
1064.

Which of the following reactions occur during the detection of nitrogen in organic substancesby Lassaigne's test

Answer»

`Na + C + N rarr CaCN`
`FeSO_(4)+6NaCNrarrNa_(4)[Fe(CN)_(6)]+Na_(2)SO_(4)`
`3Na_(4)[Fe(CN)_(6)]+2FE(SO_(4))_(3)rarrFe_(4)[Fe(CN)_(6)]_(3) + 6Na_(2)SO_(4)`
None of these

Solution :The various reactions taking placein LASSAIGNE's test fornitrogen are
`Na + C + N rarrNaCN`
`FeSO_(4) +6NaCNrarr N_(4)[Fe(CN)_(6)] +Na_(2)SO_(4)`
`3Na_(4) [Fe(CN)_(6) ] +2Fe_(2) (SO_(4))_(3) rarr underset(" Prussion blue colour") (Fe_(4)[Fe(CN)_(6)]_(3)) +6Na_(2)SO_(4)`
Discussion
1065.

Which statement is not true for astatine:

Answer»

It is less electronegative than iodine
It exhibits only-1 OXIDATION state
Intermolecular forces between the ASTATINE molecules will be larger than between the iodine molecules.
It is COMPOSED of DIATOMIC molecules.

Answer :B
Discussion
1066.

What is the hybridisation state(s) of the atoms in X formed in the following reaction? underset("(Vapours)")(C_(2)H_(5)OH) overset(Al_(2)O_(3))underset(200^(@)C)to X

Answer»

`sp^3` only
`sp^2` and `sp^3`
`sp^2` only
sp only

Answer :A
Discussion
1067.

True statement is

Answer»

pH of normal rain water is 5.6
BOD (Biochemical demand) of clean water is 17 ppm
Excessive nitrate (GT 500 ppm) has LAXATIVE effect
All of these

Solution :`H_(2)O + CO_(2) + H_(2)CO_(3)` (Carbonic ACID).
Discussion
1068.

Which one of the following compounds gives carboxylic acid with HNO_(2) ?

Answer»




SOLUTION :
Discussion
1069.

Which of the following is pseudo alum ?

Answer»

`(NH_(4))_(2)SO_(4).FE(SO_(4))_(3).24H_(2)O`
`K_(2)SO_(4).Al_(2)(SO_(4))_(3).24H_(2)O`
`MnSO_(4).Al_(2)(SO_(4))_(3).24H_(2)O`
None

Solution :The general FORMULA of alum is `overset(+1)(M_(2))SO_(4).overset(+3)(M_(2))(SO_(4))_(3).24H_(2)O`
Discussion
1070.

Which of the following complex species is not expected to exhibit optical isomerism?

Answer»

`[Co(EN)(NH_(3))_(2)Cl_(2)]^(+)`
`[Co(en)_(3)]^(3+)`
`[Co(en)_(2)Cl_(2)]^(+)`
`[Co(NH_(3))_(3)Cl_(3)]`

SOLUTION :`[Co(NH_(3))_(3)Cl_(3)]` SHOWS cis or facial (fac) as well as trans or meridional (mer) isomers. But both these isomers contain plane of symmetry. So they do not exhibit optical isomerism.
Discussion
1071.

Which of the following has maximum reactivity towards HCN ?

Answer»

HCHO
`CH_(3)CHO`
`CH_(3)COCH_(3)`
`CH_(3)COC_(2)H_(5)`

Solution :Positive chargeon CARBONYL CARBON is maximum in case of HCHO. It is because it and therefore, positive charge is not dispersed.
Hence formaldehyde is more reactive than other aldehydes.
Discussion
1072.

What is ZSM-5? What is its formula ?

Answer»

Solution : ZSM-5 is a shape-selective CATALYST. It is a zeolite SIEVE of MOLECULAR porosity-5. Its FORMULA is `H_(x)[(AlO_2)_x( SiO_2)_(96-x)]. 16H_2O`
Discussion
1073.

Which element in first transition series has maximum second ionization enthalpy?

Answer»

CU
Zn
Mn
Fe

Solution :Cu^(+)` has `d^(10)` CONFIGURATION
Discussion
1074.

Which of the following paris of compounds are enantiomers :

Answer»




ANSWER :A
Discussion
1075.

What is 'copper matte'?

Answer»

Solution :Copper matte is OBTAINED when the copper ore is heated in a REVERBERATORY furnace after mixing with silica. Iron oxide froms a SLAG of iron silicate by COMBINING with silica. Copper is produced in the form of copper matte. This contains `Cu_(2)S` and FeS.
Discussion
1076.

Which of the following metal (s) produce(s) N_2O gas on reaction with 20% HNO_3

Answer»

Fe
Sn
Cu
Zn

Answer :AD
Discussion
1077.

What is the alpha - activity in disintigration per minute 1 gm sample of ""^(226)Ra. (t_(1//2) = 1620 " year" )

Answer»

Solution :As the rate of disintegration is to be calculated as disintegrations per minute, `t_((1)/(2))` has also to be taken in MINUTES.
`t_((1)/(2))=1620 XX 365 xx 24 xx 60` minutes
Mole of `""^(226)Ra = (0.001)/(226)`
`therefore` no. of nuclei of `""^(226)Ra`= mole `xx` Av. const
`=(0.001)/(226)xx 6.022 xx 10^(23)`
Now, we have,`-(d(N))/(dt)= lamda (N)= (0.6932)/(t_((1)/(2)))xx N`
`=(0.6932)/(1620 xx 365 xx 24 xx 60) xx (0.001 xx 6.022 xx 10^(23))/(226)`
`=2.16 xx 10^(19)` events/minute
Discussion
1078.

Which of the following is a step-growth polymer?

Answer»

POLYACRYLONITRILE
POLYISOPRENE
Nylon
Polythene

Answer :C
Discussion
1079.

Which of the following is not a favourable condition for physical adsorption?

Answer»

HIGH PRESSURE
NEGATIVE `Delta H`
higher CRITICAL TEMPERATURE of absorbate
high temperature

Answer :D
Discussion
1080.

Which compound is the likely product from reaction of pyrrolidine with excess methyl iodide (equation below)?

Answer»




SOLUTION :`4^(@)` AMMONIUM SALTS
Discussion
1081.

Vacuum distillation is used to refine

Answer»

CU 
SN 
NI 
HG 

ANSWER :D
Discussion
1082.

What is a frequency factor or pre-exponential factor?

Answer»

Solution :In ARRHENIUS equation, `K=Axx e^(-Ea//RT)` the factor A is called frequency factor and since it is a coefficient of exponential expression, `e^(-E_(a)//RT)` it is also called pre-exponential factor.
Inthe above equation k is a rate constant at temperature T, `E_(a)` is the energy of activation and R is a gas constant.
A is related to frequency of COLLISIONS (Z) or rate of collisions. It is represented as, `A=PxxZ` where P is the probability of collisions with PROPER orientations and Z is the frequency of collisions of REACTING molecules .
The units of A are same as that of k.
Discussion
1083.

What must be the pressure of the fluorine gas to produce a reduction material potential of 2.75V in a solution that contains 0.38 M F? E_(F_2,F^-)^@=2.87V

Answer»

SOLUTION :`1.25 TIMES 10^-5 ATM`
Discussion
1084.

Which of the following solid is very hard electrical insulator in solid as well as in a molten state ?

Answer»

Ice
Quartz
Copper
Sodium chloride

Answer :B
Discussion
1085.

Which is water soluble vitamin ?

Answer»

Vitamin-D
Vitamin-E
Vitamin-A
Vitamin-C

Solution :Vitamin-C
Discussion
1086.

Which one of the following is employed as a tranquilizer drug?

Answer»

Promethazine
Valinun
Naproxen
Mifepristone

Answer :B
Discussion
1087.

The standard free energy changes (Delta G^(@)) is related to equilibrium constant K_(p) as

Answer»

`K_(p) = E^(- Delta G^(@)//RT)`
`K_(p) (-Delta G^(@))/(RT)`
`K_(p) = RT LN Delta G^(@)`
`Delta G= e^(K_(P)//RT)`

ANSWER :A
Discussion
1088.

Tripolyphosphate is added to detergents as _______

Answer»


ANSWER :water-softener
Discussion
1089.

When 0.2 mole of anhydrous CuSO_(4)is dissolved in water, the heat evolved is 1.451 kcal. If 0.2moleof CuSO_(4).5H_(2)Ois dissolved in water, the heat absorbed is 0.264 kcal. Calculate the molar heat of hydration of CuSO_(4)

Answer»

11.87 kcal
`-11.87` kcal
17.15 kcal
`-17.15` kcal

Solution :(i) `CuSO_(4)(s)+"aqua"toCuSO_(4)(AQ)`
`DELTA=(-1.451)/0.1=-14.51k "cal MOL"^(-1)`
(ii)`CuSO_(4).5H_(2)O(s)+"aqua"toCuSO_(4)(aq)`
`Deltah=0.264/0.1=2.64 K "cal mol"^(-1)`
From i-ii
`CuSo_(4)(s)+5H_(2)O(l)toCuSO_(4).5H_(2)O(s),`
`DeltaH=-17.15k "cal mol"^(-1)`
Discussion
1090.

What types of ions are present in anhydrous mixture of KF and Hf ?

Answer»

`K^+, H^+, F^-`
(KF)^+ , (HF)^-`
`KH^+, F^-`
`K^+, HF_2^-`

Answer :D
Discussion
1091.

Which of the following process is responsible for the formation of delta at a place where rivers meet the sea ?

Answer»

Emulsification 
COLLOID formation 
Coagulation 
Peptisation 

Solution :The colloidal particles of RIVER GETS settle down at a PLACE where the river meets the sea. The electrolytes PRESENT in the sea coagulate the colloidal particles to form delta.
Discussion
1092.

Write the IUPAC name of the followihng compound : (CH_(3))_(3)C CH_(2)COOH.

Answer»

SOLUTION :3, 3 - Dimethylbutanoic ACID.
Discussion
1093.

Which one of the following polymers is prepared by condensation polymerisation?

Answer»

Teflon
Natural rubber
Styrene
Nylon-6, 6

Solution :Copolymer of ADIPIC acid and HEXAMETHYLENE diamine.
`underset"Adipicacid"(nHOOC(CH_2)_4COOH)+underset"Hexamethylenediamine"(nH_2N(CH_2)_6NH_2)to underset"Nylon 6,6"((--OVERSET(O)overset(||)C-(CH_2)_4-oversetOoverset(||)C-NH-(CH_2)_6-NH--)_n)`
Discussion
1094.

Which of the following is used as a heterogeneous catalyst in the polymerization of ethylene into polyethylene?

Answer»

WALKER's catalyst
Ziegler NATTA catalyst
Wilkinson's catalyst
RUTHENIUM catalyst.

ANSWER :B
Discussion
1095.

Which of the following ions is coloured?

Answer»

`Cu^(+)`
`Cu^(+2)`
`Ti^(+2)`
`V^(+3)`

Solution :`Cu^(+2) , Ti^(+2), V^(+3)` has UNPAIRED ELECTRONS in d-block can exhibit COLOUR
Discussion
1096.

Which of the following Dicarboxylic acid is obtained on oxidation of glucose by strong oxidising agent HNO_(3) ?

Answer»

OXALIC ACID
Malonic acid
Saccharic acid
GLUCONIC acid

SOLUTION :Saccharic acid
Discussion
1097.

Which one has largest number of isomers ?

Answer»

`[Co(en)_(2)Cl_(2)]^(+)`
`[Co(NH_(3))_(5)CL]^(2+)`
`[Ir(PhR_(3))_(2)H(CO)]^(2+)`
`[Ru(NH_(3))_(4)Cl_(2)]^(+)`

SOLUTION :(a) `[M(A A)_(2)Cl_(2)] cis to 2, trans to 1, Total=3`
Discussion
1098.

What conclusion can be obtained on the basis of following electrochemical cell M|M^(+)||X^(-)|X,E_(M^(+)|M)^(o)=0.44V and E_(X|X^(-))^(o)=0.33V.

Answer»

`M^(+)+X^(-) to M+X` is spontaneous REACTION
`M+X to M^(+)+X^(-)` is spontaneous reaction
`E_(cell)=0.11V`
`E_(cell)=-0.11V`.

Solution :`E_(M^(+)|M)^(o)=0.44V`
CATHODE in half-cell: `underset(("Reactant"))(M^(+))+e^(-) to underset(("Product"))(M)`. . . REDUCTION
`therefore E_(M|M^(+))^(o)` (Oxidation POTENTIAL)=-0.44 V
`E_(X|X^(-))^(o)=0.33V`
`X^(-) to X+e^(-)` (Oxidation) and
`M^(+)+e^(-) to M` (Reduction)
`thereforeo X^(-)+M^(+) to X+M` Reaction will occur itself.
Discussion
1099.

Write some uses of sulphur dioxide.

Answer»

Solution :Sulphur DIOXIDE is USED:
as ableaching agent.
as a disinfectant.
as refrigerant.
to REFINE SUGAR
to prepare `H_2SO_4` ETC.
Discussion
1100.

Which isomerism is not possible in ethers ?

Answer»

Tautomerism
Chain isomerism
Metamerism
Position isomerism

Answer :A
Discussion