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.

10851.

Valence bond theory does not give quantitative interpretation of magnetic data.

Answer»


ANSWER :1
Discussion
10852.

Which of the following contains nitrogen?

Answer»

PROTEINS
Fats
OILS
Carbohydrates

Solution :Proteins contain nitrogen. Nitrogen is present.in amino ACID which is a major CONSTITUENT of protein.
Discussion
10853.

Whatdoyou meanbybenefactionprocess ?

Answer»

SOLUTION :The process used toconcentratean ore iscalledthebenefactionprocess. FOREXAMPLE, FROTHFLOATATION,electromagneticseparation, leaching, ETC.
Discussion
10854.

Which statement is NOT correct?

Answer»

Potassium PERMANGANATE is a powerful oxidising SUBSTANCE.
Potassium permanganate is a weaker oxidising substance than potassium dichromate.
Potassium permanganate is a STRONGER oxidising substance than potassium dichromate.
Potassium dichromate OXIDISES a secondary ALCOHOL into a ketone.

Answer :B
Discussion
10855.

What is the characteristic valence shell configuration of coinage metals ?

Answer»

`ns^2np^6`
`(n-1)d^2np^6`
`nd^9ns^1`
`(n-1)d^10ns^1`

ANSWER :D
Discussion
10856.

Which of the following reagents can convert

Answer»

`RMgX//H_(2)O`
`(CH_(2)OH)_(2)`
ROR'
`RH//H_(2)O`.

Solution :This is a cyclic ketal RESULTING from the reaction of ethylene glycol on DIETHYL ketone.
Discussion
10857.

Write the IUPAC names of the following (i)[Co(NH_(3))_(6)Cl_(3) (ii)[Co(NH_(3))_(5)Cl]Cl_(2) (iii) K_(3)[Fe(CN)_(6)] (iv)K_(3)[Fe(C_(2)O_(4))_(3)] (v) K_(2)[PdCl_(4)] (vi) [Pt(NH_(3))_(2)Cl(NH_(2)CH_(3))]Cl

Answer»

SOLUTION :`(i)` Hexaamine cobalt (III) chloride
`(ii)` Pentaamine chloridocobalt (III) chloride
`(iii)` Potassium HEXACYANOFERRATE (III)
`(iv)` Potassium trioxalatoferrate (III)
`(v)` Potassium tetrachlorido palladate (II)
`(vi)` Diamminechlorido (METHYLAMINE) PLATINUM (II) chloride
Discussion
10858.

What type of defect can arise when a solid is heated? Which physical property is affected by it and in what way?

Answer»

SOLUTION :On heating, some atoms or ions leave the lattice sites and vacance DEFECT is produced. It RESULTS in DECREASE in the density of the substance.
Discussion
10859.

Which shows weak ionisation in water

Answer»

`H_(2)SO_(4)`
NACL
`HNO_(3)`
`NH_(3)`

SOLUTION :Because it is a weak electrolyte.
Discussion
10860.

Which one is most reactive towards electrophilic reagent ?

Answer»




SOLUTION :is most reactive DUE to the presence of electron RELEASING GROUP.
Discussion
10861.

Which of the following curve will represent the variation of conductance C during titration of CH_(3)COOH by gradual addition of NaOH solution (V)

Answer»




ANSWER :D
Discussion
10862.

Which one of the following esters cannot undergo Claisen self-condensation ?

Answer»

`CH_3 CH_2CH_2 CH_2 COOC_2H_5`
`C_6H_5COOC_2H_5`
`C_6H_5CH_2 COOC_2H_5`
`C_6H_11CH_2 COOC_2H_5`

ANSWER :B
Discussion
10863.

Vapour pressure of pure A = 100 torr, moles = 2. Vapour pressure of pure B = 80 torr, moles = 3. Total vapour pressure of mixture is

Answer»

440 torr
460 torr
180 torr
88 torr

Solution :`P_("total")=p_(A)^(@)x_(A)+p_(B)^(@)x_(B)`
`P_("total")=P_(A)+P_(B)=100xx(2)/(5)+80xx(3)/(5)=88` torr.
Discussion
10864.

Which of the following compounds is formed when acetophenone is treated with bromine in acidic medium ?

Answer»

WIDTH="30%">

`##CHY_CHE_ORG_XII_P2_PYQ_17_E01_061_O03.png" width="30%">
`##CHY_CHE_ORG_XII_P2_PYQ_17_E01_061_O04.png" width="30%">

ANSWER :C
Discussion
10865.

Total number of Bravais lattices is

Answer»

3
7
10
14

Answer :D
Discussion
10866.

When ethanol on dehydration with conc. H_(2)SO_(4) at 443 K gives ethane. What will be obtained if the temperature is raised to 413 K ?

Answer»

SOLUTION :ETHOXYETHANE
Discussion
10867.

What is lucas reagent? How does it help in distinguishing primary, secondary and tertiary alcohols?

Answer»

Solution :Lucas reagent is a mixture of conc. HCl and ANHYDROUS `ZnCl_(2)`. The product is alkyl chloride ACCOMPANIED by white turbidity and cloudiness.
`-underset(1^(@), 2^(@)"or"3^(@))underset(("Alcohol")) underset(|)overset(|)(C)-OH+H-Cloverset(ZnCl_(2))(to)-underset(("Alkyhchloride"))underset(|)overset(|)(C)-Cl+H_(2)O`
(i) It turbidiy appears immediately, alcohol is tertiary `(3^(@))`
(ii) It turbidity appears after sometime, alcohol is secondary `(2^(@))`
(iii) In case turbidity appears on heating, alcohol is primary `(1^(@))`
Discussion
10868.

What is battery?

Answer»

SOLUTION :BATTERY is a COMBINATION of GALVANIC cells in series where the chemical energy of redox reaction is converted to ELECTRICAL energy. Batteries are used as a source of electrical energy.
Discussion
10869.

Water gas is

Answer»

`CO+CO_2`
`CO+N_2`
`CO+H_2`
`CO+N_2+H_2`

ANSWER :D
Discussion
10870.

Which one of the following species is diamagnetic in nature ?

Answer»

`He_(2)^(+)`
`H_(2)`
`H_(2)^(+)`
`H_(2)^(-)`

SOLUTION :`H_(2):(sigma_(1S))^(2)` is DIAMAGNETIC.
Discussion
10871.

What are biodegradable and non-biodegradable detergents? Give one example of each.

Answer»

SOLUTION :Biodegradable detergents are DECOMPOSED by micro-organisms present in sowage.
Non-biodegradable detergents which have branches CHAIN alkyl groups are not decomposed by micro-organisms and create WATER POLLUTION.
Discussion
10872.

Vapour pressure of solution decreases with ____ in temperature.

Answer»

SOLUTION :INCREASES
Discussion
10873.

Which of the following compounds cannot be used as solvent in Friedel-Crafts reaction ?

Answer»

Nitrobenzene
o - dinitrobenzene
Cyanobenzene
Toluene

Solution :`-NO_(2)` GROUP RING de-activating
Discussion
10874.

Which of the following compounds is colourless?

Answer»

`Fe^(3+)`
`TI^(4+)`
`CO^(2+)`
`Ni^(2+)`

Solution :`Ti^(4+)` contains no UNPAIRED electrons in d orbital, hence no d-d TRANSITION.
Discussion
10875.

Which acid of each pair shown here would you expect to be stronger ? .

Answer»

SOLUTION :.
Discussion
10876.

Which of the following statement (s) is (are) correct

Answer»

The pH of `1.0 xx 10^(-8) M` solution of HCl is 8
The conjugate base of `H_(2)PO_(4)^(-)` is `HPO_(4)^(2-)`
Autoprotolysisconstant of WATER increases with temperature
When a solution of a weak monoprotic ACID is titrated against a strong base, at half-neutralisation POINT `pH = (1//2) pK_(a)`

Solution :pH of `1 xx 10^(-8) M` is below to 7
`H_(2)PO_(4)^(-) + H_(2)O hArr HPO_(4)^(2-) + H_(3)O^(+)`
`H_(2)O + H_(2)O hArr OH^(-) + H_(3)O^(+)`
K (Auto protolysis constant of water i.e., ionic product of water) increases with temperature.
For half neutralisation of a weak acid by a weak base,
`pH = pK_(a) + log.(["Salt"])/(["Acid"])`
[Salt] = [Acid], `:. pH = pK_(a)`.
Discussion
10877.

Two gaseous equlibriua SO_(2(g))+1/2O_(2(g))hArrSO_(3(g))and 2SO_(3(g))hArr2SO_(2(g))+O_(2(g)) have equlibrium constants K_(1) and K_(2) respectively at 298K. Which of the following relationship between K_(1)and K_(2) is correct

Answer»

`K_(1)=K_(2)`
`K_(2)=K_(1)^(2)`
`K_(2)=(1)/(K_(1)^(2))`
`K_(2)=(1)/(K_(1))`

SOLUTION :`K_(1)=([SO_(3)])/([SO_(2)][O_(2)]^(1//2))and K_(2)=([SO_(2)]^(2)[O_(2)])/([SO_(3)]^(2)),K_(2)=(1)/(K_(1)^(2)).`
Discussion
10878.

Which of the following are addition polymers ?

Answer»

Nylon
Melamine FORMALDEHYDE resin
Orlon
Polystyrene

Answer :A::C::D
Discussion
10879.

Which one is the complementary base in RNA strand to the adenine base in DNA during protein synthesis:

Answer»

Adenine
Guanine
Uracil
Cytosine

Answer :D
Discussion
10880.

Which of the following countries had an issue related to the migration of Rohingyas?

Answer»

NEPAL
BHUTAN
Myanmar
China

Answer :C
Discussion
10881.

What is complex salt ?

Answer»

Solution :These SALTS RETAIN their IDENTITY in solution in water or in any other solvents. It EXISTS in SOLID as well as in solution form.
Discussion
10882.

What is the action of concentrated sulphuric acid on aniline?

Answer»

Solution :ANILINE on treatment with cold sulphuric ACID FORMS anilinium hydrogen sulphate which on HEATING with sulphuric acid at 453-473 k GIVES p-aminobenzene sulphonic acid (sulphanilic acid) as major product.
Discussion
10883.

Which of the following haloalkanes reacts with aqueous KOH most easily ? Explain giving reason. (i) 1-Bromobutane (ii) 2-Bromobutane (iii) 2-Bromo-2-methylpropane (iv) 2-Chlorobutane.

Answer»

SOLUTION :2-Bromo-2-methylpropane (iii) is a `3^(@)` alkyl BROMIDE. It readily undergoes IONIZATION to form a STABLE `3^(@)` carbocation. Therefore, it reacts with aq. KOH most readily.
Discussion
10884.

There is sudden change is the slopes for some metal oxides like MgO, ZnO , HgO in Ellingham diagram . It is the indication of

Answer»

INSUFFICIENT supply of oygen
excess of oxygen
phase change
completion of reaction

Solution :That is the MP or BP of METAL
Discussion
10885.

Which of the followingis not correct

Answer»

A SIGMA BOND is weaker than `pi` bond
A sigma bond is stronger than `pi` bond
A DOUBLE bond is stronger than a SINGLE bond
A double bond is shorter than a single bond

ANSWER :A
Discussion
10886.

What are reducing and non-reducing sugars ?

Answer»

SOLUTION :
Discussion
10887.

Which of the following chlorofuorocarbon is hyghly toxic ?

Answer»

`C ClF_(2)`
`CHClF_(3)`
`CHCl_(2)F_(2)`
`C_(3)H_(2)Cl_(3)F_(3)`

ANSWER :D
Discussion
10888.

Which of the following is the formula of argol?

Answer»

`{:(,,CH(OH)COOH),(,,"|"),(,,CH(OH)COOK):}`
`{:(,CH(OH)COOK),(,"|"),(,CH(OH)COO(SbO)):}`
`{:(,CH(OH)COOK),(,"|"),(,CH(OH)COOK):}`
`{:(,CH(OH)COOK),(," |"),(,CH(OH)COONA):}`

Solution :TARTAREMETIC (i.e., potassium antiomony (+) TARTRATE) i.e., `{:(,CH(OH)COOK),(,"|"),(,CH(OH)COO(SbO)):}` is used as an emetic, i.e., to cause housed and VOMITING during treatment of poisoning.
Discussion
10889.

Which colour well be observed when Manganese dioxide is fused with KOH in presence of O_(2)?

Answer»

Purple
Green
Orange
Red

Solution :`K_(2)MnO_(4)` is FORMED
Discussion
10890.

Which of the followingppt , is soluble dil , HNO_(3)and NH_(3) solution ?

Answer»

`Ag_(2)S_(2)O_(3)`
`Ag_(2)CO_(3)`
`Ag_(2)SO_(3)`
`AGI`

ANSWER :a,b,C
Discussion
10891.

The units of Normality are

Answer»

MOLE. `LIT^(-1)`
mole. `Kg^(-1)`
equivalent. `"lit"^(-1)`
equivalent. `Kg^(-1)`

Answer :C
Discussion
10892.

What happens when methyl magnesium bromide reacts with ethyl methanoate followed by acid hydrolysis?

Answer»

SOLUTION :
Discussion
10893.

Which one of the following methods is neither meant for the synthesis nor for separation of amines?

Answer»

Hinsberg reagent
Hofmann's method
Wurtz reaction
Curtius reaction

Answer :C
Discussion
10894.

Which of the following has higher IP ?

Answer»

OXYGEN
SULPHUR
SELENIUM
TELLURIUM

ANSWER :A
Discussion
10895.

The standard Gibbs energy change at 300K for the reaction 2A⇋B+C is 2494.2 J. At a given time, the composition of the reaction mixture is [A] =21​ , [B] = 2 and [C] =21​ . The reaction proceeds in the : [R=8.314J/K/mol,e=2.718]

Answer»

FORWARD direction because Q>K_c`
reverse direction because Q>`K_c`
forward direction because Qreverse direction because Q

Solution :`2A0=294.2J`
R`=8.314.K^(-1).mol^(-1)" "/_\G^(0)=2.303RTlogK_c`
or `294.2=-2.303xx8.314xx300xxlogK_c`
or `K_c`=ANTILOG`(-04342)" or "K_c=0.3679`
`Q=([B][C])/([A]^2)=(2xx1/2)/((1/2)^2)=4`
Here, `Q>K_c`. Thus, the reaction will PROCEED in the backward direction.
Discussion
10896.

Which one of the following pairs will gives effervescence with aq. NaHCO_(3)? underset((I))(CH_(3)COCl)""underset((II))(CH_(3)COCH_(3)) underset((III))(CH_(3)COOCH_(3))""underset((IV))(CH_(3)COOCOCH_(3))

Answer»

I & II
I & IV
II & III
I & III

Solution :Acid chloride and acid anhydride are extremely REACTIVE out of acid derivatives. They react independently with water even in the absence of CATALYST to give carboxylic acid, which will ultimately reacts with `NaHCO_(3)` to give sodium salt of acid and `CO_(2)`. Ester reacts with water in presence of acid catalyst to produce acid. Acetone is inert toward `NaHCO_(3)` solution.
Discussion
10897.

Which of the following is liberated when cold HCl is treated with KMNO_4?

Answer»

`H_(2)`
`Cl_(2)`
`H_(2)O`
`O_(2)`

ANSWER :B
Discussion
10898.

The various of equivalent conductance of strong electrolyte with sqrt("concentration") is shown in figures below. Which one is correct?

Answer»




ANSWER :B
Discussion
10899.

Which of the following chemical is responsible to produce more foam in shaving soap ?

Answer»

SODIUM tartarate
Sodium acetate
Sodium benzoate
Sodium rosinate 

ANSWER :D
Discussion
10900.

Which of the following lanthanoid ions is diamagnetic ? (At nos Ce = 58, Sm, =62, Eu =63, Yb = 70)

Answer»

`Sm^(2+)`
`Eu^(2+)`
`YB^(+)`
`Ce^(2+)`

Solution :`Sm^(2+)(Z=62)`
`[XE]4f^6 - 6 " unpaired " e^- "" Eu^(2+)(Z=63)`
`[Xe]4f^(7)6S^2 -7 " unpaired "e^- ""Yb^(2+)(Z=70)`
`[Xe]4f^(14)6s^(2)-0 " unpaired " e^- "" Ce^(2+)(Z=58)`
`[Xe]4f^1 5d^1 6s^2 -2` unpaired `e^-`only `Yb^(2+)` is diamagnetic .
Discussion