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.

21851.

Which of the following is FALSE about Gutta-Percha?

Answer»

It is a trans-1,4-polyisoprene polymer.
 It is ELASTIC in nature.
It has ZIGZAG chains fitting in ONE another.
 It shows GEOMETRICAL isomerism with NATURAL rubber.

Answer :B
Discussion
21852.

Which of the following names of the organic compounds is not correctly written ?

Answer»




`CH_(2)=CH-OVERSET(O)overset("||")C-CH=CH_(2)` -Penta - 1, 4 - dien - 3 - one

SOLUTION :
Discussion
21853.

When iron or zinc is added to CuSO_(4) solution, copper is precipitated. It is due to

Answer»

Oxidation of `Cu^(+2)`
Reduction of `Cu^(+2)`
Hydrolysis of `CuSO_(4)`
Ionization of `CuSO_(4)`

Solution :
In this reaction `Cu^(2+)` change in `Cu^(0)`, hence it is CALLED as reduction reaction.
Discussion
21854.

underset(("Purple"))(A)rarrunderset(("Green"))(B)+underset(("Black"))(C)+underset(("Gas"))(D) B cannot be converted to A by

Answer»

`KOH`
`CO_(2)` is FORMED
`Cl_(2)`
`O_(2)`

Solution :KOH cannot oxidise `B RARR A`
Discussion
21855.

The voltage of Pb-accumulator cell depends on

Answer»

size of cell
size of cell and concentration of `H_(2)SO_(4)`
only on concentration of `H_(2)SO_(4)`
size of cell or concentration of `H_(2)SO_(4)`

SOLUTION :Voltage decreases with DECREASE in specific gravity of `H_(2)So_(4)`.
Discussion
21856.

the wave nature of electron was experimentally verified by

Answer»

`de-Broglie`
DAVISSON and Germer
Einstein
Schrodinger

Answer :B
Discussion
21857.

Which of the following is a step growth polymer?

Answer»

Nylon
Polyisoprene
Polythene
Polyacrylonitrile.

Answer :A
Discussion
21858.

Various phenol derivatives, tincture of iodine (2-3% I_2 in water / alcohol) and some dyes like methylene blue are :

Answer»

Antiseptics
Disinfectants
Analgesics
Antipyretics

Answer :A
Discussion
21859.

Which of the following have high melting points:

Answer»

ACIDS containing even NUMBER of carbon ATOMS
Acids containing odd number of carbon atoms
Both (a) and (B)
None

Answer :A
Discussion
21860.

Which cell will measure standard electrode potential of copper electrode ?

Answer»

`Pt_((S))|H_(2(g,0.1" bar"))|H_((aq,1M))^(+)||Cu_((aq,1M))^(2+)|Cu`
`Pt_((S))|H_(2(g,1" bar"))|H_((aq,1M))^(+)||Cu_((aq,2M))^(2+)|Cu`
`Pt_((S))|H_(2(g,1" bar"))|H_((aq,0.1M))^(+)||Cu_((aq,1M))^(2+)|Cu`
`Pt_((S))|H_(2(g,1" bar"))|H_((aq,1M))^(+)||Cu_((aq,1M))^(2+)|Cu`

Solution :`underset("Standard Hydrogen electrode, "H_(2)" gas and standard PRESSURE is 1 bar".)ubrace(Pt_((S))|H_(2(g,"1 bar"))|H_((aq,1M))^(+))||underset("Standard copper electrode. "Cu_((aq))^(2+)=1M)ubrace(Cu_((aq,1M))^(2+)|Cu)`
* To MEASURE the electrode potential of any electrode, the concentration in HALF cell must be 1 M and pressure of gas should be 1 bar.
Discussion
21861.

Which of the following alkenes is leastreactive towards anionicpolymerisation ?

Answer»

a. `CH_(2)=CHCH_(3) `
b. `CH_(2)=CF_(2)`
c.`CH_(2)=CHCN`
d. `CH_(2)=CHC_(6)H_(5)`

Solution :In anionic polymerisation , ( on reaction with `KNH_(2)`) carbanions are the intermediates. GREATER the STABILITY of the carbanion, more reactive is the alkene. Since the stability of the carbonions decreases in the order : `H_(2)N-CH_(2)-overset(-)CHCN gt H_(2)NCH_(2)overset(-)CF_(2) gt H_(2)NCH_(2)overset(-)CHC_(6)H_(5) gt H_(2)NCH_(2)overset(-)CHCH_(3)`, therefore , the REACTIVITY decreases in the same order . Thus `CH_(2)=CHCH_(3)` is least reactive.
Discussion
21862.

When ethanal is heated with Fehling's solution, it givesa precipitate of :

Answer»

CU
CUO
`Cu_2O`
`Cu + Cu_2O + CuO`

ANSWER :C
Discussion
21863.

What are antacids?

Answer»

Solution :The CHEMICAL substances which neutralize EXCESS acid released by gastric JUICES and give relief from acid indigestion, heart burns and gastriculars are called antacids. e.g., MAGNESIUM hydroxide, magnesium carbonate and magnesium trisilicate.
Discussion
21864.

The smallest atom in the following is :

Answer»

Fluorine
Chlorine
Iodine
Bromine

Answer :A
Discussion
21865.

Which of the following will form acetyle chloride with PCl_(5) ?

Answer»

MeCOOH
MeCOOMe
MeCOOCOMe
`Me-CONH_(2)`

ANSWER :A::B::C
Discussion
21866.

Which of the following gases is adsorbed easily and more on activated charcoal

Answer»

`CO_(2)(T_( c) = 304K)`
`SO_(2)(T_( c) = 430K)`
`H_(2)(T_( c) = 23K)`
All GASES adsorp to the extent

Answer :B
Discussion
21867.

Which of the following conditions represents an equilibrium?

Answer»

Freezing of ice in an open VESSEL, temperature of ice is constant
Few DROPS of water are present along with AIR in a balloon, temperature of balloon is constant
Water is boiling in an open vessel over STOVE, temperature of water is kept constant
All the statements (1), (2) and (3) are CORRECT for the equilibrium

Answer :D
Discussion
21868.

Which reaction is used to prepare Toluene from chlorobenzene ?

Answer»

WURTZ REACTION
Wurtz - FITTING reaction
Fitting reaction
Friedel-Crafts ALKYLATION

SOLUTION :
Discussion
21869.

Which of the following halides cannot be hydrolysed?

Answer»

`TeF_(6)`
`SF_(6)`
`PCl_(5)`
`PCl_(3)`

Solution :`SF_(6)` cannot be HYDROLYSED due to STERIC hindrence of fluoride.
Discussion
21870.

X overset(Sn, HCl)rarr Y overset(KNO_(2), HCl)rarr Z. The compound 'Z' reacts with 'Y' at pH value 6 to give an yellow coloured dye. What is 'X'?

Answer»

SOLUTION :NITROBENZENE
Discussion
21871.

Which of the following has minimum golt number ?

Answer»

Polato STARCH
Gum arabic
GELATINE
Albumen

Solution :Gelatine has MINIMUM gold number and hence HIGHEST protective POWER.
Discussion
21872.

Which of the followin compounds will give a yellow precipitate with iodine and alkali?

Answer»

Acetophenoone
Methyl acetate
Acetamide
2-Hydroxypropane

Solution :Compounds which CONTAIN `CH_(3)CO-` or `CH_(3)CHOH-` group attached to C or H on treatment with `I_(2)` and ALKALI give yellow PPT. of iodoform.

THUS, acetophenone and 2-hydroxypropane give iodoform but acetamide ad methyl acetate which although contain the `CH_(3)CO-` group but that is not attached to C or H and hence do not give iodoform.
Discussion
21873.

Which contains both Ca and Mg ?

Answer»

Limestone
Dolomite
Chalk
Felspar

Answer :B
Discussion
21874.

The substance added to Nacl in Down's process to lower the melting point of NaCl

Answer»

KCL
`K_(2)CO_(3)`
`CaCl_(2)`
`AlCl_(3)`

ANSWER :C
Discussion
21875.

Which among the following has highest electrical conductivty ?

Answer»

Zn
Fe
Ag
Cu

ANSWER :C
Discussion
21876.

Write with equation what happens when propene and HBr react ?

Answer»

SOLUTION :According to markownikoff.s RULE propane REACTS with HBR to form 2 -Bromopropane.
Discussion
21877.

Which of the following statement(s) is/are incorrect? (i).Higher boranes are not flammable. (ii). Boranes are hydrolysed by water to give orhtoboric acid. (ii). Boranes undergoes cleavage reactions with Lewis bases to give borane adducts.

Answer»

(i) only
(ii) and (iii)
(iii) only
(i) and (ii)

Solution :Higher BORANES are also SPONTANEOUSLY flammable in AIR
Discussion
21878.

What is the basicity of H_3PO_4 ?

Answer»

SOLUTION :BASICITY of `H_3PO_4` is 3 because it contains 3 ionisable HYDROGEN ATOMS.
Discussion
21879.

The statement that is not correct for the periodic classification of element is

Answer»

the properties of the elements are the periodic function of their atomic numbers
non-metallic elements are lesser in number than metallic elements
the first IONIZATION ENERGIES of elements along a period do not vary in a regular manner with increase in atomic number
for transition elements the d-sub-shells are filled with elements monotonically with increase in atomic numbers.

Solution :For transition elements, d-sub shells are not filled with electrons monotonically (one at a time) because of extra stability of `d^5` and `d^(10)` configurations. Besides these, there are MANY other exceptions, e.g. Nb, Mo, RU, RH, Pd etc.
Discussion
21880.

When ethyl hydrogen sulphate is heated with excess alcohol at 410 K, the product obtained is

Answer»

Ethane
Ethylene
DIETHYL ETHER
Diethyl sulphate

Answer :C
Discussion
21881.

The value of electro chemical equivalent is equal to …………. .

Answer»

`96500/("EQUIVALENT MASS")`
`96500/("MOLAR mass")`
`("Molar mass")/96500`
`("Equivalent mass")/(96500)`

ANSWER :D
Discussion
21882.

What is metallurgy?

Answer»

Solution :Metallurgy : The PROCESS of EXTRACTION of metal in a PURE state from its ORE is CALLED metallurgy.
Discussion
21883.

Which of the following are not correct statement for CsBr_(3).

Answer»

It is a covalent COMPOUND
It CONTAIN `Cs^(3+)` and `Br^(-)` ions
It contains `Cs^(+)` and `Br_(3)^(-)` ions
It contains `Cs^(+),I^(-)` and lattice `I_(2)` molecule.

SOLUTION :(abd)(a),(b) and (d) are correct answer because they are not correct STATEMENT (c) is correct statement because it contains `Cs^(+)` and `Br^(3-)` ions.
Discussion
21884.

The value of molar conductivity of HCl is greater than that of NaCl at a particular temperaturebecause

Answer»

Molecular mass of HCL is greater than that of NaCl
Mobility of `H^(+)` ions is more than that of `Na^(+)` ions
HCl is strongly acidic
IONISATION of HCl is LARGER than that of NaCl

Answer :B
Discussion
21885.

Which of the following equations depicts reducingnature of H_2O_2?

Answer»

`2[Fe(CN)_6]^(4-) + 2H^(+) + H_2O_2 to 2[Fe(CN)_6]^(3-) + 2H_2O`
`I_2+H_2O_2 + 2OH^(-) to 2I^(-)+ 2H_2O + O_2`
`MN^(2+) + H_2O_2to Mn^(4+) + 2OH^(-)`
`PBS+ 4H_2O_2 to PbSO_4 + 4H_2O`

SOLUTION :`I_2+H_2O_2 + 2OH^(-) to 2I^(-) + 2H_2O + O_2`
`I_2` is reduced to `I^-` . Thus , `H_2O_2` acts as a REDUCING agent.
Discussion
21886.

When but -3-en-2-ol reacts with aq HBr , we get

Answer»

3-bromobut-1-ene
1-bromobut-2-ene
A MIXTURE of both (a) and (B)
2-bromobut-2-ene

Solution :
Discussion
21887.

The stability of the alkali metal chlorides listed below follows the order :

Answer»

`LiClgtKClgtNaClgtCsCl`
CsgtKClgtNaClgtLiCl
NaClgtKClgtLiClgtCsCl
KClgtCsClgtNaClgtLiCl

Answer :D
Discussion
21888.

Varous phenol derivatives, tincture of iodine (2-3% 1_(2) in water//alcohol) and some dyes like methlylene blue are

Answer»

antiseptics
disinfectants
analgesics
antipyretics.

Solution :Antiseptic drugs CAUSE destruction of microorganisms that produce septic diseases, e.g., dettol, savlon, acriflavin, BORIC acid, phenol, iodoform, `KMnO_(4)` and some dyes such as CHLORAMINE - T, METHYLENE blue, gentian violet.
Discussion
21889.

Vander Waal's constant 'b' of a gas is 125.57 centilite/mol. The nearest distance between the centes of the two molecules is "x" xx 10^(-7)cm

Answer»

SOLUTION :1 `1.6xx10^(-7) cm`
`b=N_(A)xx4xx4//3pi r^(3)` `125.57xx10^(-2)xx1000=6.023xx10^(23)xx4xx4//3xx3.14^(3)`
`r^(3) =(125.57xx10xx3)/(6.023xx10^(23)xx4xx4xx3.14)`
`r=5xx10^(-8) cm`
So collision diameter (nearest possible DISTANCE) `=1.0xx10^(-7) cm`
x=1
Discussion
21890.

which alkene will not show geometrical isomerism ?

Answer»

`XYC = CXY`
`XYC = CXZ`
`XYC = CZW`
`XYC = CXX`

ANSWER :D
Discussion
21891.

Which of the following will give a product with less number of carbon than reactant?

Answer»




All of these

Answer :D
Discussion
21892.

which component of the typical birth control pill is responsible for regulating the menstrual cycle:

Answer»

Androgen
Estrogen
Progestin
Oxytocin

Answer :C
Discussion
21893.

Which one of the following aldehydes will not form and aldol when treated with dilute NaOH

Answer»

`C_(6)H_(5)CH_(2)CHO`
`CH_(3)CH_(2)CHO`
`(CH_(3))_(3)C CHO`
`CH_(3)CHO`

Answer :C
Discussion
21894.

Which one is cleansing agents ?

Answer»

Soap
DETERGENTS
(A) and (B) both 
Biohard detergents 

SOLUTION :(A) and (B) both
Discussion
21895.

Write teh IUPAC name of the following : CH_(3)-underset(C_(2)H_(5))underset("|")overset(CH_(3))overset("|")"C "-underset(OH)underset("|")"CH"-CH_(3)

Answer»

Solution :The structure of the COMPOUND can be written as :
`UNDERSET("3, 3 - Dimethylpentan -2-ol")(overset(5)CH_(3)-overset(4)CH_(2)-overset(CH_(3))overset("3|")underset(CH_(3))underset("|")"C "-overset("2")underset(OH)underset("|")"CH"-overset(1)CH_(3))`
Discussion
21896.

Tyndall effect is observed during the projection in a cinema theatre. Why?

Answer»

Solution :During the PROJECTION of picture, light travels from projector to the screen. This light is scattered by the dust and smoke PARTICLES . Hence Tyndall EFFECT is OBSERVED.
Discussion
21897.

Which of the following pairs of a chemical reaction is certain to result in a spontaneous reaction ?

Answer»

Exothermic and increasing DISORDER
Exothermic and DECREASING disorder
Endothermic and increasing disorder
Endothermic and decreasing disorder

Solution :Disorder INCREASES in exothermic SPONTANEOUS process.
Discussion
21898.

Which of the following is the correct prediction about observed B - F bond length in BF_3 molecule ?

Answer»

B - F bond length in `BF_3` is FOUND to be less than theoretical value because the electronegativity values of B (2.04) and F (4.0) SUGGEST the bond length to be ionic and hence , the attraction between oppositely CHARGED ions must decrease the bond length.
`BF_3 and [BF_4]^(-)` have equal B - F bond length .
The decrease in the B - F bond length in `BF_3` is due to delocalised `ppi - ppi` bonding between vacant 2p ORBITAL of B and filled 2p orbital of F
The correct B - X bond length order is `B - F gtBClgtB-BrgtB-I`

ANSWER :C
Discussion
21899.

Why aromatic primary amines cannot be prepared by Gabrial synthesis.

Answer»

Solution :Because ARYLHALIDES cannot UNDERGO NUCLEOPHILIC SUBSTITUTION reaction with ino FORMED by phthalamide.
Discussion
21900.

Which compound has hydrogen bonding

Answer»

Toluene
Phenol
Chlorobenzene
Nitrobenzene

Solution :
Discussion