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.

151.

When acetic acid and ethanol are mixed in equimolar proportions, equilibrium is attained when 2/3rd of the acid and alcohol are consumed. The value of K_c is:

Answer»

0.4
4
40
4.0xx`10^2`

ANSWER :B
Discussion
152.

Why artificial rain can be caused by throwing common slat on the clouds ?

Answer»

SOLUTION :CLOUDS are colloidal DISPERSION of water particles in air. The collodial water particles carry charge. On throwing COMMON SALT on the clouds, coagulation of water particles takes place as common salt is an electrolyte.
Discussion
153.

Whichoneof the following is foundin cytoplasmand in ribosomers whichcontain 60% RNA and 40% protein.

Answer»

Riosomal RNA
MessengerRNA
Transfer RNA
DNA

Answer :A
Discussion
154.

What is the effect of temperature on the rate constant of a reaction ? How can this temperature effect on rate constant be represented quantitatively ?

Answer»

SOLUTION :(i) The rate constant is nearly doubled with a rise temperature by `10^(@)C` for a chemical reaction.
(II) The temperatureeffect on the rate constant can be represented quantitatively by Arrhenius EQUATION.
`k = Ae^((-E_(a))/(RT))`
Discussion
155.

Which one of the following is a mineral of iroes'

Answer»

Malachite
Cassiterite
Pyrolusite
Magnetite

Solution :[`Fe_(3)O_(4)RARR` Magenetite]
Discussion
156.

Which type of Buna-S is used in preparation of tyres and shoes sole ?

Answer»

SOLUTION
ELASTOMER
(A) and (B) both
NONE of these

Solution :Solution
Discussion
157.

Which of the following is true for the given reaction ?

Answer»

The reactant (A) and PRODUCT (B) are diasteromers of each other.
The reactant (A) and product (B) are ENANTIOMERS of each other and both are optically active.
Under the same reaction conditions the diastereomers of (A) will produce the diastereomer of (B).
The reactants (A) and product (B) have the same optical ROTATION but in OPPOSITE direction.

Answer :C
Discussion
158.

Write the structure of the aldehyde, carboxylic acid and ester that yield 4- methylpent -2-en-1-ol

Answer»

SOLUTION :(i) Aldehyde yield 4-methylpent-2-en-1-ol is,
`CH_3- UNDERSET(CH_3)underset(|)(CH) - CH = CH - CHO`
(ii) ACID yicld 4-methylpent-2-en-1-ol is,
`CH_3 - underset(CH_3)underset(|)(CH) - CH = CH - COOH`
(iii) ESTER yield 4-methylpent-2-en-1-ol is,
`CH_3 - underset(CH_3)underset(|)(CH) -CH = CH- COOC_2 H_5`
The above shown compounds undergo REDUCTION reaction to yield 4 - methylpent - 2- en - 1 - ol.
`CH_3 -underset(CH_3)underset(|)(CH) - CH = CH - CH_2 - OH`
Discussion
159.

The relation between rate constant and temperature of a reaction was given by

Answer»

ARRHENIUS
CHARLES
BOYLE
Avogadro

Answer :A
Discussion
160.

Volume of a solution change with change in temperature, then, will the molality of the solution be affected by temperature ? Given reason for your answer.

Answer»

Solution :No, molality does not CHANGE with TEMPERATURE because it involves masses of the SOLUTE and solvent which do not change with temperature.
Discussion
161.

Zinc reacts with very dilute nitric acid to produce:

Answer»

NO
`NH_4NO_3`
`NO_2`
`H_2`

ANSWER :B
Discussion
162.

When an alkali metal fluoride are dissolved in XeF_4, the anion X is formed. The shape of anion X is ............

Answer»

Octahedral
Square antiprismatic
Pentagonal monopyramidal
Distorted octahedral

Solution :`CSF + XeF_(4) to CS^(+) [XeF_(5)]^(-)`
Discussion
163.

The vapoure pressure of most substances increases with temperature as depicted by this curve. Which way of plotting these data is expected to give a straight line ?

Answer»

<P>1/P VERSUS T
P versus 1/T
In P vesus
In P vesus 1/T

Answer :D
Discussion
164.

Which of the following sulphide is not soluble in dil. HNO_3 ?

Answer»

`HGS `
`CUS `
`Bi_2S_3`
`CDS` .

ANSWER :A
Discussion
165.

Which of the following curve does not represent Boyle's law?

Answer»




ANSWER :D
Discussion
166.

Which alkali metal can be preferably used in photoelectric cells ?

Answer»

Li
Na
Rb
Cs

Solution :Because it has LOWEST IONIZATION ENTHALPY.
Discussion
167.

Which of the following is used to cure cold and cough?

Answer»

METHYL SALICYLATE
Ethyl salicylate
PHENYL salicylate
Phenyl benzoate

Solution : Methyl salicylate
Discussion
168.

Which nomenclature is not acording to IUPAC system ?

Answer»

`underset("4-Bromo-2, 4-dimethylhexane")(CH_(3)-CH_(2)-overset(CH_(3))overset(|)underset(BR)underset(|)CH-CH_(2)-underset(CH_(3))underset(|)CHCH_(3))`

`underset("5-Oxohexanoic acid")(CH_(3)-underset(O)underset(||)C)-CH_(2)-CH_(2)-CH_(2)COOH`
`underset("1-Bromoprop-2-ene")underset()(Br-CH_(2)-CH=CH_(2))`

Solution :According to IUP AC system of nomenclature, preference is to be GIVEN to multiple bonds over halogen substituent, hence correct name of
`Br-overset(3)CH_(2)-overset(2)CH=overset(1)CH_(2)` is 3-bromoprop-1-ene.
Discussion
169.

Which one of the following elements constitutes a major impurity in pig iron?

Answer»

Silicon
Oxygen
Sulphur
Carbon

ANSWER :D
Discussion
170.

Which of the following compound having maximum solubility and highest boiling point ?

Answer»

Ethanol
Ethane-1,2-diol
Propane-1,2,3-triol
Butan-1-ol

Solution :Propane-1,2,3-triol
Discussion
171.

Write the Arrhenius equation and mention what each term stands for.

Answer»

Solution :Arrhenius equation K = `AE^(-Ea//RT) `- k-rate CONSTANT
A = Arrhenius constant
`E_(a)`= ACTIVATION ENERGY
T = TEMPERATURE R = gas constant
Discussion
172.

Which of the following volume (V) temperature (T) plots represents the behaviour of one mole of an ideal gas at one atmospheric pressure:

Answer»




ANSWER :C
Discussion
173.

What are the symptoms seen due to histamine?

Answer»

Cold 
Redness of SKIN 
Itching in BODY 
All of the GIVEN 

SOLUTION :All of the given
Discussion
174.

Three compounds A,B and C have empirical formula CrCl_(3).6H_(2)O.they are kept in a container with a dehydrating agent and they lost water and attaining constant weight as shown below.

Answer»

Solution :`(A)-[Cr(H_(2)O)_(3)Cl_(3)].3H_(2)O` `(B)-[Cr(H_(2)O)_(4)Cl_(2)].CL.2H_(2)O`
`(C ) -[Cr(H_(2)O)_(6)]Cl_(3)`
Discussion
175.

Which acid of each pair shown here would you expect to be stronger? (iii) FCH_2CH_2CH_2COOH or CH_3CHFCH_2COOH

Answer»


Answer :`CH_3CHFCOOH` (PRESENCE of F near the carboxyl GROUP STABILISES the carboxylate ANION)
Discussion
176.

Which of the following explains the viscous nature of glycerol

Answer»

Covalent bonds
Hydrogen bonds
Vander Waal's FORCES
Ionic forces

Solution :Glycerol undergoes extensive hydrogen BONDING DUE to the PRESENCE of 3-OH groups. As a result the glycerol molecules are highly associated and THUS it has high viscosity.
Discussion
177.

Which of the following is an example of ketohexose?

Answer»

Mannose
Galactose
Maltose
FRUCTOSE

Solution :Fructose, it has ketonic GROUP. So it is KETOHEXOSE SUGAR.
Discussion
178.

Total number of optically inactive stereoimers of succinic acid are

Answer»


ANSWER :6
Discussion
179.

Which of the following phenomenon is applicable to the process shown in the Fig. ?

Answer»

absorption
Adsorption
Coagulation
Emulsification

Solution :is the CORRECT ANSWER.
Discussion
180.

Which of the following pairs have the same bond angle ?

Answer»

ETHANE and ethyne
Ethane and ethene
Ethene and benzene
Ethyneand benzene

Answer :C
Discussion
181.

Which of the following graphs correspond to first order reaction ?

Answer»




ANSWER :A
Discussion
182.

What happens to most probable kinetic energy and the energy of activation with increase in temperature?

Answer»

Solution :lways temperature (t)`prop` maximum probable kinetic energy as the temperature increases kinetics energy also increase.As the temperature increases the fraction of molecule with MAX probable kinetic energy increase .By increasing temperature `10^(@)` K is doubled

As the temperature increases energy of ACTIVATION and energy BARRIER decreases.
`k=Ae^(-(E_(a))/(RT))`
So `E_(a)prop (1)/(T)`
Temperature `Rprop(1)/(E_(a))`
On increasing temperature `E_(a)` decreases.
Discussion
183.

The reduction potential ofhydrogen half-cell will be negative if:

Answer»

`p(H_(2))=1` ATM and `[H^(+)]=2.0M`
`p(H_(2)) =1` atmand `[H^(+)] =1.01M`
`p (H_(2)) =2` atm and `[H^(2)]=1.0M`
`p(H_(3))=2` atm and `[H^(+)]=2.0M`

Solution :`H^(+) +e ^(-) to 1/2 H_(2)`
`E =E^(@) =(0.059)/(1) log ""([P (H_(2))]^(1//2))/([H^(+)])`
Now if`PH_(2)=2`atm and `[H^(+)]=LM`
then `E= 0- (0.059)/(1) log""(2^(1//2))/(1) =(-0.059)/(2) log 2`
Discussion
184.

What is the oxidising agent in chlorine water

Answer»

`HCl`
`HClO_(2)`
`HOCl`
NONE of these

Solution :`Cl_(2)+H_(2)O RARR HCl+HOCl`
`HOCl TATT HCl +[O]`
`HOCl` can furnish, nascent oxygen.
Discussion
185.

Which of the following statement is true regardin g electrolysis of molten ICl ?

Answer»

`I_2` is LIBERATED at the cathode
`Cl_2` is liberated at the cathode
`I_2` is liberated at the ANODE
Both `I_2`and `Cl_2` are liberated at the anode

Solution :`IC l to I^(+) + CL^-` liberated at anode.
Discussion
186.

What is obtained finally by continued ammonolysis of alkyl halide ?

Answer»


ANSWER :QUATERNARY AMMONIUM SALT
Discussion
187.

Which one among the following is a chemical process ?

Answer»

DISTILLATION of SEA (salty) WATER
Crystallisation of impure salt (NACL)
Production of Iodine `(I_(2))` from sea-weeds
Sublimation of iodine `(I_(2))`

Solution :Distillation , crystallisation and sublimation all are the method of purification but the production of iodine from sea-weeds is a CHEMICAL process.
Discussion
188.

Which of the following alkyl halides will undergo S_(N)1 reaction most readily ?

Answer»

`(CH_(3))_(3)C-F`
`(CH_(3))_(3)C-Cl`
`(CH_(3))_(3)C-Br`
`(CH_(3))_(3)C-I`

Solution :The substitution reaction is favoured EASILY if C - X bond is weak. THUS, ALKYL IODIDE will undergo Substitution reactions most readily. ALSO `S_(N)1` is favoured by `3^(@)` alkyl halide most readily. Among those listed, all are `3^(@)` halides but reaction is most favoured by `(CH_(3))_(3) C-I`.
Discussion
189.

The total number of stereoisomers in open-chain aldohexose (such as glucose) is :

Answer»

8
4
16
2

Answer :C
Discussion
190.

Which halogen acid is most volatile?

Answer»

HF
HCL
HI
HBr

SOLUTION :HCl has LOWEST B.P.
Discussion
191.

Which of the following is not the colligative property ?

Answer»

VAPOUR pressure
Osmotic pressure
Elevation in BOILING point
Depression in FREEZING point

Answer :A
Discussion
192.

Which of the following are arrangd in the decreasing order of dipole moment?

Answer»

`CH_(3)Cl,CH_(3)BR,CH_(3)F`
`CH_(3)Cl,CH_(3)F,CH_(3)Br`
`CH_(3)Br,CH_(3)Cl,CH_(3)F`
`CH_(3)Br,CH_(3)F,CH_(3)Cl`

ANSWER :B
Discussion
193.

Which of the order is incorrect?

Answer»

`overset(o+)O-underset(O)underset(||)C-underset(O)underset(||)C-OHltH-underset(O)underset(||)C-OH`


`Et_(2)NHgtEt_(3)NgtEt-NH_(3)gtNH_(2)(In H_(2)O)`

SOLUTION :
(3) -1 effect
Discussion
194.

Which colourlss gas evolves, when NH_(4)Cl reacts with zinc in a dry cell battery

Answer»

`NH_(4)`
`N_(2)`
`H_(2)`
`Cl_(2)`

Solution :`2NH_(4)CL+Znto2NH_(3)+ZnCl_(2)+H_(2)UARR`.
Discussion
195.

The reagent, NH_(4)Cl and aqueous NH_(3) will precipitate

Answer»

`CA^(2+)`
`Al^(3+)`
`Bi^(3+)`
`Mg^(2+)`

Solution :`Al^(3+)` (THRID group RADICAL) and `Ca^(2+)` (fifth grou radical) precipitate out as their hydroxide with `NH_(4)Cl` and aq. `NH_(3)(NH_(4)OH)` which are the group reagents.
Discussion
196.

Which of the following compounds are gemdihalides ?

Answer»

Ethylidene chloride
ETHYLENE DICHLORIDE
Methylene chloride
Benzyl chloride

Solution :(A) Ethylidine chloride
`CH_(3)-overset("Cl ")overset("| ")UNDERSET("Cl ")underset("| ")("C ")H`
(C ) Methylene chloride
`H-overset("Cl ")overset("| ")underset("H ")underset("| ")("C ")-Cl`
Discussion
197.

The substances that forms the plant cell walls is or which carbohydrates is an essential constituents of plant cells

Answer»

Cellulose
Sucrose
Vitamins
STARCH

ANSWER :A
Discussion
198.

Which type of ore is concentrated by froth-floatation?

Answer»

SOLUTION :SULPHIDE ORE.
Discussion
199.

Write the structure of the compound 4-ter-butyl-3-iodoheptane.

Answer»

SOLUTION :`overset(1)(CH_(3))-overset(2)(CH_(2)) -overset(I."3")overset(|)(CH_(3)) -underset(H_(3)C-underset(CH_(3))underset(|)(C)-CH_(3))underset(|)(overset(4)(CH))-overset(5)(CH_(2))-overset(6)(CH_(2))-overset(7)(CH_(3))`
Discussion
200.

Which of the following treatment will convert starch directly into glucose?

Answer»

Heating with dil. `H_(2)SO_(4)`
Fermentation by diastase
Fermentation by zymase
Heating with dil. NaOH

Solution :Fermentation by disatase willconvert STARCH intomaltosebut not glucose .
Discussion