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.

14001.

Which of the followingcombinations in an aqueous medium will give a yellow ppt. ?

Answer»

`AgNO_(3) + NaBr`
`Pb(CH_(3)COO)_(2) + Na_(2)CrO_(4)`
`Fe^(3+) + OVERSET(Θ)SCN`
None of these

Answer :a,b
Discussion
14002.

Write the total number of cyclic structural as well as stereosiomers possible for a compound with the molecular formula C_(5)H_(10).

Answer»


ANSWER :7
Discussion
14003.

What are hormones? Give examples.

Answer»

Solution :HORMONE is an organic SUBSTANCE that is secreted by one tissue into the blood stream and induces a physiological response in other tissues. It is an inter cellular signaling molecule.
Virtually every PROCESS is a complex organism is regulated by one or more hormones.
Example, insulin, epinephrine, estrogen, ANDROGEN etc.
Discussion
14004.

What is the frequency of microwave with a wave length of 4.33x10-3 m?

Answer»

SOLUTION :`6.9xx10^(10)HZ`
Discussion
14005.

Which adsorption takes place at low temperature ?

Answer»

PHYSICAL adsorption
Chemical adsorption
Both (a) and (B)
None

Answer :A
Discussion
14006.

Which is a stronger reducing agent Cr^(2+) or Fe^(2+) and why?

Answer»

Solution :`Cr^(2+)` is stronger reducing agent than `FE^(2+)` because in case of chromium the configuration changes from `d^(4) " to" d^(3).d^(3)` is STABLE in aqueous medium DUE to HALF filled `t_(2_(g))` orbitals while in case of Fe, the configuration changes from `d^(6)` to `d^(5)`. As the stability of `d^(3)` is more than `d^(5)` in aqueous medium, `Cr^(2+)` is a good reducing agent.
Discussion
14007.

When ethyl hydrogen sulphate is heated with excess of ethyl at 413 K, the product is :

Answer»

Ethane
ETHYLENE
DIETHYL ether
Diethyl sulphate.

Solution :NA
Discussion
14008.

Which of the following disproportionate on heating with sodium hydroxide ?

Answer»

`P_4`
`S_8`
`Cl_2`
B

Solution :(A)`P_4+3NaOH+3H_2Ooverset(DELTA)toPH_3+3NaH_2PO_2`
(B)`4S+6 NAOH oversetDeltatoNa_2S_2O_6+2Na_2S+3H_2O`
( C)`3Cl_2+6NaOHoversetDeltato5NaCl + NaClO_3+3H_2O`
(D)`2B+6 NaOH oversetDeltato2 Na_3BO_3+3H_2`
Discussion
14009.

Which of the following have the same mass?

Answer»

0.1 MOLE of `O_(2)` GAS
0.1 mole of `SO_(2)` gas
`6.023xx10^(22)` MOLECULES of `SO_(2)` gas
`1.204xx10^(23)` molecules of `O_(2)` gas

Answer :B::C
Discussion
14010.

Which one of the following elemen does not dissolve in fused or aqueous alkalies?

Answer»

BORON
Silicon
Aluminium
None of these

Solution :Boron dissolved in fused ALKALIES according to the following REACTION.
`2B+6NaOHoverset("fused")to2Na_(3)BO_(3)+3H_(2)`
Silicon and aluminium dissolved in both fused and aqueous alkalies.
Discussion
14011.

What is the difference between the EAN value of central metla ion in Na_(2)[Fe(CN)_(5)NO]" and "[Fe(H_(2)O)_(5)NO]SO_(4)

Answer»


SOLUTION :`|(26-2+12)-(26-1+12)|=1`
Discussion
14012.

What is Fischer esterification?

Answer»

Solution :When a carboxylic acid is HEATED with an ALCOHOL in the presence of concentrated sulphuric acid or dry hydrogen chloride gas, an ester is obtained. The reaction is called Fischer esterification. This is reversible reaction and the formation of ester is favoured USING excess of alcohol in the presence of conc. `H_(2)SO_(4)`. Here, concentrated sulphuric acid acts as dehydrating agent.
`underset("carboxylic acid alchol")(R - overset(O)overset(||)C- OH + HO-R) overset(H^(+))hArr underset("ester")(R-overset(O)overset(||)(C)-O-R+H_(2)O+)`
e.g., `underset("acetic acid")(CH_(3)) - overset(O)overset(||)(C) - OH + H underset("ethyl alchol")-O C_(2)H_(5) underset(Delta)overset(conc. H_(2)SO_(4))to underset("ethyl ACETATE")(CH_(3)-overset(O)overset(||)(C) -OC_(2)H_(5) +H_(2)O)`
`underset("propionic acid")(CH_(3)-CH_(2))-overset(O)overset(||)(C) - OH+ CH_(3) - OH underset(Delta)overset(conc.H_(2)SO_(4))to underset("methyl propiobate")(CH_(3)-CH_(2))- overset(O)overset(||)(C) - OCH_(3) + H_(2)O`
Discussion
14013.

Whatareessentialaminoacids ? Givean example.

Answer»

Solution :Amino acids which cannot be synthesised in the body and mustbe supplied through DIET. EX : LYSINE, LEUCINE.
Discussion
14014.

Which of the following defines the term opiatcs?

Answer»

NARCOTIC ANALGESICS obtained from the opium poppy.
Non-narcotic analgesics which reduce fever.
Narcotic drugs that inhibit PATHOGENIC microbes.
Tranquilizers used to INDUCE sleep.

Solution :Morphine narcotics are sometimes referred to as opiates, since they are obtained from the opium poppy.
Discussion
14015.

Which of the following is not the characteristic of interhalogen compounds ?

Answer»

They are more reactive than halogens
They are QUITE UNSTABLE but none of them is explosive
They are covalent in nature
They have low BOILING points and are highly volatile.

Answer :D
Discussion
14016.

Which of the following is used in respiratory tract infection ?

Answer»

Oflaxacin
Tranquilizers
BHT
BHA

Answer :A
Discussion
14017.

When a solution of sodium chloride containing ethyl alcohol is electrolysed, it forms:

Answer»

ETHYL CHLORIDE
CHLORAL
CHLOROFORM
acetaldehyde

Solution :N//A
Discussion
14018.

What do you mean by 18 carat gold ?

Answer»

Solution :An alloy of GOLD containing 18 parts by weight of pure gold, i.e., 75% gold and 25% COPPER is called 18 CARAT gold
Discussion
14019.

When isopentane is subjected to mono chlorination, what will be the number of monochlorinated products contain chiral carbon

Answer»


SOLUTION :
Discussion
14020.

Write the ionic equation representing the oxidising property of acidified KMnO4 solution.

Answer»

Solution :`MnO_(4)^(-)+5E^(-)+8H^(+)to MN^(2+)+4H_(2)O`.
Discussion
14021.

Whichvitamin deficiencyleadsto Hairloss , musclepain ?

Answer»

BIOTIN
NIACIN
RIBOFLAVIN
THIAMINE

ANSWER :A
Discussion
14022.

Which of following ketone racemises in aqueous solution containing some acidic or basic impurities.

Answer»

`CH_3undersetunderset(Ph)(|)CH-undersetunderset(Ph)(|)CH-undersetunderset(O)(||)C-CH_3`
`C_2H_5-undersetunderset(CH_2)(|)CH-undersetunderset(O)(||)C-CH_3`
`C_6H_5-undersetunderset(O)(||)C-undersetunderset(Ph)(|)oversetoverset(CH_3)(|)C-C_2H_5`

Solution :If H, present on the CHIRAL carbon, UNDERGOES TAUTOMERISATION , we will GET racemic mixture.
Discussion
14023.

Which polymer is obtained from following reaction ? CF_(2)CF_(2)overset([NH_(4)]_(2)S_(2)O_(8))underset("high pressure")rarr?

Answer»

TEFLON
POLYPROPENE
ORLON
Rayon

Solution :Teflon
Discussion
14024.

Transition metal compound are coloured due to d-d and charge transfer tranditoins, Colour due to d-d transition is shown by transition metal compounds having d^(1) and d^(9) electrons whereas the compounds containing d^(0) and d^(10) configurations are intensely coloured due to charge transfer transitions. For the same transition metal ion, the colour of its compounds will depend upon

Answer»

Temperature of the reaction
Pressure of the reaction
Nature of LIGANDS or Lewis bases attached to the METAL ION
Concentration of the ligands

Solution :Colour of the COMPOUNDS of the same transition metal ion depends upon the nature of ligands attached to it. For example, `[CuCl_(4)]^(2-)` is greenish yellow, `[Cu(H_(2)O)_(4)]^(2+)` is blue but `[Cu(NH_(3))_(4)]^(2+)` is violet or deep blue.
Discussion
14025.

Which one of the following is used as food preservative?

Answer»

SODIUM formate
Sodium acetate
Sodium BENZOATE
Acetamide

SOLUTION :Sodium benzoate
Discussion
14026.

What type of drug is chloramphenicol?

Answer»

SOLUTION :BACTERIOSTATIC BROAD SPECTRUM ANTIBIOTIC.
Discussion
14027.

The size of the trivalent cations in the lanthanoid series decreases steadily as the atomic number increases. What is this known as ?

Answer»

SOLUTION :LANTHANOID CONTRACTION.
Discussion
14028.

Which compound is aromatic

Answer»




SOLUTION :
Here number of `pi` electrons = 2
The compound is cyclic and obeys Huckel's (4n+2) rule[Here n=0] . Hence the compound is AROMATIC
Discussion
14029.

Which of the following will have two stereoisomeric forms? (I) [Cr(NO_(3))_(3)(NH_(3))_(3)] (II) K_(3)[Fe(C_(2)O_(4))_(3)] (III) [CoCl_(2)(en)_(2)]^(+) (IV) [CoBrCl(o x)_(2)]^(3-)

Answer»

I only
I and II
III and IV
All of these

Solution :
Discussion
14030.

which of the following statements is not true regarding addition of bromine to ethylene ?

Answer»

The REACTION is TERMED as ELECTROPHILIC addition reaction
In the first step, bromine adds to ethylene to form a cyclic bromonium ion.
Bromine is less reactive than chlorine for the reaction
The FINAL product is cis-dibromoethane

Answer :D
Discussion
14031.

which of thefollowingon heating with aqueous KOH produces acetaldehyde?

Answer»

`CH_3CH_2Cl`
`CH_2ClCH_2Cl`
`CH_3CHCl_2`
`CH_3COCl`

ANSWER :C
Discussion
14032.

Which of the following statements is/are true about an azeotropic mixture?

Answer»

An azeotropic mixture BOILS at constant temperature.
The composition of an azeotropic mixture CHANGES on DISTILLATION.
An azeotropic solution of two liquids has a BOILING point lower than that of either of them when it shows positive deviation from the Raoult's law.
An azeotropic solution of two liquids has a boiling point higher than that of either of them if it shows positive deviation from Raoult's law.

Answer :A::C
Discussion
14033.

The sum of the first three ionization energies of the lanthanoides Ce, Eu, Gd, Yb, Lu is

Answer»

`CE gt E gt Fe gt Yb gt Lu`
`Yb gt Lu gt E ugt GD gt Ce`
`Yb gt Eu gt Gd gt Ce`
`Yb gt Eu gt Lu gt Gd gt Ce`

Solution :From left to RIGHT
Discussion
14034.

Which of the following alcohols would be most likely to undergo dehydration with rearragement by a process involving a methyl migration (methyl shift only) ?

Answer»




ANSWER :A
Discussion
14035.

What is the purpose of this apparatus?

Answer»

Distilling
Filtering
Refluxing
Titrating

Answer :C
Discussion
14036.

Which can be directly brought into solid state from gaseous state ?

Answer»

`CO`
`CO_2`
`PH_3`
`CO+H_2`

ANSWER :B
Discussion
14037.

What is the major prudct obtained when phenol is treated with chloroform and aqueous alkali

Answer»




SOLUTION :NA
Discussion
14038.

Which of the following compound is expected to be optically active ?

Answer»

`(CH_(3))_(2)CHCHO`
`CH_(3)CH_(2)CH_(2)CHO`
`CH_(3)CH_(2)CHBrCHO`
`CH_(3)CH_(2)CBr_(2)CHO`

SOLUTION :`H_(3)C-overset("H ")overset("|")UNDERSET(CH_(3))underset("|")("C ")-CHO RARR`No optically active C - atom is present.
`CH_(3)-CH_(2)-overset(H)overset("|")underset(H)underset("|")(C )-CHO rArr`No optically active C - atom is present.
`CH_(3)-CH_(2)-overset("Br")overset("| ")underset("Br")underset("| ")("C ")-CHO rArr` No optically active C - atom is present.
`CH_(3)-CH_(2)-overset("Br")overset("| ")underset("H")underset("|")(C^(**))-CHO rArr`Presence of optically active C*atom,so the COMPOUND is optically active.
Discussion
14039.

Which acid possesses oxidizing, reducing and complex forming properties:

Answer»

`HNO_3`
`H_2SO_4`
HCL
`HNO_2`

ANSWER :D
Discussion
14040.

What is Lanthanoid contraction ?Mention the cause for it .

Answer»

Solution :Lanthanoid contraction : The overall DECREASE in atomic and ionic radii from lanthanum to leutetium is observed in the lanthanoids. This phenomenon is called lanthanoid contraction it is due to the fact that with every additional proton in the nucleus, the corresponding electron goes into a 4f nucleus as EFFECTIVELY as the more localized INNER shell. Hence, the attraction of the nucleus for the outermost electrons increases steadily with the atomic number.
Consequences of Lanthanoid Contraction: The important conquences of lanthanoid contraction are as follows:
(i) Basic character of oxides and hydrpxides:
Due to the lanthanoid contraction the covalent nature of La-OH bond increases and thus, the basic character of oxides and hydroxides decreases from La `(OH)_(3)` to Lu `(OH)_(3)`.
(iii) Similarity in the size of elements of second and third transition series:Because of lanthanoid contraction, elements which follow the third transition series are considerably smaller than would otherwise be expected. The normal size increases from `SC rarr Y rarr La` and disappears after lanthanides. Thus paris of elements such as `Zr//Hf`, `Hb//Ta` and `Mo//w` are almost identical in size. Due to almost similar size, such pairs have very similar properties which MAKES their separation difficult.
(iii) Separation of ianthanoids : Due to lanthanoid contraction, there is a difference in some properties of lanthanoid like solubility, degree of hydration and complex formation. These difference enable the separation of lanthanoids by ion exchange method.
Discussion
14041.

When same quantity of electricity is passed for half an hour, the amount of Cu and Cr deposited are respectively 0.375 g and 0.30 g. Ratio of electrochemical equivalent of Cu and Cr is

Answer»

`0.8`
`1.25`
`2.5`
`1.62`

ANSWER :C
Discussion
14042.

Which one of the following is not present in RNA ?

Answer»

Thymine
Ribose
Uracil
Phosphate

Answer :A
Discussion
14043.

Which one is an acidic dye ?

Answer»

Methyl orange
Methyl red
Phenolphthalein
All of these

Solution :ACID dyes are charactertised by the PRESENCE of -COOH, -`SO_(3)H` or Phenolic group. They are applied in the presence of acidic solution. They are usually applied to WOOL, SILK, Nylon. They have affinity for cotton. Common examples are Orange I, Orange II, Methyl red etc.
Discussion
14044.

Which of the following is polymer of D-glucose?

Answer»

Starch
Surcose
Cellulose
Cellobiose

Solution :(B) and (d) are not POLYMERS.
Discussion
14045.

What is the role of depressant in froth floatation process?

Answer»

Solution :The depressants are used to prevent certain types of particles from forming the froth with bubbles in froth floatation PROCESS. This helps to separate two sulphide ores. For example, in case of an ore containing zinc sulphide (Zn) and lead sulphide (PbS), sodium, cyanide (NaCN) is used as a depressant. It forms a LAYER of zinc complex `Na_2[Zn(CN)_4]` with ZnS on the surface of ZnS and therefore, prevents it from forming the froth. Therefore, it ACTS as a depressant.
`ZnS + 4NaCN tounderset("tetracyanozincate(II)")(Na_2[Zn(CN)_4])+ Na_2S`
However, NaCN does not prevent PbS from forming the froth and allows it to COME with the froth.
Discussion
14046.

The substance which lowers the acidity of the stomach is called _______

Answer»


ANSWER :ANTACID
Discussion
14047.

Which one of the following will react with AgNO_(3) solution to form a white precipitate:

Answer»





SOLUTION :
Discussion
14048.

Write expressions for equivalent conductivity and molar conductivity of Al_(2)(SO_(4))_(3) at infinite dilutio in terms of their ionic conductivitiies.

Answer»

Solution :`wedge_(EQ)(Al_(2)SO_(4))=lamda_(Al^(3+))^(@)+lamda_(SO_(4)^(2-))^(@),wedge_(m)(Al_(2)SO_(4))_(3))=2lamda_(Al^(3+))^(@)+3lamda_(SO_(4)^(2-))^(@)`
Discussion
14049.

Which process requires maximum energy :-

Answer»

`Na(G) to Na^(+)(g) +E^(-)`
`AL^(+3)(g) to Al^(+4)(g) +e^(-)`
`Al^(+2)(g) to Al^(+3)(g) +e^(-)`
`Na^(+)(g) to Na^(+2)(g) +e^(-)`

Answer :B
Discussion
14050.

Write the role of Dilute NaCN in the extraction of silver.

Answer»

Solution :NaCN LEACHES SILVER from the ore in the presence of AIR.
`4Ag (s) +8CN^(-) (aq) +2H_(2)O +O_(2) (g) to 4[Ag(CN)_(2)]^(-) +4OH^(-)`.
Discussion