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.

6451.

Two faradays of electricity are passed through a solution of CuSO_(4). The mass of copper deposited at the cathode (at. Mass of Cu=63.5 amu)

Answer»

2 g
127 g
0 g
63.7 g

Solution :`CU^(2+)+2e^(-)toCu`
Thus, 2F charge deposit 1 MOL of Cu, i.e., 63.5g.
Discussion
6452.

What aremedicines ?

Answer»

SOLUTION :Medicinesare therapeticuseful CHEMICALS USED indiagnosis preventionandtreatmentof DISEASES.
Discussion
6453.

Which form of Sulphur shows paramagnetic behaviour? Or Sulphur in the vapour state exhibits paramagnetism.

Answer»

Solution :In the vapour STATE - 1000 K), Sulphur partly EXISTS as `S_(2)`, molecule which has two unpaired electrons in the antibonding `pi` molecular ORBITALS LIKE `O_(2)` and hence, `S_(2)` exhibits paramagnetism.
Discussion
6454.

Which is a by-product in Solvay's process ?

Answer»

`NH_3`
`CO_2`
`CaCl_2`
`CAO`

ANSWER :C
Discussion
6455.

Which of the properties listed below is not shown by interstitital compounds ?

Answer»

They are chemically REACTIVE.
They are very hard.
They have high MELTING points.
Their formulas do not correspond to any normal OXIDATION state.

ANSWER :A
Discussion
6456.

Which can be used in place of NH_(4)CI in III group precipitation

Answer»

`NH_(4)NO_(3)`
`(NH_(4))_(2)VrO_(4)`
`(NH_(4))_(2)SO_(4)`
NaCl

Answer :A
Discussion
6457.

What is the action of acidified potassiumdichromate onpotassium iodide (KI)?

Answer»

Solution :Acidifiedpotassium dichromate, `K_(2)Cr_(2)O_(7)` oxidises POTASSIUM IODIDE (KI) to iodine, increasing the oxidation state of iodine from -1 to ZERO.
`K_(2)Cr_(2)O_(7(aq)) +6KI_((aq)) +7H_(2)SO_(4(aq)) to 4K_(2)SO_(4)+Cr(SO_(4))_(3)+7H_(2)O+3I_(2)`
Discussion
6458.

Which of the following is not a correct statement

Answer»

Every `AB_(5)` molecules does in fact have SQUARE pyramid STRUCTURE
Multiple bonds are always shorter than corresponding single bond
The electron-deficient molecules can act as LEWIS acids
The CANONICAL structure have no real existence

Answer :A
Discussion
6459.

What is the mass of half of a mole of nitrogen atoms?

Answer»


ANSWER :7 G of NITROGEN
Discussion
6460.

What do you mean by rate of a reaction?

Answer»

SOLUTION :Rate is the change in concentration of REACTANT PER unit TIME
Discussion
6461.

Which among the following does not exhibit geometrical isomerism ?

Answer»

`CH_(3)CH=CHBr`

`(CH3)_(2)C=CHC_(2)H_(5)`
`CH_(3)CH=CHCHO`

Solution :
Discussion
6462.

Which of the following alkali metal halides has the lowest lattice energy ?

Answer»

NABR
NaCl
KBr
CsI.

Answer :D
Discussion
6463.

Which polymer is used to prepare plastic crokery ?

Answer»

Nylon-6
MELAMINE
PVC
BakelitE

Solution :Melamine
Discussion
6464.

Which of the following process is used for the concentration of Bauxite ? (Al_2O_3 . 2H_2O)

Answer»

FROTH floatation
Leaching
Liquation
Magnetic separation

Answer :A
Discussion
6465.

Which of the following postulate is incorrect regarding Dalton's Atomic Theory?

Answer»

Atoms areindivisible and indestructible
All the atoms of an element are not identical to each other. They have different MASSES and sizes
The RELATIVE numbers and KIND of atoms are always the same in a given compound
Chemical reactions only rearrange the WAY in which atoms are COMBINED , the atoms themselves are not changed

Answer :B
Discussion
6466.

Which is finally produced when acetylene reacts with HCl:

Answer»

`CH_2=CHCl`
`CH_3CHCl_2`
CLCH = CHCl
None of the above

ANSWER :B
Discussion
6467.

Write two differences between an ideal solution and a non-ideal solution.

Answer»

Solution :Ideal Non-ideal
OBEYS Roult's law at all range of concentration Does not obey
`Delta_("MIX") H=0, Delta_("mix") V=0"" Delta_("mix")H ne 0, Delta_("mix")V ne 0` (or any other difference)
Discussion
6468.

When HCl reacts with finely powdered iron it turne in to ferrous chloride and not ferric chloride. Why?

Answer»

SOLUTION :It FORMS `H_(2)` GAS `Fe+2Hcl""toFeCl_(2)+H_(2)` liberation of hydrogen prevents the formation of FERRIC chloride
Discussion
6469.

Whatisgangue ?

Answer»

SOLUTION :The earthlyandsiliciousimpuritiesassociatedwiththe ORES is calledgangue.
Discussion
6470.

Which of the following will produce only 1 product on reduction with LiAlH_(4)

Answer»

`CH_(3)OCOCH_(2)CH_(3)`
`CH_(3)CH_(2)OCOCH_(2)CH_(3)`
`CH_(3)CH_(2)OCOCH_(3)`
`CH_(3)CH_(2)OCOCH_(2)CH_(2)CH_(3)`

Solution :`LiAlH_(4)` in ether reduces ethyl acetate into ethyl ALCOHOL.
`CH_(3)COOC_(2)H_(5)+2H_(2) underset("ether")overset(LiAlH_(4))to2CH_(3)CH_(2)OH`
Discussion
6471.

Which compound in each of the following pairs will react faster in S_(N)2 reaction with OH^(-)? 1. CH_(3)Br or CH_(3)I.

Answer»

SOLUTION :`I^(Theta)` is a better LEAVING GROUP than `Br^(Theta)`. So `CH_(3)I` reacts faster with `OH^(Theta)` ion in the `S_(N)2` PATHWAY.
Discussion
6472.

Which of the following will react with water

Answer»

`CHCl_(3)`
`Cl_(2)C CHO`
`C Cl_(4)`
`ClCH_(2)CH_(2)Cl`

Solution :CHLORAL `(C Cl_(3)C HO)` readily reacts with `H_(2)O` to form chloral hydrate. This is due to the reason that the three ELECTRO withdrawing Cl ATOMS in `C Cl_(3)CHO` INCREASE the positive charge on the carbonyl carbon which holds the two OH groups firmly and thus favours the formation of stable hydrate.
Discussion
6473.

Which of the following is a highly corrosive salt?

Answer»

`FeCl_(2)`
`PbCl_(2)`
`HgCl_(2)`
`HgCl_(2)`

Solution :`HgCl_(2)` is highly POISNOUS is nature, It sublimes on heating and is, THEREFORE called corrosive SUBLIMATE.
Discussion
6474.

The vapour density of sample of partially decomposed cyclobutane (C_(4)H_(8) ) gas is 20. The degree of dissociation of C_(4)H_(8) into C_(2)H_(4) gas is

Answer»

0.25
0.5
0.6
0.4

Answer :D
Discussion
6475.

The standard reduction values of the three metallic cations X,Y and Z are 0.52 - 3.03 and -1.18 V respectively. The order of reducing power of the corresponding metals is

Answer»

`Y GT Z gt X`
`X gt Y gt Z`
`Z gt Y gt X`
`Z gt X gt Y`

ANSWER :A
Discussion
6476.

Write preparation of : (i) Xenon - Fluorine compounds (ii) Xenon - Oxygen compounds

Answer»

Solution :Xenon - Fluorine compounds : Xenon forms three binary fluorides, `XeF_2, XeF_4` and `XeF_6` by the direct reaction of ELEMENTS under appropriate experimental conditions.
`UNDERSET("excess")(Xe(g)) + F_(2)(g) overset(673 K, 1bar)to XeF_(2)(s)`
`underset(1:5 "ratio")(Xe(g) + 3F_(2)(g) overset(573 K)/(50-70 "BAR")to XeF_(6)(s)`
`XeF_6` can also be prepared by the interaction of `XeF_4` and `O_(2)F_(2)` at 143 K.
`XeF_(4) + O_(2)F_(2) to XeF_(6) + O_(2)`
Xenon-Oxygen compounds : Hydrolysis of `XeF_4` and `XeF_6` with water gives `XeO_(3)`
`6XeF_(4) + 12H_(2)O to 4Xe + 2XeO_(3) + 24HF + 3O_(2)`
`XeF_(6) + 3H_(2)O to XeO_(3) + 6HF`
Partial hydrolysis of `XeF_6` gives oxyfluorides,
`XeF_(6) + H_(2)O to XeOF_(4) + 2HF`
`XeF_(6) + 2H_(2)O to XeO_(2)F_(2) + 4HF`
Discussion
6477.

When dispersed phase is liquid and dispersion medium is a solid, the colloid is known as

Answer»

A SOLUTION
An emulsion
A GEL
A FOAM

ANSWER :C
Discussion
6478.

What is the name of Na_(3)[Ag(S_(2)O_(3))_(2)].

Answer»

Sodiumargentothisuplhate
SODIUM dithio sulphato angentate (I)
`HYPO`
Sodium thiosulphate

Answer :A::B::D
Discussion
6479.

Which of the following biphenyls is optically active ?

Answer»




ANSWER :A
Discussion
6480.

What is/are incorrect statement about E ?

Answer»

It can ecolve `CO_(2)` on reaction with `NaHCO_(3)`.
It can ive fruity smell on reaction with ETHANOL in PRESSURE of acidic medium.
It reacts with `SOCl_(2)` to give a PRODUCTS which can be converted to a compound by `H_(2)//d-BaSO_(4)`, which can reduced Tollen's reagent.
It can be reduced by Zn/Hg/HCl.

Solution :N//A
Discussion
6481.

Which one of the following undergoes reduction with hydrogen peroxide in an alkaline medium

Answer»

`Mn^(2+)`
HOCL
PbS
`Fe^(2+)`

SOLUTION :`HOCl +H_(2)O_(2) to HCl +H_(2)O +O_(2)`
Discussion
6482.

Which is the decreasing order of stability (i) CH_(3)-overset(+)(CH)-CH_(3)(ii) CH_(3)-overset(+)(CH)-O-CH_(3) (iii) CH_(3)-overset(+)(CH)-CO-CH_(3)

Answer»

`(i) LT (ii) lt (iii)`
`(i) gt (ii) gt (iii)`
`(iii) gt (ii) gt (i)`
`(ii) gt (iii) gt (i)`

Solution :`{:(CH_(3)-overset(+)(C)H gt CH_(3)-overset(+)(C)H gt CH_(3)-overset(+)(C)H),("|""|""|"),(""CH_(3)""OCH_(3)""COCH_(3)):}`
Discussion
6483.

Which step in aromatic electrophilic substitution reaction is exothermic in nature ?

Answer»


ANSWER :SECOND STEP i.e., FORMATION of substituted compound
Discussion
6484.

Which one of the following arrangements truly represent the property indicated against it ?

Answer»

`Br_(2) lt Cl_(2) lt F_(2) `bond energy <BR>`Br_(2) lt Cl_(2) lt F_(2)` electronegativity
`Br_(2) lt Cl_(2) lt F_(2)` oxidising POWER
`Br_(2) lt Cl_(2) lt F_(2)` ELECTRON affinity

Solution :Bond energy `= Cl_(2) GT Br_(2) gt F_(2) gt I_(2) `, Electronegative `= F_(2) gt Cl_(2) gt Br_(2) gt I_(2)`
Oxidising Power `=F_(2) gtCl_(2) gt Br_(2) gt I_(2) `, Electron affinity `= Cl gt F gt Br gt I`
Discussion
6485.

Which of the following reactions is an exampleof use of watergas inthesynthesis of ther compounds

Answer»

`CH_(4)+H_(2)UNDERSET(Ni)OVERSET(1270k)rarrCO(g)+H_(2)(g)`
`CO_(4)+H_(2)underset(catalyst)overset(673k)rarrCO(g)+H_(2)(g)`
`C_(n)H_(2n+2)+nH_(2)O(g)underset(Ni)overset(1270k)rarrnCO+(2n+1)H_(2)`
`CO_(g)+2H_(2)(g)underset("catalyst")overset("COBALT")rarrCH_(3)OH(l)`

Answer :D
Discussion
6486.

What is coagulation of a sol? Name two methods by which a lyophobic sol can be coagulated.

Answer»

Solution :The process of settling of colloidal particles is called COAGULATION of the SOL. The two methods by electrophoresis OR by boiling OR by adding an electrolyte OR by MIXING two oppositely charged SOLS.
Discussion
6487.

What is a soft soap ?

Answer»

Solution :Potassium salts of fatty ACIDS such as oleic ACID, palmitic acid and stearic acid are called SOFT SOAPS
Discussion
6488.

X and Y are.

Answer»




ANSWER :B
Discussion
6489.

Which of the following hydrated salt on heating undergo hydrolysis and doesn't give anhydrated salt.

Answer»

`SnCl_(2).2H_(2)O`
`Na_(2)SO_(4).10H_(2)O`
`Na_(2)CO_(3).10H_(2)O`
`Na_(2)SO_(4).8H_(2)O`

Solution :`SnCl_(2).2H_(2)O` on heating undergo HYDROLYSIS form `Sn(OH)Cl` and FINALLY tin oxide but not chloride
Discussion
6490.

Which of the following can be reduce easily

Answer»

`V(CO)_(6)`
`Mo(CO)_(6)`
`[CO(CO)_(4)]^(-)`
`Fe(CO)_(5)`

Solution :`V(CO)_(6)` easily REDUCES to `[V(CO)_(6)]^(-)`
Discussion
6491.

Which of the following reactions will yield 2,2-dibromopropane

Answer»

`HC-=CH+2HBr to`<BR>`CH_3C-=CH+2HBr to`
`CH_3CH=CH_2+HBR to`
`CH_3CH=CHBr + HBr to`

SOLUTION :`CH_3C-=CH+2HBr to CH_3-UNDERSET(Br)underset(|)oversetoverset(Br)(|)C-CH_3`
Discussion
6492.

Which of the following is not heavier than dry air ?

Answer»

`SO_(2)`
`O_(2)`
`CO_(2)`
MOIST AIR

ANSWER :D
Discussion
6493.

When petroleum is heated gradually, first batch of vapours evolved will be rich in:

Answer»

Kerosene
Petroleum ether
Diesel
Lubricating oil

Answer :B
Discussion
6494.

The second most electronegative elements in periodic table is:

Answer»

F
O
Cl
N

Answer :B
Discussion
6495.

Which of the following is reversible process

Answer»

Melting of ice at `10^(@)C`
Mixing of two gases by diffusion
EVAPORATION of WATER at `100^(@)C` and 1 atm PRESSURE
None of the above

ANSWER :A
Discussion
6496.

Using the data given in Q.8 find out in which option the order of reducing power is correct?

Answer»

`Cr^(3+)ltCl^(-)ltMn^(2)ltCr`
`Mn^(2+)ltCl^(-)ltCr^(3+)ltCr`
`Cr^(3+)ltCl^(-)ltCr_(2)O_(7)^(2-)ltMnO_(4)^(-)`
`Mn^(2+)ltCr^(3+)ltCl^(-)ltCr`

SOLUTION :Lower the value of standard EDUCATION potential greater will be the reducing POWER
Discussion
6497.

Total number of structural isomer of C_(9)H_(18) containg cyclohexane ring.

Answer»


SOLUTION :
Discussion
6498.

What is the osmotic pressure of a 0.0020 mol dm^(-3) sucrose (C_(12)H_(22)O_(11)) solution at 20^(@)C (Molar gas constant, R=8.314 JK^(-1)mol^(-1), 1dm^(3)=0.001 m^(3))

Answer»

4870 PA
4.87 Pa
0.00487 Pa
0.33 Pa

ANSWER :A
Discussion
6499.

The values of van't Hoff factors for KCl, NaCl and K_(2)SO_(4), respectively, are ……..

Answer»

2, 2 and 2
2, 2 and 3
1, 1 and 2
1, 1 and 1

Solution :`KCL rarr K^(+)+CL^(-)"( 2 ions)", NaCl rarr Na^(+) +Cl^(-)"( 2 ions)", K_(2)SO_(4) rarr 2K^(+)+SO_(4)^(2-)" (3 ions)".`
Discussion
6500.

Which one is used in making non-breakable cups and laminated sheets?

Answer»

BAKELITE
UREA FORMALDEHYDE
PHBV
teflon

Solution :urea formaldehyde
Discussion