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.

3001.

Which of the following ores is best concentrated by froth floatation method ?

Answer»

MAGNETITE 
SIDERITE 
Galena 
Malachite 

SOLUTION :Galena is sulphide ORE of LEAD (PbS)
Discussion
3002.

Two beaker A and B present in a closed vessel. Beaker A contains 152.4gaqueous solution of urea, containing12g of urea. Beaker B contains 196.2g glucose solution, containing 18g of glucose. Both solution allowed to attain the equilibrium. Determine wt. % of glucose in it's solution at equilibrium:

Answer»


Solution :Beaker A :
Mole fraction of urea
`= ((12)/(60))/((12)/(60)+(140.4)/(18)) = (0.2)/(0.2+7.8) = 0.025`
Beaker B :
Mole fraction of GLUCOSE
`= ((18)/(180))/((18)/(180)+(178.2)/(18)) implies 0.01`
Mole fraction of glucose is less so VAPOUR pressure above the glucose solution will be higher than the pressure above urea solution, so some `H_(2)O` molecules will transfer from glucose to urea side in order to make the solutions of equal mole fraction to attain equilibrium. Let X mole of `H_(2)O` transfered
`(0.2)/(0.2+7.8+x)=(0.1)/(0.1+9.9-x) implies x=4`
now mass of glucose solution `= 196.2-18xx4=124.2`
`WT. %` of glucose `= (18)/(124.2)xx100`
`implies 14.49%`
Discussion
3003.

Which property does not having by thermo- setting polymer ?

Answer»

STRONG
HARD
ELECTRICAL CONDUCTOR
Insulator

SOLUTION :Electrical conductor
Discussion
3004.

What do you mean by transcription?

Answer»

SOLUTION :The SYNTHESIS of MRNA from DNA strand is called trans.cription.
Discussion
3005.

Water glass is:

Answer»

Another NAME for sodium silicate
A special FORM of glass to STORE water only
Hydrated form of glass
Hydrated silica

Answer :A
Discussion
3006.

Which of the following is proteolytic enzyme:

Answer»

Insulin
Diastase
Pepsin
Adenine

Answer :C
Discussion
3007.

Which substances gives a different flames colouration from the other?

Answer»

Nitre
Caustic potash
Potassium Chloride
Table salt

Answer :D
Discussion
3008.

Which of the following gases is not a greenhouse gas

Answer»

CO
`O_(s)`
`CH_(4)`
`H_(2) O` vapour

Answer :A
Discussion
3009.

Which metal powder if spread in air, becomes hazardous?

Answer»

B
Al
Ca
K

Answer :B
Discussion
3010.

Which of the following does not affect the rate of reaction?

Answer»

AMOUNT of the reactants taken
Physical STATE of the reactants
`Delta` H of reaction
Size of the vessel

Answer :C
Discussion
3011.

Zone refining is based on the principle that....

Answer»

IMPURITIES of low boiling metals can be SEPARATED by distillation.
Impurities are more soluble in molten metal than in solid metal.
Different components of a mixture are DIFFERENTLY adsorbed on an adsorbent.
Vapours of VOLATILE compound can be decomposed in pure metal.

Answer :B
Discussion
3012.

Which of the following will have least hindered rotation about carbon-carbon bond ?

Answer»

Ethane
Ethene
Acetylene
HEXACHLOROETHANE

ANSWER :A
Discussion
3013.

Which of the following compounds gives SN^(1), SN^(2) and SN^(2) mechanisms?

Answer»




SOLUTION :Allyl halides UNDERGO `SN^(1), SN^(2)`, and `SN^(2)`.
Discussion
3014.

What one is used reactive towards S_(N^(1)) reaction?

Answer»

`C_(6)H_(5)CH(C_(6)H_(5))Br`
`C_(6)H_(5)CH(CH_(3))Br`
`C_(6)H_(5)C(CH_(3))(C_(6)H_(5))Br`
`C_(6)H_(5)CH_(2)Br`

Solution :`S_(N^(1))` reactions involve the formation of carbocations, order of stability of carbocation is `3^(@)gt2^(@)gt1^(@)` HENCE higher the stability of carbocation, more will be the reactivity of the parent alkyl halide. Moreover the tertiary carbocation formed from (c) is stabilized by two PHENYL GROUPS.
Discussion
3015.

Which of the following is Lyophobic colloid?Starch in water, Gum in water, Soap in water, Gold sol

Answer»

STARCH in water
Gum in water
Soap in water
Gold sol

Answer :A
Discussion
3016.

Which of the following is a not natural fibre ?

Answer»

STARCH
CELLULOSE
RUBBER
Nylon-6

SOLUTION :Nylon-6
Discussion
3017.

wheninitialconcentrationof a reactant isdubledin areactionitshalf -lifeperiod isnotaffected , theorderif thereaction is

Answer»

zero
first
second
morethanzerobutlessthanfirst

Solution :for a zero orderreaction `t_(1//2)` is directlyproportionalto theintial CONCENTRATION of THEREACTANT `|R|_(0)`
`t_(1//2)prop|R|_(0) `
for a firstorderreaction
`k=(2303)/(t) LOG ""(|R|_(0))/(|R|)`
` at t_(1//2)|R|=(|R|_(0))/(2)`
so the aboveequation becomes
`K=(2303)/(t_(1//2))log""(|R|_(0))/([R]_(0)//2)`
`t_(1//2)=(2303)/(K)= log ""2= (2303)/(K)xx.3010`
`t_(1//2) = (.693)/(K)`
i.e., half lifeperiodis independent of initial concentration of areactant .
Discussion
3018.

Write the structural formulae of the following compounds: (i) 3-Bromo-4-phenylpent-3-enoic acid. (ii) Hex-2-en-4-ynoic acid.

Answer»

Solution :(i) `overset(5)(C)H_(3)-underset(C_(6)H_(5))underset(|)overset(4)(C)=underset(Br)underset(|)overset(3)(C)-CH_(2)-COOH`
(ii) `overset(6)(C)H_(3)-overset(5)(C)-=overset(4)(C)-overset(3)(C)H=overset(2)(C)H-overset(1)(C)OOH`
Discussion
3019.

Which of the following is not a compound ?

Answer»

petrol
honey
STEAM
AIR

Solution :Steam is water and is THEREFORE, a COMPOUND
Discussion
3020.

Which of the following (1M) conducts more electricity ?

Answer»

SULPHURIC ACID
BORIC acid
ACETIC acid
PHOSPHOROUS acid
Discussion
3021.

Which amino acid contain secondary amino group in its structure ?

Answer»

GLYCINE
LYSINE
Alanine
PROLINE

Solution :Proline
Discussion
3022.

Which of the following compound will give curdy precipiate with AgNO_(3) solution:

Answer»




ANSWER :D
Discussion
3023.

Whichis formed when benzene is heated with chlorine in the presence of sunlight

Answer»

`C_6H_5C Cl_3`
`C_6H_5CHCl_2`
`C_6H_5CH_2Cl_2`
`C_6H_6Cl_6`

ANSWER :D
Discussion
3024.

Which of the following is used in fire extinguisher ?

Answer»

PYRENE
Phosgene
Phosphine
AMMONIA

ANSWER :A
Discussion
3025.

Which one of the following transition element has maximum oxidation states?

Answer»

MANGANESE
Copper
Scandium
Titanium

Solution :Manganese
Discussion
3026.

Which kind of isomerism is exhibited by octahedral Co(NH_(3))_(4)Br_(2)Cl?

Answer»

Geometrical and ionization
Geometrical and optical
Optical and ionization
Geometrical only.

Solution :`Ni(II)=3d^(8)4s^(0)`
Since the COMPLEX is paramagnetic, so the ligands do not induce pairing of d-orbitals and it would INVOLVE `sp^(3)` HYBRIDISATION forming tetrahedral geometry.

No. of unpaired electron = 2
Geometry : Tetrahedral.
Discussion
3027.

Which of the following combination is CORRECT ?

Answer»

(I) (i) (S)
(II) (ii) (R)
(III) (ii) (S)
(IV) (iii) (R)

Solution :Peptisation: Phenomenon in which a precipitate is pased into coiloidal form by adsorption of common ions on its surface.
Delta formation: When river water (SOL_) mets sea water (electrolyte) coagulaion occurs and elta is formed.
Tyndall EFFECT : Scattering of light rays by SUSPENDED particles in a colloids IA called Tyndall affect and sky looks Tyndall effect.
Protection of colloids : Protetive power of colloids in inversely RELATED to gold number.
Discussion
3028.

Which of the following compound react most readily with Lucas test ?

Answer»

Butane-1-ol
2 - METHYL propane-1-ol
2- Butane - 2- ol
2- Methyl propane - 2- ol

Solution :Lucas test responds speedy with `3^(@)` alcohol, slow with `2^(@)` alcohol and no reaction with `1^(@)` alcohol.
e.g. `CH_(3)- UNDERSET(OH)underset(|)overset(CH_(3))overset(|)C-CH_(3)`
Discussion
3029.

Which of the following compounds doesn't have linear structure

Answer»

`CO_(2)`
`SO_(2)`
`BeCl_2`
`C_(2)H_(2)`

Solution :`SO_(2)` MOLECULE SHOWS `sp^(2)`- hybridisationand bent STRUCTURE.
Discussion
3030.

Write the hybridisation and shape of [CoF_(6)]^(3-). [Atomic number of Co= 27]

Answer»

Solution :The complex `[CoF_(6)]^(3-)` is called outer orbital or high spin complex.
`Co^(3+)` ion
Hybridisation involved is `SP^(3)d^(2)`
Shape of the complex is OCTAHEDRAL.
Discussion
3031.

Thevapour pressureof waterat 298 K is 0.0231 barand the vapour pressureof a solutionof 108.24 g of a compound in 1000g of waterat thesame temperatureis 0.0228 bar.Calculate the molar mass of the solute.

Answer»

<P>

Solution :LOWERING in vapour pressure ,
` p_(A)^(@)- p_(A) = 0.0231 - 0.0228`
` = 0.0003` BAR
`(p_(A)^(@) - p_(A))/(p_(A)^(@)) = (w_(B)M_(A))/(w_(A)M_(B))` (For dilutesolutions).
`(0.0003)/(0.0231) = (108.24 xx 18)/(1000 xx M_(B))`
or `"" M_(B) = (108.24 xx 0.0231 xx 18)/(0.0003 xx 1000) = 150.0`
Discussion
3032.

Which of the following is correct about lyophilicsold?

Answer»

They are irreversible
They are formed by inorganic substances
They are READILY coagulated by addition of electroylstes
They are SELF stabilized

Solution :N//A
Discussion
3033.

What is the formal charge on nitrogen in NO_(3)^(-) ?

Answer»

3
1
-1
4

Solution :FORMAL CHARGE = + 1 on NITROGEN ATOM
Discussion
3034.

Why atomic masses are the average values?

Answer»

Solution :Most of the elements exist in different ISOTOPES, i.e., atosm with different MASSES, e.g., atoms with dfifferent masses, e.g., Cl has TWO isotopes with mass numbers 35 and 37 existing in the RATIO `3:1`. Hence, average value is taken.
Discussion
3035.

Which of the following reaction can produce aniline as main product ?

Answer»

`C_(6)H_(5)NO_(2)+n//KOH`
`C_(6)H_(5)NO_(2)+Zn//NH_(4)Cl`
`C_(6)H_(5)NO_(2)+LiAIH_(4)`
`C_(6)H_(5)NO_(2)+Zn//HCl`

Solution :Reduction of nitrobenzene in acidic MEDIUM froms ANILINE as
Discussion
3036.

Write names of anaglgesic drungs ?

Answer»

Solution :(i) Novalgin (II) MORPHINE (III) ANALGIN.
Discussion
3037.

When 3 moles of A and 1 mole of B are mixed in 1 litre vessel the following reaction takes place A_((b))+B_((g))hArr2C_((g)).1.5 moles of C are formed. The equilibrium constant for the reaction is

Answer»

`0.12`
`0.25`
`0.50`
`4.0`

SOLUTION :`UNDERSET((3-0.75))(A)+underset((1-0.75))(B)tounderset(1.5)(2C)`
`K=([C]^(2))/([A][B])=((1.5)^(2))/(2.25xx0.25)=(2.25)/(2.25xx0.25)=4.0.`
Discussion
3038.

Which of the following is best methylating agent?

Answer»

`CH_(3)CL`
`CH_(3)I`
`CH_(3)F`
`CH_(3)Br`

Answer :B
Discussion
3039.

What will happen, anode is made of nickel instead af graphite in the extraction of aluminium from AICl_3?

Answer»

 Nickel will be AFFECTED by HIGH TEMPERATURE
Nickel will combine with `Cl_2`
Nickel is insulator
Al of these

Answer :B
Discussion
3040.

Which oxide of halogen is formed when HIO_3 is heated at 170^(@)C ?

Answer»

`I_2O_3`
`I_2O_5`
`I_2O_7`
`I_2O_4`

SOLUTION :`2HIO_3 to I_2O_5 + H_2O`
Discussion
3041.

The starting substance for the preparationof 2-iodoprpaneby hydroodination is

Answer»

`CH_(3)CHOHCH_(3)`
`CH_(3)-CH=CH_(2)`
`C_(2)H_(5)CHO`
`CH_(3)COOH_(3)`

Answer :B
Discussion
3042.

What products are formed when the following compounds is treated with Br_(2) in presence of FeBr_(3)-

Answer»




SOLUTION :
Discussion
3043.

Which of the following are paramagnetic ?

Answer»

`[Ni(CN)_(4)]^(2-)`
`[NiCl_(4)]^(2-)`
`[CoF_(6)]^(3-)`
`[Co(NH_(3))_(6)]^(3+)`

Answer :B::C
Discussion
3044.

Which compound is capable of strong hydrogen bonding :

Answer»

`C_4H_9OH`
`C_3H_7OH`
`C_2H_5OH`
`C_5H_(11)OH`

ANSWER :C
Discussion
3045.

Write structures of different isomeric amines corresponding to the formula, C_4 H_(11) N.

Answer»

Solution :For (i) and (ii) refer to follow up PROBLEM 11. (iii) Position ISOMERS : (i) and (ii), (V) and (vi)Chain isomers: (i) and (iii), (vi), (i) and (vii) Metamers: (v) and (vii), (vi) and (vii) Functional isomers: All `1^@`amines are functional isomers of 29 and 30 amines and vice versa.
Discussion
3046.

Which of the following is not cleaved by HI even at 525 K

Answer»

`C_6H_5-O-CH_3`
`CH_3-O-C_2H_5`
`C_6H_5-O-C_3H_7`
`C_6H_5-O-C_6H_5`

ANSWER :D
Discussion
3047.

Two Aqueous solutions S _(2) and S_(2) are separated by a semipcrmcable membrane. Solution S_(1) has got a grcalcr vapour pressure than solution S_(2). Water will be flowing

Answer»

from `S_(1)` to `S_(2)`
from `S_(2) ` to `S_(1)`
in both the DIRECTIONS
in cither direction depending UPON the NATURE of the solute

Solution :In case of osmosis the flow of the SOLVENT, is from lower CONCENTRATION to higher concentration.
Discussion
3048.

The steady decrease in ionic size in lanthanides due ot lanthanide contraction and in all amount to

Answer»

`10` PM
`40` pm
`18` pm
`50` pm

Answer :C
Discussion
3049.

What is semi permeable membrane ? Give examples.

Answer»

Solution :The MEMBRANE which allows only the small molecule of solvent to PASS but can.t pass SOLUTE molecule as semi PERMEABLE membrane.
Example : These membranes can be of animal or vegetable origin and these occur naturally such as pig.s bladder or parchment or can be synthetic such as cell ophane.
These membranes appear to be continous sheets or films, YET they contain a network of submicroscopic holes or pores.
Discussion
3050.

The structure of the enol form of CH_(3)-CO-CH_(2)-CO-CH_(3) with intramolecular hydrogen bonding is____.

Answer»

SOLUTION :
Discussion