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.

13951.

Which catalyst is used in the manufacture of ammonia by Haber's process ?

Answer»

SOLUTION :In Haber.s PROCESS of MANUFACTURE of ammonia, the catalyst used in FE with molebdenum as promoter.
Discussion
13952.

What volume of 98% sulphuric acid should be mixed with water to obtain 200mL of 15% solution of sulphuric acid by weight ? Given density of H_(2)O=1.00 g cm^(-3), sulphuric acid (98%)=1.88g cm^(-3) and sulphuric acied (15%)=1.12g cm^(-3).

Answer»


Solution :It is a CASE of DILUTION, simplest way is to determine normally of the `98%` and `15% H_(2)SO_(4)`.
(i) For `98% H_(2)SO_(4) : 100g H_(2)SO_(4)` solution `=(100)/(1.88)cm^(3)` solution has `H_(2)SO_(4)=98g`
`N_(1)(98%)=(1000w_(1))/(E_(1)V)=(100xx98)/(49xx(100)/(1.88))=37.6N`
where `w_(1)` is the WEIGHT of solute of EQUIVALENT weight `E,` in `V mL` solution
(ii) For `15% H_(2)SO_(4) : 100g H_(2)SO_(4)` solution `=(100)/(1.12)cm^(3)` has `H_(2)SO_(4)=15g`
`N_(2)(15%)=(1000w_(1))/(E_(1)V)=(1000xx15)/(49xx(100)/(1.12))=3.43`
Using `N_(1)V_(1)=N_(2)V_(2)`
`37.6xxV_(1)=3.43xx200`
`V_(1)=18.2 mL`
Discussion
13953.

Xe + 2PtF_6 overset(25^@C)to [XeF]^(+) [ PtF_6]^(-) + PtF_5 then in the complex compound Xe Oxidation state is "+ 2" then oxidation of [PtF_6] is _______

Answer»


SOLUTION :
Discussion
13954.

Which one of the element may be expected to show highest second ionization enthalpy

Answer»

V
Cr
Mn
Fe

Answer :B
Discussion
13955.

The standard electrode potential corresponding to the reduction Cr^(3+)+ e to Cr^(2+) is E^@=-0.407 volt. IF excess Fe(s) is added to a solution in which [Cr^(3+)]=1M, what will be [Fe^(2+)] when equilibrium is established at 25^@C [Fe (s)+2Cr^(3+)leftrightarrow Fe^(2+)+ 2Cr^(2+)]

Answer»

SOLUTION :`[FE^(2+)]=0.42M]`
Discussion
13956.

Which of thefollowing follows Anti-Markownikoff's addition ?

Answer»

`CH_(3)CH=CH_(2)+HBr overset(Pero"X"ide)to CH_(3)CHBr-CH_(3)`<BR>`CH_(3)CH=CH_(2)+HBr overset(Pero"x"ide)to CH_(3)CH_(2)CH_(2)Br`
`CH_(3)CH=CH_(2)+HCl overset(Pero"x"ide)to CH_(3)CH_(2)CH_(2)Cl`
`CH_(3)CH=CH_(2)+HI overset(Pero"x"ide)to CH_(3)CHI-CH_(3)`

Answer :B
Discussion
13957.

Which of the following compounds are arranged in order of decreasing reactivity towardselectrophilic substitution

Answer»

p-chlrochlorbenzene `GT` o-chlorotoluene `gt` p-nitrochlorobezene
p-nitrochlorobenzene `gt` o-chlorotoluene `gt` p-chlorotoulene
p-chlorotoulene `gt` p-nitrochlorobenznen `gt` o-chlorotoluene
o-chlorotoluene `gt` p-chlorotolene `gt` p-nitrochlorobenzne

Answer :A
Discussion
13958.

The zig-zag motion of colloidal particles was first observed by :

Answer»

JOHN Tyndall
Robert Brown
Zsigmondy
Ostwald.

Answer :B
Discussion
13959.

Which of the following is paramagnetic ? Sc^(3+) (Z=21),Cu^(+)(Z=29)

Answer»

SOLUTION :NONE of them is PARAMAGNETIC because of the absence of UNPAIRED ELECTRONS.
Discussion
13960.

The term 'broad spectrum antibiotics ' means

Answer»

BACTERICIDAL antibiotics
BACTERIOSTATIC antibiotics
which KILL or inhibit a wide range of gram -ve and gram +ve BACTERIA
which kill or inhibit all types of gram +ve bacteria .

Answer :C
Discussion
13961.

Which of the following statements is/are true about the following compounds.

Answer»

(I) and (III) are STRUCTURAL ISOMERS
(I) and (II) are geometrical diastereomers
(II) and (III) are structural isomers
(I) and (II) are identical

Solution :I is TRANS isomer and II is cis isomers
I and III are position isomers similarly II and III are position isomers.
Discussion
13962.

What happens when? (i) Cyclohexanone reacts with morpholine (ii) Acetaldehyde reacts with alpha -chloro ehtylacetate in presence of Znltbr (iii) Acetaldehyde is heated with acetic anhybride. (iv) 4,4 Dimethylpentan-2-one is treated with Br_(2) in presece of NaOH (v) 2-Benzylcyclohexane-1,3-dione react with benzylechloride in presence of potassium ethoxide and ethanol.

Answer»

SOLUTION :
Discussion
13963.

Which type of solids are known as true solids

Answer»

Glass
Quartz
Plastic
Rubber

Answer :B
Discussion
13964.

To get a n-type semiconductor from silicon, it should be doped with a substance with valence

Answer»

2
1
3
5

Solution :5
Discussion
13965.

The types(s) of thebond in RNCis / are

Answer»

COVALENT
ionic
ionicand co-ordinate
covalentand co-ordinate

ANSWER :D
Discussion
13966.

Why carbohydrates are generally optically active?

Answer»

Solution :ALMOST all carbohydrates are optically active as , they have one or more chiral CARBON. Chirality results in OPTICAL activity.
Discussion
13967.

Which of the following is oligosaccharide :

Answer»

Sucrose
Maltose
Lactose
All

Answer :D
Discussion
13968.

Which will not go for diazotisation :

Answer»

`C_6H_5NH_2`
`C_6H_5CH_2NH_2`

ANSWER :B
Discussion
13969.

Which one of the elements with the following outer orbital configurations may exhibit the largest number of oxidation states?

Answer»

`3d^(5)4S^(1)`
`3d^(5)4s^(2)`
`3d^(2)4s^(2)`
`3d^(3)4s^(2)`

SOLUTION :
The no of various oxidation states possible are +2, +3, +4, +5, +6 and +7.
Discussion
13970.

When a chromite ore (A) is fused with sodium carbonate in free excess of air and the product is dissolved in water, a yellow solution of compound (B) is obtained. After treatment of this yellow solution with sulphuric acid, compound (C) can be crystallised from the solution. When compound (C) is treated with KCl, orange crystals of compound (D) crystallise out. Identify (A) to (D) and also explain the reactions.

Answer»

Solution :The compounds A, B, C and D are given as under:
`A=FeCr_(2)O_(4)``B=Na_(2)CrO_(4)``C=Na_(2)Cr_(2)O_(7).2H_(2)O``D=K_(2)Cr_(2)O_(7)`
The REACTIONS are explained as under :
`underset((A))(4FeCr_(2)O_(4)+8Na_(2)CO_(3)+7O_(2)to underset((B))(8Na_(2)CrO_(4))+2Fe_(2)O_(3)+8CO_(2)`
`2NaCrO_(4)+2H^(+)to Na_(2)Cr_(2)O_(7)+2Na^(+)+H_(2)O`
`underset((C))(Na_(2)Cr_(2)O_(7))+2KCL to underset((D))(K_(2)Cr_(2)O_(7))+2NaCl`
Discussion
13971.

Which of the following is required in lowest concentration to coagulate a positively charged Fe(OH)_3 sol ?

Answer»

`Na_2S_2 O_3`
`K_3[Fe(CN)_6]`
`[K_4[Fe(CN)_6]`
`Al_2[SO_4]_3`.

ANSWER :C
Discussion
13972.

The vapour pressure of two pure components A and B forming an ideal solution are 100 torr and 80 torr respectively. The total pressure of the solution obtained by mixing 2 mol of A and 3 mol of B is :

Answer»

48 torr
108 torr
88 torr
8 torr

Solution :`P_(A)=100xx2/5=40` MM HG,
`P_(B)=80xx3/5=48` mm Hg
`P_("(TOTAL)")=40+48=88` mm Hg
Discussion
13973.

Trioxalatoaluminate (III) and tetrafluoroborate(III) ions are :

Answer»

`[AL(C_(2)O_(4))_(3)], [BF_(4)]^(3-)`
`[Al(C_(2)O_(4))_(3)]^(3+), [BF_(4)]^(3+)`
`[Al (C_(2)O_(4))_(3)]^(3-), [BF_(4)]^(-)`
`[Al(C_(2)O_(4))_(3)]^(2-), [BF_(4)]^(2-)`

SOLUTION :trioxalatoaluminate (III) - `[Al(O X)_(2)]^(3-)`
TETRAFLUOROBORATE (III) - `[BF_(4)]^(-)`
Discussion
13974.

Write one difference between a-helix and B-pleated structures of proteins.

Answer»

Solution :Difference between C-helix and B-pleated structures of proteins.
In a-helix, the polypeptide chain forms all possible hydrogen BONDS by twisting into a RIGHT handed screw with the - NH GROUP of each amino acid RESIDUE hydrogen bonded to the of an adjacent turn of the helix .
In `beta` -STRUCTURE, all peptide chains are stretched out to nearly maximum extension and then laid side by side which are held together by intermolecular hydrogen bonds.
Discussion
13975.

Which of the following is not an example of electrophilic substitution ?

Answer»

KOLBE's reaction
OXIDATION of PHENOL
Reimer-Tiemann reaction
Bromination of phenol

Solution :Oxidation of phenol
Discussion
13976.

Which element has the highest electronegativity ?

Answer»

F
H
Ne
La

Answer :A
Discussion
13977.

Which of the following solutions will turn violet when a drop of lime juice is added to it ?

Answer»

A solution of NAI
A solution mixture of KI and `NaIO_(3)`
A solution mixture of NaI and KI
A solution mixture of `KIO_(3) and NaIO_(3)`

Solution :LIME juice gives the `H^(+)` ions.
`{:(KI overset(H^(+))RARR K^(+) HI , NaIO_(3) overset(H^(+))rarr Na^(+)+ HIO_(3)),(5HI + HIP_(3) rarr 3 I_(2) + 3 H_(2)O):}`
`I_(2)` THUS produces turns solution violet.
Discussion
13978.

When phenyl magnesium bromide reacts with ter- butyl alcohol, which of the following is formed ?

Answer»

TERT- butyl methl ether
Benzene
Tert-butyl benzene
PHENOL

ANSWER :B
Discussion
13979.

Which of the following colloids cannot be coagulated easily ?

Answer»

Lyophobic COLLOIDS
Irreversible colloids
Reversible colloids
LYOPHILIC colloids

Solution :Lyophilic colloids are reversible colloids which cannot be EASILY COAGULATED, i.e., (c ) and (d).
Discussion
13980.

Which of the following is not a molecular solid ?

Answer»

`H_(2)`
`I_(2)`
`CO_(2)`
`SiO_(2)`

ANSWER :D
Discussion
13981.

Which of the following compound will not undergo Cannizzaro reaction ?

Answer»

Benzaldehyde
2,2-Dimethylpropanal
Formaldehyde
Phenylethanal

Answer :D
Discussion
13982.

Zn(s)+2AgCl(s) hArr ZnCl_(2) (0.555 M)+2Ag(s) E_(0^(@)C)=1.015" volt"((dE)/(dT))_(P)=-4.02xx10^(-4) volt per degree. Find DeltaG, DeltaS

Answer»

<P>

SOLUTION :We KNOW that,
`DeltaH=nF [T((dE)/(dT))_(P)-E]`
`=2xx96500 [-273xx4.02xx10^(-4)-1.015]`
`=-217075.98" joule"=-217.075 KJ`
`DeltaG=-nFE=-2xx96500xx1.015=-195895 J`
`=-195.895 kJ`
`DeltaG=DeltaH-TDeltaS`
`-195.895=-217.075-273xxDeltaS`
`DeltaS=-0.07758 kJ =-77.58 J=-18.55` CAL
Discussion
13983.

Which of the following is a metalloid?

Answer»

K
Ge
Ce
Zn

Answer :B
Discussion
13984.

There is a very little difference in the acid strength in the acids H_(3)PO_(4), H_(3)PO_(3) " and " H_(3)PO_(2) because :

Answer»

phosphorus in these acids exists in DIFFERENT oxidation states
the hydrogen in these acids are not all bound to the phosphorus atom and have same number of unprotonated oxygen
phosphorus is highly ELECTRONEGATIVE ELEMENT
phosphorus oxides are LESS basic.

Solution :
Discussion
13985.

Which has maximum polarising power in cation ?

Answer»

`Li^(+)`
`Mg^(2+)`
`AL ^(3+)`
`O^(2-)`

Answer :C
Discussion
13986.

The specific reaction rates of a chemical reaction are 2.45xx10^(-5)sec^(-1)" at "273K and 16.2 xx10^(-4) sec^(-1) at 303 K. Calculate the activation energy.

Answer»

SOLUTION :`"96.101 kJ/mole"`
Discussion
13987.

While charging the leadstorage battery

Answer»

`PbSO_(4)` on cathode is reduced to Pb
`PbSO_(4)` on ANODE is oxidized to `PbO_(2)`
`PbSO_(4)` on anode is reduced to Pb
`PbSO_(4)` on cathodeis oxidized to Pb

Solution :REACTIONS occuring during charging are :
`{:("Anode :"PbSO_(4(s))+2e^(-)RARR Pb_((s))+SO_(4(AQ))^(2-)),("Cathode : "PbSO_(4(s))+2H_(2)OrarrPbO_(2(s))+SO_(4(aq))^(2-)+4H_((aq))^(+)+2e^(-)),(ulbar(2PbSO_(4(s))+2H_(2)OrarrPb_((s))+PbO_(2(s))+2H_(2)SO_(4(aq))"")):}`
Discussion
13988.

What is the action of conc. H_2SO_4 on sulfur?

Answer»

SOLUTION :SULFUR is oxidised to `SO_2`
Discussion
13989.

Which of the following electronic configuration belongs to a transition element ?

Answer»

KL `3s^2p^6d^5, 4S^1`
KL `3s^2p^6d^10, 4s^(2)4p^3`
KL `3s^2p^6d^10, 4s^(2)4p^3`
KLM `4s^2p^6d^10, 5S^(2)5p^1`

Answer :A
Discussion
13990.

Two solutions having same osmotic pressure are called _____ solution .

Answer»

SOLUTION :ISOTONIC
Discussion
13991.

Which is the most stable ion is formed in the protonation of (CH_3)_3C-O-CH_2CH_3

Answer»

`(CH_3)_3C-undersetunderset(H)|OVERSET(o+)O-CH_2CH_3`
`(CH_3)_3C^+`
`CH_3-CH_2^+`
None of these

ANSWER :B
Discussion
13992.

Which of the following statement is not appropriate?

Answer»

Activated complex is short LIVED molecule
Activated complex BREAKS due to its oscillation motion.
Activated complex possesses very weak BONDS
Activated complex possesses MINIMUM POTENTIAL energy.

Answer :D
Discussion
13993.

Which of the following compound show optical isomerism?

Answer»

cis-`[CrCl_(3)(NHl_(3))_(3)]`
cis-`[CO(NH_(3))_(4)Cl_(2)]^(+)`
`[Co(en)_(3)]^(3+)`
trans-`[Co(en)_(2)Cl_(2)]^(+)`

Solution :Compound `[Co(en)_(3)]^(3+)` can show OPTICAL isomerism.
Discussion
13994.

The unused fat presents in the body is:

Answer»

Converted into carbohydrates
Removed as waste from the body
Reconverted into animal fat and STORED in different parts of the body
Easily DESTROYED by certain ENZYMES PRESENT inthe body

Answer :C
Discussion
13995.

Which of the following fractions of petroleum refining contains kerosene (Boiling ranges in .^@C are given below)

Answer»

40-80
80-200
200-300
Above 300

Answer :C
Discussion
13996.

Which of the following complex is optically inactive but its other geometrical isomer is optically active ?

Answer»

trans-tetraaquadichloridocobalt(III) nitrate
Mer-triaquatrifluoridocobalt(III)
Trans-diamminebise(ethane 1, 2 DIAMINE) COBALT(III)chloride
Trans-diamminedichloridoplatinum(II)

Solution :`CIS-[CO(en)_(2)(NH_(3))_(2)]Cl_(3)` is OPTICALLY active.
Discussion
13997.

When heated with zinc chloride, lactides forms a linear polymer which may be

Answer»

POLYSTYRENE
POLYAMIDE
Polyester
Polythene

ANSWER :A
Discussion
13998.

X+HNO_(3) to Y+NO_(2)+H_(2)O+S, Y+Ammonium molybdatetoyellow ppt. identify X:

Answer»

`As_(2)S_(5)`
`Sb_(2)S_(5)`
`SnS_(2)`
`CdS`

Solution :`As_(2)S_(5)+HNO_(3) to H_(3)AsO_(4)+NO_(2)+H_(2)O+S` (aamonium molybdate)
`H_(3)AsO_(4)+(NH_(4))_(2)MoO_(4) to `YELLOW ppt. F `(NH_(4))_(2)AsO_(4)*12MoO_(3)`
Discussion
13999.

Which of the following oxides is most alkaline in nature?

Answer»

`B_2O_3`
`Al_2O_3`
`In_2O_3`
`Tl_2O`

ANSWER :D
Discussion
14000.

Which halogen exists in liquid state at room temperature ?

Answer»

Mercury
Potassium
Sodium
Titanium

Answer :A
Discussion