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.

15051.

Which one activate the separation of Pepsin and HCl in stomach ?

Answer»

SODIUM HYDROGEN carbonate
HISTAMINE
Tranquilizers
Analgesics

Solution :Histamine
Discussion
15052.

Whatis false aboutH_(2)O_(2)

Answer»

It acts as both OXIDISING and reducing agent
Two OH BONDS lie in the same plane
It is pale blue liquid
It can be oxidised by `O_(3)`

ANSWER :B
Discussion
15053.

The volume occupied by an atom in a simple cubic unit cell is:

Answer»

`a^(3)`
`(4pia^(3))/3`
`(PIA^(3))/6`
`(SQRT(3)a)/8`

Answer :C
Discussion
15054.

Which of the following processes does not involve oxidation of iron?

Answer»

Rusting of IRON sheets
Decolourization of BLUE `CuSO_(4)` solution by iron
Formation of `Fe(CO)_(5)` from Fe
Liberation of `H_(2)` from steam by iron at high temperature

Solution :`Fe^(0) rarr 5CO rarr [Fe^(0)(CO)_(5)]`
No change in the oxidation state of iron
Discussion
15055.

Which of the following will have pyramidal shape :-

Answer»

`[ClOF_(2)]^(+)`
`I Cl_(4)^(-)`
`[BRICL]^(-)`
All of these

Answer :A
Discussion
15056.

The structure of product (X):

Answer»




ANSWER :B
Discussion
15057.

Which of the following do not give chromyl chloride test?

Answer»

`PbCl_(2)`
NaCl
NaBr
KI

Solution :`CL^(-)` ions gives chromile CHLORIDE TEST `PbCl_(2)` partially converted to `CrO_(2)Cl_(2)` does not give clear test
Discussion
15058.

Which of the following statements about the depletion of ozone layer is correct?

Answer»

The problem of ozone depletion is less serious at poles because `NO_(2)` solidifies and is not available forconsuming `CIO^(**)` radicals.
The problem of ozone depletion is more serious at poles because ice crystals in the clouds over poles act as catalyst for photochemical REACTIONS involving the decomposition of ozone of `Cl^(**) and CiO^(**)` radicals.
Freons and chlorofluorocarbons are inert. Chemically, they do not react with ozone in stratosphere.
Oxides of nitrogen also do not react with ozone in stratosphere.

Solution :Freons and CHLOROFLUOROCARBON find their way to stratosphere through without being destroyed in the troposphere due to their low reactivity. In the stratosphere the Cl and Br atoms are liberated from the parent compotmds by the action of ultraviolet light e.g.
`Cl_(2)^(-)+Cl_(2)+hv to CH_(2) Cl+Cl`
`CFCl_(3)+hv to CFCl_(2)+Cl`
TheCl atoms can destroy ozone molecules through AVARIETY of catalytic cycles.
Discussion
15059.

Which of the following mixture solution has pH ~~ 1.0 ?

Answer»

100 ML of `(M)/(10)HCl +100` ml of `(M)/(10)` NAOH
55 ml of `(M)/(10)HCl+45` ml of `(M)/(10)` NaOH
10 ml of `(M)/(10)HCl+90`ml of `(M)/(10)` NaOH
75 ml of `(M)/(5)HCl+25` ml of `(M)/(5)` NaOH.

Solution :25 ml of M/5 NaOH will NEUTRALIZE 25 ml of M/5 HCl. The remaining 50 ml of M/5 will be equal to 100 ml of M/10 HCl.
`pH=-log[H^(+)]`
`=-log 10^(-1)=1`
Discussion
15060.

Which amino acid has no asymmetric carbon:

Answer»

Histidine
Glycine
`ALPHA`-alanin
Threonin

Answer :B
Discussion
15061.

Which property is common in diamond and graphite?

Answer»

ELECTRICAL conductivity
Relative ATOMIC weight
Crystal structure
Density

Answer :B
Discussion
15062.

Write the structures of the following compounds (iv) 4-Oxopentanal

Answer»


ANSWER :`(##ANE_PKE_CHE_XII_C12_E01_004_S01##)`
Discussion
15063.

Which of the following compounds can be isolated ? If the number of isolable compounds is X than report your answer as 5X.

Answer»


SOLUTION :(a)Yes. Any sized rings can be fused cis. (b)Yes, Spirances are known for any size ring if they are able to be at right angles. ( C)No, A three and a six MEMBERED ring cannot be fused trans. The trans bonds on the Potential bridgehead C's are too FAR apart to be bridged by a single carbon BRIDGE.(d)No. As in ( c) a four and a five membered ring cannot be fused trans. (e)Yes. Two five membered (and larger ) rings can be fused trans because the trans bonds on the bridgehead C's are in position fora 3-C budge. (f) Yes. Large rings can be trans- fused
Discussion
15064.

Which vitamin contains N:

Answer»

VITAMIN A
Vitamin C
Vitamin B
Vitamin D

Answer :C
Discussion
15065.

Which are strong acid ? (P)HCIO_3 , (Q)H_2SeO_3 , (R)H_3AsO_4

Answer»

<P>P only
R only
P and R only
Q and R only

Answer :A
Discussion
15066.

When chloroform is kept open in air, a poisonous gas phosgene is formed. The molecular formula of phosgene is …….

Answer»

`PH_(3)`
`COCl_(2)`
`CH_(2)Cl_(2)`
HCOCl

Answer :B
Discussion
15067.

Xe readily forms compounds but Kr does not form compounds easily. Why?

Answer»

SOLUTION :Xe FORMS compounds more READILY than Kr because Xe has lower ionisation ENTHALPY than Kr.
Discussion
15068.

The tendency of group IV elements to form catenated compounds is greatest in case of

Answer»

C
Si
Ge
Sn.

Answer :A
Discussion
15069.

Which of the following acids forms three series of salts?

Answer»

`H_3PO_2`
`H_3BO_3`
`H_3PO_4`
`H_3PO_3`

ANSWER :C
Discussion
15070.

Whichone of thefollowingis an exampleof non-reducingsugare ?

Answer»

GLUCOSE
DEXTROSE
LACTOSE
SUCROSE

ANSWER :D
Discussion
15071.

Which one of the following is the correct decreasing order of acidity in alcohol?

Answer»

`1^@` ALCOHOL ` GT 2^@` alcohol `gt 3^@` alcohol
`3^@` alcohol `GT2^@` alcohol `gt 1^@` alcohol
`2^@` alcohol `gt 1^@` alcohol `gt 3^@` alcohol
`3^@` alcohol `gt1^@` alcohol `gt2^@` alcohol

Solution :`1^@` alcohol ` gt 2^@` alcohol `gt 3^@` alcohol
Discussion
15072.

What is the correct order of ionic size of lanthanoide ions ?

Answer»

`Lu ^(3+) GT Tb ^(3+) gt Sm ^(3+) gt La ^(3+)`
`Lu ^(3+) LT Tb ^(3+) Sm ^(3+) lt La ^(3+)`
`Lu^(3+) lt Sm ^(3+) lt Tb ^(3+) lt La ^(3+)`
`Sm ^(3+) lt Lu ^(3+) lt Tb ^(3+) lt La ^(3+)`

ANSWER :B
Discussion
15073.

Thiophene can be removed from commericial benzene vy

Answer»

Shaking it with mixture of conc. `HNO_(3)` and `H_(2)SO_(4)`
Shaking it with mixture of conc. `HNO_(3)` and `H_(2)SO_(4)`
Distillation under reduced pressure
Steam distillation

Solution :THIOPHENE can be easily sulphonated to form thiophene -2- sulphonic ACID THUS dissolves in conc. `H_(2)SO_(4)` whereas benzene does not.
Discussion
15074.

Which one of the following is not a device used to control a particulate matter

Answer»

Arresters
Scrubbers
Filters
Incinerator
Discussion
15075.

Which of the following cannotbe prepared byusingWilliamson's synthesis ?

Answer»

Methoxybenzene
BENZYL -p-nitrophenyl ether
METHYL ter-butyl ether.
DI- tertiary butyl ether.

Solution :NA
Discussion
15076.

Which of the following is obtained at lowest temperature by fractional distillation of petroleum

Answer»

KEROSENE
DIESEL oil
Gasoline
Heavy oil

Answer :C
Discussion
15077.

The reagent that can be used to distinguish between methanoic acid and ethanoci acid is

Answer»

Ammoniacal SILVER nitrate solution
Neutral FERRIC CHLORIDE solution
Sodium CARBONATE solution
Phenolphthalein

Solution :HCOOH reduces ammoniacal silvernitrate solution, i.e., Tollen's reagent but acetic ACID does not.
Discussion
15078.

Write the structure of a chalcogenide dianion.

Answer»

SOLUTION :`O^(2-), S^(2-) or SE^(2-)`, ETC.
Discussion
15079.

This section contains Reasoning Type Questions. Each question contains STATEMENT-1 (Assertion) and STATEMENT-2 (Reason). Each question has 4. choices (A), (B), (C) and (D) out of which ONLY ONE is correctQSTATEMENT-1: [Fe(H_(2)O)_(5)NO]SO_(4) is paramagnetic.and STATEMENT-2: The Fe in [Fe(H_(2)O)_(5).NO]SO_(4) has three unpaired electrons (A) STATEMENT-1 is True, STATEMENT-2 is True, STATEMENT-2 is correct explanation for STATEMENT-1 (B) STATEMENT-1 is True, STATEMENT-2 is True, STATEMENT-2 is NOT a correct explanation for STATEMENT-1 (C) STATEMENT-1 is True, STATEMENT-2 is False (D) STATEMENT-1 is False, STATEMENT-2 is True

Answer»


Solution : `[Fe(H_(2)O)_(5) NO]SO_(4)`
Here Fe has +1 oxidation state
`Fe^(+) = 3d^(6)4s^(1)`. in presence of `NO^(+) 4s^(1)` ELECTRON are paired in 3d SUB shell
So ELECTRONIC configuration of `Fe^(+)is`
Discussion
15080.

Which of the following statement are not true :

Answer»

FATS and noels are stored source of ENERGY
They provide more energy than proteins or carbohydrates
They help in ABSORBING the vitamins A and D
Fats are SOLUBLE in water

Answer :D
Discussion
15081.

Which among the following alloys is used making instruments for electrical measurnments?

Answer»

Stainless steel
MANGANIN
Spiegeleisen
Duralumin

Solution :Manganin containing `Cu(84%), Mn(12%)` and `NI(4%)` has almost zero temperature coefficient of electrical RESISTANCE and hence USED in instrument used for making electrical measurnment.
Discussion
15082.

Which of the followin reactions Is not involved in Serpeck's process of leaching of Al_(2)O_(3) from white bauxite ore?

Answer»

`Al_(2)O_(3)+N_(2)+3C overset(Delta)to 2AIN+3CO`
`SiO_(2)+N_(2)+C overset(Delta)to Si+2CO`
`Na_(2)CO_(3)+Al_(2)O_(3) overset(Delta)to 2NaAlO_(3)+CO_(2)`
`2AL(OH)_(3) oversert(Delta)to Al_(2)O_(3)+3H_(2)O`

Solution :`Na_(2)CO_(3)+Al_(2)O_(3) overset(Delta)to 2NaAlO_(2)+CO_(2)` is involved in Hall's process.
Discussion
15083.

Whichof the followingis Mendiusreaction ?

Answer»

`R-CN + 4 [H] (Na//C_(2) H_(5) OH)(to) R-CH_(2)- NH_(2)`
`RCH NOH + 4 [H] ( Na//C_(2) H_(5)OH)(to) RCH_(2) -NH_(2)`
`R-CO -NH_(2) (LiAIH_(2)//ether)/(H^(+)) R -CH_(2) NH_(2)`
`R-NO_(2) +6 [H] (Sn//Hci)(to) RNH_(2) + 2H_(2)O`

Solution :Reduction of cyanideto amineby N/Aand `C_(2) H_(5) OH` iscalledMendiusreaction
Discussion
15084.

Which one of the following is an ingredient of Pthalic acid manufacture by catalytic oxidation

Answer»

Benzene
Salicyclic ACID
Anthranilic acid
naphthalene

Solution :PHTHALIC acid MANUFACTURE from NEPTHALENE
Discussion
15085.

What are the different ways of classification of polymers ?

Answer»

Solution :(1) Classification based on source :(a) Natural polymers : Obtained from chemical substance , prepared in a laboratory or industries . E.g. Nylon , terylene , polyethene.
(c) Semisynthetic polymers : obtained from natural polymers by some chemical treatment e.g. acetate rayon, CUPRAMMONIUM silk.
(2)Classification based on structure:
(a) Linear polymer : It is made up of long continuous chain without any branches. e.g. polyethese, PVC
(b) Branched polymer : It is made up of main chain with small chains as branches of main chain e.g. polypropylene .
(c) Network or cross-linked polymers : The chain polymers linked by strong covalent bonds leads to network structure.
e.g. Bakelite, melamine.
(3) Classification based on polymerisation :
(a) Addition polymers : The addition of a LARGE number of monomers like alkenes or alkynes and the polymers are formed by chain growth polymerization .e.g. Orlon, teflon.
(b) Condensation polymers : The two monomers combine to form a polymers by elimimation of a small molecules like water oralcohol. e.g. nylons, polyesters, etc.
(4) Classification based on molecular forces:
(a) Elastomers : In these polymers , the INTERMOLECULAR forces of attraction between the polymer chains are the weakest . They have high degree fo elasticity . e.g. vulcanised rubber, Buna-S
(b) Fibres : In these polymers , the intermolecular forces of attraction between the polymer chains are the strongest . They have high TENSILE strenght . e.g. Orlon, terylene .
(c) Thermoplastic polymers : In these polymers , the intermolecular forces of attraction in the polymer chains in between those of elastomers and fibres . e.g. Polythene, polystyrene.
(d) Thermosetting polymers : These polymers are cross linked or branched molecules which do not become soft on heating under pressure, hence cannot be remoulded and recycled . e.g. Bakelite.
(5) Classification based on growth polymerisation :
(a) Chain growth polymer:Alkenes undergo growth chain polymerisation when treated with small quantity suitable initiators. e.g. polyethene, PVC.
(b) Step growth polymer : These polymers are called condesation polymers . e.g. Nylon , Bakelite.
Discussion
15086.

What will be the product, when carboxy phenol, obtained by Reimer Tiemann's process, is deoxidised with Zn powder

Answer»




SOLUTION :
Discussion
15087.

Which will exhibit optical isomerism-

Answer»

`HO-underset(H)underset(|)overset(H)overset(|)(C)-CO_(2)H`
`H_(3)C-underset(OH)underset(|)overset(H)overset(|)(C)-CO_(2)H`
`H_(3)C-underset(H)underset(|)overset(CH_(3))overset(|)(C)-COOH`
`H_(3)C-underset(CI)underset(|)overset(CH_(3))overset(|)(C)-CO_(2)H`

Solution :`H_(3)C-overset(H)overset(|)underset(OH)underset(|)(C^**)-COOH`, The central C - ATOM of the given compound is chiral. Hence, this molecule is not superimposable on its mirror image. THEREFORE, it will exhibit optical isomerism.
Discussion
15088.

Which substance is used as collector of sulphide ores in froth floatation process ?

Answer»

 Fatty ACID 
PINE oil 
Xenthate COMPOUNDS 
All (A), (B) and (C) 

ANSWER :D
Discussion
15089.

Which one of the following forms micelles in aqueous solution above certain concentration?

Answer»

Urea
Dodecyl TRIMETHYL AMMONIUM chloride
Pyridinium chloride
Glucose

Answer :B
Discussion
15090.

Write the expression for the solubility produce of Ca_3(PO_4)_2

Answer»

Solution :`Ca_3(PO_4)_2(s) leftrightarrow 3Ca^(2+) (3S)+2PO_4^(3-) (s)`
Solubility of `Ca_3(PO_4)_2` is,
`K_(sp)=[CA^(2+)]^3.[PO_4^(3-)]^2`
`K_(sp)=(3s)^3.(2s)^2`
`=(27s^2).(4s^2)`
`K_(sp)=108s^5`
Discussion
15091.

Write the chemical reactions involved in the process of extraction of Gold. Explain the role of dilute NaCN and Zn in this process.

Answer»

Solution :Gold is leached with a dilute solution of NaCN or KCN in the PRESSENCE of air (for `O_2`) from which the metal is OBTAINED later by replacement.
`4Cu (s) +8CN^(-) (aq) +2H_(2)O (aq) +O_(2)(g) to 4[Au(CN)_(2)]^(-) (aq) +4OH^(-) (aq)`
`2[Au(CN)_(2)]^(-) (aq) +Zn (s) to [Zn(CN)_(4)]^(2-) (aq) +2Au (s)`
NaCN or KCN ACTS as LEACHING agent and zinc acts as precipitating agent to precipitate gold.
Discussion
15092.

What are antihistamines ? Give example and mention its use.

Answer»

Solution :(i) Antihistamines block histamine release from histamine - 1 receptors.
(II) EG , cetirizine, terfenadine, levocetirizine .
(iii)It is used to provide RELIEF from the allergic EFFECTS .
Discussion
15093.

Which of the following reaction is a condensation reaction :

Answer»

HCHO RARR PARAFORMALDEHYDE
`CH_3CH`rarr Paraldehyde
`CH_3COCH_3` rarr Mesityl oxide
`CH_2=CH_2`rarr Polyethylene

Answer :C
Discussion
15094.

Upon heatingwithCu_ 2 S, thereagent (s) thatgivecoppermetal is /are

Answer»

` CU FeS_ 2 `
`CUO `
`Cu_2O`
` CuSO_4`

Solution :Uponheatingwith` Cu _2 S`,thereagent (s) thatgivecoppermetalis/are
(a) ` Cu FES _ 2 +Cu _2 S overset (Delta ) to`Noreaction
(b) `2 CuOoverset (Delta ) toCu_2O+1//2 O_2`
(C )`2 Cu _2 O+ Cu _2 S to6Cu+ SO_2`
(d) ` CuSO_4overset (Delta ) to Cu O+ SO_2 `
Discussion
15095.

Which of the following compounds is most basics

Answer»




ANSWER :4
Discussion
15096.

Which of the following easily undergo nucleophilic substitution by S_(N)1 mechanism in butanol?

Answer»

`C_(6)H_(5)CH_(2)Br`
`BrCH_(2)CH=CH_(2)`
`(CH_(3))_(3)CBr`
`(CH_(3))_(3)C CH_(2)Br`

Solution :All form stable carbocations. THEREFORE, all option are correct.
(a) `C_(6)H_(5)overset(+)(C)H_(2)`
(STABILIZED by RESONANCE over the phenyl ring.)
Discussion
15097.

Which of the following ores are concentrated by froth floation ?

Answer»

Haematite
Galena
COPPER pyrites
Magnetite 

Solution :PBS copper pyrite : `CuFeS_2`. Sulphide ORES are concentrated by FROTH floatation PROCESS.
Discussion
15098.

Which of the following is used as aerosol spry propellant ?

Answer»

`CHCl_(3)`
`C Cl_(4)`
`CH_(2)Cl_(2)`
`DDT`

ANSWER :C
Discussion
15099.

Which of the following statements is not true for ethane ?

Answer»

It can be chlorinated with chlorine
It can be CATALYTICALLY hydro-genated.
When oxidised it PRODUCES `CO_2` and `H_2O`.
It is homologue of iso-butane.

Answer :B
Discussion
15100.

Which one of the following compounds gives dyetest?

Answer»

Aniline
Methylamine
Diphenylamine
Ethylamine

Answer :1
Discussion