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85451.

A(g) rarr 2B(g)+C(g) Initially at t=0 gas Awas present with some amount of gas 'C' At t=0 mole fraction of gas C is 1/3 After some time t=t_(1) total pressure is half of the final total pressure at t=t_(x) (a very long time) Assume this decomposition is a first order, at a constant temperature It is also given at t=t_(x) final total pressure is 35 bar. Rate constant (k)=(log 64-log 49)s^(-1) values of t_(1) in second is:

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`2.15` s
`1.5` s
`2.3` s
`1.15` s

Answer :D
85452.

Acid catalyzed hydration ofalkenes except ethene leads to the formation of

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MIXTURE of SECONDARY and TERTIARY alcohols
mixture of PRIMARY and secondary alcohols
secondary or tertiary alcohol
prirnaryalcohol

Solution :
85453.

A(g) rarr 2B(g)+C(g) Initially at t=0 gas Awas present with some amount of gas 'C' At t=0 mole fraction of gas C is 1/3 After some time t=t_(1) total pressure is half of the final total pressure at t=t_(x) (a very long time) Assume this decomposition is a first order, at a constant temperature It is also given at t=t_(x) final total pressure is 35 bar. At t=t_(1) pressure of gas B is:

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`2.5` BAR
`1.25` bar
`5.0` bar
data is insufficient

Answer :A
85454.

Acid catalyzed hydration of alkenes except ethene leads to the formation of

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PRIMARY alcohol
SECONDARY and TERTIARY alcohol
Mixture of primary and secondary alcohols
Mixture of secondary and tertiary alcohols

Answer :B
85455.

A_((g)) overset(Delta)to P_((g)) + "Q"_((g)) + R_((g)) , follows first order kinetics with a half life of 69.3 s at 500^(@) C. Startingfrom the gas ‘A’ enclosed in a container at 500^(@) C and at a pressure of 0.4 atm, the total pressure of the system after 230 s will be

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<P>1.15 atm
1.32 atm
1.22 atm
1.12 atm

Solution :`(230)/(69.3) = 3.33 ` HALF lives
90% COMPLETION
`underset(1-0.9)(A_((g))) implies underset(0.9)(P_((g))) + underset(0.9)(Q_((g))) + underset((0.9))(R_((g))) = 0.1`
Total PRESSURE = 0.1 + 0.9 + 0.9 + 0.9 = 2.8
` 1-0.4`
`2.8 - ?`
` 2.8 xx 0.4 = 1.12 atm`
85456.

Acid catalyzed aldol condensation involves

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carbanion.
ENOLATE ION.
ENOL.
both (a) and (b)

Answer :C
85457.

Acid catalysed hydrolysis of ethyl acetate follows a pseudo-first order kinetics with respect to ester . If the reaction is carried out with large excess of ester , the order with respect to ester will be :

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1.5
0
2
1

Answer :B
85458.

Ag' obtained from angenerous leadis purified by

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Distillation
FORTH floatation
Cupellation
Reaction with KCN

Solution :AG can be PURIFIED by Cupellation
85459.

Acid catalysed hydrolysis of ethyl acetate follows a pseudo-first order kinetics with respect to ester. If the reaction is carried out with large excess of ester, the order with respect to ester will be

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1.5
0
2
1

Solution :With large EXCESS of ester the RATE of REACTION is INDEPENDENT of ester concentration.
85460.

Acid catalysed hydrolysis of ethyl acetate follows a pseudo-first order kinetics with respect to ester . If the reaction is carried out with large excess of ester , the order with respect to ester will be

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1.5
0
2
1

Solution :With LARGE excess of ESTER the RATE of REACTION is independent of ester concentration .
85461.

Acid catalyzed hydration of alkenes except ethane leads to the formation of

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Electrophilic ADDITION and intermediate is CARBANION
Electrophilic addition and intermediate is CARBONIUM ION
Nucleophilic addition and intermediate is carbonium ion
Freeradical addition

Answer :B
85462.

Ag^(+)+NH_(3)iff[Ag(NH_(3))]^(+),k_(1)=6.8xx10^(-3) [Ag(NH_(3))]^(+)+NH_(3)iff[Ag(NH_(3))_(2)]^(+),k_(2)=1.6xx10^(-3)then the formation constant of [Ag(NH_(3))_(2)]^(+) is

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`1.08xx10^(-7)`
`1.08xx10^(-5)`
`1.08xx10^(-9)`
none of these

Solution :As the REACTION TAKES placein two steps.
`beta=beta_(1)xxbeta_(2)=(6.8xx10^(-3))XX(1.6xx10^(-3))=10.8xx10^(-6)=1.08xx10^(-5)`
85463.

Acid catalysed hydration of alkenes is

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ELECTROPHILIC addition and INTERMEDIATE is CARBANION
Electrophilic addition and intermediate is carbonium ION
Nucleophilic addition and intermediate is carbonium ion
Freeradical addition

Answer :B
85464.

Acid catalysed hydration of alkenes except ethene leads to the formation of

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secondary or TERTIARY alcohol
PRIMARY alcohol
MIXTURE of secondary and tertiary of ALCOHOLS
mixture of primary and secondary alcohols

Answer :A
85465.

Acid catalysed hydration, hydroboration - oxidation, and oxymercuration - demercuration will give different products in

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ANSWER :D
85466.

Acid-catalysed dehydration of t-butanol is faster than that of n-butanol. Give reasons in one or two sentences.

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Solution :Acid-catalysed dehydration of alcohols occurs through the INTERMEDIATE FORMATION of carbocations.
`underset("t-Butanol")(CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-OH) underset(-H_(2)O)overset(+H^(+))to underset("t-Butyl CARBOCATION (more stable)")(CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C^(+)),underset("n-Butanol")(CH_(3)CH_(2)CH_(2)CH_(2)-OH) underset(-H_(2)O)overset(+H^(+))to underset("n-Butyl carbocation (less stable)")(CH_(3)CH_(2)CH_(2)overset(+)(C)H_(2))`
Since t-butyl carbocation is more stable than n-butyl carbocation, therefore, acid-catalysed dehydration of t-butanol occurs fater than n-butanol.
85467.

Acid catalysed conversion of 1,2-diol or vicinal diol, into carbonyl compound known as pinacol-pinacolone rearrangement. Generally more electron donating group migrate during mechanism, migration of –H is faster because of its smaller size. In this sequence of reaction final product is

Answer»




ANSWER :D
85468.

Acid anhydrides on reaction with primary amines give

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amide
imide
SECONDARY amine
imine

Solution :AMIDES are FORMED :`(RCO)_2 O+RNH_2 to RCONH_2+RCOOH`
85469.

[Ag (NH_3)_2] NO_3 is formula of _____.

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SOLUTION :AMINE COMPLEX of SILVER
85470.

Acid anhydrides on reaction with primary amine gives…

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amide
imide
SECONDARY amine
imine

Solution :AMIDES are FORMED :`(RCO)_2 O+RNH_2 to RCONH_2+RCOOH`
85471.

Acid anhydrides on reaction with primary amines give_____

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amide
imide
secondary amide
imine

Solution :AMIDES are FORMED: `(RCHO)_(2)O+RNH_(2) to RCONH_(2)+RCOOH`
85472.

Acitic anhydride reacts with ammonia to give :

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ACETAMIDE
Formamide
Ethyl AMINE
METHYL amine

ANSWER :A
85473.

Acid anhydrides on reaction with primary amines give:

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IMINE
`2^@` AMINE
AMIDE
imide

Answer :C
85474.

Acid anhydride on reaction with 1^@ amine gives

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amide
imide
imine
None of the above

Answer :A
85475.

Acid anhydride can be prepared by :

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`C_(6)H_(5)COOH+CH_(3)COCloverset("PYRIDINE")rarr`
`C_(6)H_(5)COO^(Theta)NA^(OPLUS)+C_(6)H_(5)COClrarr`
`C_(6)H_(5)CONH_(2)+CH_(3)COO^(Theta)Na^(oplus)rarr`

Answer :A::B::D
85476.

Acid amides are generally amphoteric in nature. Justify this statement.

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Solution :(i) Amides behave both as weak acid as WELL as weak base and thus show amphoteric character.
This can be proved by the following reactions.
(ii) Acetamide (as base) reacts with hydrochloric acid to form salt
`underset("acetamide")(CH_3 -C - NH_2) + HCl to underset("acetamide hydrochloride")(CH_3 - undersetoverset(||)(O)(C ) -NH_3^(+) Cl^(-) ) `
(III) Acetamide ( as acid ) reacts with sodium to form sodium saltand hydrogen gas is liberated .
`underset("acetamide")(2CH_3 - undersetoverset(||)(O)(C ) - NH_2 + 2Na) to underset("sodium acetamide")(2CH_3 - undersetoverset(||)(O)(C ) - NH.Na + H_2 UARR `
85477.

Aci form of nitro alkanes gives ………………… colour with ferric chloride.

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ANSWER :REDDISH BROWN
85478.

Aci form of nitro alkanes are otherwise called………………….. Or ………………………

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ANSWER :PSEUDO ACIDS (or) Nitronic acids
85479.

Ag^(+) + NH_3 hArr [Ag(NH_3)]^(+), K_1=3.5xx10^(-3) , [Ag(NH_3)]^(+) + NH_3 hArr [Ag(NH_3)_2]^(+) , K_2=1.7xx10^(-3) . Calculate the formation constant of [Ag(NH_3)_2]^+. What is the instability constant ?

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Solution :Overall formation constant is the PRODUCT of successive formation constants, `K_c=K_1xxK_2`.
Formation constant of `[AG(NH_3)_2]^(+) =3.5xx10^(-3)xx1.7xx10^(-3)=5.95xx10^(-6)`
Instability constant is the inverse of the STABILITY constant, `1/K_c=1/(5.95xx10^(-6))=1.7xx10^7`.
85480.

(A)Charcoal is a good adsorbent (R ) Charcoal has highly porous structure.

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Both (A) and (R ) are TRUE and (R ) is the correct explanation of (A)
Both (A)and (R ) are true and (R ) is not the correct explanation of (A)
(A) is true but (R ) is FALSE
Both (A) and (R ) are false

ANSWER :A
85481.

Acetylenic hydrogen are acidic because

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Sima electron density of C-H Bond in acetylene is nearer to carbon, which has 50% s character
Acetylene has only one hydrogen on each carbon
Acetylene contains least NUMBER of hydrogen AMONG the possible hydrocarbons having TWO carbons
Acetylene BELONGS to the CLASS of alkynes with molecular formula `C_nH_(2n-2)`

Answer :A
85482.

Ag is extracted by

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Capellation method
Parke's PROCESS
Pattinson's process
None of these

Solution :By using cupellation, Parke.s process and pattinsons process AG can be EXTRACTED these three processes can be used for the removing Ag from PB.
85483.

Acetylene when oxidized with chromic acid gives

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ETHYLENE glycol
Oxalic acid
Formic acid
Acetic acid

Answer :4
85484.

Acetylene when passed through 20% H_(2)SO_(4) at 80^(@)C gives acetaldehyde. The catalyst required for the conversion is :

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anhydrous `AlCl_(3)`
`HgSO_(4)`
Pb
PT

Answer :B
85485.

Acetylene when oxidised with alk. KMnO_(4) gives :

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Oxalic ACID
ethylene glycol
Glycerol
ACETIC acid

Solution :`{:(CH,,COOH),(|||,+ 4O OVERSET(alk.KMnO_(4))rarr,"|"),(CH,,underset("Oxalic acid")(COOH)):}`
85486.

Ag is electrodeposited on a metallic vessel of surface area 800 cm^(2) by passing a current of 0.2 amp for three hours. Calculate the thickness of silver deposited, given its density is 10.47 g/cc.

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SOLUTION :`2.88 XX 10^(-4) CM`
85487.

Acetylene to acetaldehyde

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Solution :Acetylene to acetaldehyde :
`underset("acetylene")({:(CH+H_(2)O),("|||"),(CH):}) OVERSET(40% H_(2)SO_(4))underset(1% HgSO_(4))RARR underset("VINYL alcohol ")(({:(CH-OH),("||"),(CH_(2)):})) overset("TAUTOMERISATION")rarr underset("acetaldehyde")(CH_(3)-overset(H)overset(|)(C )=O)`
85488.

Acetylene reacts with HCN in the presence of Ba(CN)_2 to yield:

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VINYL cyanide
1,1-dicyanoethane
1,2-dichloroethene
None of these

Answer :B
85489.

Ag^(+) ion is isoelectronic with

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`Cu^(+)`
`AU^(3+)`
`Zn^(3+)`
`Cd^(2+)`.

SOLUTION :`Ag^(+)` (47): [kr] `4d^(10) and Cd^(2+)` (48): [Kr] `4d^(10)` have same electronic CONFIGURATION.
85490.

Acetylene reacts with ammoniacal cuprous chloride to from :

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`CuH_2`
`Cu_2H_2`
`Cu_2C_2`
`H_2CuCl`

ANSWER :C
85491.

Ag^(+) forms many complexes, some of these are [Ag(NH_(3))_(2)]^(+) [Ag(CN)_(2)]^(-). [Ag(S_(2)O_(3))_(2)]^(3-) Which of the following statements is true

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In these complexes, `Ag^(+)` is a LEWIS base
The HYBRIDIZATION of `Ag^(+)` is sp^(2)`
The `Ag^(+) complexes are good reducing AGENTS
 These complexes are all linear.

Answer :D
85492.

Acetylene reacts with ammoniacal AgNO_3 forming

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SILVER acetylene
Silver ACETATE
METAL silver
Silver MIRROR

ANSWER :A
85493.

What happens when acetylene is passed through ammoniacal silver nitrate solution ?

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SILVER mirror
metallic silver
silver acetate
silver acetylide

Answer :D
85494.

Ag// AgBr(s) , underset(0.1M)(KBr)// underset(0.1M)(KCl), underset((3))(AgCl)//Ag the cell potential is 0.1x volts. What is x ? (Ksp AgBr = 10^(-16), AgCl= 10^(-11))

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Solution :`E = -(0.0591)/(1) log""(K_(sp) AgBr//0.1)/(K_(sp AgCl)//0.1) = -0.0591 XX log""((10^(-16))/(10^(-11)))`
`=- 0.0591 xx log(10^(-1)) = -0.0591 xx (-5) = + 0.2955 V = + 0.3V = 0.1 x ,x=3 `
85495.

Acetylene reacts with 42% H_2SO_4 containing 1% HgSO_4 to give:

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`C_2H_5HSO_4`
`CH_3CHO`
HCHO
`CH_2=CH_2`

ANSWER :B
85496.

Acetylene produced by the action of water on calcium carbide generally has foul smell due to

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its CHARACTERISTIC smell
IMPURITIES of `PH_3` and `H_2S`
impurities of `SO_2` and `SO_3`
impurities of `NH_3` and `SO_2`.

ANSWER :B
85497.

A(g) + 3B(g) rarr 4C(g)Initially concentration of A is equal to that of B. The equilibrium concentrations of A and C are equal. Kc is :

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`0.08`
`0.8`
8
80

Solution :`{:(A,+,3B,hArr,4C),(a,,b,,0),((a-x),,(b-3x),,4X):}`
`K_(c)=([C]^(4))/([A][B]^(3))=(4x.4x.4x.4x)/((a-x)(b-3x))`
Given `a=b,a-x=4ximpliesa=5x=b`
`K_(c)=(4x.4x.4x.4x.)/((5x-x)(5x-3x))=(4x.4x.4x.4x)/(4x2x.2x2x)=8.`
85498.

Acetylene on treatmentwith ozonefollowed bytreatmentwithwater gives :

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ACETICACID
GLYCOL
glyoxal
glycerol

ANSWER :C
85499.

A(g) + B(g) ⇌ AB(g) is areversible reaction. At equilibrium 0.4 mole of AB is formed whn each A and B are tsken on emole. How much of A change into AB ?

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`20%`
`40%`
`60%`
`4%`

ANSWER :B
85500.

Acetylene on reaction with hypochlorous acid gives

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ACETONE
Chloro acetone
DICHLORO acetaldehyde
Dichloro METHANE

ANSWER :C