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.
| 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: |
|
Answer» `2.15` s |
|
| 85452. |
Acid catalyzed hydration ofalkenes except ethene leads to the formation of |
|
Answer» MIXTURE of SECONDARY and TERTIARY alcohols
|
|
| 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: |
|
Answer» `2.5` BAR |
|
| 85454. |
Acid catalyzed hydration of alkenes except ethene leads to the formation of |
|
Answer» PRIMARY alcohol |
|
| 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 |
|
Answer» <P>1.15 atm 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 |
|
Answer» carbanion. |
|
| 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 : |
|
Answer» 1.5 |
|
| 85458. |
Ag' obtained from angenerous leadis purified by |
|
Answer» Distillation |
|
| 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 |
|
Answer» 1.5 |
|
| 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 |
|
Answer» 1.5 |
|
| 85461. |
Acid catalyzed hydration of alkenes except ethane leads to the formation of |
|
Answer» Electrophilic ADDITION and intermediate is CARBANION |
|
| 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 |
|
Answer» `1.08xx10^(-7)` `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 |
|
Answer» ELECTROPHILIC addition and INTERMEDIATE is CARBANION |
|
| 85464. |
Acid catalysed hydration of alkenes except ethene leads to the formation of |
|
Answer» secondary or TERTIARY alcohol |
|
| 85465. |
Acid catalysed hydration, hydroboration - oxidation, and oxymercuration - demercuration will give different products in |
|
Answer»
|
|
| 85466. |
Acid-catalysed dehydration of t-butanol is faster than that of n-butanol. Give reasons in one or two sentences. |
|
Answer» 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»
|
|
| 85468. |
Acid anhydrides on reaction with primary amines give |
|
Answer» amide |
|
| 85470. |
Acid anhydrides on reaction with primary amine gives… |
|
Answer» amide |
|
| 85471. |
Acid anhydrides on reaction with primary amines give_____ |
|
Answer» amide |
|
| 85472. |
Acitic anhydride reacts with ammonia to give : |
|
Answer» ACETAMIDE |
|
| 85473. |
Acid anhydrides on reaction with primary amines give: |
| Answer» Answer :C | |
| 85474. |
Acid anhydride on reaction with 1^@ amine gives |
|
Answer» amide |
|
| 85475. |
Acid anhydride can be prepared by : |
|
Answer» `C_(6)H_(5)COOH+CH_(3)COCloverset("PYRIDINE")rarr` |
|
| 85476. |
Acid amides are generally amphoteric in nature. Justify this statement. |
|
Answer» 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. |
|
Answer» |
|
| 85478. |
Aci form of nitro alkanes are otherwise called………………….. Or ……………………… |
|
Answer» |
|
| 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 ? |
|
Answer» 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. |
|
Answer» Both (A) and (R ) are TRUE and (R ) is the correct explanation of (A) |
|
| 85481. |
Acetylenic hydrogen are acidic because |
|
Answer» Sima electron density of C-H Bond in acetylene is nearer to carbon, which has 50% s character |
|
| 85482. |
Ag is extracted by |
|
Answer» Capellation method |
|
| 85483. |
Acetylene when oxidized with chromic acid gives |
|
Answer» ETHYLENE glycol |
|
| 85484. |
Acetylene when passed through 20% H_(2)SO_(4) at 80^(@)C gives acetaldehyde. The catalyst required for the conversion is : |
|
Answer» anhydrous `AlCl_(3)` |
|
| 85485. |
Acetylene when oxidised with alk. KMnO_(4) gives : |
|
Answer» Oxalic ACID |
|
| 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. |
| Answer» SOLUTION :`2.88 XX 10^(-4) CM` | |
| 85487. |
Acetylene to acetaldehyde |
|
Answer» 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: |
|
Answer» VINYL cyanide |
|
| 85489. |
Ag^(+) ion is isoelectronic with |
|
Answer» `Cu^(+)` |
|
| 85490. |
Acetylene reacts with ammoniacal cuprous chloride to from : |
|
Answer» `CuH_2` |
|
| 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 |
|
Answer» In these complexes, `Ag^(+)` is a LEWIS base |
|
| 85492. |
Acetylene reacts with ammoniacal AgNO_3 forming |
|
Answer» SILVER acetylene |
|
| 85493. |
What happens when acetylene is passed through ammoniacal silver nitrate solution ? |
|
Answer» SILVER mirror |
|
| 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)) |
|
Answer» `=- 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: |
|
Answer» `C_2H_5HSO_4` |
|
| 85496. |
Acetylene produced by the action of water on calcium carbide generally has foul smell due to |
|
Answer» its CHARACTERISTIC smell |
|
| 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 : |
|
Answer» `0.08` `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 : |
|
Answer» ACETICACID |
|
| 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 ? |
| Answer» ANSWER :B | |
| 85500. |
Acetylene on reaction with hypochlorous acid gives |
|
Answer» ACETONE |
|