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.

89351.

(A)in creakingof akancesC-Cbondisbroken butnotC-H bond (R ) Bond energy fo c-C bondis lessthanC-Hbond .

Answer»

if both(A) and (R ) are CORRECT and ( R) is THECORRECT EXPLANATIONOF the(A)
ifboth(A) and (R ) are correct but ( R) is not thecorrectexplanationof the(A)
if (A) is correct but ( R) is INCORRECT
is (A)in incorrect but( R)is correct

Answer :A
89352.

A glycogen is

Answer»

a POLYSACCHARIDE FOUND in animals
a polysaccharide found in plants
a polysaccharide found in fruits
an enzyme

Answer :A
89353.

A glyceride is

Answer»

an ether formed by GLYCEROL
an ESTER of glycerol with fatty acids
a MOLECULAR COMPOUND of glycerol with a METAL salt
none of these

Answer :B
89354.

Identify correct statement/s from the following: (a) In diborane two BH_(2) units are linked by three bridged hydrogens. (b) It has six B-H bonds. ( c ) Diborane is used as a high energy fuel for propellent (d) It is used in welding torches

Answer»


ANSWER :a & B
89355.

(A) In brown ring test Fe^(+2) ion reduce nitrates to nitric oxide (R ) NO_(3)^(-) is stabilized by resonance

Answer»

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 :2
89356.

A glyceride is :

Answer»

A compound of glycerol with a metal
A MOLECULAR compound of glycerol with a metal salt
An ether FORMED by glycerol
An ESTER of glycerol with fatty acid

Answer :D
89357.

(A) In chemisorption , adsorption keeps on increasing with temperature (R ) Heat keeps on providing more and more activation energy

Answer»

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 :D
89358.

(A) Glucose shows mutarotation (R) Glucose is in pyranose form and has free anomeric hydroxyl group.

Answer»

Both A & R are true and R is the CORRECT EXPLANATION of A 
Both A & R are true, but R is not the correct explanation of A 
A is true, R is FALSE 
A is false, R is true 

ANSWER :A
89359.

(A) In close packing of spheres a tetrahedral void is surrounded by four spheres whereas an octahedral void is surrounded by six spheres. (R) A tetrahedral void has a tetrahedral shape whereas an octahedral void has an octa-hedral shape.

Answer»

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 :C
89360.

(A): In chemisorption the adsorbed gas layer is unimolecular thick. (R): Valence forces exist between the particles of the adsorbent and the adsorbate but not between adsorbate particles among themselves.

Answer»

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 
(A) is false but (R) is true 

ANSWER :A
89361.

(A) In any ionic solid with Schottky defects the number of positive and negative ions is same. (R) Equal number of cation and anion vacan­cies are present

Answer»

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
89362.

A glucose solution is to be injected into the blood stream. It must have the same....asthe blood stream

Answer»

molarity
vapous PRESSURE
OSMOTIC pressure
viscosity

ANSWER :C
89363.

(A): In aluminothermic process, Al reduction increases the heat of the reaction (R): During reduction in thermit process, Al_2 O_5 is formed which is an exothermic product.

Answer»

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 EXPLANATIONOF (A)
(A) is true but (R) is FALSE
Both (A) and (R) are false

Answer :A
89364.

A glow worm of mass 5.0 g emits red light (650-nm) with power of 0.10 W entirely in the backward direction. What velocity (v) in m/sec, will it have accelerated to after 10 years, if released in free space (and assumed to live). Report the answer as (v/7).

Answer»


ANSWER :3
89365.

A glassy bead formed by heating borax on a platinum wire loop is

Answer»

sodium tetraborate
sodium metaborate
sodium metabarate and BORIC anhydride
sodium tetraborate and boric anhydride

Solution :`Na_(2)B_4O_(7).10H_(2)O overset("Heat")rarrNa_(2)B_(4)O_(7)+10H_2O`
`Na_(2)B_(4)O_(7) rarr ubrace(2NaBO_2 + B_2O_3)_("Glassy bead")`
89366.

A : In alkene, hydroboration oxidation process is an example of pericyclic reaction. R : BH_(3) forms the cyclic transition state with double bond.

Answer»

If both ASSERTION & REASON are true and the reason is the correct explanation of the assertion, then mark (1).
If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
if Assertion is true STATEMENT but Reason is false, then mark (3)
If both Assertion and Reason are false statements, then mark (4)

Answer :1
89367.

A glass tumbler containing 243 cm^(3) of air at 10^(2) kpa (the barometric pressure) at 20^(@) C is turned upside down and immersed in a body of water to a depth of 20.0 m. The air in the glass is commpressed by weight above it. Calculate the volume of air in glass, assuming temperature and barometric pressure are constant .

Answer»


Solution :`P_(f) = P_(1) +` Pressure due to water column
`P_("due to water column") = dgh`
`= (1 XX 10^(-3))/(10^(-3) xx 10^(-3)) (KG)/(m^(3)) xx 9.8 xx 20.5`
`= 200.9 k Pa`
`P_(f) = (100 + 200.9) k Pa = 300.9 k Pa`
Using Boyle's Law
`P_(1)V_(1) = P_(2) V_(2)`
`V_(2) = (100 xx243)/(300.9) = 80.75 ML`
`= (80.75)/(20) = 4`
89368.

(A): In alkaline medium, KMnO_(4) oxidizes iodides to iodates. (R): KMnO_(4) behaves as stronger oxidizing agent in alkaline medium than in acidic medium.

Answer»

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

Solution : (A) is true but (R) is false
89369.

A glass tube containing molten antimony breaks upon solidification of antimony due to:

Answer»

Expansion
Exothermic reaction
Endothermic reaction
None of the above

Answer :A
89370.

(A) In a sucrose molecule, glucose is present in the furanose form and fructose is present in the pyranose form. (R) Pyranose and furanose are homocyclic ring compounds.

Answer»

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

ANSWER :B
89371.

(A): Glass possess sharp melting point. (R) : Glass is a pseudo solid

Answer»

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 
(A) is false but (R ) is true 

Answer :D
89372.

(A) In a nuclear fission process, the total mass of fragment is always greater than the mass of the original nucleus. (R ) Difference in the mass due to the fission of a heavy nucleus is converted into energy according to mass-energy conversion.

Answer»

If both (A) and (R ) are CORRECT and (R ) is the correct EXPLANATION for (A).
If both (A) and (R ) are correct but (R ) is not the correct explanation for (A )
If both (A) and (R ) are incorrect.
If both (A) and (R ) are incorrect.

Answer :D
89373.

A glass of water does not turn intoice as it reaches 0^(@)C. It is because

Answer»

water does not SOLIDIFY at `0^(@)C`
a certain amount of HEAT must be supplied to the glass of water so as to solidify
a certain amount of heat must be TAKEN out from the glass of water so as to solidify
water SOLIDIFIES at 0 K only

Solution :It is because a certain amount of heat must be taken out of glass so as to solidify.
89374.

(A) In a multiple reaction, the rate determining step is the fast step. (R ) In multistep reaction order for each step can be defined.

Answer»

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 :D
89375.

(A) Glass is an amorphous solid (R) Glass has an irregular, random arrange­ment of atoms.

Answer»

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
89376.

A) In a group the correct order of melting points is 3dlt4dlt5d B) VI B group have highest melting points in any series C) In 3d and 4d series, VIIB group elements have exceptionally low melting points D) The correct order of melting points is CugtAggtAu

Answer»

Only A, B, C are CORRECT
Only A, B, D are correct
Only B, C, D are correct
Only A, D, C are correct

ANSWER :A
89377.

A glass contains 36 ml of liquid water (density =1 gm/ml). Find (i) Moles of H_(2)Ob (ii) Number of H_(2)O molecules (iii) Number of H-atoms

Answer»


Answer :`(##ALN_NC_CHM_MC_E01_007_A01##)`
(i) 2 MOLE(ii) `2 xx N_(A)` (iii) ` 4XX N_(A)`
89378.

(a) Illustratethe followingreactionsgiving a suitable example for each. (i) Cross aldol condensation (ii) Decarboxylation (b) Give simple tests to distinguish between the following pairs of compound (i) Pentan-2-one and pentan-3-one (ii) Benzaldehyde and Acetophenone (ii) Phenol and Benzoic acid

Answer»

Solution :(i) Cross aldol condensation: Whenaldol condensationis carried out between two different aldehyde and ketones,it is called acdol condensation. Ketones can alsobe used as one compound in cross aldol reactions.
`CH_(3)CHO+CH_(3)CH_(2)CHOoverset(1.NaOH)underset(2.NaOH)rarrunderset("But-2-enal")(CH_(3)-CH)=CHCHO+underset("2-methyl pent-2-enal")(CH_(3)CH_(2)=overset(CH_(3))overset(|)(C)-CHO`
From two moleculesfrom two molecules of ETHANOL of propanal
`underset("2-methulbut-2-enal")(CH_(3)-CH=underset(CH_(3))underset(|)(C)-CHO)+underset("Pent-2-enal")(CH_(3)CH_(2)-CH)=CHCHO`
from one molecules of ETHANAL and one molecules of propanal
(II) Decarboxylation : Carboxylic acid lose carbon dioxide to form hydrocarbons whe their sodium salt are heated with sodiumsalts are heatedwith sodaline. The reaction is known as decarboxylation.
`R-COONaunderset("Heat")overset(NaOH & CaO)rarr R-H + Na_(2)CO_(3)`
`2CH_(2)COONa(aq) + 2H_(2)O overset("electrolysis")rarr CH_(3)CH_(3)+2CO+2BNaOH+H_(2)`
(b) (i) `CH_(3)-overset(O)overset(||)(C)-CH_(2)CH_(2)-CH_(3)`gives yellow percipitate of Iodoform withNaOH with `NaOH` and iodine.
`H_(3)C-CH_(2)-overset(O)overset(||)(C)-underset("Pentane-3-one")(CH_(2)-CH)` does not give yellow ppt.
(ii)
Give yellow precipitate of iodoform with `NaOH` and iodine.
(iii) Benzoic acid decomposes `NaHCO_(3)`.
`C_(6)H_(5)COOH + NaHCO_(3) rarr C_(6)H_(5)COONa+CO_(2) +H_(2)O`
`C_(6)H_(5)COH+NaHCO_(3)rarr "No reaction "`.
89379.

A glass bulb is coninected to an open limb manometer. The level of mercury in both limbs of the manometer was same. The bulb was heated to 57^(@)C. If the room temperature and the atmospheric pressure were 27^(@)C and 750 mm, the difference of levels in the two limbs now will be:

Answer»

2.5 cm
5.0 cm
7.5 cm
10.0 cm

Answer :C
89380.

Identify the correct statements (a) In a group the correct order of melting points is 3d < 4d < 5d (b) In 3d and 4d series, VII B group elements have exceptionally low melting points (c) II B group have highest melting points in any series. (d) The correct order of melting points is Cu > Ag > Au

Answer»

Only A, B, C are CORRECT
Only A, B, D are correct
Only B, C, D are correct
Only A, D, C are correct

Answer :A
89381.

A given solution of H_2O_2 is 30 volume. Its concentration in terms of molarity is:

Answer»

9.1 M
2.68 M
2.5 M
26.8 M

Answer :B
89382.

(a) Illustrate graphically the effect of catalyston activation energy. (b) Catalysts have no effect on the equilibrium constant. Why ? ( c ) The decomposition of A into product has value of k as 4.5xx10^(3)s^(-1)" at "10^(@)C and activation energy is 60" kJ mol"^(-1). Calculate the temperature at which the value of k will be 1.5xx10^(4)s^(-1).

Answer»

SOLUTION :`["( C ) "24^(@)C]`
89383.

A given surface of an adsorbent does not show any preference for a particular gas as ____________ are universal.

Answer»

SOLUTION :VAN DER Waal.s FORCES
89384.

(a) Illustrate graphically the effect of catalyst on activation energy. (b) Catalysts have no effect on the equilibrium constant. Why? (c ) The decomposition of A into product has value of k as 4.5xx10^(3)s^(-1) at 10^(@)C and activation energyis 60 kJ mol^(-1). Calculate the temperature at which the value of kW(J) be 1.5xx10^(4)s^(-1).

Answer»

Solution :(a) The catalyst provides an alternate pathways or reaction mechanism by reducing the activation energy between the reactants and products and hence lowering the potential energy barrier as shown in the figure.

(b) A catalyst does not change the equilibrium constant of a reaction, rather it helps in attaining the equilibrium faster. That is, it catalysesthe forward as well as backward REACTIONS to the same extent so that the equilibrium state remains same but is REACHED earlier.
(C ) Use the relation
Given : `"log"(k_(2))/(k_(1))=(E_(a))/(2.303R)[(T_(2)-T_(1))/(T_(1)T_(2))]`
`k_(1)=4.5xx 10^(3)s^(-1), k_(2)=1.5xx10^(4)s^(-1), T_(1)=10^(@)C=283K, T_(2)=?, E_(a)=60 kJ=60000J`
`R=8.314JK^(-1)"MOL"^(-1)`
SUBSTITUTING the values in the equation above, we have
`"log"(1.5xx10^(4))/(4.5xx10^(3))=(60000)/(2.303xx8.314)[(T_(2)-283)/(283T_(2))] or 0.5228=3133.6269[(T_(2)-283)/(283T_(2))]`
or `(T_(2)-283)/(283T_(2))=(0.5228)/(3133.6269) or (T_(2)-283)/(283T_(2))=0.00016684`
or `T_(2)-283=0.0472T_(2) or T_(2)(1-0.0472)=283`
or `0.9528T_(2)=283`
or `T_(2)=283//0.9528=297K or 24^(@)C`
89385.

(A) IF_(7) is the highest numbered inter halogen compound (R ) Radius ratio between I and F in IF_(7) is minimum

Answer»

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 :C
89386.

A given sample of milk turns sour at room temperature (27^(@)C) in 5 hours. In a refrigerator at -3^(@)C, it can be stored 10 times longer. Calculate the energy of activation of souring of milk.

Answer»

Solution :`T_(1)=27+273=300" K",T_(2)=273-3=270" K"`
`k_(2)=k,""k_(1)=10" k (Higher the temperature, greater is the VALUE of k)"`
`LOG""(k_(2))/(k_(1))=(E_(a))/(2.303" R")((1)/(T_(1))-(1)/(T_(2)))`
or `log""(1)/(10)=(E_(a))/(2.303" R")((1)/(300)-(1)/(270))`
`-1=(E__(a))/(2.303" R")((-30)/(300xx270))" or "E_(a)=2.303" R"xx2700" J mol"^(-1)=2.303xx8.314xx2700" J mol"^(-1)`
`=51697" J mol"^(-1)=51.7" kJ mol"^(-1)`
89387.

(A) If the activation energy of a reaction is zero, temperature has no effect on the rate constant. (R ) Lower the activation energy, faster is the reaction.

Answer»

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 :B
89388.

A given sample of AlCl_3contains 6.02 xx 10^20Al^(3+)ions. The moles of Cl^(-1)ions are :

Answer»

`1.0 xx 10^(-3)`
`3.0 xx 10^(-3)`
`3.0 xx 10^3`
`0.33 xx 10^(-3)`

SOLUTION :No. of `CL^(-)` IONS = ` 3 xx 6.02 xx 10^20`
Moles of `Cl^(-)` ions
` = (3 xx 6.02 xx 10^20)/(6.02 xx 10^23) = 3 xx 10^(-3)`
89389.

(A) If standard reduction potential for the reaction, Ag^(+)+e^(-) rarr Ag is 0.80 volt, then for the reaction, 2Ag^(+)+2e^(-) rarr 2Ag, it will be 1.60 volt. (R) If concentration of Ag^(+) ions is doubled, the electrode potential is also doubled.

Answer»

If both (A) and (R) are CORRECT, and (R) is the correct EXPLANATION of (A).
If both (A) and (R) are correct, but (R) is not the correct explanation of (A).
If (A) is correct, but (R) is INCORRECT
If (A) is incorrect, but (R) is correct.

Answer :D
89390.

A given sample of milk turns sour at room temperature (27^(@)C) in 5 hours . In a refrigerator at -3 ^(@)C , it can be stored 10 times longer . The energy of activation for the souring of milk is

Answer»

`2.303 XX 10 R KJ MOL^(-1)`
`2.303 xx 5 R kJ mol^(-1)`
`2.303 xx 3 R kJ mol^(-1)`
`2.303 xx 2.7 R kJ mol^(-1)`

Answer :d
89391.

(A ) If in a zero order reaction, the concentration of the reactant is doubled, the half-life period is also doubled. (R ) For a zero order reaction, the rate of reaction is independent of initial concentration.

Answer»

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 :B
89392.

(A) : If E^(0) " of " Cu^(2+)//Cu=+0.34V and E^(0) " of "Ag^(+) // Ag = + 0.80 Vthen galvanic cell constructed from these is Ag//Ag^(+) // // Cu^(2+ ) // Cu (R) : In any galvanic cell the reaction that takes place is a redox reaction Electrode potentials & EMF

Answer»

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
(A) is false but (R) is true

Answer :D
89393.

A given sample of milk turns sour at room temperature (20^(@) C) in 64 hour. In a refrigerator at 3^(@)C, milk can be stored three times as long before it sours. Estimate: (a) The activation energy for souring of milk, (b) How long it take milk to sour at 40^(@)C?

Answer»


SOLUTION :N//A
89394.

(a) If E^@ (Ag^(+)//Ag) = 0.8 V and E^@ (H^(+)//H_2) = 0 V, in a cell arrangement using these two electrodes, which will act as anode cathode ? Also find the E^@ of the cell. (b) Construct a cell using given electrodes at 25^@C. Find its standard EMF. E^@ (Zn^(2+)//Zn) = – 0.76 V and E^@ (Cu^(2+)//Cu) = 0.338 V

Answer»


ANSWER :1.098 V
89395.

A given sample of milk turns sour at room temperature (27^(@) C) in 5 hours . In a refrigerator at -3^(@) C , it can be stored 10 times longer . The energy of activation for the souring of milk is

Answer»

`2.303 xx 10 R kJ * mol^(-1)`
`2.303 xx 5 R kJ* mol^(-1)`
`2.303 xx 3 R kJ * mol^(-1)`
`2.303 xx 2.7 R kJ* mol^(-1)`

SOLUTION :RATE of souring of milk at `27^(@)C` is 10 times faster than at `-3^(@) C` .
HENCE , `(k_(300))/(k_(270)) = 10 , T_(1) = 270 K , T_(2) = 300 K`
`E_(a) = 2.303 R ((T_(1) T_(2))/(T_(2) - T_(1))) LOG (k_(300))/(k_(270))`
`E_(a) = 2.303 R ((270 xx 300)/(300 - 270)) log 10`
`E_(a) = 2.303 R (2. 7 xx 10^(3)) J mol^(-1)`
`E_(a) = 2.303 xx 2.7 R kJ mol^(-1)`
89396.

(a) If both the assertion and reason are true and reason is a true explanation of the assertion. (b) If both the assertion and reason are true but the reason is not the correct explanation of assertion. (c) If the assertion is true but reason is false. (d) If assertion is false but reason is true. Q. Assertion: Aniline hydrogen sulphate on heating forms a mixture of o-and p-amino suphonic acid. Reason: The sulphonic acid is overlineepsi withdrawing.

Answer»


SOLUTION :CORRECT explanation:
Aniline hydrogen sulphate on heating decomposes to aniline and `H_2SO_4` Sulphonation of aniline with `H_2SO_4` TAKES PALCE (SE reaction) at o- and p-position since `(-NH_2)` group is o-and p-directing.
89397.

A given nitrogen-containing aromatic compound A reacts with Sn//HCl, followed by HNO_(2) to give an unstable compound B . B on treatment with phenol,forms a beautiful coloured compound C with the molecular formulaC_(12)H_(10)N_(2)O. The structure of compound A is

Answer»




SOLUTION :
89398.

A given nitrogen-containing aromatic compound A reacts with Sn/HCI, followed by HNO_(2) to give an unstable compound B. B, on treatment with phenol, forms a beautiful coloured compound C with the molecular formula C_(12)H_(10)N_(2)O. The structure of compound A is

Answer»




ANSWER :2
89399.

(a) If both the assertion and reason are true and reason is a true explanation of the assertion. (b) If both the assertion and reason are true but the reason is not the correct explanation of assertion. (c) If the assertion is true but reason is false. (d) If assertion is false but reason is true. Q. Assertion: Anilinium chloride is more acidic than ammonium chloride. Reason: Anilinium chloride is resonance stabilised.

Answer»


Solution :
Aniline is WEAKER BASE than ammonium chloride. In `NH_4Cl` or aliphatic amines, the non-bonding electron pair of N is localized and is fully available for coordination with a proton.
`CH_6H_5NH_3^(C+)toC_6H_5NH_2+H^(+)`
On the other hand, in aniline and other AROMATIC amines, the non-bonding electron pair is delocalised into benzene ring by resonance.
But anilinium ion is LESS resonance stabilised than aniline.
89400.

A given nitrogen-containing compound A reacts with Sn//HCI followed by HNO_(2) to give an unstable compund B.B on treatment with pheno1 forms a beautiful coloured compound C with the molecular formula C_(12)H_(10)N_(2)O The structure of compound A is .

Answer»

ANSWER :C