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.

751.

The reciprocal of the specific reistance is called the ............... And represented by symbol

Answer»

SOLUTION :SPECIFIC CONDUCTANCE, KAPPA(K)
Discussion
752.

Which of thefolowing show deviation from raoult's law .

Answer»

`C_(2)H_(5)OH & H_(2)O`
`HNO_(3) & H_(2)O`
`CHCl_(3) & CH_(3)COCH_(3)`
`C_(6)H_(6) & C_(6)H_(5)CH_(3)`

Answer :A::B::C
Discussion
753.

What is meant by carbon reduction and electrolytic reduction with examples? What is the role of flux in the metallurgical operation? Name one mineral that can be used as a flux and describe its working.

Answer»

CAO
`SiO_2`
Dolomite
All

Answer :D
Discussion
754.

The standard reduction potential values of the three metallic cations X,Y and Z are 0.52, -3.03 and -1.18 V respectively . The order of reducing power of the corresponding metal is ?

Answer»

`YgtZgtX`
`XgtYgtZ`
`ZGTYGTX`
`ZgtXgtY`

ANSWER :A
Discussion
755.

Which one of the following basic radical (s) is//areprecipitated as sulphides in acidic medium in qualitative analysis?

Answer»

`Pb^(2+)`
`CU^(2+)`
`CD^(2+)`
`ZN^(2+)`

Answer :A::B::C::D
Discussion
756.

Which species has lone pair on central atom?

Answer»

`CCI_4`
`CH_4`
`NH_4^+`
`H_2O`

ANSWER :D
Discussion
757.

Which of the following is a non-reducing sugar ?

Answer»




SOLUTION :Because C-1 of both UNITS are LINKED through GLYCOSIDIC LINKAGE
Discussion
758.

Which of the following compounds can be detected by Molisch's Test ?

Answer»

Nitro compounds
Sugars
Amines
Primaryalcohols

Solution :Molisch's Test: This is a general test for carbohydrates. ONE or two drops of alcoholic solution of `alpha`-naphthol is added to 2 ml GLUCOSE solution. 1 ml of conc. `H_2SO_4`solution is added carefully along the sides of the testtube. The formation of a violet ring at the junction of two LIQUIDS confirms the presence of a carbohydrate or sugar.
Discussion
759.

What is paramagnetism of a substance due to ?

Answer»

SOLUTION :Paramagnetism of a SUBSTANCE is due to the presence of one or more unpaired electrons which are attracted by the magnetic FIELD.
Discussion
760.

Which of the following alcohol on dehydration with conc H_(2)SO_(4) gives but-2- ene?

Answer»

2-methylpropan-2-ol
Butan-1-ol
2-methyl propan-1-ol
Butan-2-ol

Answer :B::D
Discussion
761.

Write the names of reagents used to bring about the following transformations. (i) C_6H_5COCl rarr C_6H_5CHO

Answer»


ANSWER :`C_6H_5COClrarrC_6H_5CHO` ROSENMUNDS REDUCTION, REAGENTS `H_2/Pd-BaSO_4`
Discussion
762.

Which of the following is the correct representation for formation of sigma bond?

Answer»




Solution :`SIGMA` BOND `rArr` end on overlap
Discussion
763.

The value of X on the [Ni(CN)_4]^x is:

Answer»

`+2`
`+3`
Zero
Zero

Answer :B
Discussion
764.

Which will show hyperconjugation?

Answer»

`H_2 C-CH=underset(|)C-`


ANSWER :A::B::C
Discussion
765.

Write the name of a neutral oxide of carbon.

Answer»

SOLUTION : CARBON MONOXIDE (CO)
Discussion
766.

Write the crossed aldol condensation.

Answer»

SOLUTION :Aldol condensation can also takes place between two different aldehydes or ketones or between one aldehydes and one KETONE such an aldol condensation is called crossed or mixed aldol condensation. This reaction is not very useful as the product is usually a mixture of all possible condensation products and cannot be SEPARATED EASILY.
`underset("formaldehyde")(HCHO)+underset("acetaldehyde")(CH_(3)CHO)overset(dil,NaOH)tounderset("3-hydroxy propanol")(HO-CH_(2)-CH_(2)-CHO)`
`underset("formaldehyde")(HCHO)+underset("acetone")(CH_(3)-underset(O)underset(||)(C)-CH_(3))overset(dil,NaOH)tounderset("4-hydroxy butan-2-one")(HO-CH_(2)-CH_(2)-underset(O)underset(||)(C)-CH_(3))`
Discussion
767.

The silver halide, which is least soluble in NH_4OH is:

Answer»

AgF
AgCl
AgBr
AgI

Answer :D
Discussion
768.

Which of the following is a step growth polymer:

Answer»

Bakelite
Polyethylene
Teflon
PVC

Answer :A
Discussion
769.

Which of the following does not refer to the principal forms of carbohydrate present in our food ?

Answer»

CELLULOSE
Starch
Sucrose
FRUCTOSE.

ANSWER :A
Discussion
770.

Which of the following are electrophili substitution reactions?

Answer»




NONE of these

Answer :A::B::C
Discussion
771.

Which of the following metal hydroxides does not dissolve in sodium hydroxide solution?

Answer»

`Zn(OH)_(2)`
`AL(OH)_(3)`
`FE(OH)_(3)`
`Pb(OH)_(2)`

Solution :`Fe(OH)_(3)` does not dissolve in NAOH.
Discussion
772.

Thortretite, Sc_(2)Si_(2)O_(7) is :

Answer»

a orthosilicate
a pyrosilicate
a SHEET silicate
a cyclic silicate

Solution :`Sc_(2)Si_(2)O_(7)` CONTAINS `Si_(2)O_(7)^(-6)` units
Discussion
773.

Write the oxidation, reduction and overall redox reaction taking place in the Lithium ion battery.

Answer»

Solution :At the anode oxidation occurs
`""Li_((s)) rarr Li_((AQ))^(+)+E^(-)`
At the cathode reduction occurs
`""LI^(+)+CoO_(2(s))+e^(-) rarr LiCoO_(2(s))`
OVERALL reactions
`Li_((s))+CoO_(2) rarr LiCoO_(2(s))`
Discussion
774.

The time for which the oxygen atom remains adsorbed on a tungsten surface is 0.36 s at2550 K and 3.49 s at 2360 K. Calculate the activationenergy of desorption of oxygen atom. Assumign that the oxygen atom is tight chemisorbed, calculate per-exponential factor tau_(0) in the Arrhenius type equation.

Answer»

Solution :From Arrhenius-type equation
`log ""(tau_(2))/(tau_(1))=(E_(a))/(2.303R)((1)/(T_(2))-(1)/(T_(1)))`
At `T_(1)=2550K, tau_(1)=0.36s`
At `T_(2)=2360K, tau_(2)=3.49s`
`thereforelog""(3.49)/(0.36)=(E_(a))/(2.303xx8.314)((1)/(2360)-(1)/(2550))`
log` 9.694=(E_(a))/(2.303xx8.3174)((1)/(2360)-(1)/(2550))`
`log 9.964=(E_(a))/(2.303xx8.314)((190)/(2360xx2550))`
or `E_(a)=(0.9865xx2.303xx8.314xx2360xx2550)/(190)=598273J MOL^(-1)=598.27kJ mol^(-1)`
To calculate `tau_(0),`
`TAU=tau_(0)E^(E_(a)//RT)`
or `ln tau _(0)+(E_(a))/(RT)or log tau=logtau_(0)+(E_(a))/(2.303RT)`
Substituting `T=2360 K, tau =3.49s`
`log 3.49=log tau_(0)+(598273)/(2.303xx8.314xx2360)`
`log tau_(0)=0.5428-13.2399=-12.6971=bar(13).3029`
or `tau_(0)=` Antilog `bar (13).3029=2.0xx10^(-13)s`
Discussion
775.

Which has maximum value of equilibrium constant ?

Answer»

`CF_(3)COOH + H_(2)O HARR CF_(3)COO^(-) + H_(3)O^(+)`
`HCOOH + H_(2)O hArrHCOO^(-) + H_(3)O^(+)`
`CH_(3)COOH + H_(2)O hArrCH_(3) - COO^(-) + H_(3) O^(+)`
`C_(6)H_(5)COOH + H_(2)O hArr C_(6)H_(5)- COO^(-)+H_(3)O^(+)`

Answer :A
Discussion
776.

Which emits beta-particles

Answer»

`._(1)H^(3)`
`._(6)C^(14)`
`._(19)K^(40)`
All

Solution :Because all are radioactive ISOTOPES and can emit `alpha , BETA " &" gamma`-particles.
Discussion
777.

Which of the following titanium compounds cannot be prepared ? (Atomic No. of Ti =22)

Answer»

TIO
`TiO_2`
`K_2TiO_4`
`TiCl_2`

ANSWER :C
Discussion
778.

Which one is monodentate ligand:

Answer»

`F^-`
`NO_2^-`
`H_2O`
All are correct

Answer :D
Discussion
779.

Which of the following ions can form paramagnetic as well as diamagnetic complexes (without considering magnetic property of ligands)?

Answer»

`Fe^(2+)`
`CO^(3+)`
NI
`Fe^(3+)`

ANSWER :A::C::D
Discussion
780.

The values of colligative properties of colloidal solutions are of small order in comparison to those shown by true solutions of same concentration because colloidal particles

Answer»

exhibit enormous surface area.
REMAIN suspended in the dispersion medium.
form LYOPHILIC colloids.
are comparatively less in NUMBER.

Solution :Number of colloidal particles is smaller in the same AMOUNT of the substance. It is because of large size of colloidal particles.
Discussion
781.

Which element of 1A group is most abundantly found in combined state:

Answer»

Li
Na
Cs
K

Answer :B
Discussion
782.

What is tetraethoxy silane ? How is it obtained ?

Answer»

Solution :Tetraethoxy silane is `Si(OC_(2)H_(5))_(4)`.
The CHLORIDE ion in silicon tetrachloride can be substituted by nucleophile such as OH, OR, etc.. Using suitable reagents. For example, it forms SILICIC ESTERS with alcohols.
`SiCl_(4)+C_(2)H_(5)OH to UNDERSET("Tetraethoxy silane")(Si(OC_(2)H_(5))_(4))+4HCl`
Discussion
783.

Whichof thefollowingis nota greemn housegas ?

Answer»

NITROGEN
Carbonoixide
OZONE
Mehtane

Answer :A
Discussion
784.

Which of the following is nylon 6 ?

Answer»

`[HN(CH_2)_4CO]_n`
`[HN(CH_2)_3CO]_n`
`[HN(CH_2)_2CO]_N`
`[HN(CH_2)_5CO]_n`

ANSWER :D
Discussion
785.

Which one is most polar ?

Answer»

` C Cl_4 `
` CHCl_3 `
`CH_3Cl`
`CH_3OH `

ANSWER :D
Discussion
786.

Which of the following ions forms a hydoxide that is highly soluble in water?

Answer»

`K^(+)`
`Zn^(2+)`
`NI^(2+)`
`AI^(3+)`

Solution :Solubility of hydroxide (of s-block) `prop (1)/(L.E.)`
Discussion
787.

Write two factors that affect the rate of a chemical reaction.

Answer»

Solution :Factors AFFECTING RATE of a chemical reaction
(i) CONCENTRATION of reactants.
(ii) TEMPERATURE.
Discussion
788.

The sodium lauryl sulphate is_____.

Answer»

an ANIONIC DETERGENT
a CATIONIC detergent
a non-ionic detergent
all of these

Answer :A
Discussion
789.

What are the uses of acetic acid?

Answer»

Solution :ACETIC ACID is used
(i) as table vinegar (ii) for COAGULATING rubber LATEX (iii) for manufacture of cellulose ACETATE and poly vinylacetate
Discussion
790.

Which of the following statements are correct about this reaction? .

Answer»

The GIVEN reaction follows `S_(N^2)` mechanism.
(ii) and (IV) have OPPOSITE configuration.
(ii) and (iv) have same configuration.
The given reaction follows `S_(N^(1))` mechanism.

Solution :(a,b) are both correct
Discussion
791.

Which of the following compound would not evolve CO_(2) when treated with NaHCO_(3) solution ?

Answer»

SALICYLIC acid
phenol
benzoic acid
4-nitrobenzoic acid

SOLUTION :Phenol does not decompose SODIUM CARBONATE or sodium bicarbonate, i.e., `CO_(2)`is not evolved, because phenol is a weaker acid than carbonic acid.
Discussion
792.

Which does not react with water ?

Answer»

`B_4C`
`B_2S_3`
`Al_4C_3`
`Al_2S_3`

ANSWER :A
Discussion
793.

Which of the following is used in the prepration of chlorine ?

Answer»

Only `MnO_(2)`
Only `KMnO_(4)`
Both `MnO_(2)` and `KMnO_(4)`
Either `MnO_(2)` and `KMnO_(4)`

Solution :`MnO_(2) + 4HClrarr MnCl_(2) + 2H_(2)O + Cl_(2)`
`2KMnO_(4) + 16HCl rarr 2KCl + 2MnCl_(2) + 8H_(2)O + 5Cl_(2)`
Discussion
794.

Write the most polar and most stable conformer of 1-nitropropane.

Answer»


ANSWER :`(##RES_CHM_SIM_E01_033_A01##)`ANTIFORM, it is most POLAR & STABLE.
Discussion
795.

The units of entropy are :

Answer»

`J MOL^(-1)`
`JK^(-1) mol^(-1)`
`J g^(-1)`
`JK mol^(-1)`

ANSWER :B
Discussion
796.

Which of the following elements will show only +3 oxidation state?

Answer»

SN
Tl
Pb
In

Solution :AMONG the GIVEN elements, INDIUM (In) will show only +3 oxidation states.
`Sn : +2, +4, Pb, +2, +4 , Tl : +1 , +3`.
Discussion
797.

Whichoneof thefollowingis calledRaney's Nickel ?

Answer»

NICKEL infreestateofDivision
nickel -aluminumalloy
Nickel - Aluminalloy alloy
Nickel- ALUMINUM alloy

Answer :A
Discussion
798.

Write the cell reaction which occur in the lead stroage battery (i) When the battery is in use, (ii) When the battery is charging.

Answer»

Solution :(i) `Pb(s) + PbO_2(s) + 2H_2SO_4(aq)to 2PbSO_4(s) + 2H_2O(L)`
At anode : `Pb(s) + SO_(4)^(2-)(aq) to PbSO_4(s) + 2E^(-)`
At cathode : `PbO_2(s) + SO_(4)^(2-) (aq) + 4H^(+)(aq) + 2e^(-) to PbSO_4(s) + 2H_2O(l)`
(II) `2PbSO_4(s) + 2H_2O(l) to Pb(s) + PbO_2(s) + 2H_2SO_4(aq)`.
Discussion
799.

Which of the following statement is incorrect regarding the complete hydrolysis of Marshall's acid ?

Answer»

Caro's acid is an intermediate PRODUCT
Two molecules of `H_(2)SO_(4)` and one molecule of `H_(2)O_(2)` are the final product
HYBRIDISATION and oxidation state of central atom remain unchanged in the final product
Both final products can act as oxidising as well as reducing AGENT

Answer :D
Discussion
800.

Which of the following statements is true about hydrogen bonding?

Answer»

Cl and N have comparable electronegativities yet there is no H - bonding in HCl because size of Cl is large
Intermolecular H - bonding RESULTS in decrease in m.p and b.p.
lce has maximum DENSITY at `0^@C` due to H - bonding
`KHCl_2 (HCl_2^(-))` EXISTS but `KHF_2(HF_2^(-))` does not EXIST due to lack of H - bonding in HCl

Answer :A
Discussion