94420 + Interview Questions in Chemistry in Class 12 Page 285 InterviewSolution

14201.	Which of the following is a polyester polymer ?
Answer» TERYLENE BAKELITE Melamine Nylon-66 Solution :Terylene

Discussion

14202.	When ethanol is passed over red hot copper at 573K, the product formed is
Answer» `CH_3CHO` `CH_3COCH_3` `C_2H_4` `CH_3COOH` ANSWER :A

Discussion

14203.	This is a thermoplastic:
Answer» PVC Bakelite Melamine Protein ANSWER :A

Discussion

14204.	What is the Nernst formula of calculate reduction potential of non standard electrode of Zn\|Zn^(2+) ?
Answer» `E_(ZN^(2+)\|Zn)=E_(Zn^(2+)\|Zn)^(Theta)-(0.059)/(2)log[Zn^(2+)]` `E_(Zn^(2+)\|Zn)=E_(Zn^(2+)\|Zn)^(Theta)-(0.059)/(2)log[(1)/(Zn^(2+))]` `E_(Zn^(2+)\|Zn)=E_(Zn^(2+)\|Zn)^(Theta)+(0.059)/(n)log[Zn^(2+)]` `E_(Zn^(2+)\|Zn)=E_(Zn^(2+)\|Zn)^(Theta)+(0.059)/(2)log[Zn^(2+)]` Solution :e.g., `Zn+Cu^(2+) to Zn^(2+)+Cu_((S)) and Zn\|Zn^(2+)` is oxidation. In which Zn is reactant and `Zn^(2+)` is a PRODUCT. And n=2. `therefore KAPPA (["Product"])/(["Reactant"])=([Zn^(2+)])/(Zn)=[Zn^(2+)]` `E_(Zn^(2+)\|Zn)=E_(Zn^(2+)\|Zn)^(Theta)-(0.059)/(2)log[Zn^(2+)]`

Discussion

14205.	When an atom or an ion is missing from its normal lattice site, a lattice vacancy (Schottky detect) is created In stoichiometric ionic crystals, a vacancy of one ion has to be accompanied by the vacancy of the oppositely charged ion in order to maintain electrical neutrality. In a Frenkel defect an ion leaves its position in the lattice and occupies an interstitial void.This is the Frenkel defect commonly found along with the Schottky defects and interstitials.In pure alkali halides, Frendel defect are not found since the ions cannot get into the intenstitial sites.Frenkel defects are found in silver halides because of the small size of the Ag^+ ion.Unlike Schottky defects. Frenkel defects do not change the density of the solids.In certain ionic solids (e.g. AgBr) both Schottky and Frenkel defects occur. The defects discussed above do not disturb the stoichiometry of the crystalline meterial.There is large Such solids showing deviations from the ideal stoichiometric composition form an important group of solids For example in the vanadium oxide, VO_x, x can be anywhere between 0.6 and 1.3.There are solids which are difficult to prepare in the stoichiometric composition.Thus, the ideal composition in compounds such as FeO is difficult to obtain (normally we get a composition of Fe_(0.85) O but it may range from Fe_(0.93) O to Fe_(0.96)O).Non-stoichiometric behaviour is most commonly found for transition metal compounds through is also known for some lanthanoids and actinodes. Zinc oxide loses oxygen reversibly at high temperature and turns yellow in colour.The excess metal is accomdated interstitially, giving rise to electrons trapped in the neighbourhood.the enhanced electrical conductivity of the non-stoichiometric ZnO arises from these electrons . Anion vacancies in alkali halides are produced by heating the alkali halide crystals in an atmosphere of the alkali metal vapour.When the metal atoms deposite on the surface they diffuse into the crystal and after ionisation the alkali metal ion occupies cationic vacancy whereas electron occupies anionic vacancy.Electrons trapped in anion vacancies are referred to as F-centres (from Farbe the German word for colour) that gives rise to interesting colour in alkali halides.Thus, the excess of potassium in KCl makes the crystal appear violet and the excess of lithium in LiCl makes it pink. The type of seciconductor shown by crystal capable of showing Schotlky defect, will be.
Answer» p-type n-type both None Solution :p-type SEMICONDUCTION is due to empty spaces or HOLES which is in SCHOTTKY defect n-type semiconduction is due to moving electrons

Discussion

14206.	Whichdoes not give iodoform reaction:
Answer» `C_6H_5COOCH_3` `CH_3OH` `CH_3CH_2OH` `CH_3CHO` ANSWER :D

Discussion

14207.	When an atom or an ion is missing from its normal lattice site, a lattice vacancy (Schottky detect) is created In stoichiometric ionic crystals, a vacancy of one ion has to be accompanied by the vacancy of the oppositely charged ion in order to maintain electrical neutrality. In a Frenkel defect an ion leaves its position in the lattice and occupies an interstitial void.This is the Frenkel defect commonly found along with the Schottky defects and interstitials.In pure alkali halides, Frendel defect are not found since the ions cannot get into the intenstitial sites.Frenkel defects are found in silver halides because of the small size of the Ag^+ ion.Unlike Schottky defects. Frenkel defects do not change the density of the solids.In certain ionic solids (e.g. AgBr) both Schottky and Frenkel defects occur. The defects discussed above do not disturb the stoichiometry of the crystalline meterial.There is large Such solids showing deviations from the ideal stoichiometric composition form an important group of solids For example in the vanadium oxide, VO_x, x can be anywhere between 0.6 and 1.3.There are solids which are difficult to prepare in the stoichiometric composition.Thus, the ideal composition in compounds such as FeO is difficult to obtain (normally we get a composition of Fe_(0.85) O but it may range from Fe_(0.93) O to Fe_(0.96)O).Non-stoichiometric behaviour is most commonly found for transition metal compounds through is also known for some lanthanoids and actinodes. Zinc oxide loses oxygen reversibly at high temperature and turns yellow in colour.The excess metal is accomdated interstitially, giving rise to electrons trapped in the neighbourhood.the enhanced electrical conductivity of the non-stoichiometric ZnO arises from these electrons . Anion vacancies in alkali halides are produced by heating the alkali halide crystals in an atmosphere of the alkali metal vapour.When the metal atoms deposite on the surface they diffuse into the crystal and after ionisation the alkali metal ion occupies cationic vacancy whereas electron occupies anionic vacancy.Electrons trapped in anion vacancies are referred to as F-centres (from Farbe the German word for colour) that gives rise to interesting colour in alkali halides.Thus, the excess of potassium in KCl makes the crystal appear violet and the excess of lithium in LiCl makes it pink. In the crystal of Fe_(0.93)O, the percentage of Fe (II) will be
Answer» `15%` `85%` `30%` `78%` SOLUTION :3x+(0.93-x)x2=2 x=0.14 %of Fe as Fe(III)=`0.14/0.93xx100=15%`

Discussion

14208.	Which one of the following polymers will not catch fire
Answer» `(-CF_(2)-CF_(2)-)_(n)` `(-CH_2-CH_(2)-)_(n)` `(-UNDERSET(CL)underset(\|)(C)H-underset(Cl)underset(\|)(C)H-)_(n)` `(-CH_(2)-underset(Cl)underset(\|)(C)H-)_(n)` Solution :Teflon `(-CF_(2)-CF_(2)-)_(n)` is STABLE UPTO 598 K.

Discussion

14209.	Write the IUPAC name of [Ag(NH_3) _2]Cl
Answer» SOLUTION :Diammine SILVER (1) CHLORIDE

Discussion

14210.	XeF_6 on complete hydrolysis gives:
Answer» XE `XeO_2` `XeO_3` `XeOF_2` ANSWER :C

Discussion

14211.	Write the name of an organometallic compounds which is used as a homogeneous catalyst
Answer» SOLUTION :WILKINSON's CATALYST.

Discussion

14212.	Which of the following is the most suitable method of removing the traces of water from ethanol
Answer» HEATING with Na METAL Passig dry HCL through it Distilling it Reacting with MG Solution :Traces of water from ethanol is removed by reacting with Mg metal.

Discussion

14213.	When CH_(2)=CH-COOH is reduced with LiAlH_(4), the compound obtained will be
Answer» `CH_(3)-CH_(2)-CHO` `CH_(3)-CH_(2)-COOH` `CH_(2)=CH-CH_(2)OH` `CH_(3)-CH_(2)-COOH` Solution :`LiAlH_(4)` reduces only the -COOH WITHOUT reducig the DOUBLE BOND. `CH_(2)=CH-COOH OVERSET(LiAlH_(4))to CH_(2)=CH-CH_(2)OH`.

Discussion

14214.	Which of th efollowing is/are incorrect for an ideal gas :
Answer» All the molecules of a gas at given TEMPRATURE have same kinetic energy Average knietic energy of a sample of gas molecules is proportional to `m^(1//2)` Average kinetic energy of a molecule is proportional to m A sample of `O_(2) (g)` initially at STP is compressed to a SMALLER VOLUME at constant temperatue will increase average kinetic energy of a molecule. Answer :A::B::C::D

Discussion

14215.	There are some isomeric amines containing only one N atom. Each one of which forms a chloride salt on treatment with HCl containing 32.42% chlorine. None of them decolorizes Br_(2) water. How many of them does not give carbyl amine test ?
Answer» 2 3 4 5 Answer :C

Discussion

14216.	There are some isomeric amines containing only one N atom. Each one of which forms a chloride salt on treatment with HCl containing 32.42% chlorine. None of them decolorizes Br_(2) water. How many of them can evolve N_(2) on reaction with HNO_(2) ?
Answer» 2 3 4 5 Answer :C

Discussion

14217.	There are some isomeric amines containing only one N atom. Each one of which forms a chloride salt on treatment with HCl containing 32.42% chlorine. None of them decolorizes Br_(2) water. How many of them contains chiral carbon ?
Answer» 1 2 3 4 Answer :A

Discussion

14218.	Whichof the following combination is CORRECT?
Answer» (II) (iv) ( R ) (IV) (III) (Q) (III) (ii) (S) (IV) (i) (S) ANSWER :A

Discussion

14219.	Which of the following combination is CORRECT?
Answer» (I) (III) (Q) (II) (iii) (Q) (III) (iii) (Q) (III) (i) (S) ANSWER :A

Discussion

14220.	Total number of ions pairs present on central atom of each of the molecules of XeF_(6), SF_(6), SF_(4) are.
Answer» ANSWER :2

Discussion

14221.	Which of the following is an outer orbital complex ?
Answer» `[FE(CN)_(6)]^(4-)` `[FeF_(6)]^(3-)` `[CO(NH_(3))_(6)]^(3+)` `[Co(CN)_(6)]^(3-)` Solution :`[FeF_(6)]^(3-)` is OUTER orbital COMPLEX.

Discussion

14222.	Which one is used as food preservative in daily life for domestic purpose ?
Answer» salt sugar Vegetable oil All of the GIVEN SOLUTION :All of the given

Discussion

14223.	Which of the following are condensation copolymers?
Answer» NYLON`-6` Nylon-6,6` Dacron Glyptal Solution :All polysters and polymides are CONDENSATION POLYMERS.

Discussion

14224.	Which of the following conditions is not correct for ideal solution-
Answer» no CHANGE in volume on mixing no change in enthalpy on mixing it OBEY’s Raoult’s law Ionisation of SOLUTE should occurs to a SMALL extent Answer :D

Discussion

14225.	When HgI_(2) is added to aqueous solution of KI, which of the following are not correct statements
Answer» Freezing point is raised Freezing point does not change Freezing point is lowered Boiling point does not change Solution :Explanation : (b) is correct choice as the statement is not correct because freezing point will change. (c ) Is correct choice as the statement is not correct because freezing point is raised in this case as explained in (a). (d) Is correct choice as the statemetn GIVEN is not correct because boiling point will change. (a) Is not correct choice as the statement is correct because number of particles will DECREASE in number due to formation of complex, `2KI+HgI_(2)rarr K_(2)HgI_(4)`, therefore freezing point will be raised.

Discussion

14226.	Which of the following factors is of no significance for roasting sulphide ores to the oxides and not subjecting the sulphide ores to carbon reduction directly ?
Answer» METAL SULPHIDES are thermodynamically more STABLE than `CS_(2)` `CO_(2)`is thermodynamically more stable than `CS_(2)` Metal sulphides are less stable than the corresponding oxides `CO_(2)` is more VOLATILE than `CS_(2)` Answer :C

Discussion

14227.	Which of the correct exponential form of the Arrhenius equations?
Answer» `E_(a)=AE^(-k//RT)` `E_(a)=Ae^(-k//RT)` `k=Ae^(-RT//E_(a))` `k=Ae^(-E_(a)//RT)` ANSWER :D

Discussion

14228.	Which one of the following statement is no true
Answer» Oxides of SULPHUR, nitrogen and carbon are the most widespread air pollutant pH of drinking water should be between 5.5-9.5 Concentration of DO below 6 ppm is good for the GROWTH of fish Clean water WOULD have a BOD VALUE of less than 5 ppm Answer :C

Discussion

14229.	Which of the following will have less value than zero during adsorption ?
Answer» `DELTAG` `DELTAH` `DeltaS` All the GIVEN THREE options. Solution :All the given three options.

Discussion

14230.	When KOH is added to K_(2)Cr_(2)O_(7) solution, the coloure changesfrom "…................" to "…...................." due to the formation of "…...................".
Answer» Answer :ORANGE red OT yellow, `K_(2)CrO_(4)`

Discussion

14231.	The waxes are long chain compounds of fatty acids, which belong to the class of
Answer» ESTERS Ethers Alcohols Acetic acid Solution :WAXES are esters of HIGHER FATTY ACIDS

Discussion

14232.	Which of the following is provitamin -A
Answer» CITRIC acid riboflavin `BETA`-carotene calciferol Answer :C

Discussion

14233.	Which of the following occurs, when two hydrogen atoms bond with each other
Answer» POTENTIAL energy is lowered KINETIC energy is lowered ELECTRONIC MOTION ceases Energy is absorbed Answer :A

Discussion

14234.	Unit of entropy is
Answer» `JK^(-1) "MOL"^(-1)` `J"mol"^(-1)` `J^(-1) K^(-1) "mol"^(-1)` `JK "mol"^(-1)` SOLUTION :Unit of entropy is `JK^(-1) "mol"^(-1)`

Discussion

14235.	The suitable expression for the equilibrium constant of the reaction 2NO_((g))+Cl_(2(g))hArrNOCl_((g)) is
Answer» `K_(c)=([2NOCL])/([2NO][Cl_(2)])` `K_(c)=([2NOCl]^(2))/([2NO]^(2)[Cl_(2)])` `K_(c)=([NOCl]^(2))/([NO][Cl_(2)]^(2))` `K_(c)=([NOCl]^(2))/([NO]^(2)[Cl_(2)]^(2))` ANSWER :B

Discussion

14236.	Which charging the lead storage battery______.
Answer» `PbSO_(4)` anode is reduced to PB. `PbSO_(4)` cathode is reduced to Pb. `PbSO_(4)` cathode is oxidised to Pb. `PbSO_(4)` anode is oxidised to `PbO_(2)`. Solution :* The external current is passed through the cell when lead storage cell UNDERGOES charging process. And in such condition the opposite REACTION is observed with respect to normal reaction of batteries. * In such cases, the reduction of `PbSO_(4)` gives Pb by following manner. `PbSO_(4(S)) +2e^(-) to Pb_((S)) +SO_(4(aq))^(2-)`. * Same electrode behave as anode when charging is not going on. So accordingly, reduction of original `PbSO_(4)` of anode into Pb is carried out. and hence, option (A) is RIGHT.

Discussion

14237.	Which lanthanoid deiposite ions has strong tendency of donation electron ?
Answer» `Sm ^(2+)` `Eu^(2+)` `Yb^(2+)` NONE of these Answer :A

Discussion

14238.	Which of the following is NOT an antibiotic?
Answer» CHLORAMPHENICOL Sulphapyridine Penicillin Bithional Answer :D

Discussion

14239.	Which one is correct
Answer» Molality changes with TEMPERATURE Molality does not change with temperature Molarity does not change with temperature Normality does not change with temperature Solution :Molarity and normality change with temperature because of expansion or CONTRACTION of the liquid with temperature. However, molality does not change with temperature because MASS of the solvent does not change with temperature.

Discussion

14240.	The units of surface tension in cgs and SI units are respectively,
Answer» dyne `cm^(-1), NM^(-2)` POISE, `PA s^(2)` poise, `Nm^(-2)s^(-1)` dyne-s, NS Answer :C

Discussion

14241.	What happens when a lyophilic sol is added to a lyophobic sol?
Answer» Lyophobic sol is protected LYOPHILIC sol is protected FILM of lyophilic sol is formed over lyophobic sol Film of lyophobic sol is formed over lyophilic sol Solution :Lyophilic sols ACT as a PROTECTIVE colloids.

Discussion

14242.	What doyouunderstantby theterm glycosidiclinkage ?
Answer» Solution :In disaccharides or POLYSACCHARIDES , MONOSACCHARIDE are joninedtogetherby an oxide linkageformed byloss of a watermolecule . Sucha linkagebetweentwomonosaccardieunitsthough OXYGENATOM is caled glycosidiclinkage .

Discussion

14243.	Which of the following is a colligative property ?
Answer» SURFACE tension Viscosity Refractive INDEX OSMOTIC pressure Answer :D

Discussion

14244.	What would be the molar mass of a compound if I 6.21 g of it dissolved in 24 .0 g of chloroform form a solution that has a bolling point of 68.04""^(@)C. The bolling point of pure chloroform is 61.7^(@)C and the boiling point elevation constant, K_(b) for chloroform is 3.63^(@)C/m.
Answer» Solution :`DeltaT_(b)=K_(b)xx(W_(B))/(M_(B))xx(1000)/(W_(A))` `T_(b)-T_(b)^(0)=(3.63xx6.21xx1000)/(M_(B)xx24)` `61.7-68.04 = (3.63xx6210)/(M_(B)xx24)` `M_(b)=(3.63xx6210)/(24xx6.34)` `=(22542.3)/(152.16)` `=148.148g//"mol"^(-1)`

Discussion

14245.	Which of the following is not possible electronic configuration for an atom?
Answer» `1s^(2),2S^(2),2p_(x)^(1),2p_(7)^(1)` `1s^(2),2s^(2),2p_(x)^(2),2p_(y)^(2),2p_(z)^(1)` `1s^(2),2s^(2),2p_(x)^(2)` `1s^(2),2s^(2),2p_(y)^(1),2p_(z)^(1)` Answer :C

Discussion

14246.	What is the correct order of spin only magnetic moment (in BM) of Mn^(+2), Cr^&(+2) and V^(+2)?
Answer» `Mn^(+2) GT V^(+2) gt CR^(+2)` `V^(+2) gt Cr^(+2) gt Mn^(+2)` `Mn^(+2) gt Cr^(+2) gt V^(+2)` `Cr^(+2) gt V^(+2) gt Mn^(+2)` Answer :C

Discussion

14247.	What happens whenmethyl chloride is treated with KCN ?
Answer» Solution :`underset("Methyl chloride")(CH_(3)-Cl+KCN)overset(" ETHANOL ")underset(H_(2)O)RARR underset("ETHANE nitrile")(CH_(3)CN)`

Discussion

14248.	What volume of hydrogen gas atandpressure will be consumed in obtainingof elemental boron (atomic massfrom the reduction of boron trichloride with hydrogen :
Answer» Solution :`2BCl_(3) + 3H_(2) RARR 2B + 6HCl` `10.8 xx 2 G "boron" = 3 xx 22.4 LH_(2)` `:. 21.6 g "boron" = 3 xx 22.4 xx 21.6/2xx10.8 = 67.2 LH_(2)`

Discussion

14249.	Which of the following statements is true for an electrochemical cell?
Answer» Reduction occurs at `H_(2)` electrode `H_(2)`is CATHODE and CU is anode `H_(2)`is anode and Cu is cathode Oxidation occurs at Cu electrode Solution :Reduction potential of Cu is more than `H_(2).`

Discussion

14250.	There were 201 rows of spectators sitting in a hall. A magician releases laughing gas (N_2O)from the front, and tear gas (mol. wt. 176) from the rear of the hall simultaneously. Which row of spectators from the front will have a tendency to smile and weep simultaneously?
Answer» ANSWER :134

Discussion

Explore topic-wise InterviewSolutions in .

Which of the following is a polyester polymer ?

When ethanol is passed over red hot copper at 573K, the product formed is

This is a thermoplastic:

What is the Nernst formula of calculate reduction potential of non standard electrode of Zn|Zn^(2+) ?

Whichdoes not give iodoform reaction:

Which one of the following polymers will not catch fire

Write the IUPAC name of [Ag(NH_3) _2]Cl

XeF_6 on complete hydrolysis gives:

Write the name of an organometallic compounds which is used as a homogeneous catalyst

Which of the following is the most suitable method of removing the traces of water from ethanol

When CH_(2)=CH-COOH is reduced with LiAlH_(4), the compound obtained will be

Which of th efollowing is/are incorrect for an ideal gas :

There are some isomeric amines containing only one N atom. Each one of which forms a chloride salt on treatment with HCl containing 32.42% chlorine. None of them decolorizes Br_(2) water. How many of them does not give carbyl amine test ?

There are some isomeric amines containing only one N atom. Each one of which forms a chloride salt on treatment with HCl containing 32.42% chlorine. None of them decolorizes Br_(2) water. How many of them can evolve N_(2) on reaction with HNO_(2) ?

There are some isomeric amines containing only one N atom. Each one of which forms a chloride salt on treatment with HCl containing 32.42% chlorine. None of them decolorizes Br_(2) water. How many of them contains chiral carbon ?

Whichof the following combination is CORRECT?

Which of the following combination is CORRECT?

Total number of ions pairs present on central atom of each of the molecules of XeF_(6), SF_(6), SF_(4) are.

Which of the following is an outer orbital complex ?

Which one is used as food preservative in daily life for domestic purpose ?

Which of the following are condensation copolymers?

Which of the following conditions is not correct for ideal solution-

When HgI_(2) is added to aqueous solution of KI, which of the following are not correct statements

Which of the following factors is of no significance for roasting sulphide ores to the oxides and not subjecting the sulphide ores to carbon reduction directly ?

Which of the correct exponential form of the Arrhenius equations?

Which one of the following statement is no true

Which of the following will have less value than zero during adsorption ?

When KOH is added to K_(2)Cr_(2)O_(7) solution, the coloure changesfrom "…................" to "…...................." due to the formation of "…...................".

The waxes are long chain compounds of fatty acids, which belong to the class of

Which of the following is provitamin -A

Which of the following occurs, when two hydrogen atoms bond with each other

Unit of entropy is

The suitable expression for the equilibrium constant of the reaction 2NO_((g))+Cl_(2(g))hArrNOCl_((g)) is

Which charging the lead storage battery______.

Which lanthanoid deiposite ions has strong tendency of donation electron ?

Which of the following is NOT an antibiotic?

Which one is correct

The units of surface tension in cgs and SI units are respectively,

What happens when a lyophilic sol is added to a lyophobic sol?

What doyouunderstantby theterm glycosidiclinkage ?

Which of the following is a colligative property ?

What would be the molar mass of a compound if I 6.21 g of it dissolved in 24 .0 g of chloroform form a solution that has a bolling point of 68.04""^(@)C. The bolling point of pure chloroform is 61.7^(@)C and the boiling point elevation constant, K_(b) for chloroform is 3.63^(@)C/m.

Which of the following is not possible electronic configuration for an atom?

What is the correct order of spin only magnetic moment (in BM) of Mn^(+2), Cr^&(+2) and V^(+2)?

What happens whenmethyl chloride is treated with KCN ?

What volume of hydrogen gas atandpressure will be consumed in obtainingof elemental boron (atomic massfrom the reduction of boron trichloride with hydrogen :

Which of the following statements is true for an electrochemical cell?

There were 201 rows of spectators sitting in a hall. A magician releases laughing gas (N_2O)from the front, and tear gas (mol. wt. 176) from the rear of the hall simultaneously. Which row of spectators from the front will have a tendency to smile and weep simultaneously?