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1301.

Which one of the follwoing act as catalyst in the interconversion of carbonic acid to water and carbondioxide?

Answer»

LACTOSE
Carbonic anhydrase
Glycosidase
INVERTASE

ANSWER :B
Discussion
1302.

Which species has the largest dipole moment:

Answer»

`NH_3`
`PH_3`
`AsH_3`
`SbH_3`

ANSWER :A
Discussion
1303.

Use of methanol may causes

Answer»

BLINDNESS and death due to its oxidation to `CO_2`
blindness and death due to HCOOH
deficinency of calcium due to FORMATION of salt
disorder of BLOOD hormones

Answer :B
Discussion
1304.

Which of the following pair gets converted into alcohol by reduction ?

Answer»

Acetic ACID and acetaldehyde
Ethyl benzoate and BENZOIC acid
Chloro ethane
(A) and (B) both

Solution :`underset("Acetic acid")(CH_(3)COOH) underset(LiAlH_(4),H_(2)O)overset("Reduction")to CH_(3)CH_(2)OH`
`underset("Acetaldehyde")(CH_(3)CHO) underset(NaBH_(4))overset("Reduction")to underset("Ethanol")(CH_(3)CH_(2)OH)`
(B)
( C) Chloroethane is not CONVERTED to alcohol by reduction.
Discussion
1305.

Which of the following monomer will give Neoprene by polymerization ?

Answer»

`CH_(2) = CH – CI`
`C Cl_(2) = C Cl_(2)`
`CH_(2)-underset(Cl)underset(|)C-CH=CH_(2)`
`CF_(2)=CF_(2)`

Solution :`CH_(2)-underset(Cl)underset(|)C-CH=CH_(2)`
Discussion
1306.

What is corrosion? Explain the electro- chemical theory of rusting of iron and write the reactions involved in the rusting of iron?

Answer»

Solution :The PROCESS of slowly eating away of the METAL due to attack of the moisture and atmospheric gases on the surface of the metal resulting into the formation of compound such as OXIDES, sulphides, carbonates, sulphates etc. is called corrosion. The electrochemical phenomenon of rusting of iron can be described as:
At anode: `FE(s)` undergoes oxidation to releases electrons.
`Fe(s) toFe^(2+) (aq)+2e^(-)`
At cathode: The electrons which are released participate in the reduction reaction and combine with `H^(+)` ions released from carbonic acid `(H_2CO_3)` formed by the combination of `CO_2 and H_2O` present.
`H_2O+CO_2 leftrightarrow H_2CO_3`
`H_2CO_3 leftrightarrow 2H^(+)+ CO_3^(2-)`
`H_2O leftrightarrow H^(+)+ OH^(-)` (reduction)
`H^(+)+ e^(-) to H`
THe hydrogen atoms combine with oxygen either dissolved in water or present in air to form `H_2O` molecule.
`4H+O_2 to 2H_2O`
Thus net result of the redox reaction is to oxidise iron to `Fe^(2+)`.
These further reaction with oxygen and water to form ferric oxide as follows:
`4Fe^(2+) (aq)+O_2+4H_2O to 2Fe_2O_3+8H^(+) (aq)`
Ferric oxide undergoes hydration to form the hydrate oxide also called rust. Protons that are released further TAKE part in th redox reaction.
`Fe_2O_3+xH_2O to Fe_2O_3.xH_2O_(hydrate ferric o x ide)`
Discussion
1307.

Whichhalogenhydracid cannot bestoredin a glass bottle ? Why ?

Answer»

Solution :Hydrofluricacid (HF). Becauseit reacts WITHTHE constituentsof galss (`SiO_(2), Na_(2)SiO_(3) ` ETC) andcorrodes it .
Discussion
1308.

Whichof the followingstatements aboutaspirin is not true ?

Answer»

Aspirin belongs to narcotic analgesies
It is effective in RELIEVING PAIN
It has antiblood CLOTTING ACTION
It is a neurologically active drug.

Answer :A
Discussion
1309.

To prevent spoilage of food materials, which of the following is used ?

Answer»

Antiseptic
antioxidants
Disinfectants
Antacids

Answer :B
Discussion
1310.

What is the shape of XeF_4 ?

Answer»

SOLUTION :SQUARE PLANAR
Discussion
1311.

Which of the following statements is not correct regarding aniline ?

Answer»

It is LESS BASIC than ethylamine
It can be STEAM distilled
It is less basic than m - METHYLANILINE
It is SOLUBLE in water.

Answer :D
Discussion
1312.

When the following aldohexose exists in its D-configuration , the total number of steroisomers in its pyranose form is OHC-CH_(2)-CHOH-CHOH-CHOH-CH_(2)OH

Answer»


Solution :SINCE CONFIGURATION at `C_5` is FIXED for D-series, THEREFORE , there are three other chiral centres and hence there are `2^(3)=8` steroismers.
Discussion
1313.

Which of the following compounds have same percentage composition of carbon?

Answer»

`C_(6)H_(12)O_(6)`
`CH_(3)COOH`
`HCOOCH_(3)` and `HCOOH`
`C_(12)H_(12)O_(11)`

ANSWER :A::B::C::D
Discussion
1314.

Vapour pressure of a liquid depends on

Answer»

VOLUME of container
Amount of liquid
Surface AREA of container
Temperature

Answer :2
Discussion
1315.

The solubility product of silver chloride is 625xx10^(-10)" at "25^(@)C. Find its solubility in gL^(-1)

Answer»

`35.87xx10^(-3)`
`3.587xx10^(-3)`
`35.87xx10^(-2)`
`3.587xx10^(-5)`

ANSWER :B
Discussion
1316.

Why are fluorine and oxygen compounds more aptly called oxygen fluoride ?

Answer»

SOLUTION :This is because FLUORINE is more ELECTRONEGATIVE than OXYGEN.
Discussion
1317.

Vapour pressure of water at 293 K is 17.535 mm Hg. Calculate the vapour pressure of water at 293 K when 25 g of glucose is dissolved in 450 g of water

Answer»

Solution :The DATA provided is WRITTEN as under: `p^0 = 17.535 mm, w_2 = 25g, w_1 = 450 g `
For solute (glucose `C_6H_12O_6`) , `M_2 = 180 g "mol"^(-1)`
For solvent ` (H_2O) , M_1 = 18g "mol"^(-1)`
Applying Raoult.s LAW,
`(p^0 - p_s)/(p^0) = (n_2)/(n_1+ n_2) " or" (p^0 -p_s)/(p_s) =n_2/n_1= (w_2// M_2)/(w_1//M_1)" or " (p^0)/(p_s)- 1 = (w_2M_1)/(w_1 M_2)`
Substituting the values in the above equation, we get
`(17.535)/(p_s) - 1 = (25 xx 18)/(450 xx 180) = 25/4500 " or" (17.535)/(p_s) = 1+ 25/4500 = 4525/4500`
`p_s =17.535 xx 4500/4525 = 17.44 mm`
Discussion
1318.

Which of the following is non-linear molecule

Answer»

`CO_(3)^(2-)`
`CO_(2)`
`CS_(2)`
`BeCl_2`

Solution :Except `CO_(3)^(2-)` other CHOICE `CO_(2),CS_2` and `BeCl_(2)` have sp -HYBRIDISATION and show the linear structure while `CO_(3)^(2-)` have `sp^(3)` hybridisation and show the non linear
Discussion
1319.

What is saturation pressure ?

Answer»

SOLUTION :It is the PRESSURE at which further increase of pressure does not CAUSE further increase in the EXTENT of adsorption.
Discussion
1320.

Which of the following is not a characteristic of a crystalline solid?

Answer»

Definite and characteristic heat of fusion. 
Isotropic nature. 
A regular periodically REPEATED PATTERN of arrangement of constituent particles in the ENTIRE crystal. 
A true solid 

Solution :Crystalline solids are anisotropic that is some of their physical properties like electrical resistance or refractive index show DIFFERENT values when measured along different directions of same crystal. This arises from the different arrangement of atoms along different directions.
Discussion
1321.

The reagent with which both aldehydes and ketones react easily is

Answer»

FEHLING solution
tolen 's reagent
GRIGNARD reagent
SCHIFF reagent

ANSWER :C
Discussion
1322.

What type of building blocks are pressent in the sturcture of zeolites ? What is this structure called ?

Answer»

Solution :The BUILDING BLOCKS in the STRUCTURE of zeolites are truncated octahedra (cubo-octahedra). This structure is called `'beta-`CAGE' or 'sodalite cage'.
Discussion
1323.

Which is stronger base-CH_3NH_2 or C_6H_5NH_2? Why?

Answer»

Solution :`CH_NH_2` is a stronger base than `C_6H_5NH_2`. The +I EFFECT of methyl group increase electron density on nitrogen in `CH_3NH_2` and makes it a stronger base. In aniline the lone pair on nitrogen is delocalised with the benzene ring. So its is LESS BASIC.
Discussion
1324.

When I_(2) is estimated by Na2S2O, iodometrically, blue colour (due to starch), changes to colourless when 12 has completely reacted 2S_(2)O_(2)^(2-)+I_(2)toS_(4)O_(6)^(2-)+2I but after sometimes blue colour reappears. Explain?

Answer»

Solution :This is because some atmospheric oxidation has taken PLACE, forming a which reacts with starch to GIVE the BLUE colour again.
`2I^(-)+(1)/(2)O_(2)+2H^(+)toI_(2)+H_(2)O`
Discussion
1325.

When benzene diazonium hydrogen sulphate is treated with hypophosphorus acid it forms

Answer»

PHENYL hydrazine
azobenzene
phenol
benzene

Solution :SEE PROPERTIES of DIAZONIUM SALT (A section)
Discussion
1326.

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

Answer»

Electrons flow from COPPER ELECTRODE to ZINC electrode
Current flows from zinc electrode to copper electrode
Cations MOVE towards copper electrode
Cations move toward zinc electrode

Answer :C
Discussion
1327.

Which metallurgy involves leaching

Answer»

Au
Ag
Both (a) and (B)
NONE of these

Answer :C
Discussion
1328.

Which of the following is/are Dobereiner's triad? (a)Li, Na, K(b)Cu, Ag, Zn(c)Fe, Co, Ni(d)Ca, Sr, BaCorrect answer is

Answer»

(a) & (B)
(a) & (d)
(b) & (C)
(a),(c) & (d)

ANSWER :B
Discussion
1329.

Which of the following is not an alcohol:

Answer»

`CH_2=CHCH_2OH`
`CH_2OHCH_2OH`
`C_6H_5CH_2OH`
`C_6H_5OH`

ANSWER :D
Discussion
1330.

Which is a degradable pollutant

Answer»

Mercury salts
Aluminium foil
Domestic wastes
D.D.T.

Solution :Domestic WASTAGE are MAINLY made up of degradable ORGANIC compounds.
Discussion
1331.

When 1-butyne is treated with aqueous H_(2)SO_(4)in presence of HgSO_(4), the major product is

Answer»

BUTANAL
Butanone
Butenol
Buten-2-ol

Solution :`{:(LA^(3+):[Xe]5d^(0)6s^(0)),(Lu^(3+):[Xe]4f^(14)5d^(0)6s^(0)),(Ce^(4+):[Xe]4f^(0)5d^(0)6s^(0)):}}mu_("eff")=0`
`Nd^(3+):[Xe]4f^(3)}mu_("eff")ne 0`
Discussion
1332.

The structure given below is known as

Answer»

PENICILLIN F
Penicillin G
Ampicillin
Sulphadiazine

Answer :B
Discussion
1333.

The vapour pressure of a solvent at 293 K is 100 mm Hg. The vapour pressure of a solution containing 1 mole of strong electrolyte (AB_(2)) in 99 moles of the solvent at 293 K is (assume comlete dissociation of the solute).

Answer»

103 MM HG
99 mm Hg
97 mm Hg
101 mm Hg

Solution :According to Raoult's Law
`(P_(A)^(@)-P_(S))/P_(S)="i"n_(B)/n_(A)`
`AB_(2)overset((AQ))toA^(+)(aq)+2B^(-)(aq)`
`i=(1-alpha+nalpha)/1=(1-1+3xx1)/1=3`
`P_(S)^(@)/P_(S)=1+0.03=1.03`
`P_(S)=P_(A)/(1.03)=((100mm))/((1.03))=97.0mm`
Discussion
1334.

Which of the following vitamins are soluble in water ?

Answer»

A and E
D and E
B and C
K

Answer :C
Discussion
1335.

The value of DeltaH - DeltaE for the following reaction at 27^(@)C will be 2NH_(3)(g) rarr N_(2)(g) + 3H_(2)(g)

Answer»

`8.314 XX 273 xx (-2)`
`8.314 xx 300 xx (-2)`
`8.314 xx 27 xx (-2)`
`8.314 xx 300 xx (2)`

Solution :`DeltaH-DeltaE=DeltanRT`
also, `2NH_(3(G))rarrN_(2(g))+3H_(2(g))`
`Deltan=2`.
Discussion
1336.

Which of the following is amphotric oxide? Mn_(2)O_(7) CrO_(3) ,Cr_(2) O_(3) ,CrO , V_(2)O_(3) V_(2) O_(4)

Answer»

`V_(2) O_(5) ,Cr_(2) O_(3)`
`Mn_(2) O_(7) CrO_(3)`
`CRO, V_(2) O_(3)`
`V_(2) O_(5) V_(2) O_(4)`

ANSWER :a
Discussion
1337.

What is double salt ?

Answer»

Solution :It is an ADDITION COMPOUND which LOSES its identity in solution.
Example : Potash Alum.
Discussion
1338.

Which of the elements is/are semiconductor(s) ?

Answer»

Oxygen
Sulphur
Selenium
Seleniumand tellurium

Answer :D
Discussion
1339.

Which of the following is INCORRECT regarding modern vertical retort process ?

Answer»

It is a COMMERCIAL , economical and continuous process.
It has ROLL discharge mechanism.
It involves OXIDATION of metal at high temperature of about 1673 K.
The heating jacket is HEATED by burning producergas.

Answer :C
Discussion
1340.

Whichof the followingcompounds are optically active ?

Answer»

GLYCINE
Carbohydrates
Ethanol
Meso TARTARIC ACID

Answer :B
Discussion
1341.

The total number of rare earth elements is

Answer»

8
32
14
10

Solution :LANTHANIDE's are CALLED RARE EARTH METALS.
Discussion
1342.

What is the equivalent mass ofIO_4^(-) when it is converted into I_2 in acid medium ?

Answer»

`(M)/(6)`
`(M)/(7)`
`(M)/(5)`
`(M)/(4)`

Solution :`IO_(4)^(+7) rarr I_(2)^(0)`
`n_(F)= 7`
Equivalent weight `= ("MOLECULAR weight")/(n_(f))= (M)/(7)`
Discussion
1343.

Thesolubilityof nitrogengasat 2atmpressureat 25^(@)C " is "13.6xx10^(-4) moldm^(-3)calculatethe solubilityof N_(2)gasfromatmosphereat 25^(@)C,of atmospgericpressureis 2atmosphereandpartialpressureof N_(2) gasat thistemperatureandpressure is 1.53atm.

Answer»

`1.60xx10^(-3) MOL DM^(-3)`
`2.16xx10^(-3) mol dm^(-3)`
`1.06xx10^(-3) mol dm^(-3)`
`2.60xx10^(-3) mol dm^(-3)`

ANSWER :C
Discussion
1344.

Which of the following compound will produce more than one acid in aq. solution:

Answer»

`P_(4)O_(6)`
`N_(2)O_(4)`
 `SOCI_(2)`
All of the above

Answer :D
Discussion
1345.

Write the electrochemical mechanism of corrosion.

Answer»

SOLUTION :(i) The formation of rust requires both oxygen and water. Since it is an electrochemical redox process, it requires an anode and cathode in different places on the iron.
(ii) The iron surface and a droplet of water on the surface form a tiny galvanic cell.
(iii) The REGION enclosed by water is exposed to low amount of oxygen and it acts as the anode.
(iv) The remaining area has high amount of oxygen and it act a cathode. So an electro chemical cell is formed. Corrosion occurs at the anode i,e., in the region enclosed by the water.

Anode (oxidation) Iron dissolves in the anode region :
`2Fe_((s)) rarr 2Fe_((aq))^(2+)+4^(-)""E^(@)=0.44V`
The electrons move through the iron metal from the anode to the cathode area where the oxygen dissolved in water, is reduced to water.
Cathode (reduction) :
The REACTION of atmospheric carbon dioxide with water gives carbonic acid which furnishes the `H^(+)` ions for reduction.
`O_(2(g))+4H_((aq))^(+)+4e^(-) rarr 2H_(2)O(l)""E^(@)=1.23V`
The electrical circuit is completed by the migration of ions through water droplet.
The overall redox reactions is,
`2Fe_((s))+O_(2(g))+4H_((aq))^(+) rarr 2Fe^(2+)""_((aq))+2H_(2)O(l)`
`""E^(@)=0.444+1.23=1.67V`
The positive emf value indicates that the reaction is spontaneous.
`Fe^(2+)` ions are further oxidised to `Fe^(3+)` which on further reaction with oxygen to form rust.
`4Fe_((aq))^(2+)+O_(2(g))+4H_((aq))^(+) rarr 4Fe_((aq))^(3+)+2H_(2)O(l)`
`2Fe_((aq))^(3+)+4H_(2)O(l) rarr Fe_(2)O_(3).H_(2)O_((s))+6H_((aq))^(+)`
Discussion
1346.

Which of the following aqueous solution will have highest depression in freezing point?

Answer»

`0.1 ` M urea
`0.1` M SUCROSE
`0.1 MAlCl_(3)`
`0.1 MK_(4)[Fe(CN)_(6)]`

SOLUTION :For `K_(4)[Fe (CN)_(6) ], i =5` HENCE lowest FREEZING point.
Discussion
1347.

What is meant by dispropoertionation of an oxidation state ? Give an example .

Answer»

Solution :When in a REACTION, the oxidation state of anelement in a COMPOUND increasesin one of the PRODUCTS and decreases in the other product, it is said to undergo disproportionation of oxidation stat. For example, in acidic solution, Mn(VI) in `MnO_(4)^(2-)` changes to Mn(VII) in the product `MnO_(4)^(2-)` and to Mn(IV) in the product `MnO_(2)` . Thus, `3overset(VI)(Mn) O_(4)^(2-) + 4H^(+) rarr 2 overset(VII)(Mn) O_(4)^(-) + 2H_(2)O`
Discussion
1348.

The set having incorrect statement is 1. the Hall-Heroult process is used for the production of aluminum and iron 2. pig iron is obtained from cast iron. 3. the blistered appearance of copper during the metallurgical process is due to the evolution of CO_2 4. leaching of bauxite using concentrated NaOH solution gives sodium aluminate and sodium silicate

Answer»

1,2
2,3
1,2,3
1,2,4

Answer :C
Discussion
1349.

When an electrolyte is dissociated in solution, the van.t Hoffs factor (i) is ,

Answer»

gt1
LT1
=0
=1

Solution : : van.t Hoff factor (i) DEPENDS on the number of PARTICLES of SOLUTE . On dissociation of an electrolyte , number of particle of solute increases , therefore i>l
Discussion
1350.

Which of the following statement(s) is/are not correct?

Answer»

Nickel salts give rosy red precipitate with dimethyl glyoxime in excess of `NH_(4)OH`
`Fe(III)` salts give red colour with potassium sulphocyanide
In nitroprusside the IRON and `NO` exists as `Fe(III)` and `NO`
`Mn (II)` salts give WHITE precipitate with `NaOH` which TURNS brown on adding `Br_(2)` water.

Solution :Iron and `NO` exists as `Fe(II)` and `NO^(+)` respectively.
Discussion