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20001.

What is meant by 'disproportionation'? Give two examples of disproportionation reaction in aqueous solution.

Answer»

Solution :When the oxidation state of an element in a REACTANT increases in one of the products and decreases in the other product, the phenomenon is called proportionation.
For example, MN (VI) in `MnO_(4)^(2-)+4` changes to Mn (VII) in the product `MnO_(4)^(-)` and to Mn (IV) in the product `MnO_(2)` as shown by the reaction :
`3MnO_(4)^(2-)+4H^(+)to 2MnO_(4)^(-)+MnO_(2)+2H_(2)O`
Similarly, Cr (V) undergoes disproportionation in acidic MEDIUM as follows :
`CrO_(4)^(3-)+8H^(+)to overset(VI)(2CrO_(4)^(2-))+overset(III)(Cr^(3+))+4H_(2)O`
Discussion
20002.

Which one of the following statements is not true regarding (+) - Lactose?

Answer»

`(+) -` Lactose, `C_(12) H_(22) O_(11)`, contains `8 - OH` groups
On hydrolysis, `(+) -` Lactose gives equal AMOUNT of `D- (+) -` glucose and `D- (+) -` galactose
`(+) -` Lactose is a `beta`-glycoside formed by the union of a molecule of `D - (+) -` glucose and a molecule of `D- (+) -` galactose
`(+) -` Lactose is a reducing sugar and does not exhibit MUTAROTATION

Solution :`(+)-` Lactose `(C_(12) H_(22) O_(11))` is a reducing sugar, forms an osazone, and exists in alpha and beta forms which undergo mutarotation. In FACT all reducing sugars undergo mutarotation.
Acidic hydrolysis or treatment with emulsin (which splits `beta`- linkage only) converts `(+)-` lactose into equal amounts of `D-(+)-` gluose and `D-(+)-` glucose.
Discussion
20003.

Which of the following properties is not common for ethylene chloride and ethylidene chloride

Answer»

Both are DIHALOGEN derivatives
Both are positional isomers
Both give same PRODUCT on reacting with alcoholic caustic potash
Both reat with aqu. Caustic potash and given the same product

Solution :Both react with aqu. Caustic potash and give different products
`underset(CI)underset(|)CH_(2)-underset(Cl)underset(|)CH_(2)overset(Aqu. KOH)to underset("OH Etylene")underset(|)(CH_(2))-underset("OH glycol")underset(|)(CH_(2))`
`CH_(3)CHCl_(2)overset(Aqu.KOH)toCH_(3)CH(OH)_(2)underset(-H_(2)O)to underset("Acetaldehyde")(CH_(3)CHO)`
Discussion
20004.

What is the correct order of reactivity of alcohols in the following reaction? R - OH + CHI overset(Zn."dust")(to) R - CI + H_(2) O

Answer»

1° GT 2° gt 3°
1° LT 2° gt 3°
3° gt 2° gt 1°
3° gt 1° gt 2°

Answer :C
Discussion
20005.

Water pollution

Answer»

INCREASES oxygenation
Decreases TURBIDITY
Increases turbidity and deoxygenation
Increases photosynthesis

Answer :C
Discussion
20006.

'x' gm of solute (M. mass = 342) should be dissolved in 500gm of water so as to get a solution having difference of 105^@Cbetween freezing point and boiling point, then 'x' is

Answer»

159
259
359
459

Answer :C
Discussion
20007.

Which forms strongPpi - Ppi bonds:

Answer»

N
As
P
Bi

Answer :A
Discussion
20008.

What is the chemical composition of Nicolprism ?

Answer»

`Al_(2)O_(3)`
`CaSO_(4)`
`CaCO_(3)`
`Na_(3)AlF_(6)`

Answer :C
Discussion
20009.

Which property of colloids is not dependent on the charge on colloidal particles ?

Answer»

TYNDAL EFFECT
COAGULATION
Electrophorsesis
Electro-osmosis

Answer :A
Discussion
20010.

What is pseudo-first order reaction? Give an example.

Answer»

Solution :A reaction whose molecularity is TWO but order is one/ A reaction whose molecularity is more than one but order is one/higher molecular reactions FOLLOWING `1^(st)` order KINETICS.
1. Acid hydrolysis of ethyl acetate
`CH_3COOC_2H_5+H_2O overset(H^+)(rarr)CH_3COOH + C_2H_5OH`
2. Inversion of cane sugar (SUCROSE)
`C_(12)H_(22)O_(11) + H_2O overset(H^+)(rarr) C_6H_(12)O_6 +C_6H_(12)O_6`
Or any other SUITABLE example .
Discussion
20011.

Which is weakest acid in the following?CH3OH,(CH3)2CHOH,CH3CH2OH,(CH3)3COH.

Answer»

`CH_3 OH`
`(CH_3)_2 CHOH`
`CH_3 CH_2 OH`
`(CH_3)_3 COH`

ANSWER :D
Discussion
20012.

Write the general equation for Wurtz reaction.

Answer»

Solution :`R - X("ALKYLHALIDE") + 2Na + X - R("alkylhalide") overset(DRY) underset("ETHER")to R - R("higheralkane") + 2NaX `
Discussion
20013.

What is phenol-formaldehyde polymer. Write down one polymer name of these category and also explain its preparation, properties and uses.

Answer»

SOLUTION :PHENOL-formaldehyde polymers are the OLDEST synthetic polymers. These are obtained by the condensation reaction of phenol with formaldehyde in the presence of either an acid or a base catalyst.
The reaction starts with the initial FORMATION of o-and/or p-hydroxymethylphenol derivatives, which further react with phenol to form COMPOUNDS having rings joined to each other through `-CH`, groups. The initial product could be a linear product - Novolac used in paints.
Discussion
20014.

When KBr is treated with conc H_2SO_4 reddish brown gas is evolved. The gas is:

Answer»

`Br_2`
`Br_2` + HBR
`NO_2`
H_2O_2`

ANSWER :A
Discussion
20015.

Which one of the following is the stablest structure of cyclohexatriene ?

Answer»

CHAIR form
Boat form
Half chair form
Planar form

Answer :D
Discussion
20016.

What is known as a racemic mixture? Give one example. Or Racemix mixture is opticaly inactive. Give reason.

Answer»

Solution :A 50:50 mixture of two enantiomers of any OPTICALLY active compound is called a racemic mixture. It is always optically inactive SINCE rotation CAUSED by the molecules of one ENANTIOMER is EXACTLY cancelled by equal and opposite rotation caused by the molecules of the other enantiomers. for example, an equimolar mixture of (+)-2-bromobutane and (-)-2-bromobutane is called a racemix mixture.
Discussion
20017.

What is Coupling reaction ? Give eqution.

Answer»

Solution :PHENOL couples with BENZENE diazonium chloride in an alkaline solution to form p - hydroxy azobenzene (a red orange DYE).
Discussion
20018.

The species which by definition has ZERO standard molar enthyalpy of formation at 298 K is

Answer»

`Br_(2)(G)`<BR>`Cl_(2)(g)`
`H_(2)O(g)`
`CH_(4) (g)`

Solution :Only ELEMENTARY substance
For `Br_(2)(l) Delta_(f) H^(@) =0`
Discussion
20019.

Which of the following reaction is/are correct

Answer»




ANSWER :A::B::C::D
Discussion
20020.

Thethermometerusedin determinationofdepressionin freezingpointof a solutionis__________.

Answer»

Beackmann THERMOMETER
Kelvinthermometer
joule'sthermometer
Ostwald'sthermometer

ANSWER :A
Discussion
20021.

Which of the following halogen exists in the solid state?

Answer»

`F_2`
`Cl_2`
`Br_2`
`I_2`

SOLUTION :`I_2` exist in SOLID state (STRONGER VANDER WAAL forces of attraction)
Discussion
20022.

Why a substance in its finely divided state acts as effective adsorbent.

Answer»

Solution :When the substance is finely divided than it has more larger SURFACE area and larger is the surface area, GREATER will be efficiency of ADSORBENT
Discussion
20023.

Which is the best leaving group in a nucleophilic substitution reaction?

Answer»



`OH^(-)`

ANSWER :B
Discussion
20024.

What is the anode, cathode and electrolyte of a mercury button cell?

Answer»

SOLUTION :(i) Anode : Zinc amalgamated with MERCURY
(ii) Cathode : HgO mixed with GRAPHITE
(III) Electrolyte : Paste of KOH and ZnO
Discussion
20025.

Which is a correct cell reaction ?

Answer»

`ZN + 2AG^(+) to Zn^(2+) + 2Ag `
`2Ag +Zn^(+) to 2Ag^(+) + Zn`
Both
None

ANSWER :A
Discussion
20026.

Which of the following is incorrectis incorrect IUPAC name :

Answer»




ANSWER :D
Discussion
20027.

Which will liberate hydrogen on reacting with hydrochloric acid ?

Answer»

Copper
Phosphorus
Mercury
Magnesium

Answer :D
Discussion
20028.

What makes a glass different from a solid such as quartz ? Under what condition could quartz be converted into glass ?

Answer»

SOLUTION :Glass is an AMORPHOUS solid in which the constituent particles (`SiO_(4)` tetrahedra) have only a short range order. Quartz is a crystalline form of silica in which `SiO_(4)` units are arranged in such a way that have long ranged order. Quartz can be converted into glass by melting it and COOLING it rapidly.
Discussion
20029.

Which of the following will not liberate H_(2(g)) from acid?

Answer»

`Ti^(2+)`
`V^(2+)`
`Cr^(2+)`
`MN^(2+)`

Solution :`Mn^(3+)|Mn^(2+)` potential is LARGE positive
Discussion
20030.

Which elements are called ferrous metals ?

Answer»

Solution :The elements of the FIRST TRIAD of group 8, 9 and 10, i.e., iron, cobalt and NICKEL are called ferrous metals.
Discussion
20031.

When a fluoride is heated with concentration H_(2)SO_(4) in a glass tube and if a drop of water is held at the mouth of the glass tube, a white deposit formed is of

Answer»

`H_(2)SiF_(6)`
`SiO_(6)`
`H_(2)SiO_(3)`
`SiF_(4)+H_(2)F_(2)`

Answer :C
Discussion
20032.

Whichof the followingstatement is correct

Answer»

Ovalbuminis a simplefoodreserveis EGG- white
blood proteins thrombinand FIBRINOGEN are involvedin bloodclotting
Denaturationmakesproteinmoreactive
Insulinmaintainsthe sugarlevelof in THEHUMAN BODY .

Solution :PHBV
Discussion
20033.

Which species is paramagnetic ?

Answer»

NO
`NO^-`
`NO^+`
All are correct

Answer :D
Discussion
20034.

Write the IUPAC name of [PtCl_2 (en)_2)] (NO_3)_2.

Answer»

SOLUTION :`[Pt Cl_2 (en)_2 ] [NO_3]_2 - ` Dichlorido Bis- (ethylendi-amine). PLATINUM (IV) NITRATE.
Discussion
20035.

Writeequations usedfor the synthesis of (i) terylene , (ii) neoprene.

Answer»

Solution :(i) Terylene is preparedby the CONDENSATION between ETHYLENE glycolandterephthalicacid

(ii) Neoprene is obatined by additionpolymerisationof CHLOROPRENE .
`nCH_(2) = underset("Chloroprene")underset(Cl)underset(|) CH = CH_(2)= CH_(2) overset((NH_(4))_(2)S_(2)O_(8))to (- CH_(2) -underset("Neoprene")underset(Cl)underset(|)(C) = CH - CH_(2) - )_(n)`
Discussion
20036.

Write the structure of the products formed in the following S_(E) reactions :

Answer»


SOLUTION :N//A
Discussion
20037.

Which compound has zero dipole moment ?

Answer»




Solution :
only linear GROUPS and ATOMS, ATTACHED at para to each other will have zero dipole MOMENT.
Discussion
20038.

Which have maximum number of lone pair on central atom :-

Answer»

`SO_(2)`
`SCl_(2)`
`XeF_(2)`
`XeO_(2)F_(2)`

Answer :C
Discussion
20039.

When 5.0 ml of a 1.0 M HCI solution is mixed with 5.0 ml of a 0.1 M NAOH solution, temperature of the solution increases by 2^@C. which of the following can be predicted accurately from this observation?

Answer»

If 10 ml of same HCI is mixed with 10 ml of same NAOH, temperature RISE will be `4^@C`
If 10 ml of 0.05 M HCI is mixed with 10 ml of 0.05 M NaCl the temperature rise will be `2^@C`
If 5 ml of 0.I MHCI is mixed with 5 ml of 0.1 M `NH_3` solution, the temeprature rise will be less than `2^@C`
If 5 ml of 0.1 `MCH_3COOH` is mixed with 5 ml 0.1 M NaOH the temperature rise will be more than `2^@C`

Answer :C
Discussion
20040.

Which one of the following is an ionic crystal ?

Answer»

GLASS
RUBBER
`NACL`
`SiO_(2)`

Solution :`NaCl`
Discussion
20041.

The total number of possible isomeric trimethyl benzene is

Answer»

2
3
4
6

Solution :THREE ISOMERS are POSSIBLE
Discussion
20042.

Which of the following is an outer orbital complex

Answer»

`[FE(CN)_6]^(3-)`
`[Fe(CN)_6]^(4-)`
`[FeF_6]^(3-)`
`[Cr(CN)_6]^(3-)`

ANSWER :C
Discussion
20043.

The strongest acidamong the following is

Answer»

<P>0 nitrobenzoic ACID
p nitrobenzoic acid
BENZOIC acid
o-chlorobenzoic acid

ANSWER :A
Discussion
20044.

Which will be adsorbed more readily on the surface of charcoal and why, NH_(2) or CO_(2)?

Answer»

Solution :(i) The gases having LOW critical temperature are adsorbed slowly, while gases with high critical temperature are adborbed readily.
(ii) Among `CO_(2) and NH_(3)`, `NH_(3)` will be more readily adsorbed on the surface of the CHARCOAL. This is because the critical temperature of AMMONIA gas is quite high than the `CO_(2)`. HENCE, it easily combines with the materials than the `CO_(2)` whether it is solid, liquid or any gases.
Discussion
20045.

Which of the following cannot show positive carbyl amine test?

Answer»




`CH_(3)-NH-CH_(3)`

Solution :Carbyl AMINE TEST GIVEN by `1^(@)`-amine only.
Discussion
20046.

Which of the following aldehydes will show Cannizzaro reaction ?

Answer»

HCHO
`C_(6)H_(5)CHO`
`(CH_(3))_(3)C CHO`
All of these.

Answer :D
Discussion
20047.

Which kind of isomerism is possible for a complex [Co(NH_(3))_(4)Br_(2)]Cl?

Answer»

GEOMETRICAL and ionization
geometrical and optical
optical and ionization
geometrical only

Answer :A::C::D
Discussion
20048.

Which of following acid can not be prepared by using conc. H_(2) SO_(4) from its corresponding salt ?

Answer»

HF
HBR
`H_(2)S`
HI

Answer :A
Discussion
20049.

The strongest base is

Answer»

N, N-diethyl ethanamine
N-ethyl ethanamine
N-methyl methylamine
Phenyl methyl amine.

Solution :`2^(@)` Amines are STRONGER bases than `1^(@)` amines followed by `3^(@)` amines. Further, among `2^(@)` amines, `(C_(2)H_(5))_(2)NH` is more basic than `(CH_(3))_(2)NH` due to stronger + Z-effect of the `CH_(3)CH_(2)` over `CH_(3)` GROW. The option (B) is correct.
Discussion
20050.

What role does adsorption play in heterogeneous catalysis?

Answer»

Solution :In heterogeneous catalysis, the reactant molecules are adsorbed on the SURFACE of the solid catalyst by physical ADSORPTION or chemisorption. As a result, concentration of the reactant molecules on the surface INCREASES and hence the RATE of reaction increases. The product molecules have no affinity for the solid catalyst and are desorbed making the surface free for fresh adsorption.
Discussion