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17001.

Which of the following shows variation of electron gain enthalpy values (on y-axis) of halogens

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ANSWER :B
Discussion
17002.

Which of the following metals can be used for precipitation of silver from sodium argento cyanide solution

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Zn
Cu
Al
All

Answer :D
Discussion
17003.

Which of the following complexes has a geometry different from others?

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`[NiCl_(4)]^(2-)`
`Ni(Co)_(4)`
`[Ni(CN)_(4)]^(2-)`
`[ZN(NH_(3))_(4)]^(2+)`

Solution :`[Ni(CN)_(4)]^(2-) IMPLIES sqr.planar`
Discussion
17004.

Which of the following is not an explosive?

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Nitroglycerine
o-Aminotoluene
Dynamite
Trinitrotoluene

Solution :Explosives INVARIABLY contain two or more -`NO_2` groups, hence o-aminotoluene (not having any-`NO_2` GROUP) is not an EXPLOSIVE. All other three COMPOUNDS have three-`NO_2` groups per molecule.
Discussion
17005.

Which characteristic of adsorption is wrong ?

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Physical adsorption in general decreases with temperature
Physical adsorption in general INCREASES with temperature
Physical adsorption is a REVERSIBLE process
Adsorption is LIMITED to the SURFACE only

Answer :B
Discussion
17006.

which electronic level allows the hydrogen atom to absorb a photon but not emita photon?

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1s
3s
2p
3d

Answer :A
Discussion
17007.

Which of the following compound will not react with l_(2)//OH^(-).

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`CH_3-CHO`

SOLUTION :N//A
Discussion
17008.

Which of the following structures is not correctlymatched ?

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`alpha`- Methoxypropionaldehyde - `overset(""H_(3)CO)overset("" |)(H_(3)C- CH)-overset(O)overset("||")C-H`
3 - Hydroxybutanal - `CH_(3)-overset(OH)overset(|)(CH)-CH_(2)CHO`
4 - Oxopentanal - `CH_(3)CH_(2)CH_(2)-overset(O)overset("||")C-CHO`
Di-sec. - butylketone - `CH_(3)CH_(2)-overset(" CH"_(3))overset(|)(CH)-overset(O)overset("||")C-overset(" CH"_(3))overset(|)(CH)-CH_(2)CH_(3)`

SOLUTION :4-Oxopentanal : `CH_(3)-overset(O)overset("||")C-CH_(2)-CH_(2)-CHO`
Discussion
17009.

What is meant by the term coordination number?

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SOLUTION :The NUMBER of NEAREST NEIGHBOURS in a packing is called coordination number
Discussion
17010.

Which of the following is true for the complex Co(NO_(2) )(Cl)_(2) .5NH_(3) (Co is in + 3 oxidation state)

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It SHOWS IONISATION isomerism
It is INNER ORBITAL complex
It is diamagnetic
All

Answer :D
Discussion
17011.

Which one of the following orders is correct for the bond dissociation enthalpy of halogen molecules?

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`Br_(2)gt I_(2) gt F_(2) gt Cl_(2)`<BR>`F_(2) gt Cl_(2) gt Br_(2) gt I_(2)`
`I_(2) gt Br_(2) gt Cl_(2) gt F_(2)`
`Cl_(2) gt Br_(2) gt F_(2) gt I_(2)`

Solution :`Cl_(2) gt Br_(2) gt F_(2) gt I_(2)`
Discussion
17012.

Which of the following properties of pure metal makes it more useful than the corresponding alloy

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It is harder than CORRESPONDING ALLOY
It has high DENSITY
It can be extraced easily
It conducts heat and electricity easily

SOLUTION :All metals conducts heat and electricity.
Discussion
17013.

What is meant by denticity of a ligand? Find out denticity of:(i) C_(2)O_(4)^(-2) (ii)EDTA

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SOLUTION :The NUMBER of ligand group COORDINATING group.
(i) 2
(ii)6
Discussion
17014.

Which is optically inactive?

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None of these

Solution :FORMULA trienes SHOW only geometrical isomersim, not optical isomerism because these molecuels are PLANAR.
Discussion
17015.

Which of the following reagents is used to distinguish between benzoic acid from phenol ?

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Molish reagent
Tollen's reagent
5% NAOH
Neutral `FeCl_3`

Solution :Phenol as well as benzoic acid form salt with `NaOH_((aq))` . Both are unaffected by Tollen.s reagent and Molisch reagent . Phenol form coloured COMPLEX with `FeCl_3` unlike benzoic acid .
`FeCl_3 +6 C_6 H_5 OH to 3 H^(+) + [Fe (OC_(6) H_(5))_(6) ]^(3-) + 3HCL`
Discussion
17016.

Which of the following statements regarding rusting of iron is // are correct ?

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It takes place is moist air.
It is STOPPED in `CO_(2)` atmosphere
If produces `FE(III)` oxide.
It is an electrochemical process.

Solution :Refer section
Discussion
17017.

Which of the following is a metal ?

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N
Bi
As
P

Answer :C
Discussion
17018.

Which of the following have coiled helical structure:

Answer»

Proteins
Lipids
Carbohydrates
Vitamins

Answer :C
Discussion
17019.

Which of the following is a basic amino acid?

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ANSWER :C
Discussion
17020.

Two moles of an ester (A) are condensed in the presence of sodium ethoxide to give a beta-keto-ester (B) and ethanol. On heating in an acidic solution, (B) gives ethanol and beta-keto acid (C). On decarboxylation, (C) gives 3-pentanone. Identify (A), (B) and (C) with proper reasoning. Name the reaction involved m the conversion of (A) to (B).

Answer»

SOLUTION :
Discussion
17021.

What is the molar mass of a gas whose density is 1.5 g L^(-1) at 27^(@)C and 1 atm pressure ? (Use R = 0.08L atm mol^(-1) K^(-1))

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360
720
36
18

Solution :`M = ( dRT)/( p ) = ( 1.5 XX 0.08 xx 300)/( 1) = 36`
Discussion
17022.

Which of the following releases metal slowly which gives uniform coating in electroplating

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METAL salts
Double salts
Complex salts
Alums

Answer :C
Discussion
17023.

What are the two important oxidation states of group 6 elements of the periodic table ?

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SOLUTION : +3 and +6.
Discussion
17024.

Under the influence of an electric field, the particles in a sol migrate towards cathode. The coagulation of the same sol is studied using NaCl,N_2a_4S andN_3a_4P solutions. Their coagulating values will be in the order :

Answer»

`N_2a_4S`
`N_2a_4p_3S`
`N_3a_4P`
`N_(24)a_3 S`

Solution :SINCE the SOL particles migrate towards CATHODE, they are positively charged. HENCE, anions would be effective in coagulation. Greater is the valence of effective ion, smaller will be its coagulating value.
Discussion
17025.

What is the side product of soap industry? Give reactions showing soap formation.

Answer»

Solution :Soaps are sodium or potassium salts of long chain fatty acids such as stearic ACID, oleic acid and palmitic acid.
Soap containing salts are formed by HEATING fat (i.e., glyceryl ester of fatty acid) with aqueous sodium hydroxide.
In this reaction, esters of fatty acids are hydrolysed and the soap obtained remains in colloidal form. It is precipitated from the solution by ADDING `NaCl`. The solution left after removing the soap contains glycerol as SIDE product. This reaction is known as saponification.
Discussion
17026.

What is the increasing order of acidic strength among the following ? (i) p-methoxy phenol (ii) p-methyl phenol (iii) p-nitro phenol

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`II LT III lt i`
`iii lt ii lt i`
`i lt ii lt iii`
`ILT iii lt ii`

SOLUTION :
Discussion
17027.

What is the general electronic configuration of the outer orbitals of d-block elements ?

Answer»

SOLUTION :`(n-1)d^(1–10)NS^(1-2)`
Discussion
17028.

Which is the true regarding rate of formation of haloforms?

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RATE of FORMATION of `"CHF"_(3)` is highest
Rate of formation of `"CHI"_(3)` is highest
Rate of formation of all are equal
Rates cannot be related

Answer :B
Discussion
17029.

Which of the following oxide is diagmagnetic

Answer»

NO
`NH_(3)`
`N_(2)H_(4)`
`N_(2)H_(2)`

SOLUTION :There are no free electron in `N_(2)O_(4)`, so it is diamagnetic in nature.
Discussion
17030.

Which of the following compound has highest melting point ?

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`SiO_(2(s))`
`H_(2)O_((s))`
`Mg_((s))`
`CO_(2(s))`

Answer :A
Discussion
17031.

Which of the following have a meso form? (a) 2,3-Dibromobutane (b) 2,3-Dibromopentane (c) 2,4-Dibromopentane

Answer»

Solution :(a) and (c) are meso FORMS (DRAW the PROJECTION forms to VERIFY)
Discussion
17032.

Which compound show both G.I. and O.I. ? (AA = Symetric bidentate ligand) (AB = Asymetric bidentate ligand) M = Metal

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`"M(AA)"_(3)`
`M(AB)_(3)`
(1)& (2)
None

Solution :`2CH_(3)-COOH overset(Ca(OH)_(2))rarr(A) overset(Delta)rarr(B)overset((i)OH^(Theta))UNDERSET((ii)Delta)rarr (C)`
Discussion
17033.

Which of the following is an organometallic compound?

Answer»

LITHIUM methoxide
Lithium ACETATE
Lithium dimethylamide
Methyl lithium

Answer :D
Discussion
17034.

Which reagent among the following can affect the conversion ? CH_(3)-C equiv N rightarrow CH_(3)CH_(2)NH_(2)

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`H_(2), Pt`
AMMONICAL` AgNO_(3)`
`LiA/H_(4)`
`NaBH_(4)`

Answer :A::C
Discussion
17035.

What happens when in presence of sodium ethoxide: (i) Ethyl-3-methylbutanoate reacts with acetone(ii) Ethyl formate reacts with acetophenone (iii) Ethylpropanoate reacts with propanenitrile(iv) Diethyl oxalate reacts with diethyl adipate?

Answer»

SOLUTION :
Discussion
17036.

Three Faradays of electricity are passed through molten Al_(2)O_(3) , aqueous solutio of CuSO_(4) and molten NaCl taken in different electrolytic cells. The amount of Al, Cu and Na deposited at the cathodes will be in the ratio of

Answer»

1 MOLE: 2 mole : 3 mole
3 mole : 2 mole : 1 mole
1 mole : 1.5 mole : 3 mole
1.5 mole : 2 mole : 3 mole

Solution :`Al^(3+) + 3e^(-) RARR Al, Cu^(2+) + 2e^(-) rarr Cu Na^(+) + e^(-) rarr Na.`
Three Faradays will DEPOSIT 1 mole of Al,1.5 moles of Cu and 3 moles of Na.
Hence, MOLAR ratio `= 1 :1.5 : 3`
Discussion
17037.

What is the ratio of volumes of H_(2) and O_(2) liberated during electrolysis of acidified water?

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`1:2`
`2:1`
`1:8`
`8:1`

ANSWER :C
Discussion
17038.

Which alkaline earth metal compound is volatile

Answer»

`Be_(3)N_(2)`
`Mg_(3)N_(2)`
`Ca_(3)N_(2)`
None

Solution :`Be_(3)N_(2) RARR` COVALENT character
Discussion
17039.

Which monomer is present in [-overset(CH_(3))overset("|")underset(CH_(3))underset("|")"C "-CH_(2)-]_(n)polymer ?

Answer»

Propylene
Propane
2-methyl PROPENE
Isopropane

SOLUTION :2-methyl propene
Discussion
17040.

What is the name of the process of synthesis of mRNA from DNA strand?

Answer»

Tranpiration
TRANSCRIPTION
Transformation
Trans esterification

Solution :Transcription
Discussion
17041.

Wheneletrolysis ofpotassiumacetateis carriedout , get

Answer»

METHANE
ethylene
ethane
acetylene

Answer :C
Discussion
17042.

What are chain transfer agents ? Giving a suitable example , explain the overall effect of these agents on the process of vinyl polymerization.

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Solution :Compounds which bring about the termination of the original polymer chain with the simultaneous initiation of another polymer chain are called chain transfer AGENTS. For example , in presence of `C CI_4`, styrene undergoes polymerization at the same rate as in its absence but the polystyreneformed has a lower AVERAGE molecular mass. Furthermore , it also contains small AMOUNTS of chloride. This may be explained as follows . The growing polystyrene radical chain (I) which would NORMALLY react with another MONOMER molecule instead reacts with chain transfer aget `(C CI_4)` to terminate the original chain and the new free radical produced initiates a new polymerization chain incorporating chloride atom. Thus :
Discussion
17043.

Which of the following act as structural backbones?

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KERATINE , collagen
MYOGLOBIN , INSULIN
Glycine , proline
Alanime , cysteine

ANSWER :A
Discussion
17044.

To an evacuated vessel with movable piston under external pressure of 1 atm, 0.1 mole of He and 1.0 mole of an unknown compound (V.P. = 0.68 atm at 0^(@)C) are introduced. Considering the ideal gas behaviour, the total volume (in L) of gases at 0^(@)C is close to ..... .

Answer»


SOLUTION :As the piston is movable, the GAS pressure is 1 ATM.
`THEREFORE p_(He) = 1-0.68 = 0.32` atm. Apply pV = nRT for He.
Discussion
17045.

Which does not act as bronsted acid ?

Answer»

`NH_4^+`
`CH_3COO^-`
`HCO_3^-`
`HSO_3^-`

ANSWER :B
Discussion
17046.

Which of the following is not a function of proteins in the human body ?

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PREVENTION of activities of antigens in the body
Growth and maintenance of the body
Transport and store nutrients in the body
ACT as a MAJOR SOURCE of energy

SOLUTION :Act as a major source of energy
Discussion
17047.

Which of the following ions is the smallest in size?

Answer»

`CL^(-)`
`Na^(+)`
`MG^(2+)`
`S^(2-)`

ANSWER :C
Discussion
17048.

When NaCl is dissolved in water , the sodium ion becomes :

Answer»

Oxidised
Reduced
Hydrolysed
Hydrated

Answer :D
Discussion
17049.

Which metal oxide behaves as insulators ?

Answer»

TiO
VO 
CUO 
`CrO_2` 

ANSWER :C
Discussion
17050.

Which is most reactive towards Br_(2) in the prsence of FeBr_(3)?

Answer»

Anisole
Benzene
Bromolbenzene
Nitrobenzene

Solution :More the `EDG`, more REACTIVE is the `SE`
In anisole, `(-underset(..)overset(..)(O)CH_(3))` is `overline(E)` donating by resonance `SE` order: `(a) gt (B) gt (c) gt (d)`.
Discussion