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14351.

Which compound does not decolourize bromine dissolved in carbon tetrachloride ?

Answer»

`C_2H_2`
`C_3H_6`
`CH_4`
`C_2H_4`

ANSWER :C
Discussion
14352.

Which of the following is not a bio-polymer ?

Answer»

POLYSACCHARIDE.
PROTEIN.
BUTYL RUBBER.
Nucleic acid.

Solution :Butyl rubber
Discussion
14353.

The unit of specific resistence is equal to ………………… .

Answer»

OHM METRE
`Ohm^(-1)` metre
`Ohm^(-1) "metre"^(-1)`
Ohm

Answer :A
Discussion
14354.

Which of the following amines can be prepared by Gabriel synthesis.

Answer»

Isobutyl amine
2-Phenylethylamine
N-methylbenzylamine
Aniline

Solution :Only primary aliphatic amines such as `(CH_(3))_(2)CH_(2)CH_(2)NH_(2)` (a) and `C_(6)H_(5)CH_(2)CH_(2)NH_(2)` (b) can be prepared by Gabriel synthesis, `2^(@)` amines, i.e., `C_(6)H_(5)CH_(2)NHCH_(3)` (C) and aromatic `1^(@)` amines, i.e., `C_(6)H_(5)NH_(2)` (d), however, cannot be prepared.
Discussion
14355.

Write reaction between acetyl chloride and dimethyl cadmium.

Answer»

SOLUTION :`2CH_(3)COCI+Cd[CH_3]_2overset("DRY")underset("ETHER")to2CH_(3)-underset(O)underset(||)C-CH_(3)+CdCI_(2)`.
Discussion
14356.

The river 'Sone' receives wastes from

Answer»

Refinery
Distillery
Textile mill
Paper mill

Answer :D
Discussion
14357.

What happens when Ethyne is hydrolysed in the presence of HgSO_4and H_2SO_4?

Answer»

SOLUTION :
Discussion
14358.

What is meant by 'Chelate effect' ? Give an example.

Answer»

Solution :When a BIDENTATE or a POLYDENTATE attaches itself to a metal ion, the complex formed is much more STABLE compared to when a monodentate attaches itself the metal ion.This is called chelate effect.
Example :
Ethylenediamine which is bidentate LIGAND attaches to the metal ion from TWO points as shown and ring is formed which makes the complex stable.
Discussion
14359.

The two ions A^+ and B^- have radii 40 pm and 120 pm respectively. In the closed packed crystal of compound AB, the coordination number of A^+ would be

Answer»

6
8
4
12

Answer :C
Discussion
14360.

when 1.8 g of steam at the normal boiling point of water is converted inot water ,at the same temperature , enthalpy and entropy changes respectively will be[given , DeltaH_("vap")for water =40.8 KJ mol^(-1) ]

Answer»

`-8.12kJ,11 .89Jk^(-1)`
`10.25 kJ,12 .95 Jk ^(-1)`
`- 4.08 kJ,-10.93 JK^(-1)`
`10.93 KJ, -4.08 JK^(-1)`

Solution :` DeltaH("CONDENSATION") for 1.8 g of steam `
` = (-40.8)kJ XX (1.8/18) MOL =- 4.08 KJ`
` DeltaS= (DeltaH)/(T_(B))= (-4.08xx10^(3)J)/(373.15 K ) =- 10.93 JK^(-1)`
Discussion
14361.

Which of the following exhibits pink colour

Answer»

`Nd^(3+)`
`SM^(3+)`
`Dy^(3+)`
`CE^(4+)`

Answer :A
Discussion
14362.

Which of the followingis most acidic ?

Answer»




ANSWER :A
Discussion
14363.

The secondary structure of a protein refers to :

Answer»

Hydrophobic interactions
Sequence of `ALPHA`-amino acids
Fixed CONFIGURATION of the POLYPEPTIDE backbone
`alpha`-helical backbone.

Answer :C
Discussion
14364.

Comment on the nature of two S–O bonds formed in SO_(2) molecule. Are the two S–O bonds in this molecule equal ?

Answer»

Solution :Both the S-O bonds in `SO_2` are covalent and have EQUAL strength due to RESONANCE.
Discussion
14365.

Which of the following conversion can be brought about under Wolff-Kishner reduction ?

Answer»

BENZALDEHYDE to BENZYL alcohol
Cyclohexanol to cyclohexane
Cyclohexanone to cyclohexanol
Benzophenone to DIPHENYL METHANE

ANSWER :D
Discussion
14366.

Which one following formulae does not represent an organic compound

Answer»

`C_(4)H_(10)O_(4)`
`C_(4)H_(8)O_(4)`
`C_(4)H_(7)ClO_(4)`
`C_(4)H_(9)O_(4)`

Answer :D
Discussion
14367.

Which of the following compounds is optically acitve

Answer»

`(CH_(3))_(2)CHOH`
`CH_(3)underset(CI)underset(|)CHCH_(2)COOH`
`(CH_(3))_(3)C CI`
`CH_(3)underset(CH_(3))underset(|)CHCH_(2)COOH`

Answer :B
Discussion
14368.

Which of the following are examples of aldol condensation ?

Answer»

`2CH_(3)CHO overset("diL NAOH")to CH_(3)CHOHCH_(2)CHO`
`2CH_(3)COCH_(3) overset("ull. NuOH")to CH_(3)C(OH)(CH_(3))CH_(2)COCH_(3)`
`2HCHO overset("dil. NaOH)to CH_(3)OH`
`C_(6)H_(5)CHO+HCHO overset("dil. NaOH")to C_(6)H_(5)CH_(2)OH`

Answer :A::B
Discussion
14369.

What happens when (i) PCl_(5) is heated ? (ii) H_(3)PO_(3) is heated ? Write the reactions involved .

Answer»

Solution :`(i) PCl_(5) to PCl_(3)+Cl_(2)`
(ii) On HEATING, phosphorus acid disproportionates to give orthophosphoric acid and phosphire.
`4H_(3)PO_(3)to3H_(3)PO_(4)+PH_(3)`
Discussion
14370.

Which of the following compounds will not liberate nitrogen gas on reaction with nitrous acid ?

Answer»

Diethylamine
Aniline
N-Phenylmethanamine
All of these.

Solution :In all these COMPOUNDS, there is no `NH_(2)` group on the SIDE chain. NONE of these will liberate `N_(2)` gas.
`(C_(2)H_(5))_(2)NH+HNO_(2) rarr (C_(2)H_(5))_(2)N NO`

Discussion
14371.

Which gas has more percentage in coal gas ?

Answer»

CO
H
`H_2`
`CH_4`

ANSWER :C
Discussion
14372.

Which has largest C-O bond length in the given, complexes ?

Answer»

`NI(CO)_(4)`
`[FE(CO)_(4)]^(2-)`
`[Co(CO)_(4)]^(-)`
`[CU(CO)_(4)]^(+)`

Answer :B
Discussion
14373.

What are limited spectrum antibiotics? Give one example.

Answer»

SOLUTION :Narrow spectrum antibiotics are EFFECTIVE against a single ORGANISM or disease and referred to as limited spectrum antibiotics, e.g., penicillin G.
Discussion
14374.

Which of the following contain weaker Ppi-ppi back bonding?

Answer»

`Ocl_(2)`
`OVERSET(ө)(C)Cl_(2)`
Both
None

Solution :`N//A`
Discussion
14375.

The standar reduction potentials of Zn^(2+)|Zn,Cu^(2+)||Cu^(2+)|Cu| Zn |Zn^(2+)||Ag^(+)|AgIIICu|Cu^(2+)||Ag^(+)|Ag What is the correctorder of E_(cell)^(@)of thesecells ?

Answer»

`II gt IIII`
`IIgtIgtIII`
`IgtIIgtIII`
`IIIgtIgtII`

SOLUTION :Given `Zn^(2+) rarrr Zn`
`CU^(2+) rarr Cu`
`Ag^(+) rarr Ag`
Cell reaction of Iis `Zn + Cu^(2+) rarr Zn^(2+) +Cu`
`E_(cell)^(@)=E_("oxidation" + E_("reduction")=+0.76 +0.34 =+1.10 V `
cellreactionof (III)is `Cu+Ag^(+) rarr Cu^(2+) +Ag`
`E_(cell)^(@) =- 0.34 +0.8 =+0.46 V`
So the correct order of `E_(Cell)^(@)` of these CELLIS `IIGT IgtIII`
Discussion
14376.

Which of the following statements is/are incorrect?

Answer»

The entropy of the UNIVERSE decreases and increases at a specificf rate
The entropy of the universe increases and tends towards the maximum VALUE.
For endothermic spontaneous processes, the total entropy CHANGE decreases
The entropy of the universe decreases and tends to zero.

Answer :A::C::D
Discussion
14377.

Which pair of the following substances is said to be isomorphous?

Answer»

White VITRIOL and BLUE vitriol
Epsom salt and Glauber salt
Blue vitriol and Glauber salt
White vitriol and epsom salt.

ANSWER :D
Discussion
14378.

When you heat chloroform with silver powder ……… is formed.

Answer»

ethene
ETHYNE
methane
ETHANE

Solution :`underset("Chloroform")(CHCl_(3))+6Ag+ Cl_(3)CH rarr underset("Ethyne")(CH-=CH)+6AgCl`
Discussion
14379.

Vitamin B_(1) is ………………….

Answer»

THYMINE
THIAMINE
PYRIDOXINE
RIBOFLAVIN

SOLUTION :Thiamine
Discussion
14380.

Which of the followingunsaturated hydrocarbons gives chloropene ( a monomer for neoprene) when treated with HCl in the presence of CuCl

Answer»

`CH-=C-C-=CH`
`CH_(2)=CH-C-=CH`
`CH_(2)=CH-CH=CH_(2)`
`CH_(2)=CHCH_(2)CH_(3)`

SOLUTION :N/A
Discussion
14381.

Which isomer of cyclohexane hexachloride is a very strong insecticide

Answer»

`ALPHA`
`beta`
`gamma`
`delta`

ANSWER :C
Discussion
14382.

What prompted Bartlett to the discovery of noble gas compounds.

Answer»

Solution :Since `PtF_(6)` oxidises `O_(2)` to `O_(2)^(+),` Bartlett THOUGH that `PtF_(6)` should also oxidise `XE` to `Xe^(+)` because the ionization energies of `O_(2)("1175 kJ mol"^(-1))` and `Xe ("1170 kJ mol"^(-1))` are QUITE close.
Discussion
14383.

Which gives ketonic group after hydroboration oxidation :

Answer»

`CH_(3)-CH_(2)-C-=CH`

`C Cl_(3)-C-=CH`
`CH_(3)-underset(CH_(3))underset(|)(CH)-C-=CH`

ANSWER :C
Discussion
14384.

Which of ther following are biopolymers ?

Answer»

Nucletic acids
LEATHER
BAKELITE
ORLON

Answer :A::B
Discussion
14385.

What are fuel cells? Discuss the working of fuel cell.

Answer»


ANSWER :
Discussion
14386.

When 1 mol of potassium succinate is electrolysed between Pt electrodes, number of moles of gaseous product obtained at cathode and anode are respectively.

Answer»

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

Answer :A
Discussion
14387.

Which of the following are not used as food preservatives?

Answer»

Table salt
Sodium hydrogencarbonate
Cane sugar
Benzoic ACID 

ANSWER :B::C
Discussion
14388.

Which of the following is the correct sequence of decreasing reactivity towards hydroxide ion promoted hydrolysis among the following compounds?

Answer»

`IgtIIgtIIIgtIV`
`IIgtIgtIVgtIII`
`IIIgtIIgtIVgtI`
`IgtIIIgtIIgtIV`

ANSWER :C
Discussion
14389.

When HCl (aq) is titrated with NaOH(aq) conductometrically then the graphical representation of the titration will be

Answer»




ANSWER :A
Discussion
14390.

Which of the following ion will not form coloured aqueous solution?

Answer»

`CU^(2+)`
`FE^(3+)`
`Ti^(4+)`
`Ni^(2+)`

ANSWER :C
Discussion
14391.

Theunknowcompoundis takenin vessesoluble In diluteHCland small amountof NaNO_(2)is added , nitrogengasis evolvednitrogen gasin evolved . Theunknowcompoundis

Answer»

`1^(@)` amine
alchols
`2^(@)`amines
carboxylic ACIDS

ANSWER :A
Discussion
14392.

When excess of SnCl_(2) is added to HgCl_(2), the substance formed is

Answer»

 `HgCl_(2)`
Sn
 Hg
`CI_(2)`

Answer :C
Discussion
14393.

Which of the following complexes or molecules has/ have N-N bond length greater than that in free N_(2) molecule?

Answer»

`[Ru(NH_(3)_(5)(N_(2))]^(+)`
`[Ni(Pme_(3))_(3)(N_(2))]`
`[CoH(PPh_(3))_(3)(N_(2))]`
`N_(2)O`

SOLUTION :In (a),(b),(c ) N-B.L.`UARR` due to SYNERGIC bonding while in `N_(2)O`,B.L.`uarr` due to resonance.
Discussion
14394.

Which gives positive haloform test and positive Fehling's solution :

Answer»

ACETONE
ACETALDEHYDE
Ethanol
Formaldehyde

ANSWER :B
Discussion
14395.

Which one of the following can act as an insulator?

Answer»

BAKELITE
ALUMINIUM
COPPER
NACL Solution

Answer :B
Discussion
14396.

Which of the following has highest number of geometrical isomers.

Answer»




SOLUTION :
Discussion
14397.

The sp^(3)d^(2) hybridization of central atom of molecule would lead to

Answer»

square PLANAR geometry
tetrahedral geometry
trigonal bipyramidal geometry
octahedral geometry.

Solution :`sp^(3)d^(2)` hybridization of central ATOM of a molecule would LEAD to octahedral geometry.
Discussion
14398.

The total vapour pressure of a mixture of 1 mole of A (P_A = 200 mm Hg) and 3 mole of B (P_B= 360 mm Hg) is 350 mm Hg. Then

Answer»

There is no DEVIATION from Raoult's law
There is positive deviation from Raoult's law
There is negative deviation from Raoult's law
MOLECULAR masses of A and B are ALSO REQUIRED

ANSWER :B
Discussion
14399.

What is coupling reaction?

Answer»

Solution :The reaction of diazonium salts with PHENOLS in basic medium (pH9-10) or with `1^(@)` amines in acidic medium (pH 4-5) to give the corresponding AZO DYES is called to COUPLING reaction.
Discussion
14400.

Which of the following is a protein hormone?

Answer»

Insulin
Oxytocin
BOTH (A) AND (B)
NONE

ANSWER :C
Discussion