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3151.

Which of the following on oxidation with alkaline KMnO_(4) followed by acidification with dilute HCl does not give benzoic acid?

Answer»

Toluene
Ethylbenzene
Iso-propylbenzene
tert-butylbenzene

Solution :DUE to the absence of benzylic H -atom, tert-butylbenzene does not UNDERGO oxidation easily to give BENZOIC ACID.
Discussion
3152.

Which statement among the following are CORRECT ?

Answer»

Hydration effect stabilises DIMETHYL ammonium ion more than trimethyl ammonium ion
In CHLOROBENZENE as there is no hydration effect so, trimethyl ammonium ion gets less stabilised than dimethyl ammonium ion
`RCONH_2` is less acidic with respect to RCOOH
`overset(Theta)CH_3gtoverset(Theta)NH_2gtoverset(Theta)OHgt` is the basicity order

Solution :(A)Due to STERIC hindrance to solvation of conjugate acid
(C )Acidity `PROP` stability of conjugate base
(D)In period `LtoR, K_b` decreases.
Discussion
3153.

What is physical adsorption or physisorption ?

Answer»

Solution :In this type of ADSORPTION, molecules of adsorbate are being HELD to the SOLID surface by weak attractive FORCES called van der WAALS. forces.
Discussion
3154.

Which of the following has maximum number of two-fold axis of symmetry.

Answer»

Ethylene
Cyclopropane
Cyclobutane
BENZENE

Solution :Benzene has two-fold of SYMMETRY.
Discussion
3155.

Which of the following cannot be made by using williamson synthesis?

Answer»

Methoxybenzene
Benzyl p-nitrophenyl ether
tert-Butyl METHYL ether
Di-tert-butyl ether.

Answer :D
Discussion
3156.

Zone refining is based on

Answer»

fractional DISTILLATION
fractional CRYSTALLISATION
CHROMATOGRAPHIC separation
destructive distillation

Solution : Zone refining is based on fractional crystallisation, pure metal crystallizes while the impurities pass on adjacent MOTION zone.
Discussion
3157.

Which of the following reagents can be used as the basis for a simple chemical test for distinguishing 1-butene from CH_(3)CH_(2)CH_(2)CH_(2)OH ?

Answer»

`Br_(2)// C Cl_(4)`<BR>Dilute aqueous `KMnO_(4)`
`CrO_(3)`/aqueous `H_(2)SO_(4)`
none of these

Answer :A::B::C
Discussion
3158.

Which of the following are thermoplastic polymers ?

Answer»

POLYTHENE , urea - formaldehyde , POLYVINYLS
BAKELITE , polythene, polystyrene
Polythene , polystyrene , polyvinyls
Urea - formaldehyde , polystyrene , bakelite

ANSWER :C
Discussion
3159.

The specific rate constant for a fist order reaction depends on the :

Answer»

CONCENTRATION of the reactant
concentration of the PRODUCT
time
TEMPERATURE .

ANSWER :D
Discussion
3160.

Which one of the following geometry is possessed by [CuCl_(2)]^(-) and [Ag(CN)_(2)]?

Answer»

TRIGONAL planar
LINEAR
Tetrahedral
Square planar

Solution :Linear
Discussion
3161.

The vapour pressure of methanol at certain temperature is 1 atm. By adding a small amount of ethyl acetate the vapour pressure of the solution is found to be 684 mm. The relative lowering of vapour pressure is

Answer»

<P>`0.1`
`0.9`
76
`0.694

SOLUTION :Relative LOWERING of vapour PRESSURE `=(P^(@)-P)/(P^(@))`
Discussion
3162.

The structural feature which distinguishes proline from alpha amino acids is

Answer»

It is OPTICALLY inactive
It cantains aromatic group
it si a dicarboxylic ACID
It is a SECONDARY amine

Answer :D
Discussion
3163.

Whatis the number of moles of Fe (OH)_(3) (s) that can be producedby allowing 1 mole of Fe_(2)S_(3) , 2 moles of H_(2) Oand 3 molesof O_(2) to react?2 Fe_(2) S_(3) (s) + 6H_(2) O (1) + 3O_(2) (g) to 4Fe (OH)_(3) (s) + 65 (s)

Answer»

Solution :Fromthe givenmole ratio of `Fe_(2)S_(3) , H_(2) O and O_(2)` (i.e., 1 : 2 : 3) and moleratioin the reaction , (i.e.,e: 6 : 3) it is clearthat `H_(2) O`is the limitingreagent as `H_(2)O`SHALL befullyconsumed in the reaction. Thus,
MOLESOF `Fe(OH)_(3)` produced by2 molesof `H_(2) O = (4)/(6) XX 2 = 1. 34`
Discussion
3164.

Which of the following ions willgive acolourlessaqeoussolution

Answer»

`Ni^(2+)`
`Cu^(o+)`
`Cu^(2+)`
`Fe^(2+)`

ANSWER :b
Discussion
3165.

The work done by 100 calorie of heat is:

Answer»

481.4 J
4.184J
41.84J
None

Answer :A
Discussion
3166.

When a radioactive substance is subjected to a vacuum, the rate of disintegration per second

Answer»

INCREASES considerably
Increases only if the PRODUCTS are gaseous
Suffers a slight decrease

Solution :Rate of disintegration does not depend upon the environment FACTOR.
Discussion
3167.

Write down the strucutres of the steroisomers formed when cis-2-butene is reacted with bromine.

Answer»

SOLUTION :The ADDITION of BROMINE to the but-2-ene invovles anti-addition and thus RACEMIC 2,3-dibromobutane is FORMED.
Discussion
3168.

The structural formula of cyclohexanol is

Answer»




SOLUTION :
Discussion
3169.

Which one of the following is used as an anode in Lithium ion battery?

Answer»

POROUS GRAPHITE
LITHIUM
`CoO_2`
Copper

Answer :A
Discussion
3170.

Which of the following is not a non electrolyte

Answer»


Solution :The substances whose aqueous SOLUTIONS allow the PASSAGE of ELECTRIC current and are CHEMICALLY decomposed, are termed electrolytes. Electrolytic substances are classified as strong or weak according to how readily they DISSOCIATE into conducting ions. acetic acid is a weak electrolyte. Glucose, ethanol and urea are non-electrolytes.
Discussion
3171.

Which of the following is the correct order of the boiling points of hydrides of group-16 ?

Answer»

`H_(2)TE GT H_(2)O gt H_(2)SE gt H_(2)S`
`H_(2)O gt H_(2)Te gt H_(2)Se gt H_(2)S`
`H_(2)O gt H_(2)S gt H_(2)Se gt H_(2)Te`
`H_(2)Te gt H_(2)Se gt H_(2)S gt H_(2)O`

Answer :B
Discussion
3172.

Which of the following compound can give test with Tollen's reagent and yellow precipitate with iodine in NaOH ?

Answer»

`CH_(2)=O`
`CH_(3)-CH=O`
`CH_(3)-CH_(2)-CH=O`
`CH_(2)-underset(O)underset(||)(C )-CH_(2)`

Solution :ACETALDEHYDE is the only ALDEHYDE which gives halform test.
Discussion
3173.

Which of the following characteristic features match(es) with the crystal systems: cubic and rhombohedral?

Answer»

Both have the cell PARAMETERS a = b = c and `alpha=beta=gamma`
Both belong to different crystal systems
Both have only two CRYSTALLOGRAPHIC angles of `90^(@)`
Both belong to same crystal system

Answer :A::B
Discussion
3174.

Which one of the following polymer can be softened and hardened repeatedly on heating and cooling without change in its property ?

Answer»

BAKELLITE
POLYSILOXANE
Urea FORMALDEHYDE resin
PVC

ANSWER :D
Discussion
3175.

Which of the following is correct statement ?

Answer»

`F_2` has higher dissociation ENERGY than `Cl_2`
F has higher electron AFFINITY than Cl
HF is STRONGER acid than HCl
Boiling point increases down the group in halogens

Answer :D
Discussion
3176.

The velocity of disappearance for HI 2.4xx10^(-2) mol L^(-1)S^(-1) calculate the rate of formation of H_(2)

Answer»

SOLUTION :`4.8xx10^(-2)` MOL `L^(-1)S^(-1)`
Discussion
3177.

Which of the following is obtained by condensation polymerization ?

Answer»

TERYLENE
Buna-S
Buna-N
Neoprene

SOLUTION :Terylene
Discussion
3178.

Which of the following statements are correct? (i) Antiseptics are not ingested like antibiotics. (ii)1% solution of iodine in alcohol-water mixture is known as tincture of iodine. (iii)SO_2 in low concentrations are used as antiseptics whereas in higher concentration are used as disinfectants. (iv) Birth control pills essentially contain a mixture of synthetic estrogen and progesterone derivates. Which of the following is the correct code for the statements above ?

Answer»

(i) & (III)
(II) & (iv)
(i)& (iv)
(iii) & (iv)

Solution :For statement (ii), 2-3% solution of iodine in ALCOHOLWATER mixture is known as TINCTURE of iodine. For statement (iii), `SO_2` in very low concentrations are USED as disinfectants.
Discussion
3179.

Which of the following is an artificial edible colour?

Answer»

Tetrazine
Saffron
Carotene
Melamine

SOLUTION :1) Tetrazine ( lemon yellow COLOUR ) is artificial edible colour , (2) Safforon , carotene are natural colour.
Discussion
3180.

Give the IUPAC name of CH_(2)=CH-CHO.

Answer»

SOLUTION :PROP - 2- en -1 - al
Discussion
3181.

XeF_(4) reacts with water at -80^(@)C to give :

Answer»

`XeOF_(2)`
`XeOF_(4)`
`XeO_(3)`
`XeO_(2)F_(2).`

Solution :`XeF_(4)+H_(2)Ooverset(-80^(@)C)rarr XeOF_(2)+2HF`
Discussion
3182.

Which will give immediatetrubidity on shaking with HCl at room temperature ?

Answer»

2-Methylbutan-1-ol
2-Methylpropan-2-ol
2-Ethylbutan-1-ol
3-Methylbutan-1-ol

ANSWER :B
Discussion
3183.

Which of the following compounds give positive Tollen's test ?

Answer»




SOLUTION :
Discussion
3184.

What is the effect of dilution on the molar and equivalent conductance of an electrolyte ?

Answer»

Solution :With DILUTION, more of ions are FORMED in the solution. Therefore, both molar conductance and EQUIVALENT conductance INCREASE upon dilution.
Discussion
3185.

Write the structures of soaps obtained by the hydrolysisfat : (C_15H_31COO)_3C_3H_5Glyceryl palmitate

Answer»

SOLUTION :`C_15H_31COO^(-)NA^(+)`
Discussion
3186.

Value of gas constant R is

Answer»

0.082 LITRE atm
0.987 cal `mol^(-1)K^(-1)`
`8.3 J mol^(-1)K^(-1)`
83 erg `mol^(-1)K^(-1)`

Answer :C
Discussion
3187.

Which of the following statements about sulphur is INCORRECT ?

Answer»

Sulphur exists as octaatomic `S_(8)` molecule with PUCKERED ring structure.
In `S_(8)` molecule, each atom undergoes `sp_(3)` HYBRIDIZATION involving both bonding and non-bonding pairs of electrons.
There are two SINGLE COVALENT BONDS and two lone pairs of electrons associated with each S atom and `S_(8)` molecule.
The S-S-S bond angle in `S_(8)` molecule is `90^(@)`.

Answer :D
Discussion
3188.

Which of the following is not produced using misch metal ?

Answer»

Bullets
Space SUITS
LIGHTER FLINTS
SHELLS

ANSWER :B
Discussion
3189.

The sodium salt of an acid dye contains 7% of sodium. What is the minimum molar mass of the dye ?

Answer»

`336.5`
`286.5`
`300.6`
`306.5`

SOLUTION :N/A
Discussion
3190.

What happens when crotonaldehyde is reduced in the presence of LiAlH_(4)?

Answer»

Solution :`underset(("prop-2-enal"))underset("CROTONALDEHYDE")(CH_(3)-CH=CH-CHO overset((i)LiAlH_(4))underset((II)H_(2)O)to underset("but-2-en-1-ol")underset("crotyl alcohol") (CH_(3)-CH=CH-CH_(2)OH)`
Discussion
3191.

Which one of the following is an incorrect statement?

Answer»

The ionisation POTENTIAL of nitrogen is greater than that of oxygen
The ELECTRON affinity of FLUORINE is greater than that of chlorine
The ionisation potential of beryllium is greater than that of boron
The electronegativity of fluorine is greater than that of chlorine

Answer :B
Discussion
3192.

Which of the following sub-atomic particles is not present in an atom

Answer»

Neutron
Proton
Electron
Positron

Answer :D
Discussion
3193.

Which of the following has a plane of symmetry?

Answer»

2-Methylbutane
PROPANOIC ACID
2-Aminobutane
3-Methylhexane

ANSWER :B
Discussion
3194.

What happens when nitrobenzene is treated with Ni (or) Pt (or) LiAlH_(4)?

Answer»

SOLUTION :Nitrobenzene undergoes REDUCTION with NI (or ) Pt (or) `LiAlH_(4)` to give aniline.
`underset("Nitrobenzene")(C_(6)H_(5)NO_(2))+6[H]underset("or"LiAlH_(4))overset(Ni//Pt//H_(2))(to)underset("Aniline")(C_(6)H_(5)NH_(2))+2H_(2)O`
Discussion
3195.

When 3d-orbital is complete, the newly entering electron goes into:

Answer»

4f
4s
4p
4d

Answer :C
Discussion
3196.

Which one of the following statement is false

Answer»

Work is a STATE function
Temperature is a state function
Change in the state is completely DEFINED when the initial and final STATES are specified
Work appears at the BOUNDARY of the system

Solution :Work and temperature are not state FUNCTIONS as their value are not specific for a state.
Discussion
3197.

Which of the following precipitates K^(+) from its solution?

Answer»

Sodium ferrocyanide
sodium cobaltinitrite
sodium ARGENTO cyanide
sodium bircabonate

Solution :`Na_(3)[CO(NO_(2))_(6)]+3KCL to underset("(FATHER's salt-yellow ppt.)")underset("cobaltinitrile")underset("Potassium")([K_(3)[Co(NO_(2))_(6)]])+3NaCl`
Discussion
3198.

The total number of C atoms in beta- D fructofuranose are

Answer»

6
5
4
7

Answer :A
Discussion
3199.

Time required to deposit one millimole of aluminium metal by the passage of 9.65 amperes through aqueous solution of aluminium ions is

Answer»

30 s
10 s
30,000 s
10,000 s

Answer :A
Discussion
3200.

Which of the following is not a double salt?

Answer»

`KCl.MgCl_(2).6H_(2)O`
`FeSO_(4).(NH_(4))_(2)SO_(4).6H_(2)O`
`KAL(SO_(4))_(2).12H_(2)O`
`K_(4)[FE(CN)_(6)]`

Answer :D
Discussion