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13901.

Which of the following statements is correct about fructose?

Answer»

It is dextrorotatory compound
It exists in the two cyclic forms which is obtained by the ADDITION of OH at C-5 to the gt C =O group
It exists as six membered ring
It is named as FURANOSE as it contain one oxygen and six carbon atom

SOLUTION :It exists in two cyclic forms which are obtained by the addition of-OH at C-5 to the C =Ogroup
Discussion
13902.

Which of the following trihalide is least basic ?

Answer»

`NI_(3)`
`NBr_(2)`
`NF_(3)`
`NCl_(3)`

Answer :C
Discussion
13903.

What is demulsification ?

Answer»

Solution :Demulsification is a process which involves the breaking down of an EMULSION to yield constituent liquids. It can be brought about by:
(i) boiling or freezing or centrifuging.
(ii) ADDING a substance that destroys the emulsifier.
(iii) adding a dehydrating agent in case of water in oil type emulsion.
Examples of demulsifiers.(i) ADDITION of an acid to an emulsion stabilised by sodium oleate.
(ii) Addition of an ELECTROLYTE to DESTROY the charge on the dispersed phase.
Discussion
13904.

Which of the following chemical regent can provide distinctin between the two ionsisation isomers of the formula Co(NH_3)_5BrSO_4 ?

Answer»

`BaCl_2` SOLUTION
DIL. HCl
dil. `H_2SO_4`
FENTON's REAGENTS

ANSWER :A
Discussion
13905.

Which of the following cannot give iodometric titrations

Answer»

`FE^(3+)`
`CU^(2+)`
`PB^(2+)`
`Ag^(2+)`

Answer :C
Discussion
13906.

What is shape selective catalysis ?

Answer»

SOLUTION :CATALYSIS by zeolites is CALLED SHAPE selective catalysis. For details,
Discussion
13907.

The sodium carbonate is manufactured by-

Answer»

CASTNER's process
Solvay's process
Ostwald's process
Electrolysis process

Answer :B
Discussion
13908.

Write IUPAC names of the following compounds:

Answer»

SOLUTION :2,4-Dinitroaniline or 2,4-Dinitrobenzenamine
Discussion
13909.

Write IUPAC names of the following compounds:

Answer»

SOLUTION :p-Nitroso (N,N-dimethyl)BENZENAMINE.
Discussion
13910.

Transition elements have higher enthalpy of atomisation than alkali metals due to

Answer»

High ELECTROPOSITIVE NATURE of transition elements
Larger size of transition elements
Stronger metallic BOND in transition elements
Participation of ns and (n - 1)d electrons in bond formation in alkali metals

ANSWER :C
Discussion
13911.

Which of the following statements is/are not true regarding glycogen ? A) It is non reducing sugar B) It has alpha -1,4- glycosidic linkages only C) It is an animal starch D) The monomer units are glucose and mannose

Answer»

A, B 
A, B, C 
B, D 
A, B, D 

ANSWER :C
Discussion
13912.

What are the physical states of dispersed phase and dispersion medium of forth ?

Answer»

Solution :Dispersed phase = GAS, DISPERSION medium = LIQUID.
Discussion
13913.

underset(Delta)overset(OH^(-))to number of hyperconjugate hydrogen atoms present in major product.

Answer»


SOLUTION :
Discussion
13914.

Which radioactive element is more abundant in India ?

Answer»

THORIUM
Urainium
Radium
Radon

Answer :A
Discussion
13915.

What happens when colloidal solutions of Fe(OH_(3)) and gold sol are mixed ?

Answer»
Discussion
13916.

What is not correct for SO_2(g) ?

Answer»

It is angular in shape
both S - O BONDS are same
It decolourise the `KMnO_4` solution
It is DEHYDRATING AGENT

ANSWER :D
Discussion
13917.

When some potential difference V is applied across a resistance R then the work by the electrical field on the charge q to flow through the circuit in time t will be

Answer»

`QV`
Vit
`i^(2)RT`
`(V^(2)t)/(R )`

SOLUTION :N//A
Discussion
13918.

Which of the following substances when dissolved in water will give a solution that does not conduct electricity

Answer»

Hydrogen chloride
potassium hydroxide
sodium acetate
UREA

SOLUTION :Urea solution does not CONDUCT electricity because it is a COVALENT COMPOUND.
Discussion
13919.

Vapour pressure of chloroform (CHCl_(3)) and dichloromethane (CH_(2)Cl_(2)) at 298 K are 200 mm Hg and 415 mm Hg respectively. Calculate (i) the vapour pressure of the solution prepared by mixing 25.5 g of CHCl_(3)" and : 40 g of "CH_(2)Cl_(2) at 298 K, and (ii) the mole fraction of each component in vapour phase.

Answer»

Solution :(i) Calculation of vapour PRESSURE of the solution
Mass of `CHCl_(3)=25.5g`
Mass of `CH_(2)Cl_(2)=40 g`
Molar mass of `CHCl_(3)=12+1+3xx35.5="119.5 g mol"^(-1)`
Molar mass of `CH_(2)Cl_(2)=12+2+2xx35.5="85 g mol"^(-1)`
`THEREFORE"Moles of "CHCl_(3)=("25.5 g")/("119.5 g mol"^(-1))="0.213 mole,Moles of "CH_(2)Cl_(2)=("40 g ")/("85 g mol"^(-1))="0.470 mole"`
`"Mole fraction of "CHCl_(3)(x_(CHCl_(3)))=(0.213)/(0.213+0.470)=0.312`
`"Mole fraction of "CH_(2)Cl_(2)(x_(CH_(2)Cl_(2)))=1-0.312=0.688`
`P_("total")=p_(CHCl_(3))+p_(CH_(2)Cl_(2))=x_(CHCl_(3))xxp_(CHCl_(3))^(@)+x_(CH_(2)Cl_(2))xxp_(CH_(2)Cl_(2))^(@)`
`=0.312xx200+0.688xx415=62.4+285.5=347.9" mm"`
(ii) Calculation of mole fraction of each COMPONENT in vapour PHASE
As calculated above, `p_(CHCl_(3))="62.4 mm, "p_(CH_(2)Cl_(2))="285.5 mm, "p_("total")="347.9 mm"`
`"Mole fraction of "CHCl_(3)" in the vapour phase "(y_(CHCl_(3)))=(p_(CHCl_(3)))/(p_("total"))=("62.4 mm")/("347.9 mm")=0.18`
Mole fraction of `CH_(2)Cl_(2)` in the vapour phase `(y_(CH_(2)Cl_(2)))=1-y_(CHCl_(3))=1-0.18=0.82`
Note. It is interesting to note that `p_(CH_(2)Cl_(2))^(@) gt p_(CHCl_(3))^(@)`. The show that `CH_(2)Cl_(2)` is more volatile than `CHCl_(3)`. ALSO we observe that mole fraction of `CH_(2)Cl_(2)` is greater than that of `CHCl_(3)` in the vapour phase. Thus, we conclude that vapour phase is richer in the more volatile component.
Discussion
13920.

Whichof the followngreaction is used to makea fuelcell

Answer»

`CD(s)+2Ni(OH)_(3)(s)rarrCd(s)+2Ni(OH)_(2)(s)+H_(2)O(l)`
`Pb(s)+PbO_(2)(s)+2H_(2)(aq)rarr2PbSO_(4)(s)+2H_(2)O(l)`
`2H_(2)(g)+O_(2)(g)rarr2H_(2)O(l)`
`2Fe(s)+O_(2)(g)+4H^(+)(aq)rarr2Fe^(2+)(aq)+2H_(2)O(l)`

Solution :Cellwhichconvertcehemical energy of a FUEL DIRECTLY into electricla energy is called fuel cell reactiontaking place `H_(2) -O_(2)` FUELCELL
`2H_(2) (g)+O_(2) (g) rarr 2H_(21)O(l)`
Discussion
13921.

Which of the following processes does not occur at the interface of phases ?

Answer»

Crystallization
Heterogeneous CATALYSIS
HOMOGENEOUS catalysis
Corrosion

SOLUTION :There is no INTERFACE in homogeneous catalysis.
Discussion
13922.

When log K is plotted Vs 1/T for a 1st order reaction we get a straight line.The slope of the line is equal to

Answer»

`-(EA)/(2.303R)`
`-(Ea)/R`
`-(2.303R)/E_a`
`-(Ea)/(2.303)`

ANSWER :A
Discussion
13923.

Two vessels A and B contain the same gas. If the pressure, volume and absolute temperature of the gas in A are two times as compared to that in B, and if the mass of the gas in B is x grams, the mass of the gas in A will be

Answer»

4X G
`x/2` g
2x g
x g

Answer :C
Discussion
13924.

Which group elements show maximum catalytic activity for hydrogenation reactions ?

Answer»

SOLUTION :7-9 GROUP ELEMENTS .
Discussion
13925.

What is the effect of adding catalyst on the free energy change (DeltaG) of a reaction ?

Answer»

SOLUTION :No change in `DeltaG` occours in the PRESENCE of CATALYST (as free energy of the reactants and PRODUCTS remains the same).
Discussion
13926.

The yellow coloured in NaCl crystal is due to

Answer»

excitation of electronsin Fcentres
REFLECTION of LIGHTFROM ` CI^(-)`ion on the surface
refraction of lightfrom ` NA^(+)`ion
all of the above

Solution :excitation of electronsin F centers
Discussion
13927.

Which has more weight at NTP :

Answer»

ONE LITRE of oxygen
One litre of hydrogen
One litre of nitrogen
One litre of chlorine

Answer :D
Discussion
13928.

Which one of the following is formed when benzaldehyde reacts with alcoholic KOH?

Answer»

BENZYL alcohol
Potassium BENZOATE
BENZOIN
BENZOIC ACID

Solution :Benzoin
Discussion
13929.

What is the oxidation state of S in Na_(2)S_(2)?

Answer»

`+1`
`-2`
`-1`
0

Solution :`Na_(2)S_(2)`
`+2+2x=0 "" thereforex=-1`
Discussion
13930.

Two possible sterostructures of CH_(3)CHOHCOOH, which are optically active, are called

Answer»

atropisomers
enantiomers
mesomers
diastereomers

Answer :B
Discussion
13931.

Whichof the following is usedin our body asa feulfor muscles and nervesand to build andrepair bodytissues ?

Answer»

CANE SUGAR
Fructose
Proteins
Glucose

ANSWER :C
Discussion
13932.

The value of n in the carbonyl (CO)_(n)-Co-Co-(CO)_(n) is

Answer»

4
5
6
8

Solution :COBALT in zero OXIDATION STATE forms `Co_(2)(CO)_(8)`
Discussion
13933.

Which halide is least stable and has doubtful existence ?

Answer»

`C CI_4`
`GeI_4`
`SnI_4`
`PbI_4`

ANSWER :D
Discussion
13934.

Which of the following method is generally not employed for the separation of primary,secondary and tertiary amines?

Answer»

FRACTIONAL DISTILLATION
Hinsberg's method
HOFFMANN's method
FILTRATION

Answer :D
Discussion
13935.

The unit cell present in ABCABC closed packing of atoms is

Answer»

Hexagonal
Tetragonal
Face CENTRED cube
Simple cube

Answer :C
Discussion
13936.

Which is not used in vulcanisation of rubber?

Answer»

`SF_6`
`SF_4`
`SF_2`
`F_2Cl_2`

ANSWER :D
Discussion
13937.

Which statement about corrosive sublimate is incorrect ?

Answer»

It is prepared by heating mercury in chloride
It REDUCES stannic chloride
it OXIDISES stannous chloride
It SUBLIMES READILY

Answer :B
Discussion
13938.

Write down the IUPAC name of K_(2)[Fe(NC)_(3)C1_(2)(NH_(3)2]

Answer»

Solution : The positive PART is named first followed by the negative part. In the negative part the NAMES are written in alphabetical order followed by METAL. So, the name is Potassiumdiamminedichlorotricyano-N-ferrate (FLI).
Discussion
13939.

Which of the following property gradually increase from C to F ?

Answer»

I. P
EA
Shielding Constant
All of these

Answer :C
Discussion
13940.

Write the organic compound formed in tht following equations CH_3-Mg-Br+CO_2overset("dry ether")underset(H_2O^+)to

Answer»

SOLUTION :`CH_3COOH`
Discussion
13941.

The system that forms maximum boiling azeotrope is

Answer»

carbon disulphide-acetone
benzene-toluene
acetone-chloroform
n-hexane - n-heptane

Solution :Acetone - chloroform MIXTURE SHOWS negative DEVIATION from Raoult's law. Hence, for a particular composition, it has lowest vapour pressure and maximum boiling POINT.
Discussion
13942.

Which is true for an element K present in III group of the periodic table

Answer»

It is gas at room temperature
It has oxidation state of +4
It forms `R_(2)O_(3)`
it forms `RX_(2)`

Solution :`AL to III "group " to ` Forms `Al_(2)O_(3)`
Discussion
13943.

Which of the following on reaction with aqueous KOH gives acetaldehyde?

Answer»

1, 2-Dichloroethane
1, 1-Dichloroethane
Ethyl chloride
Chloroacetic acid

SOLUTION :`CH_(3)CHCl_(2)OVERSET(KOH)rarrCH_(3)CH(OH)_(2)overset(-H_(2)O)rarrCH_(3)CHO`
Discussion
13944.

The two amines shown differ by a factor of about 40,000 in their ionisation constants , which is stronger base ? Explain.

Answer»


ANSWER :`(##ALN_CHM_C09(II)_E01_917_A01##)`
is a stronger BASE, In tetrahydroquinoline (II), Ione-pair on nitrogen is used in delocalisation of `pi-` electrons of benzene ring HENCE, BASICITY of II is DECREASED. I resembles allphatic amine II resembles aniline.
Discussion
13945.

What is van’t Hoff factor ? How is it related with : degree of association

Answer»

SOLUTION :`ALPHA = i-1//1//n - 1`
Discussion
13946.

Which of the following cycloalkanes will show cis-trans isomerism?

Answer»




ANSWER :C::D
Discussion
13947.

What is Van’t Hoff factor ?

Answer»

Solution : It is the ratio of normal MOLECULAR MASS to OBSERVED molecular mass. It is denoted as i.
i = normal molecular mass/observed molecular mass
= no. of particles after ASSOCIATION or DISSOCIATION/no. of particles before dissociation or association
Discussion
13948.

Which one is called pseudo solid ?

Answer»

`Caf_2`
Glass
NaCl
All

Answer :B
Discussion
13949.

Which of the following statement(s) is/are correct for an ionic solid AB(s) having NaCl structure? [r_(+)//r_(-)=0.414,"edge length of cube = a"]

Answer»

The number of neighbour of `A^(+)` which are at a distance 'a' from `A^(+)=6`
The number of neighbour of `A^(+)` which are at a distance of `sqrt(3)/(2)` a from `B^(-)=8`
The number of neighbour of `A^(+)` which are at a distance `((2-sqrt(2))/(sqrt(2)))r_(-)` from `A^(+)=6`
The number of neighbour of `A^(+)` which are at a distance `((a)/(sqrt(2)))` from `A^(+)=12`

Solution :(A) Neighbour of `A^(+)` which are at a distance 'a' are `A^(+)` and number is 6
(B) Consider CORNER `B^(-)` and central A+ (O.v. at cube centre), corner `B^(-)` is common in 8 unit cell, so `8A^(+)` are
at a distance `(sqrt(3))/(2)` a from `B^(-)`
(C ) GIVEN value, it is `r_(+)//r_(-)=0.414."So "A^(+)`is trapped between i.e. O.V. `6B^(-)`
Discussion
13950.

What is van’t Hoff factor ? How is it related with : degree of dissociation

Answer»

SOLUTION :`ALPHA = i-1 // N - 1`
Discussion