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15501.

What happens when ethyl iodide is treated with aqueous KOH ?

Answer»

SOLUTION :Ethyl iodide reacts with AQ.KOH to form ethyl alcohol
`underset(ethyl iodide)(C_2H_5I)+KOH(aq)rarr underset(ETHYLENE)(C_2H_5OH)+KI`
Discussion
15502.

The same amount of a metal combines with 0.20 g of oxygen and with 3.17 g of a halogen. Hence equivalent mass of halogen is

Answer»

9
35.5
80
127

Solution :0.1 g of oxygen = 1 g of HALOGEN,
 HENCE `"EQUIVALENT mass of halogen"= (1)/(0.1) XX 8 = 80`
(Equivalent mass of O = 8)
Discussion
15503.

Which of the following when heated with KOH and primary amine gives carbylamine test:

Answer»

`CHCl_3`
`CH_2Cl_2`
`CH_3OH`
`CCl_4`

ANSWER :A
Discussion
15504.

The volumes of gases H_2,CH_4,CO_2 and NH_3adsorbed by 1gr of charcoal at 288K are in the order

Answer»

`H_2 GT CO_2 gt NH_3`
`NH_3 gt H_2 gt CO_2`
`CO_2 gt NH_3 gt H_2`
`NH_3 gt CO_2 gt H_2`

SOLUTION :`T_c UARR`PHYSICAL ADSORPTION `uarr`
Discussion
15505.

Which one of the ions in the table below would have the largest value of enthalpy of hydration

Answer»

`{:("Ionic RADIUS in NM","Charge of ion"),("(a) 0.0065",+2):}`
`{:("Ionic radius in nm","Charge of ion"),("(b) 0.095",+1):}`
`{:("Ionic radius in nm","Charge of ion"),("(c) 0.135",+2):}`
`{:("Ionic radius in nm","Charge of ion"),("(d) 0.169",+1):}`

Answer :A
Discussion
15506.

The value of log_(10) K for a reaction A iff B is (Given :Delta_(r)H_(298K)^(@)=-54.07 kJ mol^(-1),Delta_(r)S_(298 K)^(@)=10 JK^(-1) mol^(-1) and R=8.314 JK^(-) mol^(-1), 2.303 xx 8.314xx298=5705)

Answer»

5
10
95
100

Solution :`A IFF B`
`DeltaG^(@)=DeltaH^(@)-TDeltaS^(@)`
`DeltaG^(@)=0-2.303 RT log_(10)K`
`-2.303 RT log_(10)K=DeltaH^(@)-TDeltaS^(@)`,
`2.303 RT log_(10) K=TDeltaS^(@)-DeltaH^(@)`
`log_(10)K=(TDeltaS^(@)-DeltaH^(@))/(2.303 RT)=(298xx10+54.07xx1000)/(2.303xx8.314xx298)=10`.
Discussion
15507.

Which of the follo,,·iag molecu les is capable of forming Z witter ion ?

Answer»

`NH_2CH_2COOH`
`CH_3CH_2NH_2`
`CH_3CH_2COOH`
All of these

Answer :A
Discussion
15508.

Which form contains the maximum percentage of carbon ?

Answer»

WROUGHT IRON
CAST iron
Malleable iron
steel

Answer :B
Discussion
15509.

What are lewis acids and bases? Give two examples for each. Lewis acid: (ii)Lewis bases:

Answer»

Solution :(i) Lewis acid is a SPECIES that accepts an electron pair.
(ii) Lewis acid is a positive ion (or) an electron DEFICIENT molecule.
(iii) EXAMPLE `,FE^(2+),CO_2,BF_3,SiF_4` etc….
(ii)(i) Lewis base is a species that donates an electron pair.
(ii) Lewis base is an anion (or) neutral molecule with atleast one lone pair of electron.
(iii) Example `NH_3,F^(-), CH_2=CH_2,CaO` etc…….
Discussion
15510.

Which of the following order is correct regarding the relative basicity of amines

Answer»




Solution :ELECTRON- releasing group makes aniline more basic and electron attracting group makes it LESS basic. The CORRECT order of BASICITY is
Discussion
15511.

Which among the following is most reactive in nucleophilic addition ?

Answer»

`F CH_(2) - CHO`
`Cl - CH_(2) - CHO`
`Br - CH_(2) - CHO`
`I - CH_(2) - CHO`

ANSWER :A
Discussion
15512.

Which one of the following pairs of reactants does not form oxygen, when they react with each other ?

Answer»

`F_(2),NaOH` solution (hot , conc)
`F_(2),H_(2)O`
`Cl_(2),NaOH` solution(COLD , DILUTE)
`CaOCl_(2),H_(2)SO_(4)` (dilute , small AMOUNT)

ANSWER :C
Discussion
15513.

Which is not true polymer

Answer»

Polymerdoes not CARRY any charge
polymer have high VISCOSITY
Polymer scatter light
Polymer have LOW MOLECULAR weight

ANSWER :D
Discussion
15514.

Vitamin D is also known as:

Answer»

GROWTH vitamin
Ascorbic acid
Reproductive vitamin
Sunshine vitamin

Answer :D
Discussion
15515.

What is the role of pyridine in the acylation reaction of amines?

Answer»

Solution :Pyridine being a BASE removes the HCL formed during the reaction
`UNDERSET(1^(@)" Amine")(R-NH_(2)) + underset("Acetyl chloride")(CH_(3)COCl)+underset("Pyridine")(C_(5)H_(5)N) to underset("N-Alkylacetamide")(R-NHCOCH_(3))+underset("Pyridine hydrochloride")(C_(5)H_(5)OVERSET(+)(N)HCl^(-))`
Discussion
15516.

What is the product obtained when chlorine reacts with ethyl alcohol in KOH?

Answer»

`CHCI_(3)`
`C Cl_(3)CHO`
`CH_(3)Cl`
none

Answer :A
Discussion
15517.

[X]+dil, H_(2)SO_(4) to [y] colourless suffocating gas [y]+K_(2)Cr_(2)O_(7)+H_(2)SO_(4) to green colouration of solution Then, [x] and [y] are

Answer»

`SO_(3)^(2-), SO_(2)`
`CL^(-), HCL`
`S^(2-), H_(2)S`
`CO_(3)^(2-), CO_(2)`

Solution :`underset(.X.)(SO_(3)^(2-))+"dil. "H_(2)SO_(4)rarr underset(.Y.)(SO_(2))+H_(2)O+SO_(4)^(2-)`
Green colouration on reaction with `K_(2)Cr_(2)O_(7)` and `H_(2)SO_(4)` shows that Y is `SO_(2)`.
`K_(2)Cr_(2)O_(7)+H_(2)SO_(4)+underset(.Y.)(3SO_(2))rarr underset("(Green colour)")(Cr_(2)(SO_(4))_(3))+K_(2)SO_(4)and H_(2)O`
This CONFIRMS X is `SO_(3)^(2-)` ion and Y is `SO_(2)` which is colourless suffocating gas.
Discussion
15518.

What will happen to a colloidal dispersion, when electric field is applied to it?

Answer»

SOLUTION :ELECTROPHORESIS will OCCUR
Discussion
15519.

What is the role of desorption in the process of catalysis ?

Answer»

Solution :The role of desorption in CATALYSIS is that (i) it makes the surface available again for more REACTION to OCCUR (ii) it REMOVES the products formed from the surface of the catalyst.
Discussion
15520.

What are vitamins ? How are they classified ?

Answer»

Solution :Vitamins are a group of biomolecules (other than carbohydrates , fats and proteins) most of which cannot be produced by body but MUST be supplied in SMALL AMOUNT to perform specific biological functions of the body.
Types :
(i) Water soluble vitamins : VITAMIN B and C.
(ii) Fat soluble vitamins : Vitamin A, D, E and K.
Discussion
15521.

When a copper wire is placed in a solution of AgNO_(3), the solution acquirs blue colour. This is due to the formation of

Answer»

`Cu^(2+)` ions
`Cu^(+)` ions
Soluble complexof copper with `AgNO_(3)`
`Cu^(-)` ION by the reduction of Cu

Solution :Since, `AG^(+)` ions are reduced to Ag and
`E_(Ag^(+)//Ag)^(o) gt E_(Cu^(++)//Cu)^(o)` Cu is oxidised to `Cu^(++)`.
Discussion
15522.

X' overset(I_(2)//NaOH)(rarr) Iodoform + sodium succinate 'X' is

Answer»

PENTAN - 2- ONE
acetophenone
hexane-2,5-dione
4-ketopentanoic acid.

Answer :C::D
Discussion
15523.

The self ionisation constant for pure formic acid K=[HCOOH_2^+][HCOO^-] has been estimated a 10^(-6) at room temperature. The density of formic acid is 1.22g/cm^3 find the percentage of formic acid molecules in pure formic acid converted to formate ion.

Answer»

`0.002%`
`0.004%`
`0.006%`
`0.008%`

ANSWER :B
Discussion
15524.

X is :

Answer»

(a) `BH_(3),THF` (B) `H_(2)O_(2)//OH^(-)`
`H_(3)O^(+)`
(a) `O_(3)` (b)n `Zn//H_(2)O`
(a) `BH_(3)//THF` (b) `H_(2)O_(2)//OH^(-)`( C) `CrO_(3)`

Answer :D
Discussion
15525.

Which of following compounds will show NGP ?

Answer»

`Ph-OVERSET(CH_3)overset(|)CH-UNDERSET(O"ET")underset(|)overset(CH)overset(|)C-CH_3`
`Ph-underset("OET")underset(|)overset(CH_3)overset(|)C-overset(CH_3)overset(|)CH-CH_2`
Both A and B
none

Answer :A
Discussion
15526.

When a chloride is heated with potassium dichromate and concentrated sulphuric acid, the red gas coming out has the formula

Answer»

`CrOCl_(2)`
`CrO_(2)Cl_(2)`
`CrO_(2)CL`
`CrOCl`

Solution :`4NaCl+ K(2)Cr_(2)O_(7)+"CONC."6H_(2)SO_(4) rarr 2CrO_(2)Cl_(2) + 4NaHSO_(4) + 2KHSO_(4) + 3H_(2)O`
Discussion
15527.

Whatiszwitter ion? Give itsstructure.

Answer»

Solution :(i) Ataqueous solution, the protonformcarbroxyl groupcan betransferred , to theaminogroupof an amino acidleavingthese groups withoppositecharges .
(II)Despitehavingboth positive and NEGATIVECHARGE, this moleculeisneutral and hasamphotericbehaviour . These ions are called d ZWITTER ions .
Discussion
15528.

What will be the name of atomic number 114 according to the IUPAC nomenclature and its symbol respectively is:

Answer»

Unnunnquadium, UUQ
Ununnquastium, Uut
Ununquadium, Uuq
Ununquadium, Uud

Solution :`114rarr` UN un QUAD IUM, UUq
Discussion
15529.

Which metal is used in Fittig reaction ?

Answer»

Mg
K
Na
Fe

Answer :C
Discussion
15530.

To an aqueous solution containing I^(-) and Br^(-) ions , I_(2) and Br_(2) are added . The products of the reaction would be

Answer»

`Br_(2), I^(-)`<BR>`I_(2), Br_(2)`
`I_(2), Br^(-)`
`I^(-), Br^(-)`

Solution :`2I^(-)+Br_(2) to I_(2)^(0)+2Br^(-)`
as `Br_(2)` has HIGHER REDUCTION POTENTIAL than `I_(2)`.
Discussion
15531.

The strength of 20 volume of H_(2)O_(2) is

Answer»

13.6 G/liter
60.7 g/LITRE
160 g/ litre
20.2 g/litre

Solution :`2H_(2)O_(2)rarr2H_(2)O+O_(2)`
22.4L of `O_(2)` at NTP is producted form `H_(2)O_(2)=68g` 20 L of `O_(2)` at NTP is producted from =60.7 g/L
Discussion
15532.

To obtain chromium from chromite the method used is ____ .

Answer»

CARBON reduction
Carbon MONOXIDE reduction
Alumino-thermic process
Electrolytic reduction

Answer :C
Discussion
15533.

Which one of the following is the correct quadratic form of the Ostwald's dilution law equation

Answer»

`alpha^(2)C + alpha K - K = 0`
`alpha^(2)C - alpha K - K = 0`
`alpha^(2)C - alpha K + K = 0`
`alpha^(2)C+alpha K + K = 0`

SOLUTION :According to OSTWALD's dilution law
`K = (C alpha^(2))/(1-alpha)`
or `K - K alpha = C alpha^(2)`
or `C alpha^(2) + K alpha + K alpha - K = 0`.
Discussion
15534.

Which of the following monosaccharide is pentose?

Answer»

Ribose
fructose
Glycogene
Glucose

Answer :A
Discussion
15535.

The values of observed and calculated molecular weights of silver nitrate are 90 and 170 respectively. The degree of dissociation of silver nitrate is

Answer»

0.8
0.7546
0.9573
0.8889

Answer :D
Discussion
15536.

Whatare thebiological importanceof proteins ?

Answer»

Solution :Protein are the funtical unitsof living things playrole in all biogicalproceeses .
(i)All biochemicalreactions occursin the livingsystems arecatalysedby thecatalyticproteinscalledenzymes .
(ii) Proteins such as keratin, COLLAGEN actsas structural back bones.
(iii) Proteinsare usedfor transporting MOLECULES (Haemoglobin),ORGANELLES (Kinesins ) in THECELL andcontrol the movement of moleculesin and outof thecells (Transporters).
(iv) Antibodieshelp the body tofightvariousdiseases.
(v) Proteins areused as MESSENGERS to coordinatemanyfunctions. Insulin &glucagon controls the glucose level in the blood.
(vi)Protein act as receptors thatdetect presence ofcertain signalmoleculesandactivatetheproper response.
(vii) Proteins arealso used to store metals suchas iron (Ferritin) etc.
Discussion
15537.

What are the characteristics of adsorption?

Answer»

Solution :(i) Adsorption can occur in all interfacial faces i.e., the adsorption can occur in between GAS - SOLID, liquid - solid, liquid - liquid, solid - solid and gas - liquid.
(ii) Adsorption is always accompanied by decrease in free energy. When AG reaches zero, the equilibrium is attained.
(iii) Adsorption is a spontaneous process.
(iv) When molecules are getting adsorbed, there is always decrease in randomness of the molecules.
`DeltaG = DeltaH - T DeltaS` where `DeltaG`= Change in free energy
`DeltaH` = change in enthalpy
`DeltaS` = change in entropy
`THEREFORE DeltaH = DeltaG + TDeltaS`
(v) Adsorption is exothermic and it is a quick process.
(vi) If simultaneous adsorption and absoiption take place, it is TERMED as ‘sorption’ and sorption of gases on metal surface is called OCCLUSION.
Discussion
15538.

What is the coordination number of each ion in NaCl ?

Answer»

SOLUTION :Coordination NUMBER of Na+ = 6 Coordination number of CL- = 6
Discussion
15539.

Which one of the following Fischer projection formula represents R - alanine ?

Answer»




ANSWER :B
Discussion
15540.

What is correct statement about J ?

Answer»

it is optically inactive.
It reacts with `NaHCO_(3)` (excess) to evolve 1 mole of `CO_(2)`.
Number of STEREOISOMERS possible by structure of J are 16.
Number of funvtional GROUP (different type ) present in J are 2.

Solution :N//A
Discussion
15541.

Which of the following polymers doesnot involve cross-linkages-

Answer»

bakelite
melamine
polyethene
vulcanised rubber

Answer :C
Discussion
15542.

The Van't Hoff factor (i) for a dilute solution of K_(3)[Fe(CN)_(6)] is

Answer»


Solution :`{:(K_(3)[Fe(CN)_(6)],3K^(+)+Fe(CN)_(6)^(3-),),("10"," "0,"(Before dissociations)"),(" "1-ALPHA "" 3 alpha," "alpha,"(After dissociation)"):}`
Van't Hoff factor `i=1-alpha+3alpha+alpha=1+3alpha`
In very dilute state `alpha =1`, THUS i=4
Discussion
15543.

Which of the following is a solid at room temperature :

Answer»

METHYL chloride
CHLOROFORM
iodoform
Bromofom

Solution :Methyl Chloride GA, Chloroform and Bromoform are liquid , LODOFORM is solid
Discussion
15544.

Which of the following % labelling of Oleum is not possible ?

Answer»

1.06
1.2
1.3
All LABELLING are POSSIBLE

Solution :MAXIMUM labelling possible is `122.5%`
Discussion
15545.

Which of the following terms are correct about enzyme ?

Answer»

PROTEINS
Dinucleotides
NUCLEIC acids
BIOCATALYSTS

SOLUTION :Enzymes are globular proteins and act as biocatalysts.
Discussion
15546.

Which of the following are true for the first order reaction

Answer»

`t_(3//4)=2t_(1//2)`
`t_(15//16)=4t_(1//2)`
`t_(15//16)=3t_(3//4)`
`t_(7//8)=2t_(3//4)`

SOLUTION :a. `t_(7/8)=3xxt_(1/2)=3/2xxt_(3/4),` B. `t_(15/16)=4xxt_(1/2)=2xxt_(3/4)`
Discussion
15547.

The structure of graphite is

Answer»

planner
hexagonal
Octahederal
bucky balls

Answer :B
Discussion
15548.

Which one of the following oxides of chlorine is obtained by passing dry chlorine over silver chlorate at 90^(@)C ?

Answer»

`Cl_(2)O`
`ClO_(3)`
`ClO_(2)`
`ClO_(4)`

SOLUTION :Pure `ClO_(2)` is obtained bypassing dry `Cl_(2) " over " AgClO_(3)` at `90^(@)C`.
`2AgClO_(3)+Cl_(2)("dry") OVERSET(90^(@)C)to 2AgCl+2ClO_(2)+O_(2)`
Discussion
15549.

Which among the following reducing agents is 'not' used to reduce acetaldehyde to ethyl alcohol?

Answer»

Na-Hg and WATER
Zn-Hg and CONC. HCl
`H_(2)`-RANEY NI
`Li-AlH_(4)//H^(+)`

ANSWER :B
Discussion
15550.

when reacted with two moles of CH_(3)MgI followed by hydrolysis, the prodcut formed is :

Answer»




SOLUTION :
Discussion