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601.

Vitamin C is soluble in water

Answer»


ANSWER :T
Discussion
602.

Which of the following on controlled chlorination will not give different isomer of monochloride derivative ?

Answer»

Iso-butane
2,2-Dimethylpropane
2-Methylpentane
Propane

Solution :2,2-dimethylpropane have only primary carbon atoms, HENCE its ISOMERS can't be formed after CONTROLLED chlorination .
Discussion
603.

Which one of the following has strongest metallic bonding ?

Answer»

Fe
Sc
V
Cr

Answer :D
Discussion
604.

Which of the following polymer can be remelted time to time without producing any change?

Answer»

THERMOSETTING polymers
Thermoplastic polymers
Bakelite
Malamine

Answer :B
Discussion
605.

What is the molarity of H_(2)SO_(4) solution if 25 ml of exactly neutralised with 32.63 ml of 0.164M, NaoH

Answer»

0.107 M
0.126 M
0.214 M
`-0.428M`

SOLUTION :0.164 M NAOH`-=`0.164 N NaOH
We know, `N_(1)V_(1)=N_(2)V_(2),N_(1)xx25=0.164xx32.63`
0.214N `H_(2)SO_(4)-=(0.214)/(2)"M "H_(2)SO_(4)`(`because"BASICITY of "H_(2)SO_(4)` is 2)
`-=0.107" M "H_(2)SO_(4)`
Discussion
606.

Which of the following reaction in the blast furnace is / are endothermic ?

Answer»

`C(s)+O_(2)(g) hArr CO_(2)(g)`
`CO_(2)(g)+C(s) hArr 2CO(g)`
`CaCO_(3)(s) hArr CAO(s)+CO_(2)(g)`
`Fe_(2)O_(3)(s)+3CO(g) hArr 2Fe(l)+3CO_(2)(g)`

Answer :B::C
Discussion
607.

Why are sulphide ores converted to oxide before reduction ?

Answer»

SOLUTION :This is DUE to FACT that sulphide ORES are difficult to reduce as compared to oxide ore. Hence, sulphide ores are converted first into oxide ore.
Discussion
608.

Which of the following aqueous solution does not show straight line graph of sqrt(C) to Lamda_(m) ?

Answer»

NaCN
HCN
NaCl
HCl

Solution :It is a WEAK ELECTROLYTE.
Discussion
609.

Whichof thefollowingis nottertiaryamine ?

Answer»

`(CH_(3))_(3)N`
`(C_(2)H_(5))_(3)N`
`(C_(2)H_(5))_(2)NCH_(3)`is
`(CH_(3))_3CNH_(2)`

Answer :D
Discussion
610.

Which can be described as a molecule with residual bonding capacity ?

Answer»

` N_2`
`CH_4`
NACL
` BeCl_2 `

ANSWER :D
Discussion
611.

Whichof the followingis mostbasicamine ?

Answer»

`C_(2)H_(5)NH_(2)`
`(C_(2)H_(5))_(3)N`
`(C_(2)H_(5))_(2)NH`
`NH_(3)`

Answer :C
Discussion
612.

Which one of the following methods is neither meant for the synthesis nor for separation of a mines?

Answer»

CURTIUS reaction
WURTZ reaction
Hofmann method
Hinsberg method

Solution :Wurtz reaction is for the PREPARATION of hydrocarbons from ALKYL halide
RX + 2NA +XR `to` R-R+2NaX
Discussion
613.

Which of the following complexes have tetrahedral shape ?

Answer»

`[Cu(NH_(3))_(4)]^(2+)`
`[Ni(CO)_(4)]`
`[NiCl_(4)]^(2-)`
`[Zn(NH_(3))_(4)]^(2+)`

ANSWER :B::C::D
Discussion
614.

Which of the following artifical sweetner is a chloroderivative of dissacharide ?

Answer»

Alitame
Aspartane
Sucralose
Saccharine

ANSWER :C
Discussion
615.

What is molarity of a solution of HCl which contains 49% by weight of solute and specific gravity is 1.41

Answer»

`15.25`
`16.75`
`18.92`
`20.08`

ANSWER :C
Discussion
616.

When tetracarbonylnickel(0) is heated , it dissociatesinto its components. If 5 moles of this compound is heated and the resulting gaseous component is absorbed by sufficient amount of I_(2)O_(5), liberating I_(2). What volume of 4M Hypo solution will be required to react with thisI_(2): Ni(CO)_(4)overset(A)rarr Ni + 4 CO

Answer»


ANSWER :2
Discussion
617.

Which of the following can be used distinguish acetamide and urea :

Answer»

Fehling's solution
BIURET test
Hofmann's REACTION
NAOH solution

Answer :B
Discussion
618.

Writethe ratelawfor thefollowingreactions (a)A reactionsthat iszeroorderin A and secondorderin B (b) areactionsthat issecondorder in NO andfirstorderin Br_(2)

Answer»

Solution :(a) Ratelaw : RATE = K`[B]^(2)`
(b)Rate LAW: Rate`= k [NO]^(2) [Br_(2]`
Discussion
619.

Which is the following properties describes the diagonal relationship boron and silicon?

Answer»

`BC l_(3)` is not HYDROLYSED while `SiCl_(4)` can be hydrolysed
Both form oxides `B_(2)O_(3)` is amphoteric and `SiO_(2)` is acidic
Both METALS DISSOLVE in cold and dilute nitric acid
Silicide and boride SALTS are hydrolysed by water

Answer :D
Discussion
620.

Which among the following is an example of absorption?

Answer»

Water on CALCIUM chloride
Water on SILICA gel
Ammonia gas on charcoal
Hydrogen on finely DIVIDED nickel

Answer :A
Discussion
621.

When redox reaction stops by achieving equilibrium then what will be true for E_(cell)^(Theta) of following reaction ? Al_((S)) +3Cu_((aq))^(2+) to 2Al_((aq))^(3+)+3Cu_((S))

Answer»

`E_(cell)^(THETA)=(0.059)/(2)"log"([AL^(3+)]^(2))/([CU^(2+)]^(2))`
`E_(cell)^(Theta)=(0.059)/(6)"log"([Al^(3+)])/([Cu^(2+)])`
`E_(cell)^(Theta)=(0.059)/(6)"log"([Al^(3+)]^(2))/([Cu^(2+)]^(3))`
`E_(cell)^(Theta)=0.059"log"([Al^(3+)]^(2))/([Cu^(2+)]^(3+))`

Solution :`E_(cell)^(Theta)=(0.059)/(6)"log"([Al^(3+)]^(2))/([Cu^(2+)]^(3))`
Discussion
622.

Which of the following can not be grouped as polyolefin ?

Answer»

POLYETHENE
Polypropene
Polystyrene
Bakelite

Answer :D
Discussion
623.

Write the IUPAC name of [Ni(CN)_(4)]^(2-) ion.

Answer»

SOLUTION :tetracyanonickelate (II) ION.
Discussion
624.

van't Hoff factor of 0.1 molal CaCl_2 solution will be (Assume CaCl_2 dissociates completely in solution)

Answer»

2
4
1
3

Answer :D
Discussion
625.

Which of the following is used as dyr cleaning ?

Answer»

`CHCl_(3)`
`CH_(2)Cl_(2)`
`C Cl_(4)`
`CHl_(3)`

Answer :C
Discussion
626.

The resistance of 0.1 N solution of formic acid is 200 ohm and cell constant is 2.0cm^(-2). The equivalent conductivity (in Scm^(2)eg^(-1)) of 0.1 N formic acid is 1.0 xx 10^(x) , x is

Answer»


Solution :`R = S . (1)/(A) IMPLIES K =(1)/(S) = (2)/(200) = 10^(-2) , ^^_(e) = K xx (1000)/(N) = 10^(-2) xx (1000)/(10^(-1)) = 10^(2)`
Discussion
627.

Which of the following halides cannot be hydrolysed at room temperature? (I) TeF_(6) (II) SF_(6) (III) NCl_(3) (IV) NF_(3) Choose the correct code:

Answer»

III and IV
I,II and III
I, II and IV
II and IV

Answer :D
Discussion
628.

The term 'sorption' stands for ______ .

Answer»

ABSORPTION
ADSORPTION
both absorption and adsorption
desorption

SOLUTION :both absorption and adsorption
Discussion
629.

Write reaction and conditions for the following conversions : (i) 2 - Propanone into 2 - methyl -2- propanol. (ii) n-Propyl alcohol into hexane.

Answer»

Solution :Reaction and conditions for the conversions are given below :
(i) 2 - Propanone to 2 - methtyl-2- propanol :

(ii) N - Propyl alcohol a HEXANE :
`underset("n - propyl alcohol")(CH_(3)CH_(2)CH_(2)OH)+PCl_(5)rarr underset("1 - chloropropane")(CH_(3)CH_(2)CH_(2)Cl)+POCl_(3)+HCL`
`underset("1 - Chloropropane")(2CH_(3)CH_(2)CH_(2)Cl)+2Na underset(underset("WURTZ reaction")("ether"))overset("Dry")rarr underset("n - Hexane")(CH_(3)CH_(2)CH_(2)CH_(2)CH_(2)CH_(3))+2NaCl`
Discussion
630.

Which of the following is obtained on treating phenol with conc. HNO_(3)//H_(2)SO_(4) mixture ?

Answer»




NONE of these

Solution :
Discussion
631.

Which of the following can be remelted time and again without producting any change?

Answer»

THERMOSETTING polymers
Thermoplastic polymers
Bakelite
Melamine

Answer :B
Discussion
632.

The reagent which can be used to distinguish acetophenone from benzophenone is

Answer»

2,4- dinitrophenylhydrazine
aqueous solution of `NaHSO_3`
benedict reagent
`I_2` and `Na_2CO_3`

Solution :`I_2` and `Na_2CO_3` REACT with acetophenone `(C_6H_5COCH_3)` to give yellow ppt. of `CHI_3` but benzophenonone `(C_6H_5COC_6H_5)` does not and HENCE can be USED to distinguish between them.
Discussion
633.

To a solutionof a substance gradiual addition of ammoniumhydroxideresult in a black precipitate whichdoes notdissolve in excess of NH_(4)OH however when HCI is added to the original solution a white precipitate isformed .The solutioncontained

Answer»

LEAD salt
Silver salt
Mercurous salt
Copper salt

Solution :`HgCI_(2)` is white insoluble salt
`Hg_(2)CI_(2)+2NH_(4)OH rarr ubrace(Hg+HgO.Hg(NH_(2))CI)_("Black")`
`+NH_(4)CI +2H_(2)O`
Discussion
634.

The volume of a colloidal particle, V_C cas compared to the volume of a solute particle in a true solution V_S could be

Answer»

`(V_C)/(V_S) ~= 10^3`
`(V_C)/(V_S)~= 10^(-3)`
`(V_C)/(V_S) ~= 10^(23)`
`(V_C)/(V_S) ~= 1`

Solution :The size of a colloidal particle is about 10 TIMES(say r=10) that of SOLUTE particle in a TURES solution. Hence, the volume of a collaoidal particle `(V_C)` is `10^(3)` = 1000 times `(V prop r^3)` that of the solute partice in a true solution `(V_S)`
`therefore V_(C) prop 10^3`
`V_S prop 1`
Hence, `(V_C)/(V_s) ~= 10^3`
Discussion
635.

Write structures of the following: (1) Hept - 5 ene - 1 - yne (2) 1 - bromo - 2 ethoxyethane (3) 3 - chloropropanoyl bromide (4) 1 - chloropropan - 2 - amine (5) 4 - iodo - 3 - nitrobutanal (6) 3 - phenylprop - 2 enoic acid (7) Ethanoic methanoic anhydride (8) 2 - carbomyl - propanoic acid (9) Pentane - 2,4 - dione (10) 5 - formyl - 3 -oxopentanoic acid (11) tert - butyl alcohol (13) Trimethylacetic acid (14) Diethyl - butane - 1,4 diaote (15) 3 - (carboxymethyl) pentane - dioic acid (16) 1,3 - dimethylcyclohex - 1 - ene

Answer»

Solution :(1) `HC-=C-CH_(2)CH_(2)=CHCH_(3)` <BR> (2) `CH_(3)CH_(2)OCH_(2)CH_(2)Br`
(3) `CICH _(2)CH_(2)COBr`
(4) `CH_(3)-overset(NH_(2))overset(|)(CH)-CH_(2)CI`
(5) `ICH_(2)overset(NO_(2))overset(|)(CHCH_(2))CHO`
(6) `C_(6)H_(5)CH=CH_(2)CI`
(7) `HCO-O-COCH_(3)`
(8) `CH_(3)-overset(CONH_(2))overset(|)(CH)-COOH`
(9) `CH_(3)COCH_(2)COCH_(3)`
(10) `OHC CH_(2)CH_(2)COCH_(2)COOH`
(11) `(CH_(3))_(3)C-OH`
(12) `HOOC-CH=CH-COOH`
(13) `(CH_(3))_(3)C-COOH`
(14) `H_(5)C_(2)OOCH_(2)COOC_(2)H_(5)`
(15) `HOOC CH_(2)overset(CH_(2)COOCH)overset(|)(CHCH_(2))COOH`
(16)
Discussion
636.

The wave length of a beam of light is 25.0m m. Its wave number is

Answer»

`4.0xx10^(1)m^(-1)`
`4.0xx10^(6)CM^(-1)`
`4.0xx10^(6)m^(-1)`
`25.0xx10^(4)cm^(-1)`

Solution :`barv=1/(lamda)=1/(25xx10^(-6))=4.0xx10^(4)m^(-1)`
`=4.0xx10^(2)cm^(-1)`
Discussion
637.

When a ketone is condensed into an ketol, the reagent used is

Answer»

`Na_(2)CO_(3)`
`NaHCO_(3)`
`Br_(2) ` WATER
`Cl_(2)`

ANSWER :A
Discussion
638.

What are polysaccharides ? Give one example.

Answer»

SOLUTION :Polysaccharides on hydrolysis GIVE a large number of molecules of monosaccharides. For EXAMPLE, starch or CELLULOSE.
Discussion
639.

Which of the followingcomplex isformed when A reacts with K_(4)[Fe(CN)_(6)]?

Answer»

PRUSSIAN blue
Turnbull's blue
Brown RING complex
Sodium mitroprusside

Solution :N//A
Discussion
640.

Which of the following are correct A) T_3 >T_2 > T_1 B) At fixed pressure there is decrease in physical adsorption with decreases in temperature. C) At high pressure there is saturation of adsorption

Answer»

A, B &C 
A & B Only 
B & C only 
A & C Only

Solution :`T uarr` physical ADSORPTION `darr T_3 >T_2 >T_1`
At high pressure EQUILIBRIUM EXIST both adsorption & deadsorption
Discussion
641.

Which of the following are the advantages of using oxygen in place of air in steel industry?

Answer»

In gives more PURE product
The SURFACE is free from nitrides.
It MAKES the procedure faster i.e., more production
Larger QUANTITIES can also be handled.

Answer :A::B::C
Discussion
642.

Which among the following gives positive iodoform test as well as positive Fehling test ?

Answer»

Propanal
Ethanal
Propanone
Acetophenone

Answer :B
Discussion
643.

Which mixture is separated by conc. Aqueous solution of sodium hydroxide:-

Answer»

`AL^(3+) and Sn^(2+)`
`Al^(3+) and Fe^(3+)`
`Al^(3+) and Zn^(2+)`
`Zn^(2+) and Pb^(2+)`

ANSWER :B
Discussion
644.

Which of the following is / are the characteristic properties of SN^2reaction

Answer»

Follows second order KINETICS
Rearreangements do not occur
Inversion of configuration takes PLACE
Order of reactions of HALIDES `1^@ gt 2^@ gt 3^@`

SOLUTION :Conceptual more
Discussion
645.

Which one of the following has highest bond energy

Answer»

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

Answer :B
Discussion
646.

Which one of the following is known as arrhenius equation ?

Answer»

`k=Ae^(-((E_a)/(RT)))`
`k=Ae^(((E_a)/(RT)))`
`k=Ae^(-((RT)/E_a))`
`k=Ae^(-((RT)/E_a))`

ANSWER :A
Discussion
647.

The term that accounts for intermolecular force in van der Waals' equation for non ideal gas is :

Answer»

<P>RT
V-b
`(P + (a)/(V^2))`
`[RT]^(-1)`

ANSWER :C
Discussion
648.

Which of the following structure (s) is/are meso 2,3 butanediol?

Answer»




SOLUTION :`{:(Bto2R,3S),(Cto2R,3S):}}` Both are MESO
Discussion
649.

Vinylcarbinol is

Answer»

`HO-CH_(2)-CH=CH_(2)`
`CH_(2)C(OH)+CH_(2)`
`CH_(3)-CH=CH-OH`
`CH_(3)-C(CH_(2)OH)=CH_(2)`

Solution :Carbinal is METHYL alcohol `(CH_(3)OH)`, hence VINYLCARBINOL should be `overset(3)(CH_(2))=overset(2)(CH)overset(1)(CH_(2))-OH` prop-2-enol
Discussion
650.

Today the concentration of green house gases is very his because of

Answer»

USE of refrigerator
Increased COMBUSTION of OILS and coal
Deforestation
All of the above

Answer :D
Discussion