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13701.

Which of the following salt will have same value of Van't Hoff's factor [i] as that of K_4[Fe(CN)_6]

Answer»

`Al_2(SO_4)_3`
NACL
`AL(NO_3)_3`
`Na_2SO_4`

ANSWER :A
Discussion
13702.

What happens when nitromethane reacts with acetaldehyde ?

Answer»

SOLUTION :`CH_3CHO+CH_3NO_2 RARR CH_3CHOH-CH_2NO_2`
Discussion
13703.

Which of the following represents hydrolysis

Answer»

`HCO_(3)^(-) + H_(2)O hArr CO_(3)^(2-) + H_(3)O^(+)`
`HCO_(3)^(-) + H_(2)O hArr H_(2)CO_(3) + OH^(-)`
`H_(3)BO_(3) + H_(2)O hArr H_(2)BO_(3)^(-) + H_(3)O^(+)`
`H_(2)PO_(4)^(-) + H_(2)O hArr HPO_(4)^(2-) + H_(3)O^(+)`

Solution :Reaction (B) SHOWS hydrolysis.
Discussion
13704.

Which is the sweetest substance ?

Answer»

Aspartame
Saccharin
Alitame
Sucralose 

ANSWER :C
Discussion
13705.

Why are rubber called elastomers ?

Answer»

SOLUTION :They CHANGE their shape on applying FORCE and REGAIN their original shape on removal of the applied force. Hence, rubbers are called elastomers.
Discussion
13706.

Which of the following is not used in rocket propellants

Answer»

`N_(2)H_(4)(I)`
`O_(2)(I)`
Methane
`H_(2)(I)`

Solution :Methane is not USED as a rocket propellant.
Discussion
13707.

Which of the following has higher vapour pressure at the same temperature ?CH_3OH(BP=64.5^@C) andC_2H_5OH(BP=78.3^@C

Answer»

Solution :`CH_3OH` having LOWER B.P shows higher VAPOUR PRESSURE .
Discussion
13708.

Write the name or formula of the following: A mixed ether

Answer»

SOLUTION :`C_2H_5-OCH_3` : ETHYL METHYL ETHER
Discussion
13709.

Which of the following statement about primary amine is false :

Answer»

Aryl amines react with NITROUS acid to produce phenol
Alkylamines are stronger base than ammonia
Alkyl amines are STRINGER base than aryl amines
Alkyl amines react with nitrous acid to produce alcohol

Answer :A
Discussion
13710.

Which of the following is thecorrect order in which metals displace each other from the salt solution of their salts?

Answer»

ZN,AL,Mg,Fe,Cu
Cu,Fe,Mg,Al,Zn
Mg,Al,Zn,Fe,Cu
Al,Mg,Fe,Cu,Zn

Solution :In reactivity series , Mg gt Al gt Zn gt Fe gt Cu `OVERSET"Reactivity decreases"to ` Hence, Mg can displace Al, Al can displace Zn and so on.
Discussion
13711.

Write the structures of the following compounds (i) alpha-Methoxypropionaldehyde

Answer»


ANSWER :`(##ANE_PKE_CHE_XII_C12_E01_001_S01##)`
Discussion
13712.

When an acidified solution of Na_2MoO_n (atomic mass of Moi=36) is electrolyzed, O_2 gas is liberated corresponding to a volume of 0.112 L at STP and mass of Mo deposited is 0.32 g. Then the formula of the salt and oxidation state of Mo is

Answer»

`Na_2MoO`,0
`Na_2MoO_4`,+6
`Na_2MoO_2`,+2
`Na_2MoO_3`,+4

Answer :B
Discussion
13713.

Which one among the following is the strongest oxidizing agent ? ClO_(4)^(-), BrO_(4)^(-), IO_(4)^(-).

Answer»

Solution :AMONGST `ClO_(4)^(-) (E^(@) = + 1.19 V), BrO_(4)^(-) (E^(@) = + 1.74 V) and IO_(4)^(-) (E^(@) = + 1.65 V), BrO_(4)^(-)` has the highest electrode potential and HENCE it is the strongest oxidising agent.
Discussion
13714.

What is the function of diethyl ether in Grignards reagent preparation (1) to act as a catalyst (2) to act as a solvent (3) to provide lone pair electron to co-ordination (4) to act as an acid

Answer»

1, 2
2, 3
3, 4
2, 4

Answer :B
Discussion
13715.

Which is the hardest element ?

Answer»

Iron
Silicon
Diamond
Aluminium

Answer :C
Discussion
13716.

Which can exist in optically active form?

Answer»

1-Butanol
2-Butanol
3-Pentanol
4-Heptanol

Answer :B
Discussion
13717.

Use Hund's rule to derive the electronic configuration of Ce^(3+) ion, and calculate its magnetic moment on the basis of spin-only formula

Answer»

SOLUTION :The electronic configuration of `Ce^(3+) " is" 4f^(1)`
`:. mu= SQRT(n(n+2)) = sqrt(1(1+2)) = SQRT3 = 1.73` BM
Discussion
13718.

The structural formula of 2-butanol is _______.

Answer»

SOLUTION :`CH_3-CH_2-CH_2-CH_2OH`
Discussion
13719.

The species which can best serve as an initiator for the cationic polymerisation is :

Answer»

BALI
`LiAlH_4`
`HNO_3`
`AlCl_3`

ANSWER :D
Discussion
13720.

Which of the following reaction give primary amine

Answer»

`CH_(3)CH_(2)CONH_(2)overset(LiAlH_(4))to`
`CH_(3)CH_(2)NC overset(NA&C_(2)H_(5)OH)to`
`CH_(3)CONHCH_(3)overset(LiAlH_(4))to`
`CH_(3)CH_(2)CN overset(H_(3)O^(+))to`

Solution :`CH_(3)CH_(2)-CH_(2)-NH_(2)overset(LiAlH4)larr CH_(3)-CH_(2)-CONH_(2)`
Discussion
13721.

Which of the following reactions of glucose can be explained only by its cyclic structure?

Answer»

GLUCOSE forms pentaacetate
Glucose REACTS with hydroxylamine to FORM an OXIME
Pentaacetate of glucose does not react with hydroxylamine
Glucose is oxidised by nitric acid to gluconic acid

Solution : Pentaacetate of glucose does not react with hydroxylamine.
Discussion
13722.

Write the important structural and functional differences between DNA and RNA .

Answer»

SOLUTION :
Discussion
13723.

Which of the following show amphoteric behaviour ?

Answer»

`ZN(OH)_(2)`
`BeO`
`Al_(2)O_(3)`
`Pb (OH)_(2)`

Answer :A::B::C::D
Discussion
13724.

Which of the following is the uppermost region of the atmosphere?

Answer»

Stratosphere
Troposphere
EXOSPHERE
Ionosphere

SOLUTION :Exosphere
Discussion
13725.

Use of chlorofluoro carbon is not encouraged because

Answer»

They are harmful to the eyes of people that use it
They damage the refrigirators and air conditioners
They eat away the ozone I thhe atmopshere
they destroy the oxygen layer

Solution :CHLOROFLUOROCARBON isused in air-conditioners and in domestic refrigerators for cooling purpose. Its MAIN drawback is this, it is RESPONSIBLE for ozone depletion.
Discussion
13726.

Write the relation between cell potential and equilibrium constant.

Answer»

SOLUTION : `E_("CELL") = E_("cell") - LOG K_c`
Discussion
13727.

Tritium atom has :

Answer»

Two neutrons and one proton
One NEUTRON and two PROTONS
Two neutrons and two protons
None of these

Answer :A
Discussion
13728.

What will be the action of the mixture of sodium nitrite and dilute hydrochloric acid on : (a ) Ethyl amine (b ) Aniline (c ) Triethyl amine

Answer»

SOLUTION :Ethyl amines on reaction with the mixtiure of sodium nitrie and dilute with the mixture of sodium NITRITE and dilute hydrochloric acid gives ethyl alcohol and noitrogen gas :

(B ) Anilineon reaction with the mixture of sodium nitrite and hydrochloric acid gives diazonium salt .

Triethyl amine reacts with the mixture of sodium nitrie and dilute acid to GIVE triethyl ammonium nitrite .
Discussion
13729.

Which of the following is a chain growth polymer

Answer»

NUCLEIC ACID
POLYSTYRENE
Protein
Styrene

Answer :B
Discussion
13730.

Which gives blood red colour with ammonium thiocyanate

Answer»

`Fe^(+3)`
`Fe^(+2)`
`CU^(+2)`
`CD^(+2)`

Answer :A
Discussion
13731.

Which method is used to prepare mercury colloid?

Answer»

peptisation
mechanical DISPERSION
ULTRASONIC dispersion
Bredig's ARC METHOD

SOLUTION :ultrasonic dispersion
Discussion
13732.

Which vitamin is required for Xerophthalima ?

Answer»

`B_(2)`
A
E
C

ANSWER :B
Discussion
13733.

Time required for completion of ionic reactions in comparison to molecular reaction is

Answer»

Maximum
MINIMUM
Equal
None

Solution :IONIC REACTIONS are very FAST reactions i.e. TAKES place instantaneously .
Discussion
13734.

When 20 g of CaCO_3 were put into 10 litre flask and heated to 800^Oc 35% CaCO_3 remained unreacted at equillibrium . Predict k_p for decomposition of CaCO_3 .

Answer»

1.145 atm
0.145 atm
2.145 atm
3.145 atm

Answer :A
Discussion
13735.

What is leaching ? Glve an example.

Answer»

SOLUTION :Principle - When Ore is SOLUBLE and impurities are INSOLUBLE in a suitable solvent , then ore is concentrated by leaching method , a chemical method of SEPRATION .
EXAMPLES - Bauxite `(Al_2O_3. 2H_2O)` ,an ore of a aluminium is concentrated by leaching method.
Discussion
13736.

Write the. name or formula of oxo acid of chlorine, in which chlorine has oxidation number +7

Answer»

SOLUTION :`HClO_4` PERCHLORIC ACID or CHLORIC (VII) acid
Discussion
13737.

What is the vapour pressure of the solution prepared by dissolving 0.5 gram substance (Molecular weight 65) in 100 mL C Cl_(4) ? The vapour pressure of C Cl_(4) is 143 mm. density of C C_(4) is 1.58.

Answer»

143.99 mm
94.39 mm
141.97 mm
199.34 mm

SOLUTION :`w_(B)=0.5` gram
`w_(A)=` volume `xx` DENSITY
`=100xx1.58=158` gram `C Cl_(4)`
`M_(B)=65` gram/volume
`M_(A)=154` gram/volume
`(p^(@)-p)/(p^(@))=(w_(B).M_(A))/(w_(A).M_(B))=(0.5xx154)/(158xx65)`
`therefore p=141.97` gram.
Discussion
13738.

What is physical adsorption? Give example.

Answer»

Solution :PHYSCIAL adsorption is a process in which ADSORBATE are attached to adsorbent by MEANS of WEAK van der Waals forces of ATTRACTION.
e.g., (i) Adsorption of `N_(2)` on mica (ii) Adsorption of gases on charcoal.
Discussion
13739.

What is (Z) is the following sequence of reaction? HC-=CH overset((i)2NaNH_(2)(ii) 2CH_(3)I)rarr (X) overset(HgSO_(4),H_(2)SO_(4))rarr(Y) overset((i)NaOH+Br_(3)(ii)H_(3O^(+)))rarr (Z)

Answer»

`CH_(3)CH_(2)CH_(2)CHO`
`CH_(3)CH_(2)COCH_(3)`
`CH_(3)CH_(2)COOH`
`CH_(3)CH_(2)CH_(2)COOH`

ANSWER :C
Discussion
13740.

Write the structures of the following compounds :1-Chloro-4-ethylcyclohexane

Answer»

SOLUTION :1-Chloro-4-ethylcylohexane :
Discussion
13741.

Tyndall effect is shown by

Answer»

Sol
solution
plasma
precipitate

Solution :TYNDALL EFFECT is SHOW by SOLS
Discussion
13742.

The total possible co-ordination isomers for the following compounds respectively are : [Co(en)_(3)][Cr(C_(2)O_(4))_(3)] [Cu(NH_(3))_(4)][CuCl_(4)] [Ni(en)_(3)][Co(NO_(2))_(6)]

Answer»

4, 4, 4
2, 2, 2
2, 2, 4
4, 2, 4

Solution :`[OVERSET(+3)Co(en)_(3)][overset(+3)Cr(C_(2)O_(4))_(3)]`
`{:(,," "Co," "Cr),(,en rightarrow," "3," "0),(,," "2," "1),(,," "1," "2),(,," "0," "3):}`
`[overset(+2)Cu(NH_(3))_(4)][overset(+2)CuCl_(4)]`
`{:(,," "Cu," "Cu),(,NH_(3) rightarrow," "4," "0),(,," "3," "1):}`
`[overset(+3)Ni(en)_(3)][overset(+3)Co(NO_(2))_(6)]`
`{:(,," "Ni," "Co),(,en rightarrow," "3," "0),(,," "2," "1),(,," "0," "3),(,," "1," "2):}`
Discussion
13743.

Which silver halide is used in medicine

Answer»

`AgNO_(3)`
`AgCl`
`AGBR`
`AgF`

Solution :A very dilute solution is USED in causterisation of eyes and as a DENTAL ANTISEPTIC.
Discussion
13744.

Which one of the following is used in the purification of drinking water?

Answer»

silver SOL protected by gelatine
MILK of magnesia
Alum CONTAINING `AL^(3+)`
Argyrol

Solution :Alum containing `Al^(3+)`
Discussion
13745.

Whatis theconcentrationof dissolved oxygenat 25^(@) C at1 atomsphericpressure ifpartialpressureof oxygenis0.22 atm ?The Henry'slawconstantfor oxygenis 1.3 xx 10^(-3) mol dm^(-3) atm^(-1)

Answer»

Solution :`2. 86 XX 1^(-4)moldm^(-3)`
Discussion
13746.

Valium is used as

Answer»

tranquillizer
analgesic
antipyretic
antibiotic

Answer :A
Discussion
13747.

Which of the following forms maximum number of compounds?

Answer»

`NE`
`Kr`
`XE`
`Rn.`

ANSWER :C
Discussion
13748.

Which of the following compounds will react with metal by displacing the H - atom ?

Answer»

`CH_4`
`C_2H_4`
`C_2H_6`
`C_2H_2`

ANSWER :D
Discussion
13749.

Write the formula of copper hexacyanoferrate(II).

Answer»

SOLUTION :`Cu_(2)[Fe(CN)_(6)]`.
Discussion
13750.

Write the structure formula and IUPAC name of the following. (i)n-heptyl phenyl ether (i) Isopentyl phenyl ether (iii) Dimethyl glycolate

Answer»

SOLUTION :
Discussion