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22751.

Two volumes of ammonia, on dissociation gave one volume of nitrogen and three volumes of hydrogen. How much hydrogen will be obtained from the dissociation of 10 litre of NH_(3)?

Answer»

30 LITRE
10 litre
15 litre
20 litre.

ANSWER :C
Discussion
22752.

Which set of reagents will produce CCl_2F_2:

Answer»

`C+F_2+Cl_2`
`CH_3Cl+F_2`
`CCl_4+HF OVERSET(SbCl_5)RARR`
`CCl_4+F_2 rarr`

ANSWER :C
Discussion
22753.

The total number of bond pairs and lone pairs in Se_(2)Br_(2) molecule are respectively

Answer»

3, 10
3, 8
2, 6
2, 10

ANSWER :A
Discussion
22754.

What is the Ph of a solution obtained by mixing 10 ml of 0.1 M HCl and 40 ml of 0.2M H_2SO_4?

Answer»

1.4865
0.4865
0.4685
3

Answer :C
Discussion
22755.

Which of the following enhances lathering property of soap ?

Answer»

SODIUM carbonate
Sodium rosinate
Sodium stearate
Trisodium phosphate

Solution :Sodium rosinate ENHANCES the LATHERING PROPERTY of SOAP.
Discussion
22756.

Which order are correct? (I) Thermal stability : BeSO_(4)ltMgSO_(4)ltCaSO_(4)ltSrSO_(4)ltBaSO_(4) (II) Basic nature : ZnOgtBeOgtMgOgtCaO (III) Solubility in water : LiOHgtNaOHgtKOHgtRbOHgtCsOH (IV)Melting point : NaClgtKClgtRbClgtCaClgtLiCl

Answer»

(I), (IV)
(I), (II) and (IV)
(II), (III)
All correct

Answer :A
Discussion
22757.

Which amine yields N-nitroso amine after treatment with nitrous acid?

Answer»




ANSWER :C
Discussion
22758.

Which is not an ore of leads ?

Answer»

Galena
Cassiterite
Anglesite
Cerussite

Answer :B
Discussion
22759.

Which of the following does not exit as a zwitter ion ?

Answer»

GLYCINE
ALANINE
Sulphanilic ACID
PICRIC acid

Answer :D
Discussion
22760.

Which of the following does not form precipitate with AgNO_3 ?

Answer»

HF
HCl
HBr
HI

Answer :A
Discussion
22761.

Write structures of the product of the following reactions : (i) CH_(3)-CH=CH_(2)overset(H_(2)O //H^(+))rarr (iii) CH_(3)-CH_(2)-underset(CH_(3))underset("|")"CH"-CHOoverset(NaBH_(4))rarr

Answer»

SOLUTION :
(III) The `-CHO` group is reduced to `CH_(2)OH`
`UNDERSET("2 - Methylbutanal")(CH_(3)-CH_(2)-underset(CH_(3))underset("|")"CH"-CHO)OVERSET(NaBH_(4))RARR underset("2-Methylbutan-1-ol")(CH_(3)-CH_(2)-underset(CH_(3))underset("|")"CH"-CH_(2)OH)`
Discussion
22762.

Why are haloarenes more stable than haloalkanes and undergo electrophilic substitution reaction at ortho and para-positions ?

Answer»

Solution :Haloarenes are resonance hybrid of FOLLOWING five structures:

Since there are five resonating structures in haloarenes, THEREFORE, they are more STABLE than HALOALKANES. Electrophilic substitution will take place at o- and p-positions because there is negative charge at o- and p-positions.
Discussion
22763.

Which acid is obtained by dissolving P_(4)O_(6)in water ?

Answer»

`H_(3)PO_(2)`
`H_(3)PO_(3)`
`H_(3)PO_(4)`
`H_(4)P_(2)O_(7)`

Answer :B
Discussion
22764.

Two volumes of ammonia , on dissociation gave one volume of nitrogen and three volumes of hydrogen. How much hydrogen will be obtained from dissociation of 40mL of NH_(3)?

Answer»


ANSWER :60ML
Discussion
22765.

Which of the following reaction, does not give chloro benzene as a product ?

Answer»




SOLUTION :(d) `CHFClBroverset(OH^(Θ))RARR,CFCL("CARBENE")`
Discussion
22766.

Which of the following compounds gives gye test?

Answer»

Aniline
Methylamine
Diphenylamine
Ethylamine

Answer :A
Discussion
22767.

Which of the following reagents can not be used to distinguish between glucose and fructose?

Answer»

TOLLENS' REAGENT 
FEHLING's solution 
Benedict's solution 
All of these

Answer :D
Discussion
22768.

Write the structures of the major organic product in each of the following: CH_3CH=C(CH_3)_2 + HBr rarr.

Answer»

SOLUTION :`CH_3-CH_2-UNDERSET(BR)underset(|)OVERSET(CH_3)overset(|)(C )-CH_3`
Discussion
22769.

Which of the following statements is correct according to the basic concepts of thermodynamics which govern the feasibility of a metallurgical process ?

Answer»

When the value of `DeltaG` is POSITIVE for the EQUATION `DeltaG=DeltaH-T DeltaS`, the reaction will proceed.
If reactant and products of two reactions are put TOGETHER and net `DeltaG` is -ve , the OVERALL reaction with occur.
On increasing the temperature , the value of `DeltaG` reaction will occur.
Feasibility of thermal oxidation of an ore can be established by Ellingham DIAGRAM in which a straight line shows the reduction will proceed.

Answer :B
Discussion
22770.

Which of the following is/are true about colloidal solution?

Answer»

It is homogeneous SOLUTION
It does not DIFFUSE
Size of the particles is between `10^(-9) 10^(-7)cm`
SHOW Tyndall effect

Answer :D
Discussion
22771.

Which of the following is poison?

Answer»

`HgCl_2`
`BaSO_4`
`HgCl_2`
`NaHCO_3`

ANSWER :C
Discussion
22772.

Three compounds I, II, and III are given. (I) (II)(III) The compounds (A), (B) and (C ), respectively, are:

Answer»

I, II, and III
I, III, and II
II, I, and III
II, III, and I.

Solution :`B_(2)H_(6)//THF` also reduces `(C==O)` group to `(-CHOH)` group and `(-COOH)` group to `(CH_(2)OH)`, alolng with reacting at `(C=C)` bond to FORM alcohol (anti-Markovnikov's rule).
Discussion
22773.

Which of the following is not an alpha-amino acid?

Answer»

`UNDERSET(NH_2)underset(|)CH_2-COOH`
`H_3C-underset(NH_2)underset(|)CH-COOH`

`H_3C-underset(NH_2)underset(|)CH-CH_2COOH`

ANSWER :D
Discussion
22774.

The soldiers of Napolean army while at Alps during freezing winter suffered a serious problem as regards to the tin buttons of their uniforms. White metallic tin buttoms got converted to grey powder. This transformation is related to

Answer»

a change in the partial pressure of oxygen in the air
a change of the crystalline STRUCTURE of tin
an INTERACTION with nitrogen of the air at very low temperature
an interaction with water VAPOUR contained in the humid

Solution :Grey tin `harr` White tin
Grey tin is brittle and crumbles down to powder in very cold climate. ltbr. The CONVERSION of grey tin to white tin is accopained by increase in volume,this is known as tin plaque or tin disease.
Discussion
22775.

Write the anode, cathode and electrolyte of lead storage battery.

Answer»

Solution :(i) Anode : Spongy lead
(II) CATHODE : Lead plate bearing `PbO_(2)`
(III) Electrolyte : 38% by mass of `H_(2)SO_(4)` with density 1.2 g/mL.
Discussion
22776.

Which one of following types of drugs reduces fever ?

Answer»

Analgesics
Antipyretics
Aspirin
Tranquillizers 

ANSWER :A
Discussion
22777.

Which of the following metals has the largest abundance in the earth's crust?

Answer»

Aluminium
calcium
Magnesium
sodium

Answer :A
Discussion
22778.

Which primitive cell has equal edge lengths (a= b= c)and all axial angles equal but different from 90 ^(@) ?

Answer»

TRICLINIC
TRIGONAL
MONOCLINIC
Hexagonal

ANSWER :B
Discussion
22779.

When Zn reacts with very dilute nitric acid it produces:

Answer»

NO
`NH_4NO_3`
`NO_2`
`H_2`

ANSWER :B
Discussion
22780.

Which of the following is used in indigestion?

Answer»

`AI(OH)_(3)`
`SO_(2)`
brine
`CH_(3)COOH`

ANSWER :A
Discussion
22781.

The two forms of D-Glucopyranose are called

Answer»

Isomer
Anomer
Epimer
Enantiomer.

Answer :B
Discussion
22782.

When a mixture of ammonium chloride and potassium dichromate was heated, a stable colurless gas (A) was evolved which did not support combustion, but magnesium continued to burn in it. The gas (A) reacted with calcium carbide in an electric furnance forming a solid (B) which was slowly hydrolysed by water forming an insoluble substance (C) and the solution of a substance (D) which turned Nessler's reagent brown. Identify substances (A) to (E) and explain all the reactions involved.

Answer»

SOLUTION :(i) `2 NH_(4)CL + K_(2)Cr_(2)O_(7) rarr UNDERSET("Amm. dichromate")((NH_(4))_(2)Cr_(2)O_(7)) + 2 KCl`
(ii) `(NH_(4))_(2)Cr_(2)O_(7) overset("Heat")(rarr) underset(("A"))(N_(2)) + Cr_(2)O_(3) + 4 H_(2)O`
(iii) `3 Mg + N_(2) overset(Delta)(rarr) underset("MAGNESIUM nitride")(Mg_(3)N_(2))`
(iv) `underset("Calcium carbide")(CaC_(2))+N_(2) overset("Heat")(rarr) underset("Cal. cyanamide (B)")(CaCN_(2)) + C`
(v) `underset((B))(CaCN_(2))+3H_(2)O rarr underset("Cal. carbonate (C)")(CaCO_(3)) + underset("Ammonia (D)")(2NH_(3))`
(vi) For reaction with Nessler's reagent, refer to Eq. (i), P-5 above.
Discussion
22783.

Wurtzreactionis used toprepare :

Answer»

methaneonly
symmertricalalkaness
unsymmetrical ALKANES
all of these

Answer :B
Discussion
22784.

Zn+2H^(+)toZn^(2+)+H_(2) Half-life period is independent of concentration of zinc at constant pH. For the constant concentraio of Zn, rate becomes 100 times when pH is decreased from 3 "to" 2. Hence,

Answer»

`(dx)/(DT)=k[XN]^(0)[H^(+)]^(2)`
`((dx)/(dt))=k[Zn][H^(+)]^(2)`
rate is not affected if connentration of zinc is made fourn TIMES and that of `H^(+)` ion is halved
rate becomes FOUR times if concentration of `H^(+)` ions is doubled at CONSTANT Zn concentration.

Answer :B::C::D
Discussion
22785.

Toluene reacts with chlorine in the presence of light to give

Answer»

BENZYL CHLORIDE
free-radical substitution
side CHAIN substitution
ring substitution

Answer :(A, B,C)
Discussion
22786.

When dipped in conc. HNO_3, metals like iron, chromium, nickel, aluminium, base become passive. This is due to

Answer»

REDUCTION of metals
formation of corresponding nitrates
evolution of NITROGEN dioxide
formation of LAYER of metal OXIDE on the SURFACE of metal

Answer :D
Discussion
22787.

When propyne is treated with aqueous H_(2)SO_(4) in presence of HgSO_(4), the major product is

Answer»

Propanal
Propyl HYDROGEN sulphate
ACETONE
Propanol

ANSWER :C
Discussion
22788.

Which of the following compounds gives red ppt with Cu_(2)Cl_(2)//NH_(4)OH ?

Answer»

`CH_(3)-C-=C-CH_(3)`
`CH_(3)-CH_(2)-C-=CH`
`CH_(3)-CH_(2)-CH=CH_(2)`
`CH_(3)-C-=C-CH=CH_(2)`

SOLUTION :N//A
Discussion
22789.

What is heterogeneous catalysis ? Give an example.

Answer»

Solution :Hetergenous CATALYST : when the catalyst is in different phase than the REACTANT,L it is called heterogenceous catalyst, eg.`k=1/iIn([R])_0/([R])` x/mk.`p^(1/n)`, where (n>1).
Discussion
22790.

What is the action of gention voilet ?

Answer»

SOLUTION :Disingectant.
Discussion
22791.

Which site of an enzyme is called allosteric site ?

Answer»

Solution :Sites different from ACTIVE site of ENZYME where a molecule can bind and affect the active site is called allosteric site. Some DRUGS MAY ALSO bind at this site.
Discussion
22792.

Which pair gives Cl_2 at room temperature:

Answer»

CONC. HCL + `KMnO_4 `
NACL + `Conc.H_2SO_4`
NaCl + `MnO_2`
NaCl + Conc.`HNO_3`

ANSWER :A
Discussion
22793.

Which of the following nitrate gives off different nitrogen oxide then rest of the other nitrates here?

Answer»

LITHIUM NITRATE
LEAD nitrate
BARIUM nitrate
AMMONIUM nitrate

Answer :D
Discussion
22794.

which of the following is the correct expression for a Heisenberg's uncertainty principle?

Answer»

`DELTAX`. `Deltap GE h/4π`
`Deltax. Deltap ge h/2π`
`Deltax. Deltap le h/4π`
`Deltax. Deltap =h/(sqrt2π)`

ANSWER :A
Discussion
22795.

What are the molecular and formula mass of Potash alumn respectively ?

Answer»

950, 480
948, 474
474, 948
480, 950

ANSWER :B
Discussion
22796.

which of the following reactions will not have fractional order for A_(2) or B_(2)?

Answer»

`A_(2)hArr,A+A("fast")`
`A+B_(2)hArrAB+B("SLOW")`
`A+BhArrAB("fast")`
`A_(2)hArrC("slow")`
`C+B_(2)hArrd("fast")`
`D+A_(2)hArr"PRODUCTS"`
`B_(2)hArrB+B("fast")`
`A_(2)+BghArrAB+B("fast")`
`ABhArr"Products"`
All have FRACTIONAL, order

Answer :B
Discussion
22797.

Which is the least effective substance for the coagulation of Fe(OH)_(3) colloid ?

Answer»

`K_(4)[FE(CN)_(6)]`
`K_(3)PO_(4)`
`KBR`
`K_(2)SO_(4)`

Answer :A
Discussion
22798.

Which of the following atoms could form an anion with -2 charge?

Answer»

Se
Po
Cl
H

Solution : Check the position of ‘POLONIUM’ in the periodic table. ‘Po’ shows +6, +4, +2, –2 STATES in general but majorly it shows +4 state. It is considered to be a METALLOID with PROPERTIES SIMILAR to Tellurium and Bismuth.
Discussion
22799.

The reason for increase in electrical conduction of electrolyte with increase in temperature is A) increase in the number of ions B) increase in the speed of ions C) increase in the degree of dissociation of electrolyte

Answer»

A, B only
B,C only
A,C only
A, B,C
Discussion
22800.

The unit ohm^(-1) is used for

Answer»

Molar conductivity
Equivalent conductivity
Specific conductivity
Conductivity

Solution :CONDUCTANCE`=(1)/("resistance")=(1)/(OHM)=ohm^(-1)` or MHO.
Discussion