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20101.

The root mean square speed of the molecules of diatomic gas is u. When the temperature is doubled , the molecules dissociate into two atoms. The new rms speed of the atome is

Answer»

`sqrt(2u)`
U
2u
4u

Solution :`u = sqrt((3RT)/(M))`
If T = 2T and M = M/2 , then `u_(1) = sqrt((3 R XX 2T)/(M//2))`
`therefore (u_(1))/(u)= sqrt4 = 2`.
Discussion
20102.

Which pair of elements can form an alloy

Answer»

 `Zn + Pb`
`FE + Hg`
`C + Pt`
`Fe+C`

ANSWER :C
Discussion
20103.

Which of the following is correct combination ?

Answer»

(I) (i) (P)
(II) (iii) (P)
(III) (ii) (S)
(IV) (iv) (Q)

SOLUTION :N/A
Discussion
20104.

What will be the product of reaction ._(101)^(255)Md(alpha,2n)?

Answer»

`._(103)^(256)Lr`
`._(54)^(257)No`
`._(103)^(257)Lr`
`._(82)^(205)PB`

ANSWER :C
Discussion
20105.

Which of the following experimental methods is adopted to determine osmotic pressure ?

Answer»

Berkley-Hartley' s method
Beckmann's method
Landsberger's method
Differential method

Answer :A
Discussion
20106.

What is nature of hybridisation in XeF_4 ?

Answer»

SOLUTION :`sp^3 d^2` HYBRIDISATION
Discussion
20107.

Which of the following compounds can be used as antifreeze in automobile radiators ?

Answer»

METHYL alcohol
Glycol
NITROPHENOL
PHENOL

ANSWER :B
Discussion
20108.

Which of the following are not functional isomers of each other ?

Answer»

`CH_3CH_2NO_2` and `CH_3CH_2ON=O`
`C_2H_5CHO` and `CH_3COCH_3`
`CH_3CH-2CH_2` and `CH_30_2 cHNH_2`
` C_3H_7NH_2` and `(CH_3)_2 CHNH_2`

Solution :`1^@` AMINE to DIFFERENT `1^@` amines are not functionalisomers but `(1^@` and `2^@) (1^@` and `3^@)` and `(2^@` and `3^@)` of same molecular formula are fuctional isomers . Therfor E, (a) (B), and (c ) are functional isomers .
Discussion
20109.

Which of the following oxyacids of chlorine is formed on shaking chlorine water with freshly precipitated yellow oxide of mercury?

Answer»

`HClO_(3)`
`HClO_(2)`
`HCLO`
`HClO_(4)`

Answer :C
Discussion
20110.

When 1 mol of ethanol reacts with sodium metal liberate how many gram of hydrogen ?

Answer»

`1//2` gm of HYDROGEN
1 gm of hydrogen
1.5 gm of hydrogen
2 gm of hydrogen

ANSWER :B
Discussion
20111.

The standard reduction potential of Ag, Cu, Co and Zn are 0.799, 0.337,-0.277 and 0.762 V respectively. Which of the following cells will have maximum cell emf?

Answer»

`Zn|Zn^(2+) (1M) ||CU^(2+) (1M)|Cu`
`Zn|Zn^(2+)(1M )||Ag^(+)(1M )|Ag`
`Cu|Cu^(2+) (1M )||Ag^(+)(1 M)|Ag`
`Zn|Zn^(2+ )(1M)||Co^(2+) (1M ) | Co`

Solution :`E^@= E^@""_("cathode") - E^@ ""_("ANODE")`
` (a)E^@= 0.337- ( -0.762)=1.099V `
`(b)E^@= 0.799-( -0.762) = 1.561V `
` (c )E^@= 0.799- 0.337= 0.462V `
` (d )E^@=- 0.277-(-0.762) = 0.485 V `
Discussion
20112.

Which of the following have strong inter molecular H-bond ?

Answer»

METHYL HYDROXY benzaldehyde
PHENOL
Benzaldehyde
P-hydroxy benzaldehyde

Solution :Phenol
Discussion
20113.

Which will adsorb more gas, a lump of charcoal or its powder and why?

Answer»

SOLUTION :POWDERED charcoal will adsorb more gas because of its larger SURFACE AREA than a lump of charcoal
Discussion
20114.

Which of the following fibres are made of polyamides?

Answer»

Wool
Natural silk
Rayon
Nylon

ANSWER :A::B::D
Discussion
20115.

Which of the following reaction will give isopropanol ? Choose the right answer. (I) "Acetone" underset((ii)H_(2)O)overset((i)CH_(3)MgI)to(II) CH_(3)CHO underset((ii)H_(2)O)overset((i)CH_(3)Mgl)to (III) "2- Chloropropane" underset("Aq. NaOH")overset("Hydrolysis")to

Answer»

(I) & (II)
(II) & (IV)
(II) & (III)
(I), (II) & (IV)

Solution :
(iv) `UNDERSET("2-Chloropropane")(CH_(3)CHClCH_(3))+ NaOH_(aq) overset("Hydrolysis")to underset("Iso-propanol")(CH_(3)underset(OH)underset(|)CHOHCH_(3))`
Discussion
20116.

When water is added to quick lime, the reaction is

Answer»

EXOTHERMIC
Endothermic
Explosive
None of these

Solution :`CaO_((s))+H_(2)O_((L))rarrCa(OH)_(2)` is exothermic.
Discussion
20117.

What is Ellingham diagram?

Answer»

SOLUTION :PLOT of `TRIANGLEG VS T` for the formation of oxides of various metals is known as Ellingham diagram.
Discussion
20118.

Which of the following has fractional bond order ?

Answer»

`O_2^(2+)`
`O_2^(2-)`
`F_2^(2-)`
`H_2^-`

ANSWER :D
Discussion
20119.

When a colloidal solution is observed under an ultra microscope, we can see

Answer»

light SCATTERED by colloidal PARTICLES 
size of COLLIDAL particles 
SHAPE of the colloidal particles 
relative size of the colloidal particles 

Answer :A
Discussion
20120.

What happens when ethanol is heated with conc. H_(2)SO_(4) at 453 K ? Explain the mechansim of this reaction.

Answer»

Solution :When ETHANOL is heated with CONC. `H_(2)SO_(4)` at 453K, ethene is formed.
`CH_(#)CH_(2)OH overset("conc. "H_(2)SO_(4))underset(453K)RARR CH_(2)=CH_(2)+H_(2)O`
Mechanism of the reaction is explained as under :
`CH_(3)CH_(2) overset(* *)underset(* *)OH+H^(+)rarr CH_(3)CH_(2)overset(+)OH_(2)`
`CH_(3)CH_(2)overset(+)OH_(2)rarr underset("carbocation")underset("Ethyl")(CH_(3)overset(+)CH_(2))+H_(2)O`
Discussion
20121.

Which of the following is currently used as a tyre cord

Answer»

TERYLENE
POLYETHYLENE
BAKELITE
NYLON -6

Answer :D
Discussion
20122.

Why are aliphatic carboxylic acids stronger than phenols?

Answer»

Solution :The aliphatic carboxylic ACIDS are stronger acids than phenols. The difference in the relative acidic strengths can be understood if we compare the resonance hybrids of carboxylate ion and phenoxide ion.

The electron CHARGE in the carboxylate ion is more dispersed in comparison to the phenate ion SINCE there are two electronegative oxygen atoms in carboxylate ion as compared to only one oxygen atom in phenate ion. In other words, the carboxylate ion is RELATIVELY more stable as compared to phenate ion. Thus, the release of `H^(+)` ion from carboxylic ACID is comparatively easier or it behaves as a stronger acid than phenol.
Discussion
20123.

underset("(aq solu)")(Bbar(b))+Cl_(2) rarr underset("[Separated solution by passing air]")(Br_(2) + 2 bar(C ) I) The compound of Bromone which is added to petrol to act as lead scavenger

Answer»

1,2 di Bromoethane<BR>Bromo ETHANE
1,1,2,2 TETRA bromo ethane
None

Solution :1,2-dibromo ethane `(C_(2)H_(4)Br_(2))` ACT as lead savenger (atp knock)
Discussion
20124.

Which of the following has strong oxidising property?

Answer»

HBRO
`HBrO_(2)`
`HBrO_(3)`
`HBrO_(4)`

ANSWER :A
Discussion
20125.

Which one is formed when Benzaldehyde reacts with Malonic acid in the presence of Pyridine?

Answer»

Cinnamaldehyde
Benzoin
Hydrobenzamide
Cinnamic ACID

SOLUTION : Cinnamic acid
Discussion
20126.

The time needed for the completion of 2/3 of a 1st order reaction, when rate constant is 4.771xx10^(-2)"min"^(-1) is

Answer»

`23.03` MIN
`2.303` min
`6.93` min
`69.3` min

Answer :A
Discussion
20127.

Which one of the following is a free-redical substitution reaction?

Answer»




ANSWER :A
Discussion
20128.

Which among the following has the vacant s-orbital?

Answer»

Rh
Pd
Ag
Cd

Solution :`""_(46)Pd: [Kr] 4D^(10) 5S^(0)`
Discussion
20129.

Write the following reactions: (a) Wurtz reaction, (b) Fittig reaction, (c) Finkelstein's reaction

Answer»

Solution :(a) Wurtz reaction
`CH_(3)-CL+2Na+ Cl -CH_(3) underset("Dry ether")overset(Delta)to underset("Ethane")(CH_(3)-CH_(3)+2NaCl)`
(B) Fittig reaction

(C) Finkelstein.s reaction
`C_(2)H_(5)Cl+ NAI overset("Acetone")to C_(2)H_(5)I+ NaCl`
Discussion
20130.

The strongest oxidising agent is :

Answer»

`HClO_(4)`
`HClO_(3)`
`HClO_(2)`
`HCLO.`

ANSWER :D
Discussion
20131.

What are nucleic acids ? Mention their two important functions.

Answer»

Solution :Nucletic acids are biomolecules which are found in the nuclei of all living cells in form of NUCLEOPROTEINS or chromosomes (protein containing nucleic acids as the prosthetic group).
Nucletic acids are of TWO types : deoxyribonucleic acid (DNA) and RIBONUCLEIC acid (RNA). The two main functions of nucleic acids are :
(i) DNAis responsible for transmission of hereditary effects from one generation to another. This is due to the unique property of replication during CELL divison as a result of which two identical DNA strands are transferred to the daughter cells .
(ii) DNA and RNA are responsible for synthesis of all proteins needed for the growth and maintenance of our body. Actually the proteins are synthesized by various RNA molecules (r-RNA , m-RNA and t-RNA) in the cell but the message for the synthesis of a particular protein is given by DNA molecules.
Discussion
20132.

What is the action of litmus with aqueous chlorine?

Answer»

Solution :Aqueous chlorine turn blue LITMUS to red and FINALLY COLOURLESS . It ALSO turns red litmus colourless . This is because of the fact that aqueous chlorine is acidic and also acts as a bleaching agent.
Discussion
20133.

Which one of the bio-molecule is insoluble in water

Answer»

keratin
haemoglobin
insulin
globulin

Answer :A
Discussion
20134.

Which of the following is NOT true for metal carbonyls ?

Answer»

The oxidation state of the metal in the CARBONYLS is zero.
M-C `PI` bond is FORMED by DONATION of electron pair from metal to carbon monoxide.
Metal carbonyls are single bonded species .
`dpi-ppi` overlap is observed in metal carbonyls.

Answer :C
Discussion
20135.

When XO_(2) is fused with an alkali metal hydroxide in presence of an oxidizing agent such as KNO_(3), a dark green product is formed which disproportionates in acidic. Solution to afford a dark purple solution X is…..

Answer»

V
Mn
Cr
Ti

Solution :`MnO_(2) + 2KOH + KNO_(3) rarr K_(2)MnO_(4) + KNO_(2) + H_(2)O`
`3MnO_(4)^(2-) + 4H^(+) rarr 2MnO_(4)^(-) + MnO_(2) + 2H_(2)O`
Discussion
20136.

Total number of ions the complex CoCl_3 .6NH_3gives in water

Answer»

2
3
4
6

Answer :C
Discussion
20137.

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

Answer»

SOLUTION :
Discussion
20138.

The spin only magnetic moment of Ni^(2+) in aqueous solution would be

Answer»

0B.M
1.73B.M.
2.83B.M.
4.90B.M.

Solution :`Ni^(2+)=[Ar]3D^(8)`

Magnetic moment `=sqrt(N(n+2))` B.M.
`=sqrt(2(2+2))=sqrt(8)` B.M. =2.83B.M.
Discussion
20139.

Which of the following alkyl halide is used as methylating agent:

Answer»

`C_2H_5G`
`C_2H_5Br`
`C_2H_5I`
`CH_3I`

ANSWER :D
Discussion
20140.

What is the covalence of nitrogen in N_2O_5 ?

Answer»

SOLUTION : Covalency denotes the number of shared pairs of ELECTRONS. In `N_2 O_5`, each NITROGEN atom has four shared pairs of electrons as SHOWN below:

Therefore , the covalency of N in `N_2O_5` is 4.
Discussion
20141.

What is chirality ?

Answer»

SOLUTION :The PROPERTY of an OBJECT and its mirror image being nonsuper IMPOSABLE is .CHIRALITY..
Discussion
20142.

What is the freezing point of water at 1 atmospheric pressure in kelvin scales ?

Answer»

SOLUTION :The freezing point of water at 1 atmospheric pressure is `0^@C` i.e 273 K.
Discussion
20143.

The substance which is oxidised is a…………agent and the one which is reduced is an ........... agent.

Answer»

SOLUTION :REDUCING, OXIDISING
Discussion
20144.

The uncertainty in the position of an electron (mass =9.1xx10^(-28)g) moving with a velocity of 3.0xx10^(4) cms^(-1) accurate up to 0.011% will be

Answer»

1.92 cm
7.68 cm
0.175 cm
3.84 cm

Answer :C
Discussion
20145.

Which of the following do(es) not represent DeltaH formation of the product. (I) 1/2 H_(2)(g)+(aq) rarr H^(+) (aq)""(II) 2/3 O_(3) (g) rarr O_(2)(g) (III) NH_(4)^(+) (g)+Cl^(-) (g) rarr NH_(4)Cl(s)""(IV) P_(4) ("black") +5O_(2) (g) rarr P_(4)O_(10) (s) (V) Reaction representing DeltaH_("combustion") of C (graphite).

Answer»

`I, IV, V`
`II, IV`
`II, III, IV`
`II, III, IV, V`

Solution :`(I) DeltaH_(f)` of `H^(+)`
`(V) DeltaH_(f)` of `CO_(2)(g)`
`{:( :.,II RARR O_(2)(g) rarr O_(2) (g),DeltaH_(f)O_(2),),(,III rarr 1/2 N_(2)+2H_(2)+1/2 Cl_(2),DeltaH_(f)NH_(4)CL,),(,IV rarr P_(4)("white")+…..,DeltaH_(f)P_(4)O_(10),,"option (C)"):}`
Discussion
20146.

Which of the following compounds gives trichloromethane on distilling with bleaching powder?

Answer»

A) methanal
B) phenol
C) ethanol
D) methanol

Solution : (i) ALCOHOL is first oxidised to acetaldehyde by chlorine,
`[CI_(2)+H_(2)Oto 2HCI +O]`
`CH_(3)CH_(2)OH+O to CH_(3)CHO+H_(2)O`
(II) Acetaldehyde then reacts with chlorine to form chloral
`CH_(3)CHO+3Cloverset("chlorination")toCCI_(3)CHO+3HCI`
(iii)Chloral, thus FORMED, is hydrolysed by calcium hydroxide.
`CCI_(3)CHO+CA(OH)_(2)to2CHCl_(3)+(HCOO)_(2)Ca`.
Discussion
20147.

Write the correct formulae for the following coordination compounds : CrCl_(3).6H_(2)O (light green colour, with 2 chloride ions precipitated as AgCl)

Answer»

SOLUTION :Chlorine atoms outside the coordination SPHERE REACT with silver ions to give silver chloride.
`[CrCl(H_(2)O)s]Cl_(2).H_(2)O`
Pentaaquachloridochromium dichloride MONOHYDRATE
Discussion
20148.

Which of the following complexes formed by Cu^(2+) ions is most stable ?

Answer»

`CU^(2+)+4NH_(3)IFF[Cu(NH_(3))_(4)]^(2+),log K=11.6`
`Cu^(2+)+4CN^(-)iff[Cu(CN)_(4)]^(2-)log K=27.3`
`Cu^(2+)+2eniff[Cu(en)_(2)]^(2+), logK=15.4`
`Cu^(2+)+4H_(2)Oiff[Cu(H_(2)O)_(4)]^(2+), logK=8.9`

SOLUTION :Higher the log K value, greater is the stability
Discussion
20149.

Which is the best choice for weak base-strong acid titration

Answer»

methyl RED
Litmus
Phonol red
Phenolphthalein

Solution :pH curve of strong acid with a weak BASE is vertical over the pH range of 4 to 7.

The indicator that shows COLOUR change within this range is suitable. Methyl red (pH range 4.4-6.5) is the best CHOICE.
Discussion
20150.

The solubility of a salt of weak acid (AB) at pH 3 is Y xx 10^(-3) mol L^(-1). The value of Y is ___________ (Given that the value of solubility product of AB(K_(sp)) = 2 xx 10^(-10) and the value of ionization constant of HB(K_(a)) = 1 xx 10^(-8))

Answer»


Solution :`S = sqrt(K_(SP)(([H^(+)])/(K_(a))+1))= sqrt(2 xx10^(-10)((10^(-3))/(10^(-8))+1)) = sqrt(2 xx 10^(-5))`
`= 4.47 xx 10^(-3) M`
Discussion