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5901.

Which gas is adsorbed strongly by charcoal ?

Answer»

`CO`
`N_2`
`H_2`
`NH_3`

ANSWER :D
Discussion
5902.

The relationship between [Co(NH_(2)-CH_(2)-underset(CH)underset(|)(CH)-CH_(2)-NH_(2))_(2)Cl_(2)]^(+) and[Co(NH_(2)-CH_(2)-CH_(2)-CH_(2)-NH_(2)]_(2)Cl_(2)]^(+) is

Answer»

LINKAGE isomer
Ligand isomers
Coordination isomer
Solvate isomers

Answer :B
Discussion
5903.

Which ion shows usually co-ordination number 6:

Answer»

`CR^(3+)`
`FE^(3+)`
`Fe^(2+)`
All

Answer :D
Discussion
5904.

The telluric helix was given by

Answer»

DE CHAN COURTOIS
Newlands
L.Meyer
Mendeleev

Answer :A
Discussion
5905.

Which of the following reactions lead to chemical inertness :

Answer»

Lead with dilute `H_(2)SO_(4)`
Lead with CONC. `HCI`
ALUMINIUM with oxygen
All of above reactions

Solution :(1)`Pb+H_(2)SO_(4)toPbSO_(4)("LAYER")+H_(2)uarr`
(2)`Pb+Conc.HCl to PbCl_(2)("COATING")+H_(2)uarr`
(3)`2Al+3//2 O_(2)to Al_(2)O_(3)(s)`
Discussion
5906.

The tendency to lose their valence electron easily by alkali metals makes them :-

Answer»

STRONG REDUCING agent
Weak reducing agent
Strong OXIDISING agent
Weak oxidising agent

Answer :A
Discussion
5907.

Which of the following methods of preparation of amines will ot give same number of carbon atoms in the chain of amines as in the reactant?

Answer»

Reaction of alkyl nitrile with `LiAlH_(4)`.
Reaction of amide with `LiAlH_(4)` followed by treatment with water.
heating alkyl halide with POTASSIUM salt of phthalimide followed by hydrolysis.
Treatment of amide with bromine in aqueous solution of sodium hydroxide.

Solution :Only treatment of amide with `Br_(2)` in aqueous solution of NAOH will give an AMIE with lesser number of carbon atoms than in the reactant while
`RCONH_(2) overset(Br_(2)//NaOH)to RNH_(2)`
All the remaining reactions give an amine with the same number of carbon atoms as in the reactant.
Discussion
5908.

Which of the following substance does not produce tri-iodomethane with the mixture of alkali and I_(2) ?

Answer»

Propan-1-ol
Ethanol
Dimethyl ketone
Ethanal

Solution : Propan-1-ol
Discussion
5909.

The values of vander Waal's constant 'a' for gases O_(2), N_(2) ,NH_(3 and CH_(4) are 1.360, 1.390 , 4.170 and 2.53 l it^(2) atmm o l^(-2) respectively. The gas which can be most easily liquefied is

Answer»

`O_(2)`
`N_(2)`
`NH_(3)`
`CH_(4)`

Answer :C
Discussion
5910.

Write note on oligosaccharides and polysaccharides with examples.

Answer»

Solution :(i) Oligosaccharides are SUGARS that YIELD TWO to TEN monosaccharide molecules on hydrolysis.
Eg: Sucrose, Raffinose
(II) Polysaccharides are carbohydrates which involve a large number of monosaccharide units linked to each other by oxide bridges. These linkages are called glycosidic linkages.
Eg: Starch, cellulose and inulin.
Discussion
5911.

Which of the following does not reduce Fehling's solution

Answer»

Benzaldehyde
Formic acid
Glucose
FRUCTOSE

SOLUTION :Fructose does not reduce Fehling's solution because it contains ketonic GROUP.
Discussion
5912.

Write the names of reagents and equations for the preparation of the following ethers by Williamson's synthesis : (i) 1-Propoxyprорane (ii) Ethoxybenzene (iii) 2-Methoxy-2-methylpropane (iv) 1-Methoxyethane

Answer»

SOLUTION :
Discussion
5913.

What is the molecular formula of bromic acid ?

Answer»

HOBrO
`HOBrO_(3)`
`HOBrO_(2)`
`HOBrO_(4)`

ANSWER :C
Discussion
5914.

Which of the following are diamagnetic? (I) K_(4)[Fe(CN)_(6)] (II) K_(3)[Cr(CN)_(6)] (III) K_(3)[Co(CN)_(6)] (IV) K_(2)[Ni(CN)_(4)] Select the correct answer using the codes given below:

Answer»

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

Answer :B
Discussion
5915.

Which givesa neutral solution in water ?

Answer»

`CuSO_4`
`BA(NO_3)_2`
`CrCl_3`
`(NH_4)_2SO_4`

ANSWER :B
Discussion
5916.

Which of the following may exist in enantiomorphs

Answer»

`{:(""CH_(3)),("|"),(CH_(3)-CH-COOH):}`
`CH_(2)=CHCH_(2)CH_(2)CH_(3)`
`{:(""NH_(2)),("|"),(CH_(3)-CH-CH_(3)):}`
`{:(""NH_(2)),("|"),(CH_(3)-CH_(2)-CH-CH_(3)):}`

Solution :`{:(""NH_(2)),("|"),(CH_(3)-CH_(2)-C^(**)-CH_(3)),("|"),(""H):}`
Chiral centre is present. Hence, it exists as optical ISOMERS or enantiomorphs.
Discussion
5917.

Which of the following statements are in accordance with the Arrhenius equation?

Answer»

Rate of a reaction increases with INCREASE in temperature
Rate of reaction increases with decreases in ACTIVATION energy
Rate constant decreases exponentially with increase in temperature
Rate of reaction decreases with decrease in activation energy.

Solution :rrhenius equation ,K=`Ae^(-(E_(a))/(RT))`
So (A) `kprop e^(-(1)/(T))`
`therefore` Rate `rpropT`
TEMPERATUE increase than the rate of reaction increase.
(b)In Arrhenius equation `k prop e^(-E_(a))`
So, `k prop(1)/(E_(a))`
If energy of activation decreases than rate of reaction increases.
Discussion
5918.

Write two uses of ClO_(2)

Answer»

Solution :(i) `ClO_(2)`is a powerful oxidizing agent as WELL as chlorinating agent. So, it is used to bleach WOOD pulp, and cellulose and for WATER purification.
(ii) It is also used to bleach flour and in MANUFACTURE of white bread.
Discussion
5919.

Which attraction forces are between adsorbent and adsorbate in physical adsorption ?

Answer»

Ionic
Covalent
van DER Waals
H-bond 

ANSWER :C
Discussion
5920.

What are cresols? Give examples.

Answer»

SOLUTION :METHYL PHENOLS are CALLED CRESOLS.
They are
Discussion
5921.

Which parts of amino acid molecules are linked through hydrogen bonds in the secondary structure of proteins :

Answer»

`-SH GROUP`
(-COOH )group
C=O and -NH groups
Alkyl group

Answer :C
Discussion
5922.

What happens when alcohol is treated with ammonia under pressure in presence of Al_2O_3?

Answer»

SOLUTION :A MIXTURE of primary , SECONDARY, tertiary AMINE is formed.
Discussion
5923.

Which reagent is commonly used for the separation of 1^(@), 2^(@) and 3^(@) amines ?

Answer»

Benzene sulphonly chloride
`HNO_(2)`
Alcoholic `KOH`
TOLLEN's reagent.

Answer :A
Discussion
5924.

Which among the following has less rate of effusion than moist air under similar condition :

Answer»

He
Dry AIR
`NH_(3)`
HEAVY hydrogen

Answer :B
Discussion
5925.

What are lyophilic and lyophobic sols ? Give are example of each type. Why are hydrophobic sols easily coagulated ?

Answer»

Solution :Lyophilic sols : Colloidal sols directly formed by mixing substances in a suitable DISPERSION medium are CALLED lyophilic sols. These are quite stable. These are also known as reversible sols because the dispersion medium can be separated from the colloid by means of physical methods like evaporation. e.g., gum, gelatin, starch, rubber etc.
Lyophobic sols (Liquid hating) Such sols are not formed by simply mixing the substance with the dispersion medium. These are not stable, i.e., these sols are coagulated easily when a small amount of electrolyte is added to them or they are heated or shake. These sols need stabilizing agent for their preservation, e.g., gold sol,`As_2O_3, Fe(OH)_(3)` etc.
Reason for coagulation of hydrophobic sols : These sols are PRECIPITATED due to the removal or neutralization of charge on their PARTICLES, i.e., they come nearer, form aggregate and settle down, (in other words, coagulation or PRECIPITATION occurs.) This is done by addition of a small amount of electrolyte .
Discussion
5926.

What is precursor of steroid hormone ?

Answer»

PROTEIN
CARBOHYDRATE
CHOLESTEROL
LIPID

SOLUTION :Cholesterol
Discussion
5927.

Which Noble gas is not found in atmosphere

Answer»

Rn
Kr
Ne
Ar

Answer :A
Discussion
5928.

Which of the following pair have same hybridisation :-

Answer»

`ClO_(4)^(-) & ClO_(2)^(-)`
`SF_(4)& C Cl_(4)`
`BF_(3) & NF_(3)`
`CO_(2) & SO_(2)`

SOLUTION :(i) `ClO_(4)^(-) = sp^(3) , ClO_(2)^(-) = sp^(3)`
(ii) `SF_(4) = sp^(3)d , C Cl_(4)= sp^(3)`
(III) `BF_(3)=sp^(3) , NF_(3)=sp^(3)`
(iv) `CO_(2)=SP , SO_(2) = sp^(2)`
Discussion
5929.

Which of the following statements about enzymes are true?

Answer»

Enzyme catalyse chemical REACTIONS by LOWERING the activation energy
Enzymes are highly specific both in BINDING chiral substrates and in catalysing their reactions
Enzymes lack in NUCLEOPHILIC groups
pepsin is proteolytic enzyme

Answer :B
Discussion
5930.

Which of the following compound is not resonance stablized ?

Answer»




ANSWER :C
Discussion
5931.

Under what conditions is E_(cell)=0 or Delta_(r)G=0?

Answer»

Solution :`E_(CELL)=0` or `Delta_(r)G=0` when the cell REACTION reaches equilibrium.
Discussion
5932.

What happens when benzenediazonium chloride is heated with water?

Answer»

Solution :Phenol is FORMED.
`underset("Benzenediazonium CHLORIDE")(C_(6)H_(5)-overset(+)(N)-=NCl^(-))+H_(2)O overset(H^(+))to underset("Phenol")(C_(6)H_(5)OH)+N_(2)+HCl`
Discussion
5933.

What is the suitable reagent for the following reaction ? R- CH_(2)CH_(2)OH to R-CH_(2)CH_(2)COOH

Answer»

`PBr_(3), KCN, H_(3)O^(+)`
`PBr_(3), KCN, H_(2)//Pt`
`KCN, H_(2)O^(+)`
`PBr_(3), H_(3)O^(+)`

SOLUTION :`PBr_(3), KCN, H_(3)O^(+)`
Discussion
5934.

Which of the following ions does not liberate hydrogen gas on reaction with dilute acids?

Answer»

`Mn^(2+)`
`Ti^(2+)`
`V^(2+)`
`Cr^(2+)`

Solution :THIRD ionization ENTHALPY is very high for Mn
Discussion
5935.

What happens when SO_2 reacts with CI_2 : (i) in presence of sunlight. (ii) in presence of moisture ?

Answer»

SOLUTION :(i) Sulfuryl CHLORIDE is FORMED
`SO_2 + Cl_2 rarr UNDERSET("Sulphuryl chloride")(SO_2Cl_2)`
(ii) `H_2SO_4` is formed :
`SO_2 + H_2O + Cl_2 rarr H_2SO_4 + 2HCl`
Discussion
5936.

The type of Hybride orbitals used by Chlorine atom in ClO_(2)^(-) ion

Answer»

`SP^(3)`
`sp^(2)`
`sp`
`1 & 2`

SOLUTION :In all oxy ACIDS of CHLORINE, Cl under gos `sp^(3)` hybridisation.
Discussion
5937.

What is the composition of electroconductive pest used in mercury cell ?

Answer»

Zn-Hg and HgO
KOH and Zn-Hg
KOH and ZNO
HgO and ZnO

Solution :KOH and ZnO
Discussion
5938.

Which metal sulphide has maximum solubility in water?

Answer»

`CDS(K_sp=36xx10^-30)`
FES(K_sp=11xx10^-20)
`HGS(K_sp=32xx10^-54)`
`ZnS(K_sp=11xx10^-22)`

Answer :B
Discussion
5939.

underset((A))(3CH_(3)COCH_(3))underset(-H_(2)O)overset(HCl)rarr (CH_(3))_(2)C=CH-underset((B))(CO)-CH=C(CH_(3))_(2) This polymer (B) is obtained when acetone is saturated with HCl gas, B can be

Answer»

phorone
formose
diacetone alcohol
mesityl oxide

Answer :A
Discussion
5940.

write functional isomers for C_4H_10O .

Answer»

5
7
2
4

Answer :B
Discussion
5941.

Which of the folllowing can be used to distinguised between 1-butyne and 2-butyne?

Answer»

Grignard reagent
AMMONICAL `AgNO_(3)`
ammonical `Cu_(2)Cl_(2)`
Baeyer's reagent

Solution :1-Butyne will give white ppt. with ammonical `AgNO_(3)` and red ppt. with ammonical `Cu_(2)Cl_(2)`. 1-Butyne will also react with Grignard reagent. None of these reactions will be GIVEN by 2-butyne.
`UNDERSET("But-1-yne")(CH_(3)-CH_(2))-C-=CH+CH_(3)MgBr to underset("Methane")(CH_(4))+Br-MgC-=C-CH_(2)-CH_(3)`
Discussion
5942.

Which of the following compound is expected to be most basic :

Answer»

Aniline
Ethylamine
Hydroxylamine
Methylamine

ANSWER :B
Discussion
5943.

What mass of MnO_(2) is reduced by 35 mL of 0.16 N oxalic acid (H_(2)C_(2)O_(4)) in acidic solution ? The skeleton equation is :-MnO_(2)+H^(+)+H_(2)C_(2)O_(4)toCO_(2)+H_(2)O+Mn^(2+)

Answer»

8.7 g
0.24 g
0.84 g
43.5 g

Answer :2
Discussion
5944.

Volume occupied by molecules of one mole gas at NTP, each having radius of 10^(-8) cm is :

Answer»

22.0 litre
22.4 litre
10.09 mL
10.09 litre

Answer :C
Discussion
5945.

Two faradays of electricity are passed through a solution of CuSO_(4).The mass of copper deposited at the cathode is (atomic mass of Cu=63.5 g)

Answer»

2 G
127 g
0 g
63.5 g

Solution :(d) The REDUCTION REACTION is :
`Cu^(2+)(aq)+underset(2F)2e^-) to underset(=63.5 g)underset(1 g" atom")(Cu(s))`
Discussion
5946.

x g of H_2O_2 require 100 mL of M/5 KMnO_4 in a titration in a solution having pOH=1.0 which of following is/are correct ?

Answer»

The value of x is 1.7 g
The value of x is 0.34 g
`MnO_4^-` CHANGES to `MnO_4^(-2)`
`H_2O_2` CHANGE to `O_2`

SOLUTION :pOH=1 strong basic MEDIUM
`implies MnO_4^(-)toMnO_4^(-2) (n=1)`
`2OH^(-)+H_2O_2 to O_2+2H_2O+2e^(-)`
meq. of `H_2O_2` = meq of `MnO_4^(-)`
`(x/34)/2xx1000=100xx1/5xx1 implies x=0.34 g`
Discussion
5947.

Which of the following is the most acidic diazonium salt ?

Answer»

`C_6H_5CH_2N_2^(+)X^(-)`
`CH_3N_2^(+)X^(-)`
`CH_3CH_2N_2^(+)X^-`
`C_6H_5N_2^(+)X^(-)`

ANSWER :D
Discussion
5948.

When acetaldehyde is heated with Fehling solution, it gives a precipitate of

Answer»

CUO
`Ci_(2)O`
`CuO+CU`
`Cu_(2)O+Cu`

Answer :B
Discussion
5949.

Which ofthefollowingstatementsis not ture ?

Answer»

Alkynesshowgeometricalisomerism
Ethylzeneeachcarbon`sp^(2)` hybridisationof carbon
In benzeneeachcarbon ATOM UNDERGOES `sp^(2)` hybridisation
Themolecular formulae ofcyclobutaneand buteneare same .

ANSWER :A
Discussion
5950.

Which of the following have maximum and minimum ionic character out of MnO, MnF_2,MnO_2, MnO_2O_7 ?

Answer»

`MNO,Mn_2O_7` RESPECTIVELY
`MnF_2, Mn_2O_7` resectively
`MnO_2, MnO` respectively
`Mn_2O_7, MnO` respectively

Solution :Minimum ionic character `=Mn_2O_7` DUE to `(MN^(7+))`
Maximum ionic character `=MnF_2(Mn^(2+))`
Discussion