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13151.

Which halogen oxidises water to liberate oxygen exothermally ?

Answer»

fluorine
chlorine
bromine
iodine

Answer :A
Discussion
13152.

Which alkali metal ion has lowest mobility in aqueous solution ?

Answer»

`Rb^+`
`Cs^+`
`Li^+`
`NA^+`

ANSWER :C
Discussion
13153.

Which one of the following is used in radiotherapy ?

Answer»

Ar
Kr
Xe
Rn

Answer :D
Discussion
13154.

Which of the following is parammagnetic ?

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`[CO(NH_(3))_(6)]^(3+)`
`[Ni(CO)_(4)]`
`[NiF_(4)^(2-)]`
`[Ni(CN)_(4)]^(2-)`

SOLUTION :(c) `[NiF_(4)]^(2-)` has 2 unpairedelectrons, hence it SHOWS paramagnetic behaviour.
Discussion
13155.

Which of the following eather is formed from alcohol and diazomethane ?

Answer»

1-ethoxypropane
ethoxyethane
1-methoxypropane
2-ethoxypropane

Solution :1-methoxypropane is formed from propanol and DIAZOMETHANE.
`underset("propan-1-ol")(CH_(3)CH_(2)CH_(2)OH)+CH_(2)N_(2)overset(HBF_(4))to`
`underset("1-methoxypropane")(CH_(3)CH_(2)CH_(2)OCH_(3))+N_(2)`
Discussion
13156.

Which of the following is not a sugar ?

Answer»

GLYCOGEN
MALTOSE
LACTOSE
Galactose

Solution :Glycogen
Glycogen is a POLYSACCHARIDE. POLYSACCHARIDES are non-sugars
Discussion
13157.

Which of the following is displaces by Fe

Answer»

Ag
Hg
Zn
Na

Solution :Because these COMES after the FE in ELECTROCHEMICAL SERIES.
Discussion
13158.

The steps involved in the above reaction can be arranged can be arranged as . Electrophilic substitution = step (w) Nucleophilic substitution = step (x) Reduction reaction = step (y) Diszoccoupling reaction = step (z) Assign the correct numbers to the type of reaction as follows

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SOLUTION :
Discussion
13159.

What modification can you suggest in the Hardy-Schulze law?

Answer»

Solution :ACCORDING to Hardy-Schulze LAW, the coagulating ION has charge opposite to that on the colloidal particles. Hence, the charge on colloidal particles is neutralized and coagulation occurs. The law can be modified as : When oppositely charged sols are mixed in proper PROPORTIONS to neutralize the CHARGES of each other, coagulation of both the sols occurs.
Discussion
13160.

Which of the followingstatement(s) is / aretrue for secondary cell

Answer»

it cannot be reused
it CANNOTBE recharged
it undergo large numberof CHARGING and DISCHARGING cycles
all of the above

SOLUTION :Secondarycell afteruse can be recharged by passingcurrent through it in opposite directionso that it can beused again
Discussion
13161.

Which of the following combination will not yield secondary amine ?

Answer»

REDUCTION of aldoxime
Reduction of carbylamines
Reduction of SCHIFF's base
Reduction of N-Methylethanamide.

Solution :Reduction of aldoximes gives `1^(@)` amine, OTHERS give `2^(@)` amine.
Discussion
13162.

Which indicates the common laboratory method for the preparation of chlorine:

Answer»

`4HCl + O_2 rarr 2H_2O + 2Cl_2`
`2NaCl + 2H_2O rarr 2NAOH + H_2 + Cl_2`
`MnO_2 + 4HCl rarr MnCl_2 + Cl + 2H_2O`
`2Mg_2OCl_2 + O_2 rarr 4MgO + 2Cl_2`

Answer :C
Discussion
13163.

The relation between glucose and mannose is

Answer»

ANOMERS
DISACCHARIDES
EPIMERS
Ketohexoses

Answer :C
Discussion
13164.

Which of the following is(are) true about metal - ligands complex :

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Larger the ligand, the more stable is the METAL-ligand complex
Highly charged ligand forms stronger bonds
Larger the PERMANENT dipole moment of ligand, the more stable is the bond
Greater the ionisation potential of central metal, the stronger the bond

Solution :Strength of M-L bond DEPENDS on electrostatic ATTRACTIONS between metal and ligand.
Discussion
13165.

Which of the following gases is not a permanent gas?

Answer»

`NH_3`
`H_2`
`N_2`
`O_2`

SOLUTION :`NH_3`
Discussion
13166.

Which is used as mordant ?

Answer»

`AlCl_3`
`Al_2(SO_4)_3`
`Al_2O_3`
Alum

Answer :D
Discussion
13167.

Which of the following is not be prepared by Sandmeyer's reaction ?

Answer»

Chlorobenzene
Bromobenzene
IODOBENZENE
FLUOROBENZENE

Solution :Fluorobenzene and iodobenzene cannot be PREPARED by Sandmeyer.s REACTION
Discussion
13168.

Write the product obtained at anode on electrolysis of concentrated sulphuric acid using platinum electrodes.

Answer»

Solution :The reaction that TAKES PLACE at the anode in the case of electrolysis of concentrated sulphuric ACID is `2SO_(4)^(2-) (aq) to S_(2)O_(8)^(2-) (aq) + 2e^(-)`
Thus, `S_(2)O_(8)^(2-)` ions are produced.
Discussion
13169.

Which of the following contain same number of molecules ?

Answer»

`0.1 " MOL of " CO_(2)`
`3.2 " g of " O_(2)`
`0.1 ` g ATOM of helium GAS
`11.2 " L of " SO_(2)`

Solution :N/A
Discussion
13170.

There are two – NH_2group in semicarbazide. However, only one is involved in the formation of semicarbazone. Why?

Answer»

Solution :Although semicarbazide has TWO `– NH_2`GROUPS but only one of them is involved in RESONANCE as shown below:
As a result, `e^-`density on one of the `- NH_2`group is REDUCED and hence it does not act as nucleophile.One pair of the other `- NH_2`group is not involved in resonance and hence it is available for nucleophilic attack.
Discussion
13171.

Which of the following is the correct order of ease of coupling with C_(6)H_(5)N_(2)CI? A) Benzene B) Nitro benzene C) PhenolD) Chloro benzene

Answer»

`A GT D gt B gt C`
`C gt A gt B gt D`
`C gt A gt D gt B`
`B gt D gt A gt C`

ANSWER :C
Discussion
13172.

The sources of fats and oils are :

Answer»

Milk
Butter
Cheese
All

Answer :D
Discussion
13173.

Which of the following reactions does NOT show nucleophilic substitution of C_(2)H_(5)Br ?

Answer»

`C_(2)H_(5)Br +2H to C_(2)H_(6) +HBr`
`C_(2)H_(5)Br +KOH to C_(2)H_(5)OH +KBr`
`C_(2)H_(5)Br+AgCN to C_(2)H_(5)NC +AgBr`
`C_(2)H_(5)Br +C_(2)H_(5)Ona to C_(2)H_(5)OC_(2)H_(5)`

Answer :A
Discussion
13174.

What do you mean by activity and selectivity of catalyst?

Answer»

Solution : (i) Activity of Catalyst:
The activity of catalyst is its ability to increase the rate of a particular reaction, Chemisorption is the main factor in deciding the activity of a catalyst. The ADSORPTION of reactants in the catalyst surface should be NEITHER too strong nor too weak. It should just be strong enough to make the catalyst active.
(ii) Selectivity of the catalyst:
The ability of the catalyst to direct a reaction to yield a particular product is referred to as the selectivity of the catalyst. For example, by using DIFFERENT catalysts, we can get different products for the reaction between `H_(2)` , and CO
(a)`CO_((g))+3H_(2(g)) overset(Ni) to CH_(4(g)) + H_(2)O_((g))`
(b) `CO_((g)) + 2H_(2(g)) underset(CrO_3)overset(Cu//ZnO)to CH_3OH_((g))`
(c) `CO_((g))+ H_(2(g)) overset(Cu) to HCHO_((g))`
Discussion
13175.

Which is the latest method used for food preservation?

Answer»

Solution :Irradiation by using GAMMA RAYS is the latest method.
Example : Spoilage of potatoes and ONIONS due to SPROUTING is PREVENTED by gamma rays.
Discussion
13176.

The vapour pressure (VP) of a dilute solution of non-volatile solute is P and the VP of pure solvent is P_0 the lowering of the VP is :

Answer»

<P>`+ve`
`- ve`
`P/P_0`
`P _0 / P`

ANSWER :A
Discussion
13177.

Which of the following shows variation of BE of halogens

Answer»




ANSWER :A
Discussion
13178.

What is pseudo first order reaction ? Give an example of it.

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SOLUTION : Example. `CH_(3)COOC_(2)H_(5)+H_(2)O overset(H^(+))toCH_(3)COOH+C_(2)H_(5)OH`
Discussion
13179.

Whichone givenbelowis a non - reducingsugar ?

Answer»

Glucose
SUCROSE
maltose
Lactose

ANSWER :B
Discussion
13180.

When aniline is heated with glacial acetic acid in presence of anhydrous ZnCl_2, the product is:

Answer»

ACETAMIDE
Acetanilide
Phenhyl acetamide
Chlorobenzene

Answer :B
Discussion
13181.

Which of the following has positive M^(2+)(aq) standard reduction electrode potential ?

Answer»

CU
Zn
Fe
Mn

Solution :Cu
Discussion
13182.

Under what conditions glucose is converted to gluconic and saccharic acid ?

Answer»

Solution :GLUCOSE is CONVERTED to GLUCONIC acid by bromine WATER and to saccharic acid by CONC. `HNO_(3)`
Discussion
13183.

Which of the following is used as anaesthetic :

Answer»

`CHCl_3`
`C_2H_5OH`
`C_2H_5OC_2H_5`
`CHCl_3 and C_2H_5OC_2H_5`

ANSWER :D
Discussion
13184.

Two fo the constituents of German silver are :

Answer»

AG - Cu
Ag - Zn
Cu - Zn
Cu - Mg.

ANSWER :C
Discussion
13185.

When ethanol is dehydrated in laboratory ,it produces 50% ethylene which is then allowed to react with bromine to produce 80% bormo compound . Calculate the mass of ethylene dibromide expected to be obtained from 0.5 mol ethanol.

Answer»


ANSWER :37.6 G
Discussion
13186.

Which of the following alkane is synthesised from single alkyl halide ?

Answer»

`(CH_(3))_(2)CH CH_(2)CH_(3)`
`(CH_(3))_(2)CHCH_(3)`
`(CH_(3))_(3)C-C(CH_(3))_(3)`
`CH_(3)CH(CH_(3))CH_(2)CHCH_(3)`

Solution :Compound Cis prepard from t-butyl halide. (Wurtz reaction)
Discussion
13187.

Write partial structure of the following polymer. Polypropene.

Answer»

SOLUTION :`[--CH_2 - OVERSET(CH_3) overset(|)CH --]_n`
Discussion
13188.

Which is most basic among the following?

Answer»




Solution :Due to steric effect of 2 Me-groups PRESENT on NITROGEN atom Lp on N will BECOME out of plane of electron. i.e. more AVAILABLE,
Discussion
13189.

Which of the following is used as insecticides gt

Answer»

`CHCl_(3)`
`CHl_(3)`
`CH_(2)Cl`
`DDT`

Answer :D
Discussion
13190.

Which of the following lanthanoid ion is paramagnetic ?

Answer»

`CE^(4+)`
`Yb^(2+)`
`Lu^(3+)`
`Eu^(2+)`

SOLUTION :`Ce= [Xe] 4f^(1) 5d^(1) 6s^(2), Ce^(4+)= [Xe]`
`Yb= [Xe] 4f^(14) 6s^(2) , Yb^(2+) = [Xe] 4f^(14)`
`Lu = [Xe] 4f^(14) 5d^(1) 6s^(2) ,Ly^(3+) = [Xe] 4f^(14)`
`E U= [Xe]4f^(7)6s^(2) , Eu^(2+) = [Xe] 4f^(7)`
Thus, only `Eu^(2+)`hasunpaired electrons , vix.7.
Discussion
13191.

Which of the following oxide is thermaly least stable?

Answer»

CAO
`Al_2O_3`
`Fe_2O_3`
`Ag_2O`

ANSWER :D
Discussion
13192.

Which of the following as an aqueous solution has a freezing point most nearly equal to that of an equimolar solution of K_(4)[Fe(CN)_(6)] (assume complete ionisation of electrolytes )

Answer»

`K_(2)SO_(4)`
SUCROSE
`Al_(2)(SO_(4))_(3)`
`K_(3)[Fe(CN)_(6)]`

SOLUTION :Because `Al_(2)(SO_(4))_(3)` has same number of ions (FIVE) as that of `K_(4)[Fe(CN)_(6)]` in solution.
Discussion
13193.

Which isomers of C_(5)H_(10)O_(2)shows optical isomerism ?

Answer»

2- methylbutanoicacid
valeric ACID
neo-valeric acid
3- methylbutanoicacid

Answer :A
Discussion
13194.

Which of the following options is incorrect ?

Answer»

pH at HALF equivalent point of a WEAK acid (HA) is equal to `pK_b` of its conjugate base.
An aqueous solution of SODIUM acetate will be basic DUE to anionic hydrolysis
`pK_a` for `H_3O^+` at 298 K is -1.74
On dilution of a solution of a weak acid, degree of IONISATION will increase but `[H^+]` will decrease.

Answer :a
Discussion
13195.

Write the IUPAC names of the following compounds [Pt(NH_3)_2Cl(H_2NCH_3)]Cl

Answer»

Solution :Diamminechlorido (METHYL AMINE)PLATINUM(II) CHLORIDE
Discussion
13196.

What will be the % labelling of oleum containing 40% SO_(3) by mass ?

Answer»

109
118
113.5
122.5

Solution :40% by MASS `SO_(3)`
40 gm `SO_(3)` in 100 gm OLEUM
Hence 109% labelled oleum
Discussion
13197.

Which of the following is generally water insoluble?

Answer»

Fibrous PROTEIN
Vitamin C
AMYLOSE
glycine

ANSWER :A
Discussion
13198.

Which molecule possess the general formula of carbohydrates, but is not a carbohydrate :

Answer»

GLYCERALDEHYDES
ARABINOSE
ACETIC acid
All

Answer :C
Discussion
13199.

What is the product of reaction of 1,3-butadiene with Br_2 ?

Answer»

1, 2 Dibromobutene
3, 4-Dibromobutene
1, 4-Dibromobut-2-ene
2, 3-Dibromobutene

Answer :C
Discussion
13200.

Write the structures of alpha - D-(+)- glucopyranose and beta - D- (+) glucopyranose.

Answer»

SOLUTION :
Discussion