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9751.

Which order reaction obeys the expressiont_(1//2)prop (1)/([A])?

Answer»

First
SECOND
Third
ZERO

ANSWER :B
Discussion
9752.

What product is formed when aniline is first diazotised and then reacted with phenol in the alkaline medium?

Answer»

SOLUTION :p-Hydroxyazobenzene.
Discussion
9753.

Which one of these is NOT true for benzene

Answer»

it forms only one type of monosbustituted product
There are three carbon-carbon SINGLE bonds double bonds
The heat of hydrogenation of benzene is less than the theoretical VALUE
The BOND angle between the carbon -carbon bonds is `120^@`

Solution :Resonance gives each C-C bond in benzene some double bond character and this has been confimed by measuring bond length between two adjacent carbon atom in various compounds of benzene . The bond length C-C (`sigma` bond as in ethane) is 1.54 Å and C=C (double bond as in ethene ) is 1.33 Å.The carbon to carbon bond length in benzene has been found to be 1.39 Å which lies between single and double bond length values
Discussion
9754.

Using the calculated emf value of zinc and copper electrode, calculate the emf of the following cell at 25^@C Zn(s)|Zn^(2+)(aq, 1M)|Cu^(2+)(aq, 1M)|Cu(s)

Answer»

Solution :`E_("CELL")^(@) = E_R^@ - E_L^@`
`E_(Zn//Zn^(2+)) = 0.76 V`
`E_(CU^(2+)//Cu) = -0.34V`
`E_("cell")^(@) = 0.76 - (-034)`
`E_("cell")^(@) = +1.1V`.
Discussion
9755.

Which one can act as oxidising & reducing agent both -

Answer»

`HNO_(2)`
`H_(2)O_(2)`
`H_(2)SO_(3)`
all

ANSWER :D
Discussion
9756.

The synthesis of crotonaldeyde from acetaldehyde is an example of…. Reaction.

Answer»

NUCLEOPHILIC addition
Elimination
Electrophilic addition
Nucleophilic addition-elimination

Answer :D
Discussion
9757.

Which of the following is not a antacid ?

Answer»

phenelzine
Ranitidine
Aluminium hydroxide
Cimetidine

Answer :A
Discussion
9758.

The shape of XeF_4 is

Answer»

SQUARE planar
Tetrahedral
Trigonal planar
Pyramidal.

Answer :A
Discussion
9759.

The stability of dihalides of Si, Ge, Sn and Pb increase steadity in the sequence

Answer»

`PbX_(2)ltltSnX_(2)ltltGeX_(2)ltltSiX_(2)`
`GeX_(2)ltltSiX_(2)ltltSnX_(2)ltltPbX_(2)`
`SiX_(2)ltltGeX_(2)ltltPbX_(2)ltltSnX_(2)`
`SiX_(2)ltltGeX_(2)ltltSnX_(2)ltltPbX_(2)`

Solution :Reluctance of valence SHELL electrons to participate in bonding is called inert pair EFFECT. The stability of LOWER oxidation state (+2 for group 14 element_) increase on going down the group. So the correct order is
`SiX_(2)ltltGeX_(2)ltltSnX_(2)ltltPbX_(2)`
Discussion
9760.

Which is the correct method for the preparation of 2-bromopropane ?

Answer»

HBr is treated with 1 -propanol
Propene is treated with HBr in the presence of peroxides
1-Propanol is treated with CONC. `H_(2)SO_(4)` FOLLOWED by the reaction with HBr
Ethylene is treated with `Br_(2)` (in `C Cl_(4)`) followed by the ELIMINATION of HBr

Answer :C
Discussion
9761.

Write the structure of p-toluidine.

Answer»

SOLUTION :
Discussion
9762.

When a plot of log k versus 1//T of chemical reaction is made, the energy of activation is given by the slope of straight line

Answer»

obtained
MULTIPLIED by + 2.303 R
multipiled by -2.303 R
divided by +2.303 R

Solution :Logarithmic form of Arrhenius equation is :
log `k = log A - (E_(a))/(2.303 RT) xx (1)/(T)`
It is a straight LINE equation (y= c + mx)

slope `=(-E_a)/(2.303R)or E_a="slope"xx(-2.303R)`
Discussion
9763.

Which of the following inert gas is highly reactive ?

Answer»

He
Ne
Ar
Xe

Answer :D
Discussion
9764.

What is the compound called if remaining two valencies of a carbonyl group are satisfied by two alkyl groups

Answer»

Aldehyde
Ketone
Acid
Acid chloride

Answer :B
Discussion
9765.

What are carbylamines ?

Answer»

SOLUTION :Organic COMPOUNDS in which N-atom of isocyanide or carbylamine group `(-N OVERSET( to )= C )` is linked to C-atom of an alkyl or ARYL group are called carbylamines.
Discussion
9766.

Which solvent is used to dissolve cellulose ?

Answer»

ETHANOL
WATER
Acetonitrile
AMMONICAL `CU(OH)_(2)` solution.

Solution :Ammonical `Cu(OH)_(2)` solution.
Discussion
9767.

Under the same reaction conditions, initial concentration of 1.386 "mol dm"^(-3) of a substance becomes half in 40 seconds and 20 seconds through first order and zero order kinetics, respectively. Ratio ((k_(1))/(k_(0))) of the rate constant for first order (k_(1)) and zero order (k_(0)) of the reaction is :

Answer»

`0.5"MOL"^(-1)"DM"^(-3)`
`1.0"mol"^(-1)"dm"^(-3)`
`1.5"mol"^(-1)"dm"^(-3)`
`2.0"mol"^(-1)"dm"^(-3)`

ANSWER :A
Discussion
9768.

What are nitriles ?

Answer»

Solution :ALKYL or ARYL DERIVATIVES of HCN are called NITRILES.
Discussion
9769.

Which one of the following can not be the product during dehydration of following alcohol ?

Answer»




SOLUTION :N//A
Discussion
9770.

Which of the following statements regarding ozone is not correct ?

Answer»

ozone molecule is ANGULAR in shape
ozone molecule is hybrid of two contributing structures
oxygen-oxygen bond length in ozone is IDENTICAL with that of molecular oxygen
ozone is used as germicide and DISINFECTANT for the purification of air .

SOLUTION :Oxygen-oxygen bond length (127.8pm) in ozone molecule is more than the bond length (110 pm) is oxygen molecule.
Discussion
9771.

What characteristic is at best common to both cis-2-butene , and trans-2-butene ?

Answer»

boiling POINT
DIPOLE moment
HEAT of hydrogenation
product of hydrogenation

Answer :D
Discussion
9772.

The structure of compound when aniline reacts with NaNO_2 in presence of HCl in cold :

Answer»

`NH_2Cl`
`C_6H_5N=NCl`
N (EQUIV) N
`C_6H_5NHNHC_6H_5`

ANSWER :B
Discussion
9773.

Which of the following complexes will show jahn-Teller distortion?

Answer»

`[CU(H_2O)_6]^(2+)`
`[Cr(H_2O)_6]^(3+)`
`[Mn(H_2O)_6]^(2+)`
`[CO(H_2O)_6]^(3+)`

ANSWER :A
Discussion
9774.

Which of the following will have highest boiling point ?

Answer»

`0.1 M FeCl_3`
`0.1` M Urea
0.1 M NACL
0.1 M Glucose.

Solution :`0.1 M FeCl_3`
Discussion
9775.

Which one of the following is used in cellular phones, Laptop computers and in digital camera?

Answer»

Mercury button cell
Lithium - ion BATTERY
`H_2O_2` fuel cell
Leclanche cell

ANSWER :B
Discussion
9776.

Which of the following is correct match ?

Answer»

A-ii-III
B-ii-III
C-ii-III
D-ii-III

Answer :D
Discussion
9777.

Write down the preparation, properties and used of Neoprene.

Answer»

Solution :Preparation : Neoprene or polychloroprene is formed by the FREE radical polymerization of chloroprene.
`underset("1, 3 - butadiene")underset("2 - CHLORO -")underset("Chloroprene")(nCH_(2)=overset(Cl)overset(|)C)-CH=CH_(2)overset("Polymerization")rarrunderset("Neoprene")([--CH_(2)-overset(Cl)overset(|)C=CH-CH_(2)--]_(n))`
Properties : It has superior resistance to vegetable and mineral oils.
Uses : It is used for manufacturing conveyor belts, gaskets and hoses.
Discussion
9778.

Which of the following is not a natural polymer

Answer»

Cellulose
PROTEIN
PVC
NUCLEIC acid

Answer :C
Discussion
9779.

When Zinc piece is kept in CuSO_4 solution the copper gets precipitated due to standard potential of Zinc is ………….. .

Answer»

GT copper
lt copper
gt sulphate
lt sulphate

Solution :STANDARD POTENTIAL of ZINC < copper
Discussion
9780.

Which of the following is laevorotatory :

Answer»

Glucose
Fructose
Sucrose
NONE

ANSWER :B
Discussion
9781.

Which of the following is correct match ?

Answer»

A-i-II
B-ii-I
C-iii-IV
D-iv-III

Answer :A
Discussion
9782.

Which one of the following represents the reaction between fluorine and cold dilute NaOH ?

Answer»

`2F_(2) + 4NaOH rarr 4NaF + 2H_(2)O`
`3F_(2) + NaOH rarr 5NaF + NaFO_(3)`
`F_(2) + 2NAOH rarr NaF + NaOF + H_(2) O`
`2F_(2) + 2NaOH rarr 2NaF +OF_(2) + H_(2)O`

Answer :D
Discussion
9783.

Which chloroderivative of benzene among the following would undergo hydrolysis most readily with aqueous sodium hydroxide to furnish the corresponding hydroxyderivative ?

Answer»




ANSWER :A
Discussion
9784.

Which of the following are soluble in water

Answer»

`alpha`-KERATIN
ALBUMIN
Haemoglobin
Casein

Solution :(b), (c) and (d) are soluble in water BECAUSETHEY are globular proteins which are soluble in water.
(a) is not correct because `alpha`-keratin is fibrous PROTEIN insoluble in water.
Discussion
9785.

Write IUPAC name for the linkage isomer of [Co(NH_(3))_(5)ONO]Cl_(2).

Answer»

SOLUTION :Pentaamminenitrito-O-cobalt(III) CHLORIDE.
Discussion
9786.

Which linkage is proper for nucleotide ?

Answer»

Sugar-Base
Sugar-Base-Phosphate
Base-Phosphate
Phosphate-Sugar-Base

SOLUTION :Sugar-Base-Phosphate
Discussion
9787.

The same amount of electricity was passed through two separate electrolyic cells containing solutions of nickel nitrate and chromium nitrate respectively.If 0.3 g of nickel was deposited in the first cell, the amount of chormium deposited is : (at. wt. Ni = 59,Cr=52)

Answer»

`0.1g`
`0.17 G`
`0.3 g`
`0.6 g`

ANSWER :B
Discussion
9788.

Which among the following is a basic flux

Answer»

<P>Borax
CaO
`SiO_(2)`
`P_(2)O_(5)`

ANSWER :2
Discussion
9789.

Which of the following gives violet colour with conc. HCl ?

Answer»

FRUCTOSE
GLUCOSE
MALTOSE
Starch

Answer :B
Discussion
9790.

Which element possesses highest electron affinity?

Answer»

SOLUTION :CHLORINE
Discussion
9791.

Which of the following is most basic towards B(CH_(3))_(3)

Answer»

`4-CH_(3)C_(5)H_(4)N`
`(C_(2)H_(5))_(3)N`
`NH_(3)`
`2-CH_(3)C_(5)H_(4)N`

Solution :It is easier to remove a proton from 4-methylpyridine, and the electron left behind when the proton is removed is delocalized ONTO the ELECTRONEGATIVE nitrogen atom. In 2-methylpyridine, electron can be delocalized only onto the carbon atom.
Discussion
9792.

Which halogen gives a brown colour with starch

Answer»

`F_2`
`Cl_2`
`Br_2`
`I_2`

ANSWER :C
Discussion
9793.

Which of the following is not an example of an emulsifying agent ?

Answer»

PROTEINS
GUMS
SOAPS
Electrolytes

Answer :D
Discussion
9794.

What is X in the following reaction2CH_3 CHOoverset(dil NaOH)toX

Answer»

`CH_(3)-CH(OH)-CHO`
`CH_(3)-CO-CH_(2)CHO`
`CH_(3)-CH(OH)-CH_(2)-CHO`
`CH_(3)-CH_(2)-CH(OH)-CHO`

ANSWER :C
Discussion
9795.

Write the principle of the following : Froth floatation process.

Answer»

Solution :This method is used for the concentration of sulphide ore. A SUSPENSION of the powdered ore is made with water. COLLECTORS and stabilisers are added to it. The mineral particles become wet by oils while the gangue particles by water. A rotating PADDLE agitates the mixture and draws air. A froth is formed which CARRIES the mineral particles to the top from where it is collected.
Discussion
9796.

Which of the following statements for the order of a reaction is incorrect ?

Answer»

Order of reaction is ALWAYS WHOLE number
Order can be DETERMINED only experimentally
Order is not INFLUENCED by stoichiometric coefficient of the reactants
Order of reaction is sum of power to the concentration TERMS of reactants to express the rate of reaction

Answer :A
Discussion
9797.

The values of DeltaH for the combustion of ethene and ethyne are -341.1 and -310.0 kcal respectively. Which of the following is a better fuel

Answer»

`C_(2)H_(2)`
`C_(2)H_(4)`
Both of these
None of these

Solution :`DELTAH" for "C_(2)H_(4)=-341.1 K cal`
its calorific value = `(-341.1)/(28)=-12.1 KCAL//g`.
`DeltaH` for `C_(2)H_(2)` =-310.0 kcal
its Calorific value = `(-310.0)/(26)=-11.92`,
hence `C_(2)H_(2)` is a better FUEL.
Discussion
9798.

Which of the following carbohydrate is found most abundantly in nature ?

Answer»

Glucose
FRUCTOSE
STARCH
CELLULOSE.

Answer :C
Discussion
9799.

Which of the folloing pairs represents linkage isomers ?

Answer»

`[PD(P Ph_(3))_(2) (NCS)_(2)] and [Pd(P Ph_(3))_(2)(SCN)_(2)]`
`[Co(NH_(3))_(5)NO_(3)]SO_(4) and [Co(NH_(3))_(5)SO_(4)]NO_(3)`
`[PtCl_(2)(NH_(3))_(4)Br_(2) and[PtBr_(2) (NH_(3))_(4)]Cl_(2)`
`[Cu(NH_(3))_(4)][PtCl_(4)] and [Pt(NH_(3))_(4)][CuCl_(4)]`

SOLUTION :Linkage isomerism exhibit in presence of ambidentable ligand
`NCS^(-) to SCN`
Discussion
9800.

Whichof the followingwill reduceTollen's reagentand Fehling 's solution ?

Answer»

GLUCOSE
FRUCTOSE
SURCOSE
MALTOSE

ANSWER :A
Discussion