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501.

Write the products

Answer»

SOLUTION :
Discussion
502.

Write the products

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SOLUTION :
Discussion
503.

Write the products

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SOLUTION :
Discussion
504.

The value of slope and intercept in the graph of Freundlich adsorption isotherm at 25^(@) C temperature are 0.5 and 0.4771 respectively.What will be the propertion of adsorption at 4 bar pressure?

Answer»

6
3
24
12

Solution :log `(X)/(m)`=log `k+(1)/(N)` log p
Here, log k=0.4771
`therefore` k=3
`(1)/(n)`=0.5
`therefore (x)/(m)=(3)(4)^(0.5)=3xx(4)^((1)/(2))`
`=3xxsqrt(4)=3xx2=6`
Discussion
505.

What are fuel cells ? Write the electrode reactions of a fuel cell which uses the reaction of hydrogen with oxygen?

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Solution :A FUEL CELL is similar to a galvanic cell, it generates electricity directly by the electrochemical CONVERSION of GASEOUS or liquid fuels fed into the cell as REQUIRED.
At anode : `H_2(g) + 2OH(aq) to 2H_2O(l) + 2e^(-)`
At cathode : `O_2(g) + 2H_2O(l) + 4e^(-) to 4OH^(-)(aq)`
Overall reaction : `2H_2(g) + O_(2)(g) to 2H_2O(l)`.
Discussion
506.

Which of the following compounds will not undergo cannizaro reaction, when treated with 50% aqueous alkali?

Answer»

`Ph-overset(O)overset(||)(C)-H`

`Me_(2)CHCHO`
`Ph-CH_(2)-CHO`

Solution :(c) EXCEPTION although it has `alpha`-hydrogen it undergocannizzaro reaction.
(d) `Ph-CH_(2)-CHO` (due to presence of `alpha`-Hydrogen it will not under go CANNIZZARO reaction).
Discussion
507.

Which of the following is a polycarbonate ?

Answer»

PAN
Acrilan
LEXAN
BUNA - S

Answer :C
Discussion
508.

What is the volume of CO_2liberated (in litres)at 1 atmosphere and 0^@Cwhen 10 g of 100% pure calcium carbonate is treated with excess dilute sulphuric acid ? (Atomic mass Ca = 40, C = 12, O = 16)

Answer»

0.224
2.24
22.4
224

Solution :`underset("1MOL(100 g)")(CaCO_3) + H_2SO_4 to CaSO_4+ H_2O+ underset("1mol (22.4L) )(CO_2)`
100 g of `CaCO_3` liberate `CO_2 = 22.4 L`
10 g of `CaCO_3` will liberate `CO_2 = (22.4)/(100) XX 10 = 2.24 L `
Discussion
509.

What istheroleofcollectorsin frothfloatationprocess ? Giveanexampleofacollector.

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SOLUTION :Substancessuchaspineoil, xanthatesandfattyacidswhichenhancethe NON -wettabilityoftheoreparticlestherebyindirectlyfavouringfrothformationare calledcollectors.
Discussion
510.

Which of the following compounds will show geometrical isomerism ?

Answer»

2-Butene
Propene
1- Phenylpropene
2- Metyl-2-butene

Solution :(a,C) :`CH_(3) - underset("But - 2 - ENE")OVERSET(H)overset(|)(C= ) overset(H) overset(|)(C)- CH_(3) "" H - underset("1-Phenylpropene")overset(C_(6)H_(5))overset(|)(C = ) overset(H)overset(|)(C) - CH_(3)`
Both (a) and (c) will show geometrical isomerism.
Discussion
511.

Oxidation number of sulpher in caro's acid

Answer»

`SP^(2), +10`
`sp^(3), +10`
`sp^(2), +6`
`sp^(3),+6`

SOLUTION :`H-O-underset(O)underset(||)overset(O)overset(||)S-O-O-H""H-O-underset(O)underset(||)overset(O)overset(||)S-O-O-underset(O)underset(||)overset(O)overset(||)S-OH`
Discussion
512.

Which of the following is/are correct for a solution of a particular concerntration ?

Answer»

MOLARITY is always less than molality
Formality is EQUIVALENT to molarity
Mole fraction is equivalent to mass fraction
Normality of `H_(2)SO_(4)` solution is double than its molarity.

Solution :(b,d) are both correct STATEMENTS.
Discussion
513.

Which of the following will produce only one product on reduction with LiAlH_(4)?

Answer»

`CH_(3)OCOCH_(2)CH_(3)`
`CH_(3)CH_(2)OCOCH_(2)CH_(3)`
`CH_(3)CH_(2)OCOCH_(3)`
`CH_(3)CH_(2)OCOCH_(2)CH_(2)CH_(3)`

SOLUTION :esters having the same number of CARBON ATOMS in the alkyl and acyl GROUP, i.e., `CH_(3)CH_(2)` and `COCH_(3)` groups in `CH_(3)CH_(2)OCOCH_(3)`.
Discussion
514.

Which of the following hladies is capable of exhibitin enantiomerism?

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ETHYL chloride
Isopropyl bromide
sec-Butyl iodide
tert-Butyl chloride

Solution :`CH_(3) CH_(2) underset("sec-Butyl iodide")underset(I) underset(|)(OVERSET(o+)(C) HCH_(3)`
Contains asymmetric `C` atom, while others do not have.
Discussion
515.

Which one of the following can beused in place of Nh_(4)CIfor identificationof thethird groupradicals?

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NACI
`(NH_(4))_(2)SO_(4)`
`(NH_(4))_(2)CO_(3)`
`NH_(4)NO_(3)`

ANSWER :d
Discussion
516.

Which of the following salt does give positive test for nitrate ion?

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`KNO_(3)`
`NaNO_(3)`
`MG(NO_(3))_(2)`
NONE of these

Answer :a,b,C
Discussion
517.

Which one is not a p-block element ?

Answer»

Sr
Po
As
Ga

Answer :A
Discussion
518.

Which of following property is correctly given ?

Answer»

N LT P lt As lt Sb `(IP_1)`
`Na^(+) GT F^(-)gt O^(-2) gt N^(-3)` (Size )
O gt F gt N gt C `(IP​_2​) `
P gt SI gt Mg gt Al (Covalent RADII)

Answer :C
Discussion
519.

Which of the following is not obtained by direct reaction of constituent elements

Answer»

`XeF_(2)`
`XeF_(4)`
`XeO_(3)`
`XeF_(6)`

SOLUTION :`XeF_(2),XeF_(4) & XeF_(6)` can be directly prepared.
`Xe+ F_(2) OVERSET("Ni TUBE")underset(673 K)to XeF_(2) , Xe + 2F_(2) overset(673 K)underset(6 atm)to XeF_(4)`
`Xe +3 F_(2) underset(50-60 atm) overset( 523-573 K)to XeF_(6)`
`XeO_(3) ` is obtained by the hydrolysis of `XeF_(6)`
`XeF_(6)+ 3H_(2)O to XeO_(3) + 6HF`
Discussion
520.

Which of the following ion has maximum magnetic moment?

Answer»

`Mn^(2+)`
`Fe^(2+)`
`Ti^(2+)`
`CR^(2+)`

Solution :`Mn^(2+)(5),Fe^(2+)(4),Ti^(2+)(d^(2)),(Cr^(2+)(4)`. `Mn^(2+)` has MAXIMUM NUMBER of unpaired electrons and hene maximum magnetic MOMENT.
Discussion
521.

Which of the following ions has a magnetic moment of 5.93 BM ?

Answer»

`Mn^(2+)`
`FE^(2+)`
`Cr^(2+)`
`V^(3+)`

Solution :`sqrt(N(n+2)) = 5.93 or n = 5`
`THEREFORE Mn^(2+)` ION `(3D^(5))` has magnetic moment of 5.93 BM.
Discussion
522.

Which one of the following is an example for schottky defect ?

Answer»

`NACL `
`AGBR`
`KCI`
`FES`

ANSWER :A
Discussion
523.

Which of the following reagent or process are suitable to distinguish MeOH and EtOH ?

Answer»

NaOI

anhydrous `ZnCl_(2)+`conc.HCl
Voctor Meyer's process

Solution :ETOH gives +ve test with NaOI (i.e., haloform)but not `CH_(3)OH`. Only MeOH gives +ve test with ALICYLIC acid and FORM winterr OIL green.
Discussion
524.

Which of the following is a natural polymer? Buna-S, Proteins, PVC

Answer»

SOLUTION :PROTEINS
Discussion
525.

Which is colourless in water (H_2O)?

Answer»

`TI^(3+)`
`V^(3+)`
`CR^(3+)`
`Sc^(3+)`

Answer :D
Discussion
526.

Write the electronic configuration of last but one element of 3d series.

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Solution :`Cu_(29)- 1S^(2)2S^(2)2P^(6)3s^(2)3p^(6)4s^(1)3d^(10)`
Discussion
527.

The structure of aspirin is_______ .

Answer»




ANSWER :A
Discussion
528.

Which of the following will gives good yield of ether?

Answer»




ANSWER :B
Discussion
529.

The reciprocal of specific resistance is called __________.

Answer»

conductance
specific conductance
conductivity
both (B) and (C)

ANSWER :D
Discussion
530.

What mass of isobutylene is obtained from 37g of tertiary butyl alcohol heating with 20% H_2 SO_4 at 363 K, if the yield is 65%

Answer»

A) 18.2 g
B) 16 g
C) 22 g
D) 20 g

Answer :A
Discussion
531.

Which one of the following is used a lubricant?

Answer»

GRAPHITE
Diamond
Fullerene
Graphene

Answer :A
Discussion
532.

Which one of the following is called a carbylamine ?

Answer»

`RCN`
`RCONH_2`
`RCH=NH`
`RNC`

ANSWER :D
Discussion
533.

Which one is a purine base ?

Answer»

URACIL
THYMINE
CYTOSINE
GUANINE

SOLUTION :Guanine
Discussion
534.

Whichof the followingpolymers of soften on heatingand hardenon cooling? Whatare the polymers with thisproperty collectively called ? What are the structural similarities between such polymers ?

Answer»

Solution :Polythene , polyvinyls and POLYSTYRENE softenon heatingand HARDEN on cooling . Suchpolymers and calledthermoplastic POLYMERS . Thesepolymers are linearor slightly BRANCHED long chain moleculues . Theypossess intermolecular forces whosestrenghtlies betweenstrenghtofintermolecular forcesof elastomersand fibres .
Discussion
535.

Which of the following are not true about voids formed in three dimensional hexagonal close packed structure?

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A tetrahedral void is formed when a sphere of the second layer is present above TRIANGULAR void in the FIRST layer.
All the triangular voids are not covered by the spheres of the second layer.
Tetrahedral voids are formed when the triangular voids in the second layer lie above the triangular voids in the first layer and the triangular shapes of these voids do not OVERLAP.
OCTAHEDRAL voids are formed when the triangular voids in the second layer exactly overlap with similar voids in the first layer.

Solution :Tetrahedral voids are formed when the triangular voids in the second layer lie exactly above the triangular voids in the first layer and the triangular shape of these voids oppositely overlap.

Octahedral voids are formed when triangular void of second layer does not exactly overlap with similar void in first layer.
Discussion
536.

Which one of the following is called adsorbate?

Answer»

Charcoal
Silica gel
AMMONIA
Magnesia

Solution :Ammonia
Discussion
537.

The vapour pressure of a pure liquid A is 40 mm of Hg at 310K. The vapour pressure of its liquid in a solution with liquid B is 32 mm of Hg. Mole fraction of A in the solution, if it obeys Raoult's law is :

Answer»

0.8
0.5
0.2
0.4

Answer :A
Discussion
538.

Therelativeof 1^(@):2^(@):3^(@)hydrogento brominationis 1:82 :1600. Calculaterelativeamountof each product on monobrominationof iso- butane .

Answer»


SOLUTION :
Discussion
539.

What do you understand by the rate law and rate constant of a reaction? Identity the order of a reaction if the units of its rate constant are: (i) L^(-1)"mol s"^(-1)"" (ii) "L mol"^(-1)s^(-1)

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Solution :Rate law is the expression in which reaction rate is given in terms of molar concentration of reactants with each TERM raised to some power, which MAY or may not be the same as the stoichiometric coefficient of the REACTING species in a blanced chemical equation.
Rate `prop [A]^(X)[B]^(y)`
or Rate `=k[A]^(x)[B]^(y)`
where k = rate constant
When `[A]=[B]=1`
Then, Rate = k
Thus, rate constant is the rate of the reaction when the concentration of each reactant in the reaction is UNITY.
Order of the reaction
(i) `L^(-1)"mol s"^(-1) -` Zero order. (ii) `"L mol"^(-1)s^(-1)-` Second order.
Discussion
540.

The rose odour from an ester is formed by the action of HCOOH on

Answer»

TURPENTINE oil
Olive oil
Geraniol
Pine oil

Solution :`C_(10)H_(17)OH` (Geraniol) a liquid terpene alcohol forms ester of ROSE ODOUR with HCOOH.
Discussion
541.

What is the role of activated charcoal in gas mask used in coal mines?

Answer»

Solution :ACTIVATED CHARCOAL adsorbs POISONOUS gases PRESENT in coal mines.
Discussion
542.

Which of the following group would enhance the reactivity of electrophile aromatic substiution

Answer»

`-NO_(2)`
`-CH_(3)`
`-CN`
`-CHO`

ANSWER :B
Discussion
543.

Which of the following is not prepared directly from benzene ?

Answer»

CHLOROBENZENE
Bromobenzene
Methylbenzene
FLUOROBENZENE

ANSWER :D
Discussion
544.

What is the dimension of Planck's constant?

Answer»

FORCE `XX` time
energy `xx` DISTANCE
energy/frequency
energy/time

Answer :C
Discussion
545.

The tripeptide Hormone present in most living cells is…

Answer»

Glutathione
Glutamine
Oxytocin
Ptyalin

Answer :A
Discussion
546.

The temperature at which the second virial coefficient of a real gas is zero is called :

Answer»

CRITICAL pressure
Eutectic point
Boiling point
Boyle's temperature

Answer :D
Discussion
547.

The volume of 0.6 M NaOH required to neutralise 30 cm^(3) of 0.4 M HCl is

Answer»

`40cm^(3)`
`30CM^(3)`
`20CM^(3)`
`10cm^(3)`

SOLUTION :Normality=molarity`XX`basicity or acidity (for HCl)
`N_(2)=0.4xx1=0.4N` basicity=1 (for NaoH acidity=1)
`N_(1)=0.6xx1=0.6N,V_(1)=?,V_(2)=30cm^(3)`
From the equation, `N_(1)V_(1)=N_(2)V_(2)`
`0.6xxV_(1)=0.4xx30`
`V_(1)=(0.4xx30)/(0.6)=20cm^(3)`
Discussion
548.

TNT is :

Answer»

2,4-dinitrotoluene
1,2,3,-trinitrotoluene
2,4,6-trinitrotoluene
3,4,6-trinitrotoluene

Answer :C
Discussion
549.

What is polymerization? Give an example of polymerization reaction.

Answer»

Solution :Polymerization: The process of formationof POLYMERS from respective monomers is called polymerization.
)(or)
A large molecular weight complex compound which is formed by the REPEATED combination of simple units is called polymer.This process is called polymerisation.
E.g. : Formation of polyethene form ETHENE and reaction of HEXAMETHYLENE diamine and adipic ACID leading to the formation of Nylon 6,6 are examples of two different types of polymerisation reactions .
Discussion
550.

The standard oxidation potential of Ni//Ni^(2+) electrode is 0.236 V .If this is combined with a hydrogen electrode in acid solution , at what pH of this solution will be measured e.m.f be zero at25^@ C ? Assume that [Ni^(2+)] = 1M and P_(H_2) = 1 atm

Answer»


Solution :`Ni_((s)) + 2H^(+) to Ni^(+2) + H_2 , E= E^(0) - (0.059)/(2) log([Ni^(+2)]PH_2)/([H^(+)]^(2))`
` 0.0236 - (0.059)/(2) log [H^(+)]^(2) , 0.059 PH = 0.236, pH = 4 `
Discussion