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5151.

Which of the following imparts green/apple green colour to the Bunsen flame ?

Answer»

Calcium CHLORIDE
VOLATILE boron trifluoride
Barium chloride
Ethyl borate

Solution :`BF_(3)` colour the flame green , `B(OC_(2)H_(5))_(3)` burns with green edged flame , Barium chloride (volatile) gives apple green colour to flame.
Discussion
5152.

Which one of the following sets of ions represents the collection of isoelectronic species?

Answer»

`K^(+), Ca^(2+), Sc^(3+), Cl^(-)`
`Na^(+), Ca^(2+), Sc^(3+), F^(-)`
`K^(+), Cl^(-), Mg^(2+), Sc^(3+)`
`Na^(+), Mg^(2+), AL^(3+), Cl^(-)`

Solution :Isoelectronic species are those which have same NUMBER of electrons.
`K^(+)= 19 -1 = 18 , Ca^(2+) = 20 - 2 = 18`
`Sc^(3+) = 21 - 3 = 18 , C^(-) = 17 + 1 = 18`
Discussion
5153.

What are polymers?

Answer»

SOLUTION :Polymers are high molecular MASS compounds containing very large MOLECULES FORMED by the joining of repeating structural UNITS.
Discussion
5154.

Which of the following aqueous solution will have maximum vapour pressure at constant temperature ?

Answer»

0.1 M NaCl
`0.1 M FeCl_(3)`
`0.1 M BaCl_(2)`
0.1 M Glucose

Solution :The number of PARTICLES of solute in solution `prop (1)/("Vapour pressure")`
The number of particles are the least in the solution of 0.1 M glucose due to dissociation does not TAKE place in it.
Discussion
5155.

While antacids and anti allergic drugs interfere with the function of histamines, why do these not interfere with the function of each other?

Answer»

Solution :Drugs designed to cure some ailment in one organ in the body do not affect the other because they work on different receptors. For example, secretion of HISTAMINE causes allergy. It also causes ACIDITY due to release of hydrochloric acid in the STOMACH. Since antiallergic and antacids drugs work on different receptors, therefore, antihistamines RELIEVE allergy while antacid remove acidity
Discussion
5156.

Which of the following reaction does not occur in the given galvanic cell. Al_((S))|Al_((aq))^(3+)(1M)||Ag_((aq))^(+)(1M)|Ag_((S))

Answer»

`AL^(3+)+3E^(-) to Al`
`Al to Al^(3+)+3e^(-)`
`3Ag^(+)+Al to Al^(3+)+3Ag`
`Ag^(+)+e^(-) to Ag`

SOLUTION :`Al^(3+)+3e^(-) to Al`
Discussion
5157.

Which of the following statement is correct here

Answer»

`AgBr` can show both Schottky and Frenkel defects
`ZNO` on heating shows METAL EXCESS defects
`MnO_2` is ferromagnetic substance
Both A and B are CORRECT

Answer :D
Discussion
5158.

What is the coordination number of Fe^(2+) in K_(4)[Fe(CN)_(6)] ?

Answer»

`4`
`6`
`3`
`2`

Answer :B
Discussion
5159.

Which condition is not satisfied by an ideal solution?

Answer»

`DeltaH_("MIX") = 0`
`DeltaV_("mix") = 0`
`DeltaP_("mix") = 0`
`DeltaS_("mix") = 0`

ANSWER :D
Discussion
5160.

Which one of the following is used to measure conductivity of ionic solutions?

Answer»

metre SCALE
wheat stone BRIDGE
Dynamo
Ammeter

Answer :B
Discussion
5161.

Why cannot aromatic primary amines be prepared by Gabriel phthalimide synthesis?

Answer»

Solution :The key step in the Gabriel phthalimide SYNTHESIS is a `S_(N)2` REACTION in which the nucleophile, phthalimide anion displaces the halide ion from alkyl halide to form N-alkylphthalimide. This upon subsequent acid or alkaline hydrolysis GIVES the corresponding aliphatic primary amine.


Since aryl halides do not undergo nucleophilic substitution reactions easily, therefore, arylamines, i.e., aromatic primary amines cannot be prepared by Gabriel phthalimide reactions.
Discussion
5162.

Which of the following is a good reducing agent?

Answer»

POTASSIUM dichromate
Ceric (IV) compounds
Eu(II) compounds
Acidic permanganate

Answer :C
Discussion
5163.

Which one of the following is expected to rotate the plane of plane polarised light.

Answer»




SOLUTION :
Discussion
5164.

Which two models of modern development were there before India on the eve of independence? Which model did India decide to choose and why?

Answer»

Solution :Two models of development before i) India Liberal Capitalist model in US and Europe and(II) socialist model in USSR.
India had two wings one very impressed with the USSR socialist model - Nehru and the communist party of India as they saw poverty alleviation and social economic redistribution the prime concern and PRIMARY responsibility of the Government. India adopted the Mixed model a PLANNED economy with STATE intervention in the Public sector which had the large industries.
ANY OTHER RELEVANT POINT.
Discussion
5165.

What type of polymer is represented by the following segment ? -overset(O)overset(||)C-CH_2CH_2-overset(O)overset(||)C-OCH_2CH_2CH_2O-

Answer»

polyamide FIBRES
Polyester
Polyolefin
Polyethylene

Solution :The GIVEN sagment has the ester linkage, -COO- therefore , the POLYMER is a polyester .
Discussion
5166.

Which of the following names are correctly written against them ?

Answer»

`rarr` hexa-1, 4-dien-3-amine
`rarr` 1-carbamoyle ETHANE
`rarr` 2,4-dimethyl-5-oxopentanoyl CHLORIDE
`rarr` 1, 5-Diamino-4-hydroxy hex -2-en-1-one

Answer :A::C::D
Discussion
5167.

Which of the following is not an addition homopolymer ?

Answer»

SBR
Natural rubber
Toflon
PVC

Answer :A
Discussion
5168.

Write the IUPAC names of : (i) (C_(2)H_(5))_(2) CHOC_(2)H_(5) (ii) CH_(3)CH_(2)O-CH=CH_(2) (iii) CH_(3)-underset(CH_(3))underset(|)(CH)-O-underset(CH_(3))underset(|)(CH)-CH_(3) (iv) CH_(3)O-CH_(2)-CH_(2)-OCH_(3) (v) (vi) CH_(3)-underset(CH_(3))underset(|)overset(O_(2)H_(5))overset(|)C-OH (vii) CH_(3)CH_(2)O-underset(CH_(3))(CH)-CH_(2)-CH_(3) (viii) CH_(3)-O-CH_(2)-underset(CH_(3))underset(|)(CH)-CH_(2)-CH_(3)

Answer»

Solution :(i) 3-Ethoxypentane
(ii) Ethoxyethene
(III) 2-(2propoxy) propane
(IV) 2-2-Dimethoxyethane
(v) ETHOXYBENZENE
(vi) 2-Ethoxypropan-2-ol
(vii) 2-Ethoxybutane
(viii) 1-Methoxy-2-methylbutane.
Discussion
5169.

Cyclohexylamine is stronger base than aniline because

Answer»

Solution :The lone pair of electrons on nitrogen in aniline is delocalized DUE to resonance with benzene RING. Thus, electron density on `-NH_2` group in aniline is decreased. There is no such EFFECT in cyclohexylamine. Therefore, aniline is a weaker BASE than cyclohexylamine.
Discussion
5170.

Write onecharacteristic of lyophilic sol.

Answer»
Discussion
5171.

What is the empirical formula of vanadium oxide if 2.74 g of metal oxide contains 1.53g of metal?

Answer»

`V_(2)O_(3)`
VO
`V_(2)O_(5)`
`V_(2)O_(7)`

Solution :% of `V=(1.53)/(2.74)xx100=55.83`
`therefore % "of" O=44.17`
`{:("Element",%,"Atomic ratio","SIMPLEST ratio"),(V,55.83,(55.83)/(52)=1.1,(1.1)/(1.1)=1),(O,44.17,(44.17)/(16)=2.76,(2.76)/(1.1)=2.5):}`
`V:O=2:5`
Thus, empirical formula =`V_(2)O_(5)`.
Discussion
5172.

Zinc is obtained on large scale by :

Answer»

ELECTROLYSIS of `ZnCI_2`
REDUCTION of ZnO
Precipitation with AG
All are correct

Answer :B
Discussion
5173.

Which of the following anion may be identified by their ppt reaction in aqueous solution ?

Answer»

`CrO_(4)^(2-)`
`SO_(4)^(2-)`
`PO_(4)^(3-)`
`MnO_(4)^(Theta)`

Answer :a,B,c
Discussion
5174.

The valence shell electronic configuration of VA group elements is :

Answer»

`ns^(2)NP^(2)`
`ns^(2)np^(1)`
`ns^(2)np^(3)`
`ns^(2)np^(5)`

ANSWER :3
Discussion
5175.

What is the formula and method of preparation of Hypophosphoric oxyacid?

Answer»

`H_(4)P_(2)O_(6),"white"P_(4)+"ALKALI"`
`H_(4)P_(2)O_(5)," red "P_(4)+"alkali"`
`H_(4)P_(2)O_(5)," white "P_(4)+"alkali"`
`H_(4)P_(2)O_(6)," red "P_(4)+"alkali"`

SOLUTION :Red phosphorus undergoes disproportionation on reaction with alkali to form `H_(4)P_(2)O_(6) and PH_(3)`
Discussion
5176.

What is the value of slope of graph log_(10)Kto(1)/(T)?

Answer»

`-(K)/(2.303)`
`-(E_(a))/(2.303R)`
`-(E-(a))/(R)`
`-K`

Solution :According to ARRHENIUS
`k=e^(-E_(a)//RT)`
`therefore` In k=`-(E_(a))/(R )`+In A


`therefore` If the graph of log k`to(1)/(T)` is to be drawn then , SLOPE =`-(E_(a))/(2.303R)` and intersection =A
Discussion
5177.

Which of the following correct?

Answer»

`Ti(NO_(3))_(4)` is coloured
`[CR(NH_(3))_(6)]Cl_(3)` is colourless
`K_(3)[VF_(6)]` is colourless
`[Cu(NC CH_(3))_(4)] [BF_(4)]` is colourless

Solution :`[Cr(NH_(3))_(6)]Cl_(3), Cr^(+3)=3d^(3)` coloured
Discussion
5178.

What happens when XeF_(6) reacts 2.5 M solution of NaOH?

Answer»

SOLUTION :When `XeF_(6)` reacts with 2.5 of `NaOH`, sodium per XENATE is obtained.
`2XeF_(6)+16NaOHrarr underset("(sodium perxenate)")(Na_(4)XeO_(6))+Xe+O_(2)+12NaF+8H_(2)O`
Discussion
5179.

Which of the following is the best leaving in a nucleophilic substitution reaction

Answer»

`F_3CSO_3^(-)` (triflate)
`H_3CSO_3^(-)` (mesylate)

ANSWER :A
Discussion
5180.

What is the half-life for the decomposition of NOCI when the concentration of NOCI is 0.15 M? The rate constant for the reaction is 8.0 xx 10^(-8) L "mol"^(-1) s^(-1)

Answer»

SOLUTION :`8.3 XX 10^7 s`
Discussion
5181.

What is the pH of 0.01 M glycine solution? For glycine K_(a_(1)) = 4.5 xx 10^(-3) and Ka_(2) = 1.7 xx 10^(-10) at 298 K

Answer»

`3.0`
`10.0`
6.1
7.2

Answer :C
Discussion
5182.

Which method is employed to convert alkyl halide into alcohol :

Answer»

Substitution
Addition
Dehydration
Rearrangement

Answer :A
Discussion
5183.

What is electrical conductivity in metals due to ?

Answer»

SOLUTION :It is DUE to the presence of free or MOBILE electrons.
Discussion
5184.

What are heterocyclic bases? Give an example of nitrogenous heterocyclic base.

Answer»

Solution :Cyclic compounds CONTAINING ELEMENTS other than carbon i.e., N, S, O at ring POSITION are CALLED heterocyclic compounds. Adenine is an example of heterocyclic compound.
Discussion
5185.

when 50 cm^3 of 0.2 N H_3SO_4 is mixed with 50 cm^3 of 1nKOH,the heat libereted is(Given H^+(aq)+OH^-(aq)rarrH_2O(l)Delta_neulH=-57.3kJ)

Answer»

`11.46`kJ
57.3kJ
0.563kJ
0.573kJ

Answer :D
Discussion
5186.

Which species is not known

Answer»

`XeF_6`
`XeF_4`
`XeO_3`
`KrF_6`

ANSWER :D
Discussion
5187.

Which of the following is an amphoteric acid?

Answer»

GLYCINE
salicylic acid
benzoic acid
citric acid

Solution :Glycine is an AMPHOTERIC acid as it CONTAINS both acidic as well as basic GROUPS
Discussion
5188.

Which of the foollowing statements is correct regarding the slag obtained the extraction of a metal like copper or iron?

Answer»

The slag is LIGHTER and has HIGHER melting point than the metal.
The slag is lighter and has lower melting point than the metal.
The slag is HEAVIER and has higher melting point than the metal.
The slag is heavier and has lower melting point than the metal.

ANSWER :C
Discussion
5189.

Which element exist as a solid at 25^@C and 1 atmospheric pressure among the following

Answer»

Br
Cl
Hg
P

Solution :Phorphorus EXIST as solid at `27^(@)C` and 1 atmospheric PRESSURE (m.p. of white phosphorus =`44^(@)C`)
Discussion
5190.

What happens when i. 2-Nitropropane boiled with HCl ii. Nitrobenzene electrolytic reduction in strongly acidic medium.

Answer»

Solution :i. 2-Nitropropane boiled with HCl: 2-nitropropane UPON hydrolysis with boiling HCl give a ketone (2-propanone) and NITROUS oxide.

ii. Nitrobenezen electrolytic reduction in strongly acidic medium: Electrolytic reduction of nitrobenzene in weakly acidic medium gives aniline but in strongly acidic medium, it gives p-aminophenol OBVIOUSLY through the acid - catalysed REARRANGEMENT of the INITIALLY formed phenylhydroxylamine.
Discussion
5191.

Thennal decomposition of [CH_(3)CH_(2)-underset(CH_(3))underset(|)overset(NH_(3))overset(|)(N)-underset(CH_(3))underset(|)C(CH_(3))_(2)]OH^(-) gives

Answer»

`CH_(3)CH=CH_(2)`
`CH_(2)=CH_(2)`
`CH_(3)-CH_(3)`
`CH_(3)CH_(2)CH_(3)`

ANSWER :B
Discussion
5192.

Write the expression relating solubility and solubility product of AB_(2) type salts.

Answer»

SOLUTION :`K_(SP) = 4S^(3) or S = 3sqrt((K_(SP))/(4))` .
Discussion
5193.

Whathappens whenfructoseis treated withsodiumamalgan and water ?

Answer»

SOLUTION :When fructoseis TREATED with sodiumamalgam and water ,particalreductiontake placeand theproductsformedare epmiersof sorbitolan mannnitol . NEW asymmetriccarbonis formedat C -2 . This reactionconfirmsthe PRESENCEOF keto groupin FRUCTOSE .
Discussion
5194.

Which of the following isomerism is not possible for complex having molecular formulae: (i) Pt(SCN)_(2)*3PE t_(3) (ii) CoBr*SO_(4)*5NH_(3) (iii) FeCl_(2)*6H_(2)O

Answer»

Optical
Linkage
Ionisation
Hydrate

Solution :(i) PT `(SCN)_(2)`
Discussion
5195.

Total number of nitrogen atoms present in reduced product obtained by reducting nitrobenzene using LiAlH_(4) followed by aqueous work up is.

Answer»


SOLUTION :
AZOBENZENE has TWO NITROGEN ATOMS.
Discussion
5196.

Which of the plots of ln K vs (1/T) is/are correct?

Answer»




SOLUTION :`DELTAG^(@) = -RT ln K_(EQ) = DeltaH^(@) - T DeltaS^(@)`
ln `K_(eq) = (-DeltaH^(@))/R.1/T +(DeltaS^(@))/R`
Slope `=(-DeltaH^(@))/R, y1` in tercept `t=(DeltaS^(@))/R`
Discussion
5197.

What is the name of the reaction of alcoholic KOH with Benzaldehyde?

Answer»

CANNIZARO REACTION
Perkin's reaction
BENZOIN condensation
Aldol condensation

SOLUTION :Benzoin condensation
Discussion
5198.

What are natural and synthetic polymers ? Give two examples of each type.

Answer»

Solution :Natural polymers: Polymers which are found in NATURE, i.e, in animals and plants are called natural polymers. For example, proteins, STARCH, CELLULOSE, RESINS and rubber.
Synthetic polymers: MAN made polymers prepared in the laboratory and industry are called synthetic polymers. For example, plastics (polythene, PVC), synthetic fibres, (polyester, nylon 6,6), synthetic rubber (neoprene, Buna-S), etc.
Discussion
5199.

Which of the following is used as depressant in froth floatation process.

Answer»

Amyl xanthate
pine oil
`CuSO_(4)`
KCN

Solution :KCNIS USED as depresent in FROTH floatation process.
Discussion
5200.

The yield of acetanilide in the reaction (100% conversion) of 2 moles of aniline with 1 mole of acetic anhydride is

Answer»

270 g
135 g
67.5 g
177 g

Solution :
`{:("Init. :",2,1,0,0),("moles",,,,),("After :",1,0,1,1),("reaction",,,,):}`
1 mole of ACETANILIDE = 135G
Discussion