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15201.

The second ionisation potential of an element M is the energy required to

Answer»

REMOVE ONE mole of electron from one mole of gaseous anion
Remove one mole of electron from one mole of gaseous cation of the element
Remove one mole of electron from one mole of MONOVALENT gaseous cation of the element
Remove 2 moles of ELECTRONS from one mole of gaseous atoms

Answer :C
Discussion
15202.

Which of the following compounds will not undergo decomposition on passing electricity through aqueous solution

Answer»

SUGAR
SODIUM chloride
Sodium BROMIDE
Sodium Acetate

Solution :Because in it covalent BONDING is present.
Discussion
15203.

Which of the following procedures would be best for preparing isobutylisopropylamine, (CH_(3))_(2)CHNHCH_(2)CH(CH_(3))_(2)?

Answer»

`(CH_(3))_(2)CHBr+(CH_(3))_(2)CHCH_(2)NH_(2)`
(i) `(CH_(3))_(2)CHBr+(CH_(3))_(2)CHCONHNa` (ii) `LiAlH_(4)` in ETHER
(i) `(CH_(3))_(2)CHNH_(2)+(CH_(3))_(2)CHCH=O` (ii) `H_(2)` & PT
`(CH_(3))_(2)CHNH+(CH_(3))_(2)CHNH_(2)`

Solution :`CH_(3)-underset(CH_(3))underset(|)CH-Br+aN-NH-OVERSET(O)overset(||)C-underset(CH_(3))underset(|)CH-CH_(3)toCH_(3)-underset(CH_(3))underset(|)CH-NH-CH_(2)-underset(CH_(3))underset(|)CH-CH_(3)`
Discussion
15204.

This section contains Reasoning Type Questions. Each question contains STATEMENT-1 (Assertion) and STATEMENT-2 (Reason). Each question has 4. choices (A), (B), (C) and (D) out of which ONLY ONE is correctQSTATEMENT-1: The geometrical isomers of the complex [M(NH_(3)_(4)Cl_(2)]are opticallyinactive and STATEMENT-2: Both geometrical isomers of the complex [M(NH_(3))_(4)Cl_(2)] possess axis of symmetry. (A) STATEMENT-1 is True, STATEMENT-2 is True, STATEMENT-2 is correct explanation for STATEMENT:1 (B) STATEMENT-1 is True, STATEMENT-2 is True, STATEMENT-2 is NOT a. correct explanation for STATEMENT-1 (C) STATEMENT-1 is True, STATEMENT-2 is False (D) STATEMENT-1 is False, STATEMENT-2 is True

Answer»


Solution :The MOLECULE should not posses alternate axis of SYMMETRY to be optically ACTIVE
Discussion
15205.

Which one of the following noble gases is the least polarizable

Answer»

Xe
AR
NE
He

Solution :He is least polarizable because of SMALL ATOMIC SIZE.
Discussion
15206.

Thioalcohols are prepared by treating alkyl halides with :

Answer»

`KSH`
`C_(2)H_(5)Sna`
`H_(2)S`
`AGCNS`

Answer :A
Discussion
15207.

The solid PCl_5exists as ........

Answer»

`PCl_3`
`PCl_(4)^(+)`
`PCl_6^(-)`
`PCl_4^(+) and PCl_(6)^(-)`

SOLUTION :Sollid `PCl_5`EXISTS as `[PCl_(4)]^(+)[PCl_(6)]^(-)`
Discussion
15208.

What is the use of CuSO_4 in kjeledahl's method ?

Answer»

Hydrolysing AGENT
REDUCING agent
Oxidising agent
CATALYTIC agent

Answer :D
Discussion
15209.

White light consists of seven colours (VIBGYOR). If orange light is absorbed by a substance. What will be the colour of the substance and if blue is absorbed, what will be the colour and why ?

Answer»

SOLUTION :If orange is absorbed, the SUBSTANCE will LOOK blue and if blue is absorbed, the substance will look orange. This is because orange and blue are complementary COLOURS.
Discussion
15210.

Which is most basic?Benzylamine,aniline,Acetanilide,p-Nitroaniline.

Answer»

Benzylamine
aniline
Acetanilide
p-Nitroaniline

Answer :A
Discussion
15211.

Which of the following is the most stable areonium or benzenium ion?

Answer»




Solution :In (B) positive CHARGE is more stablised due to `+I` effect of `(Me)` GROUP.
Discussion
15212.

Which is the most SO_2 polluted city

Answer»

Bombay
Calcutta
Delhi
Madras

Answer :B
Discussion
15213.

Vapour pressure of a solution containing non-volatie solute is:

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More than the VAPOUR PRESSURE of a solvent
Less than the vapour pressure of solvent
Equal to the VAPUR pressure of solvent
None

Answer :B
Discussion
15214.

Which of the following molecule is planar?

Answer»

`CH_4`
`C_2H_4`
`NH_3`
`SiCl_4`

ANSWER :B
Discussion
15215.

Theunpleasantsmellingisocyanide isocyanideare also

Answer»

NITRILES
CYANIDE
CARBYL AMINE
ethers

Answer :C
Discussion
15216.

To which block is related an element having electronic configuration 1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(10)4s^(1) in the periodic table

Answer»

s-block
p-block
d-block
f-block

Solution :As LAST `E^(-)`GOES to d-subshell.
Discussion
15217.

The unit of ebullioscopic constant is _

Answer»

`K KG "MOL"^(-1) " or " K ("MOLALITY")^(-1)`
Mol `kg K^(-1) " or" K^(-1) ` (molality)
`kg "mol"^(-1)K^(-1) "or" K^(-1) ("molality")^(-1)`
K mol `kg^(-1)` orK (molality)

Solution :`K kg "mol"^(-1) " or " K ("molality")^(-1)`
Discussion
15218.

Which stoichiometric defect increases the density of a solid ?

Answer»

Solution :INTERSTITIAL defect increase the DENSITY of a SOLID.
Discussion
15219.

Which of the following undergoes hydrolysis ?

Answer»

`CH_(3)COOK`
`HNO_(3)`
`Na_(2)SO_(4)`
`K_(2)SO_(4)`

Answer :A
Discussion
15220.

Which of the following alcohols gives the best yield of dialkyl ether on being heated with a trace of sulpuric acid

Answer»

2-pentanol
Cyclopentanol
2-methyl-2-butanol
1-pentanol

Solution :1-Pentanol
PRIMARY ALCOHOLS READILY form ether when heated with CONC. `H_(2)SO_(4)`.
Discussion
15221.

Whichof the followingreacts with Hinsberg reagentto froma product soluble in KOH.

Answer»

`1^(@)` AMINE
`2^(@)` - amine
`3^(@)` - amine
quaternaryamine

Answer :A
Discussion
15222.

What is copolymerization? Give example.

Answer»

Solution :It is a type of POLYMERISATION in which more than ONE type of monomers species are allowed to polymerise and to FORM a COPOLYMER. EX, Buna-N, Bakelite, Buna-S, Nylon-6,6.
Discussion
15223.

Which is less reactive?

Answer»

Fe
Ni
Pt
Co

Answer :C
Discussion
15224.

Which of the following species is/are isoelectronic to each other ? (I) overset(Θ)(B)H_(3) - C -= N (II) CH_(3) - C -= CH (III) N_(2)O

Answer»

I and II only
II and III only
I, II and III only
All four

Solution :ISOELECTRONIC means having same NUMBER of electrons in all the OPTIONS total number of electrons are 22
Discussion
15225.

Which one of the following is not an additional polymer?

Answer»

POLY ethylene
PVC
Nylon 6,6
teflon

Solution :PVC
Discussion
15226.

Which group of elements lose electrons more readily ?

Answer»

<P>Li, NA, K
`F_2, Cl_2, Br_2`
N, P, As
O, S, Sc

Answer :A
Discussion
15227.

Which one of the following is a second order reaction?

Answer»

`H_(2) + Br_(2) rightarrow 2HBR`<BR>`NH_(4)NO_(3) rightarrow N_(2) + 3H_(2)O`
`H_(2) + CI_(2) overset"(sunlight)"to 2HCI`
`CH_(3)COOCH_(3) + NaOH rightarrow CH_(3)COONA+H_(2)O`

Solution :`H_(2) + Br_(2) rightarrow 2HBr`
`H_(2) _CI_(2) rightarrow 2HCI`
These are photochemical reactions, Order = zero.Decomposition of ammonium nitrate in a AQUEOUS solution is a first oreder reaction.
`NH_(4)NO_(3) rightarrow N_(2) + 3 H_(2)O`
Hydrolysis of ester by an alkali (saponification) is a second order reaction.
`CH_(3)COOCH_(3) + NaOH rightarrow CH_(3)COONa + CH_(3)OH`.
Discussion
15228.

Which of the following compounds will not show geometrical isomerism :

Answer»

Azomethane
1-Bromo-2-chloroethene
1-Phenylpropene
2-Methyl-2-butene

Answer :D
Discussion
15229.

Which of the followingis not a polyamide fibre

Answer»

NYLON -66
Nylon-6
SILK
Terylene

SOLUTION :Terylene is POLYESTER.
(a),(b),(C) are polyamide fibres. Silk is natural polyamide fibre.
Discussion
15230.

Which one of the following compounds has the smallest bond anglein its molecule ?

Answer»

`OH_(2)`
`H_(2)S `
`NH_(3) `
`SO_(2)`

Solution :Bond angles are `OH_(2)(104^(@)),H_2S(92^(@)),NH_(3)(107^(@)) and SO_(2)(119.5^(@))`. Hence , `H_2S` has smallestbondangle among the given COMPOUND .
Discussion
15231.

When NH_(3) reacts with excess of F_(2), the products formed are

Answer»

`HF + NF_(3)`
`N_(2) + HF`
`HF+ N_(2) + NF_(3)`
`HF _ NF_(3)+ H_(2) O`

Answer :A
Discussion
15232.

Which of following is diamagnetic ?

Answer»

`[RhCl(CO)(P Ph_(3))(NH_(3))]`
`[RhF_(6)]^(-3)`
`[Ir(H_(2)O)_(6)]F_(2)`
`[MoCl_(6)]^(-3)`

Answer :A
Discussion
15233.

Which of the following acids on heating loses a molecul of H_(2)O to form an alpha,beta-unsaturated acid?

Answer»

`CH_(3)CHOHCOOH`
`HOCH_(2)COOH`
`CH_(3)CHOHCH_(2)COOH`
`HOCH_(2)CH_(2)CH_(2)COOH`

Solution :`beta`-HYDROXY acids on heating lose a molecule of `H_(2)O` to FORM `alpha,beta`-unsaturated acids, i.e., option (c) is correct.
`CH_(3)overset(beta)(C)HOHoverset(alpha)(C)H_(2)COOH overset(heat)to CH_(3)CH=CHCOOH+H_(2)O`
Discussion
15234.

Which of the following is present in maximum amount in acid rain ?

Answer»

`HNO_(3)`
`H_(2)SO_(4)`
HCL
`H_(2)CO_(3)`

Answer :B
Discussion
15235.

Which of the following can adsorb larger volume of hydrogen gas?

Answer»

Finely divided NICKEL
Colloidal SOLUTION of palladium
Finely divided platinum
Colloidal`Fe(OH)_(3)`

Solution :Colloidal solution of palladium has MAXIMUM surface area.
Discussion
15236.

Which of the following is called vitamin H ?

Answer»

BIOTIN
FOLIC ACID
Thiamin
Niacin

Answer :A
Discussion
15237.

When standard half-cell reduction potential of hydrogen would be negative ?

Answer»

`p(H_(2))=2` ATMOSPHERE and `[H^(+)]=1.0M`
`p(H_(2))=2` atmosphere and `[H^(+)]=2.0M`
`p(H_(2))=1` atmosphere and `[H^(+)]=2.0M`
`p(H_(2))=1` atmosphere and `[H^(+)]=1.0M`

Solution :`Pt|H_(2(g))|H_((aq))^(+)`
`H^(+)+e^(-) to (1)/(2)H_(2(g))("REDUCTION")`
`E=E^(@)-(0.059)/(1)"LOG"([P_(H_(2))]^((1)/(2)))/([H^(+)])`
`E=E^(@)-(0.059)/(1)"log"((2)^((1)/(2)))/(1)=-ve`
Discussion
15238.

What is the other name of Halic(VII) acid ?

Answer»

Halic ACID 
HYPO Halous acid 
Halous acid 
PER Halic acid 

ANSWER :C
Discussion
15239.

Which would be obtained by boiling CHCl_3 with caustic soda :

Answer»

`CH_3COONa`
HCOONA
`Na_2C_2O_4`
`CH_3OH`

ANSWER :B
Discussion
15240.

Which one is an elimination reaction ?

Answer»

`CH_3CH_3 + Cl_2 rarr CH_3CH_2Cl + HCl`
`CH_3Cl + KOH(AQ) rarr CH_3OH + KCL`
`CH_2=CH_2+Br_2rarr CH_2BrCH_2Br`
`C_2H_5Br + KOH(ALC.) rarr C_2H_4 + KBR + H_2O`

Answer :D
Discussion
15241.

What is the effect of i) Electron with drawing group on acidity of phenols. ii) Electron donating group on acidity of alcohols. iii) Boiling point of alcohols on increasing number of carbon atoms.

Answer»

Solution :i) Electron with drawing GROUP increase the acidity of PHENOLS.
ii) Electron donating group decreases acidity of alcohols.
III) BOILING point of alcohols increases on increasing number of carbon atoms.
Discussion
15242.

Two glass bulbs A and B are connected by a very small tube having a stop cock. Bulb A has a volume of 100 ml and contained the gas while bulb B was empty. On opening the stop cock, the pressure fell down to 40%. The volume of the bulb B must be

Answer»

40 ML
60 ml
150ml
260 ml

ANSWER :C
Discussion
15243.

When SnCl_2 reacts with HgCl_2,the product formed are :

Answer»

`Sn+HgCl_4`
`Sn+Cl_2+Hg_2Cl_2`
`SnCl_4` and `Hg_2`
NONE of these

Answer :C
Discussion
15244.

Which one of the following sets forms the biodegradable polymer ?

Answer»



`CH_2=CH-CN & CH_2=CH-CH=CH_2`
`H_2N-CH_2-COOH & H_2N-(CH_2)_5-COOH`

SOLUTION :Nylon-2-Nylon-6 is a BIODEGRADABLE POLYMER
Discussion
15245.

Which of the following is weakest acid ?

Answer»




ANSWER :A
Discussion
15246.

Which of the following compound will forms 2 isomeric oximes on reacting with NH_(2)OH ?

Answer»

RCHO
RCOR
HCHO
PhCOPh

Solution :In ketoximes, PREFIXES syn and anti are related to the POSITION of the first GROUP NAMED with respect to the -OH group whether lying on the same side or opposite side of the double bond.
Discussion
15247.

Which of the following statements are correct ? (i)Arsenic and antimony are metalloids. (ii) Phosphorus, arsenic and antimony are found (iii) covalent radii increases equally from N to Bi. (iv) Elements of group 15 have extra stability and higher ionisation energy due to exactly half filled ns^(2)np^(3) electronic configuration. (v) In group 15 elements only nitrogen is gas whereas all others are solids.

Answer»

i.iv and v
ii, iii and iv
I, ii and iii
ii, iii and v

Solution :PHOSPHORUS occurs in minerals of the apatite family, `Ca_(9)(PO_(4))_(6), CaX_(2)(X=F, Cl or OH)` which are MAIN components of phosphate rocks whereas arsenic and antimony are found as sulphide minerals. The INCREASE in covalent radii from N to P is greater in comparision to increase from As to Bi.
Discussion
15248.

The strongest reducing agent among the following is :

Answer»

Ozone
Oxygen
Fluorine
Chlorine

Answer :C
Discussion
15249.

Whichof the followingstatementis not trueabout(CH_(3))_(3)N?

Answer»

It'sIUPACnameis trimethanamine
N-atom is `SP^(3)` - hydridisedstate
it haspyramidal STRUCTURE
It containimino GROUP

ANSWER :D
Discussion
15250.

Using the data given below find out the strongest reducing agent. E_(Cr_(2)O_(7)^(2-)//Cr^(3+))^(@) = 1.33 V, E_(Cl_(2)//Cl^(-))^(@) = 1.36 V E_(MnO_(4)^(-)//Mn^(2+))^(@) = 1.51 V, E_(Cr^(3+)//Cr)^(@) = -0.74 V

Answer»

`Cl^(-)`
Cr
`Cr^(3+)`
`Mn^(2+)`

ANSWER :B
Discussion