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5101.

Which of the following species show(s) synergi bonding ?

Answer»

`[Mo(CO)_(6)]`
`[MN(CO)_(6)]^(-)`
`[Ni(CN)_(4)]^(-4)`
All of the above SPECIES have SYNERGIC bonding

Answer :D
Discussion
5102.

What type of metals are generally extracted by electrolytic method?

Answer»

SOLUTION :More reactive METALS having LARGE negative ELECTRODE potential.
Discussion
5103.

Two reaction A toproducts and B toproducts have rate constant k_(a) and k_(b) at temperature T and activation energies E_(a) and E_(b) respectively. If k_(a) gt k_(b) and E_(a) lt E_(b) and assuming that a for both the reactions is same then :

Answer»

At higher temperature `k_(a)` will be greater than `k_(B)`
at LOWER temperature `k_(a)` and `k_(b)` will differe more and `k_(a) gt k_(b)`
as temperature rises `k_(a)` and `k_(b)` will be close to each other in magnitude
all of the above

Answer :C
Discussion
5104.

Which of the following molecules acts as a Lewis acid

Answer»

`(CH_(3))_(3)B`
`(CH_(3))_(2)O`
`(CH_(3))_(3)P`
`(CH_(3))_(3)N`

SOLUTION :`(CH_(3))_(3)B` - is ELECTRON deficient.
Discussion
5105.

While filling up of the electrons in the atomic orbitals, the 4s orbital is filled before the 3d orbital but reverse happens during the ionisation of the atom. Explain why ?

Answer»

Solution :Filling of electrons is explained by `(N + 1)` rule. Electrons will go to that level where the value of `(n + 1)` is MINIMUM.
For 3d orbital `n + l = 3 + 2 = 5`
For 4s orbital `n+l=4+0=4`
So the electrons will be filled first in 4s orbital and then in 3d orbital.
When it comes to ionisation of the atom, we need to compare the ionisation enthalpy. Removal of ELECTRON from 4s requires LESS energy than removal of electron from 3d orbital.
Discussion
5106.

Which of the following ions is paramagnetic ? Sc^(3+)(Z=21),Cu^(+)(Z=29)

Answer»

Solution :NEITHER contains unpaired ELECTRONS. THEREFORE, neither of them is PARAMAGNETIC.
Discussion
5107.

Which of the following shows bonds in silicones ?

Answer»

Si-Si -Si-Si
Si-C-Si-o-Si
Si-C-Si-C-Si
`-Si-O-Si-O-Si`

SOLUTION :SILICONES CONTAIN -Si-O-Si-O-Si- BACK BONE.
Discussion
5108.

Which of the following statement(s) is/are correct

Answer»

Reversible isothermal compression of an ideal gas represents the LIMITING minimum value of the workdone (|w|) by the surrounding on the system.
In an irreversible process, the cyclic integral of work is not zero.
For thermodynamic CHANGES in adiabatic process `""_(T)((C_(P.m))/R).` P = constant
Work done by 1 mole of a real (VANDER waals) gas `W=-RTl n(V_(2)-b)/(V_(1)-b)-a[(V_(1)xxV_(2))/(V_(2)-V_(1))]`

Answer :B
Discussion
5109.

What is sequence of reagent use to convert following

Answer»

`(H_2)/(PD)`,`[AG(NH_3)_2]^(+)`,`(Br_2)/(NAOH)`
`Ag[(NH_3)_2]^(+)`,`(H_2)/(Pd),(Br_2)/(NaOH)`
`(Br_2)/(NaOH)`,`[Ag(NH_3)_2]^(+),(H_2)/(Pd)`
`(H_2)/(Pd),(Br_2)/(NaOH),[Ag(NH_3)_2]^(+)`

SOLUTION :
Discussion
5110.

Which one of the following is not a pnictogens?

Answer»

Nitrogen
OXYGEN
Phosphorous
Antimony

Solution :Oxygen
Discussion
5111.

Which of the following change is correct

Answer»



Both (a) and (b) ONE correct
Neither (a) nor (b)

Solution :Both (a) and (b) are correct. We `CH_(3)CO OH` GIVES cis addition and dry `CH_(3)CO OH` gives trans addition products.
Discussion
5112.

Thyroxine is iodinated derivative of which amino acid ?

Answer»

Tyrosine
Cysteine
Glutamine
Tryptophan

Answer :A
Discussion
5113.

Which one of the following is a polysaccharide ?

Answer»

CANE sugar
Starch
Glucose
Maltose

Answer :B
Discussion
5114.

The statements regarding hydrides of VIA group elements are (i) the order of volatility H_2O < H_2Te < H_2Se < H_2S (ii) The order of B.P H_2O > H_2Te > H_2Se >H_2S (iii) The order of bond angles H_2O > H_2S > H_2Se > H_2Te The correct combination is

Answer»

All are CORRECT
Only i is correct
ii and III are correct
i & iii are correct

Answer :A
Discussion
5115.

Which is used for ending charge on colloidal solutions

Answer»

ELECTRONS
Electrolysis
Positive CHARGED ions
Compounds

Answer :B
Discussion
5116.

Which of the following is a chlorinated insecticide?

Answer»

DDT
METHOXY chloro
Pavathion
B.H.C

Solution :pavathion DONOT contain chlorine
Discussion
5117.

When one mole of monoatomic ideal gas at T K undergoes adiabatic change under a constant external pressure of 1 atm changes volume from 1 litre to 2 litre. The final temperature in Kelvin would be

Answer»

`(T)/(2^((2//3)))`
`T+(2)/(3xx0.0821)`
T
`T-(2)/(3xx0.0821)`

ANSWER :D
Discussion
5118.

Which of the following statements are false for a solution of chloroform and acetone?

Answer»

The solution formed is an ideal solution
The solution formed is a non-ideal solution with positive deviation from Raoult's law
The solution formed is a non-ideal solution with negative deviation from Raoult's law.
The solution behaves ideally or non-ideally depending upon its composition.

Solution :(a,b,d) When `CHCl_3` and `(CH_3)_(2)CO` are mixed, the HYDROGEN BONDING takes places between the two molecular species due to which the escaping TENDENSY of EITHER of the liquid molecules become less. Consequently, the boiling point of solution increases.
Discussion
5119.

When a primary amine reacts with CHCl_(3) in the presence of ethanolic KOH, then the product is :

Answer»

an ISOCYANIDE
an ALDEHYDE
a CYANIDE
an alcohol

Solution :An isocyanide is FORMED
Discussion
5120.

The Vant Hoff's factor 'i' accounts for

Answer»

EXTENT of SOLUBILITY of solute
extent of MOBILITY of solute
extent of DISSOLUTION of solute
extent of DISSOCIATION of solute

Answer :D
Discussion
5121.

Which of the following is least basic?

Answer»

`C_(6)H_(5)NH_(2)`
`C_(2)H_(5)NH_(2)`
`(C_(2)H_(5))_(2)NH`
`(C_(2)H_(5))_(3)N`

Answer :A
Discussion
5122.

The shape of ethylene molecule is:

Answer»

Tetrahedral
Pyramidal
Planar
Linear

Answer :B
Discussion
5123.

Which show maximum valency

Answer»

Phosphorus
Tin
ANTIMONY
BISMUTH

Solution :Phosphorus SHOW +5 VALENCE
Discussion
5124.

Which of the order for ionisation energy is correct

Answer»

`BegtBgtCgtNgtO`
`BltBeltCltOltN`
`BltBeltCltNltO`
`BltBeltNltCltO`

SOLUTION :Ionisation energy increases ACROSS the period but DUE to stable half FILLED configuration of VA group, its I.E. is more than VI-A group.
Discussion
5125.

The stability of complex ion depend upon charge, size electronegativity of metal ion. Greater the charge of metal ion greater would be the stability. As size of metal ion decreases stability of metal ion increases complex ion more stable if chelating ligand present. Fe^(+3)+6CN^(-)hArr[Fe(CN)_(6)]^(-3),K_(1) Fe^(+2)+6CN^(-)hArr[Fe(CN)_(6)]^(-4),K_(2) : the value of K_(1) and K_(2) are

Answer»

`1.8xx10^(6),1.2xx10^(31)`
`1.8xx10^(6),1.8xx10^(6)`
`1.2xx10^(31),1.2xx10^(31)`
`1.2xx10^(31),1.8xx10^(6)`

Solution :STABILITY of complex ion, `alpha` CHARGE of metal ion `alpha=(1)/("size of metal ion")`
Hence, ORDER of stability `[Fe..(CN)_(6)]^(4-)LT[Fe..(CN)_(6)]^(3-)impliesK_(2)ltK_(1)`
Discussion
5126.

Which of the following isomers is more volatile ? o - nitrophenol or p - nitrophenol

Answer»

Solution :o - nitrophenol is more VOLATILE because of intramolecular HYDROGEN BONDING.
Discussion
5127.

The stability of complex ion depend upon charge, size electronegativity of metal ion. Greater the charge of metal ion greater would be the stability. As size of metal ion decreases stability of metal ion increases complex ion more stable if chelating ligand present. Which is most correct order of stability

Answer»

`Zn^(+2)gtCu^(+2)gtNi^(+2)gtCo^(+2)gtFe^(+2)gtMn^(+2)`
`Zn^(+2)ltCu^(+2)ltNi^(+2)ltCo^(+2)ltFe^(+2)ltMn^(+2)`
`Zn^(+2)=Cu^(+2)gtNi^(+2)gtCo^(+2)gtFe^(+2)gtMn^(+2)`
`Zn^(+2)gtCu^(+2)gtNi^(+2)=Co^(+2)gtFe^(+2)gtMn^(+2)`

Solution :STABILITY of complex `ALPHA` CHARGE density, small cations with HIGH charge density will form STABLE complexes.
Discussion
5128.

The stability of complex ion depend upon charge, size electronegativity of metal ion. Greater the charge of metal ion greater would be the stability. As size of metal ion decreases stability of metal ion increases complex ion more stable if chelating ligand present. Which increases stability of complex ion

Answer»

greater charge on metal ion
less size of metal ion
chelating ligand
all the above

Solution :STABILITY of a COMPLEX , `alpha` Charge of metal ion `alpha(1)/("size of ion"),alpha` extent of CHELATION.
Discussion
5129.

Which halogen has atomicity greater than 2 ?

Answer»

`Br_2`
`Cl_2`
`I_2`
NONE of these

SOLUTION :All have ATOMICITY 2.
Discussion
5130.

Which type of hybridisation take place in [Fe(CO)_(5)] ?

Answer»

`dsp^(2)`
`d^(2)sp^(3)`
`sp^(3)d^(2)`
`dsp^(3)`

ANSWER :C::D
Discussion
5131.

Write the balanced chemical equations for the following: i. Sodium bromate reacts with flurine in the presence of an alkalil. ii. Sodium chlorate chlorate rects with sulphur dioxide in dilute sulphuric acid medium.

Answer»

Solution :i.`BrO_(3)^(THETA)+F_(2)+2OH^(Theta)RARR BrO_(4)^(Theta)+2F^(Theta)+H_(2)O`
ii.`2CIO_(3)^(Theta)+SO_(2)overset(Acid)rarr 2CIO_(2(G))+SO_((4aq))^(2-)`
Discussion
5132.

Which cycloalkane has the lowest heat of combustion per CH_(2) group ?

Answer»

CYCLOPROPANE
cyclobutane
cyclopentane
cyclohecane

Solution :In cyclopropane, the angle strain is maximum, hence it is a highly strained molecule and consequently most unstable. The angle strain in cyclobutane is less than that in cyclopropane, hence cyclobutane is more stable than cyclopropane. This stability INCREASES upto 6 membered rings, then decreases from 7 to 11 membered rings and from the 12 membered ONWARDS attains the stability of 6 membered ring. Heat of combustion is a method of measuring chemical stability. Hence CYCLOHEXANE has the lowest heat of combustion per `- CH_(2)` group.
Discussion
5133.

Which of the following electrolytes will have maximum coagulating value for Ag/Ag^(+) sol?

Answer»

`Na_(2)S`
`Na_(3)PO_(4)`
`Na_(2)SO_(4)`
`NaCl`

Solution :As per Hardy-Schulze rule, `Cl^(-)` will have minimum coagulating power due to lower charge on it.
THUS, it has maximum coagulating VALUE.
Discussion
5134.

Which one of the following is formed as a product when ethanal is treated with 2 equivalent of methanol?

Answer»

1,1 - dimethoxy methane
1,2 - dimethoxy ETHANE
1,1 - dimethoxy ethane
1,1 - diethoxy ethane

Solution :1,1 - dimethoxy ethane
Discussion
5135.

Which of the following is more acidic alcohol?

Answer»

`C_2H_5OH`
`CH_3-undersetunderset(OH)|CH-CH_3`
`CH_3-CH_2-CH_2-OH`
`(CH_3)_3-OH`

ANSWER :A
Discussion
5136.

Which of the two is more stable and why ? K_(4)[Fe(CN)_(6)] or K_(3)[Fe(CN)_(6)]

Answer»

Solution :The STABILITY of a coordination COMPOUND depends UPON the charge on the central atom.
GREATER the charge on the central atom, greater is the stability.
In `K_(3)[Fe(CN)_(6)]`, the charge on Fe is +3, while in `K_(4)[Fe(CN)_(6)]`, the charge is +2. Therefore, `K_(3)[Fe(CN)_(6)]` is more stable.
Discussion
5137.

Which shows the least chemical reactivity:

Answer»

Ammonia
Methane
Argon
Hydrogen Sulphide

Answer :C
Discussion
5138.

Which of the following electrolytes will be most effective in the coagulation of gold sol ?

Answer»

`NaNO_(3)`
`K_(4)[Fe(CN)_(6)]`
`Na_(3)PO_(4)`
`NgCl_(2).`

Solution :Gold SOL is negatively charged. Hence, most effective for COAGULATION will be `Mg^(2+)` ions.
Discussion
5139.

When phenol is treated with excess brominewater, it gives

Answer»

m-bromophenol
o and p-bromophenols
2, 4-dibromophenol
2, 4, 6-tribromophenol

Answer :D
Discussion
5140.

Unitof rateof reactionis

Answer»

`moldm^(-3)TIME^(-1)`
`MOL^(-1) dm^(3)time ^(-1)`
`mol dm ^(-3)`time
`mol^(-1)dm^(-1) time^(-1)`

Answer :A
Discussion
5141.

When potassium dichromate crystals are heated with concentrated sulphuric acid, we get :

Answer»

Oxygen
Hydrogen
SULPHUR dioxide
Hydrogen sulphide.

SOLUTION :`2K_(2)Cr_(2)O_(7) + 8H_(2)SO_(4) to 2K_(2)SO_(4) + 2Cr_(2)(SO_(4))_(3) + 8H_(2)O + 3O_(2)`
Discussion
5142.

What type of forces bind the substrate to the active site of enzyme ? (i) Ionic bonding (ii) Hydrogen bonding(iii) van der Waals forces(iv) Reaction with functional group of enzymes

Answer»

(i),(ii) and (IV)
(i),(III) and (iv)
(i),(ii) and (iii)
(i),(ii),(iii) and (iv)

SOLUTION :Substrates bind to the active site of the enzyme through ionic bonding , hydrogen bonding, van der Waals INTERACTION or dipole-dipole interaction.
Discussion
5143.

Which radicals are precipitated in (NH_(4))_(2)CO_(3) in presence of alkali

Answer»

`Ca,BA,Sr`
`Mg`
Both
None of these

Solution :Ca, Ba, Sr these radicals are PRECIPITATED in BASIC MEDIUM.
Discussion
5144.

When neopentyl bromide is subjected to Wurtz reaction, the product formed is

Answer»

2,2,4,4-tetramethy lhexane
2,2,4,4-tetramethy lpentane
2,2,5,5-tetrametllylhexane
2,2,3,3-tetrametllylhexane

SOLUTION :
Discussion
5145.

What is Hinsberg's reagent ?

Answer»

SOLUTION :BENZENE SULPHONYL CHLORIDE
Discussion
5146.

Which reaction is not feasible ________

Answer»

`2H_(2)O+2F_(2) RARR 4HF+O_(2)`
`2KBr+I_(2)rarr 2KI+Br_(2)`
`2KBr+Cl_(2) rarr 2KCl+Br_(2)`
`2KI+Br_(2)rarr 2KBr+I_(2)`

ANSWER :A::B
Discussion
5147.

Which of the following protein destroy the antigen when it enters in body cell?

Answer»

Antibodies
Insulin
Chromoprotein
Phosphoprotein

Solution :When antigens enter in to the BODY CELLS and destroy them, then antibodies being proteins are synthesised in the body and combine with antigens and destroy these antigens by FORMING inactive complexes. THEREFORE antibodies protein destroy antigens.
Discussion
5148.

When salicycilc acid is distilled with zinc dust, the product obtained is

Answer»

phenol
benzoic acid
zinc salicylate
salicylaldehyde

Solution :
Discussion
5149.

Uranium ._(92)U^(238) decayed to ._(82)Pb^(206). They decay process is ._(92)U^(238) underset((x alpha, y beta))(rarr ._(82)Pb^(206)) t_(1//2) of U^(238)= 4.5 xx 10^(9) years A sample of rock south America contains equal number of atoms of U^(238) and Pb^(206). The age of rock will be

Answer»

`4.5 xx 10^(9)` years
`9 xx 10^(9)` years
`13.5 xx 10^(9)` years
`2.25 xx 10^(9)` years

Solution :`K = (2.303)/(t) "log" ((N_(0))/(N))`
`(0.693)/(t_(1//2)) = (2.303)/(t) "log" ((N_(0))/(N))``[{:(N_(0) = 1 + 1 = 2),(N = 1):}]`
`(0.693)/(4.5 xx 10^(9)) = (2.303)/(t) "log" ((2)/(1))`
`:.t = 4.5 xx 10^(9)` years
Discussion
5150.

Which one is disinfectants ?

Answer»

`0.2-0.4` PPM concentrated aqueous SOLUTION of CHLORINE. 
Low concentration of `SO_(2)` 
Boric ACID 
(A) and (B) both 

Solution :(A) and (B) both
Discussion