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18251.

What is the mainreasonforanilinewhichforaniline whichdoesnot give Feridel Craftreaction

Answer»

Aniline isstabilizedbyresonance
`NH_(2)`groupof anilinereact with `AlCl_(3)`to GIVE ringdeactivating`overset(Ɵ)NH_(2)Cl`
lonepairof electrononnitrogenneverconjugatwith BEZENE RING
itis a Lewis base

Answer :B
Discussion
18252.

What is the action of Zn-Hg in conc. HCl on acetaldehyde?

Answer»

SOLUTION :Acetaldehyde on reduction with Zn-Hg in CONCENTRATEDHCL FORMS ethane.
Discussion
18253.

Write the structures of the following organic halogen compounds.2-(2-Chlorophenyl)-1-iodooctane

Answer»

SOLUTION :
Discussion
18254.

Which one of the following is an example for homogeneous catalysis ?

Answer»

Manufacture of sulphuric ACID by CONTACT process
Manufacture of ammonia by Haber's process
Hydrolysis of sucrose in presence of DILUTE hydrochloric acid
Hydrogenation of OIL

Solution :Hydrolysis of sucrose in presence of dil `HCl` is an example of homogeneous cataysis.
`underset("Sucrose")(C_(12)H_(22)O_(11(l)))+H_(2)O_((l))overset("dil. "HCl_((l)))(to)underset("Glucose")(C_(6)H_(12)O_(6(l)))+underset("Fructose")(C_(6)H_(12)O_(6(l)))`
Both the reactants and catalyst are in the same phase.
Discussion
18255.

Which of the following proteins are sensitive to the change in pH ?

Answer»

KERATIN
ALBUMIN
Myosin
Fibroin

SOLUTION :Albumin
Discussion
18256.

When H_(2)O_(2) is added to an acidified solution of K_(2)Cr_(2)O_(7):

Answer»

Solution turns green due to FORMATION of `Cr_(2)O_(3)`
Solution turns yellow due to formation of `K_(2)CrO_(4)`
Solution gives green ppt of `Cr(OH)_(3)`

Solution :`Cr_(2)O_(7)^(2-)+2H^(+)+4H_(2)O_(2) to 2CrO(O_(2))_(2)("blue coloured")+5H_(2)O`.
Discussion
18257.

Which one of the following ions has the highest value of ionic radius?

Answer»

`O^(2-)`
`B^(3+)`
`LI^(+)`
`F^(-)`

Solution :`O^(2-)` has the highest value of ionic radii as this can be explained on the basis of`Z//e{("Nucleus charge")/("No. of ELECTRON")}`
Whereas `Z//e` ratio INCREASES, the size decreases and when `Z//e` ratio decreases the size increases.
Discussion
18258.

What are (i) antagonists (ii) agonists.

Answer»

Solution : (i) The drugs which binds to the receptor site and INHIBIT its NATURAL function are called ANTAGONISTS.
(ii) There are drugs which MIMIC the natural messenger by SWITCHING on the receptor. Those type of drugs are called agonists.
Discussion
18259.

Which does not belong to first transition series?

Answer»

Fe
V
Ag
Cu

Answer :C
Discussion
18260.

Which of the following statements are correct for benzoic acid?

Answer»

Nitration GIVES o-and p-nitrobenzoic acid.
The Fridel-Crafts REACTION with `CH_(3)COCl//AlCl_(3)` gives m-caroxyacetophenone.
The reaction with CONCENTRATED sulphuric acid gives 3-carboxybenzenesulphonic acid.

Answer :B::D
Discussion
18261.

Write the structures of the following organic halogen compounds.1-Bromo-4-sec-butyl-2-methylbenzene

Answer»

SOLUTION :
Discussion
18262.

What do you mean by zero order of a reaction?

Answer»

Solution :The reaction with ORDER is a zero order reaction :rate,`R=k[R]^0`,rate does not DEPEND on contration .
Discussion
18263.

The standard enthalpies of formation of CO_(2)(g), H_(2)O(l) and glucose(s) at 25^(@)C are -400kJ//mol, -300 kJ//mol and -1300 kJ//mol, respectively. The standard enthalpy of combustion per gram of glucose at 25^(@)C is

Answer»

`+2900 kJ`
`-2900 kJ`
`-16.11 kJ`
`+16.11 kJ`

Solution :`C_(6)H_(12)O_(6)(s)+6O_(2)(G)rarr6CO_(2)(g)+6H_(2)O(l)`
`Delta_(c)H=6xxDelta_(f)H(CO_(2))+6Delta_(f)H(H_(2)O)-Delta_(f)H(C_(6)H_(12)O_(6))`
`-6Delta_(f)H(O_(2), g)`
`=6xx(-400-300)-(-1300)-0`
=-4200+1300
=-2900kJ/mol
For one gram of glucose, ENTHALPY of combustion
`=-(2900)/(180)=-16.11 kJ//g`.
Discussion
18264.

The velocity of alpha-rays is approximately

Answer»

EQUAL to that of the velocity of light
1/10 of the velocity of light
10 times more than the velocity of light
Uncomparable to the velocity of light

Solution :`alpha`-RAYS travel with a velocity which is `(1)/(10)th " to " (1)/(20) th` of that of light
Discussion
18265.

Which of the following molecule does not have dipole moment greater than zero ?

Answer»

`NH_3`
`CHCl_3`
`H_2O`
`C Cl_4`

ANSWER :D
Discussion
18266.

Which fo the following is not correct?

Answer»

Ovalbumin is a simple FOOD reserve in egg-white
Blood PROTEINS thrombin and FIBRINOGEN are involved in blood clotting
Denaturation makes the proteins more active
Insulin maintains sugar level in the blood of a human body

Solution :Due to denaturation, the native SHAPE of the protein is destryoed and BIOLOGICAL activity is lost
Discussion
18267.

Which salt shows maximum osmotic pressure in its 1 M solution ?

Answer»

`AgNO_3`
`Na_2SO_4`
`(NH_4)_3PO_4`
`MgCl_2`

ANSWER :C
Discussion
18268.

What is meant by the term absorption.

Answer»

Solution :Absorption is the PHENOMENON of UNIFORM distribution of a SUBSTANCE into the body of ANOTHER substance.
Discussion
18269.

Which statement is incorrect about osmotic pressure (P), volume (V) and temperature (T) ?

Answer»

P `prop` (1)/(V) if T is constant
P `prop` T, if V is constant
P `prop ` V ,if T is constant
PV is constant, if T is constant

Answer :C
Discussion
18270.

What is the other name for freezing point depression constant or molal depression constant ?

Answer»

SOLUTION :CRYOSCOPIC CONSTANT
Discussion
18271.

What is adsorption isobar ?

Answer»

Solution :ADSORPTION ISOBAR . The GRAPH between the amount of substance adsorbed at different temperatures under a constant gas pressure is CALLED adsorption isobar .
Discussion
18272.

Which of the following statements is in accordance with the Arrhenius equation?

Answer»

Rate of a reaction INCREASES with increase in temperature.
Rate of a reaction increases with decrease in activation energy.
Rate constant DECREASES exponentially with increase in temperature.
Rate of a reaction does not change with increase in activation energy.

Solution :The rate of reaction increases with emperature. It BECOMES DOUBLE with every `10^@` change. It increases with decreases in activation energy.
Discussion
18273.

Which of the following intermediate species is/are formed in the reaction of acrylic acid with HBr to give beta-bromopropanoic acid? H_(2)C=CH-COOHoverset(HBr)to BrCH_(2)-CH_(2)-COOH

Answer»




ANSWER :A::B::C::D
Discussion
18274.

Which of the following has the lowest atomic volume ?

Answer»

AL
B
F
O

Answer :C
Discussion
18275.

Which of the following solid compound possess crystalline properties?

Answer»

S and P like non-METALS 
NACL and Nepthelene like compound 
Cu and FE like metals 
(A), (B) and (C) all THREE 

Answer :D
Discussion
18276.

Two half cell reaction of an electrochemical cell are given below: MnO_(4)^(-)(aq)+8H^(+)(aq)+5e^(-)toMn^(2+)(aq)+4H_(2)O(l),""E^(@)=+1.51V Sn^(2+)(aq)toSn^(4+)(aq)+2e^(-),""E^(@)=+0.15V Construct the redox reaction from the two half cell reaction and predict if this reaction favours formation of reactants or products shown in the equation.

Answer»

Solution :Multiplying first EQN. by 2 and second eqn. by 5 to cancel out the electrons, and adding, the redox reaction will be `2MnO_(4)^(-)+16H^(+)+5Sn^(2+)to2Mn^(2+)+5Sn^(4+)+8H_(2)O`
OXIDATION potential of 2nd reaction`=-0.15` V (as the given value is reduction potential). Hence, if oxidation occurs on `Sn^(2+)//Sn^(4+)` electrode, `E_(CELL)^(@)=1.51+(-0.15)V=1.36V`, i.e., it will be +ve, hence, reaction will FAVOUR FORMATION of products as represented above.
Discussion
18277.

What is tha msimilarity between Raoult's Law and Henry's Law ?

Answer»

Solution :In both the cases, the PARTIAL pressure of the VOLATILE componentis proportional to its MOLE FRACTION in the solution.
Discussion
18278.

Which of the following do not contain an acyl group

Answer»

ACID chloride
Amide
Ester
Ether

Answer :D
Discussion
18279.

The resistanceof 1 N solution of acetic acid is 250 ohm when measured in a cell of cell constant 1.15 cm^(-1). Theequivalent conductance (in "ohm"^(-1) cm^(2)eq^(-1)) of 1 N acetic acid is :

Answer»

`4.6`
`9.2`
`18.4`
`0.023`

ANSWER :A
Discussion
18280.

Which among these is /are correctly matched ?

Answer»

Position emission : N/p ratio increase
K - electron capture : n/p decrease
`beta` - DECAY : n/p ratio decreases
`alpha`- decay : n/p ratio increases

Solution :(n/p) increases when
i) `alpha` - decay,ii) POSITRON emission III) K- `e^(-)` capture `((n)/(p))` decreases when `beta` - decay takes place
Discussion
18281.

Which is nucleophile

Answer»

`BF_(3)`
`NH_(3)`
`BeCl_(2)`
`H_(2)O`

Solution :`NH_(3)` PRESENCE of LONE pair of electrons.
Discussion
18282.

What amount of electricity can deposit 1 mole of Al metal at cathode when passed through molten AlCl_(3) ?

Answer»

`0.3 F`
`1 F`
`3F`
`1//3F`

Solution :`AL^(3-) + 3e rarr AI`
1 mole electrons `-=` Faradays CHANGE
`therefore` 3 moles electrons `-=` 3 FARADAY change
Discussion
18283.

The standard of emf of the following cell is 0.463V Cu| Cu^(++) (1 M) || Ag^(+) (1M) |Ag. If E_(Ag)^(@) = 0.800 V, What is the standard potential of Cu electrode?

Answer»

1.137 V
0.337 V
0.463 V
`-0.463` V

Answer :B
Discussion
18284.

Whichof the followingcompound does notreactwith NaNO_(2)and HCl

Answer»

`C_(6)H_(5)- NH_(2)`
`CH_(3)- CH_(2) - NO_(2)`
`C_(2) - CH_(2) - NH_(2)`
`(CH_(3))_(3) C - NO_(2)`

ANSWER :D
Discussion
18285.

What will be the product formed when propan-1,2,3-triol is treated with KHSO_4 ?

Answer»

NITROGLYCERINE
TNG
PROP- 2 - enal
ALLYL alcohol

Solution :Prop- 2 - enal
Discussion
18286.

Two compounds are allowed to react with Br, in presence of KOH in the same reaction medium. The products obtained are (*indicates nitrogen atom is labelled)

Answer»




SOLUTION :HOFFMANN BROMIDE `"REA"^(N)`
Discussion
18287.

When an aqueous solution of copper sulphate is electrolysed using copper electrodes the reactionat the anode is represented by

Answer»

`H^(+) +e^(-) RARR H`
`Cu^(2+) +2E^(-) rarr Cu`
`SO_(4(aq))^(2-) rarr SO_(4)+2e^(-)`
`Cu_((s)) rarr Cu_((aq))^(2+) +2e^(-)`

Discussion
18288.

What volume (in mL) of liquid H_2O_2 has same number of molecules as there are number of molecules in 22.4 ml H_2O(g) at 2 atm and 546 K. [Given Density of liquid H_2O_2=6.8xx 10^(-3) gm/ml]

Answer»


ANSWER :5
Discussion
18289.

What is meant by pyrometllurgy?

Answer»

SOLUTION :It is the process in which a crude metal is EXTRACTED by the REDUCTION of its ORE at HIGH temperature.
Discussion
18290.

What are antibiotics ? Give an example.

Answer»

Solution :The CHEMICAL substances produced or derived from micro organisms which can inhibit the growth or even destrox the micro organisms are CALLED antibiotics. e.g. PENICILLIN
Discussion
18291.

Write structures of the compound whose IUPAC names are as follows :4-Chloro-3-ethylbutane-1-ol

Answer»

SOLUTION :`ClCH_2 UNDERSET(C_2H_5)underset(|)CHCH_2 - CH_2 OH`
Discussion
18292.

Which ore contains both Cu and Fe?

Answer»

Cuprite
Chalcocite
CHALCOPYRITE
Malachite

Solution :Chalcopyrites `(CuFeS_(2))` CONTAINS both Cu & FE
Discussion
18293.

Which among the followingcompoundsdoes not act as reducingagent ?

Answer»

`H_2O`
`H_2S`
`H_2Se`
`H_2Te`

ANSWER :A
Discussion
18294.

Which is not a buffer solution

Answer»

`NH_(4)Cl + NH_(4)OH`
`CH_(3)COOH + CH_(3)COONA`
`CH_(3)COONa`
Borax + Boric acid

Solution :It is not a mixture of weak acid or base and their strong SALT.
Discussion
18295.

Which of the following substance does not give iodoform test

Answer»

`C_(6)H_(5)CN`
`RNH_(2)`
`CH_(3)OH`
All

Answer :D
Discussion
18296.

What are important characteristics of a non-ideal solution showing negative deviations ?

Answer»

Solution :Positive deviations from Raoult.s law : Here the partial PRESSURE component .A. in the mixture of .A. and .B. is more than that calculated from Raoult.s law. Similarly, the partial vapour pressure of component .B. can be higher than calculated from Raoult.s law. For example, WATER and ethanol, chloroform and water, BENZENE and methanol, acetic ACID and toluence, acetone and ethanol, methanol and `H_2O `. In other words, force of attraction between`A harr B lt A harr A and B harr B.`
For positive deviation, `Delta H_("Mixing") = + ve and Delta V _("(mix)")= + v e`
Negative deviations from Raoult.s law : (Here the partial vapour pressure of component .A. is found to be less than calculated from Raoult.s law on adding the second component .B.. When .A. is added to .B., the partial vapour pressure of solution is less than that of ideal solution of same composition. For example, chloroform and acetone, chloroform and methyl acetate, `H_2Oand HCI, H_2 O and HNO_3` etc.
Discussion
18297.

What are basic oxides ? Give example.

Answer»

Solution :The oxides which give a base with water are called BASIC oxides.
`CaO+H_(2)Orarr CA(OH)_(2)`
Examples : `CaO, Na_(2)O, BaO` ETC.
Note : Generally metallic oxides with lower oxidation STATES are basic oxides.
Discussion
18298.

Which of the following is not correct match ?

Answer»

PHENOL + Pthalic anhydride ` to ` phenolphthaline
Phenol + Chloroform + Base`to` salicylic acid
Phenol + Methanal + `H^(+) to `BAKELITE
Phenol + dil`HNO_(3) to `o, p - nitrophenol

Answer :B
Discussion
18299.

The standard H electrode is written as :

Answer»

`Pt,H_2,H^+ (a=1)`
`Pt(H_2)//H^+(a=1)`
`PtH_2(G)(1 ATM)//H^+(a+1)`
None

Answer :C
Discussion
18300.

Which is used as disinfectant ?

Answer»

BORIC acid
Sulphuric acid
Phosphorus acid
Phosphoric acid

Answer :A
Discussion