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17951.

Whichone is true organo metallic compound:

Answer»

LITHIUM methoxide
Lithium acetate
Lithium DIMETHYL amide
Methyl lithium

Answer :D
Discussion
17952.

When acetaldehyde is heated with Fehling solution, a red precipitate is formed. Which of the following is that ?

Answer»

`Cu_2O`
Cu
CuO
`CuSO_4`

ANSWER :A
Discussion
17953.

Which of the following does not gives Friedel-Crafts reaction ?

Answer»




ANSWER :BCD
Discussion
17954.

When sucrose is heated with conc.HNO_3, the product is:

Answer»

SUCROSE nitrate
Formic ACID
Oxalic acid
CITRIC acid

ANSWER :C
Discussion
17955.

What is weak electrolyte ? Explain relation between concentration of weak electrolyte and molar conductivity with suitable graph.

Answer»

Solution :* (a) Weak electrolyte : Electrolytes which gives minimum ionization in its aqueous solution are known as weak electrolyte. They give ionic equilibrium in their aqueous solution. E.g., `CH_(3)COOH, NH_(4)OH` etc are examples of weak electrolyte.
* (b) `Lamda_(m)` of weak electrolyte of solution and concentration : For such electrolytes, the change in `Lamda_(m)` with dilution is due to increase in the DEGREE of DISSOCIATION and consequently the number of ions in total VOLUME of solution that contains 1 mol of electrolyte.
"ACCORDING to Ostwald.s law of dilution, the conductivity of weak electrolyte solution is significantly increasing with decrease in concentration of solution with weak electrolyte. (e.g., `CH_(3)COOH`)".
* (c) Explanation of conductivity on dilution :
Dissociation constant of weak electrolyte like acetic acid is low at higher concentration. So change in conductivity of solution of weak electrolyte, increases withthe increase in degree of dissociation. hence, total value of solution with solution of 1 mol of weak electrolyte increases with dilution and molar conductivity significantly increases with the increase in number of ions.

* Limiting molar conductivity of weak electrolyte and measurement of A:
* The graph is not linear, but it is curve. in this graph accurate slope is not OBSERVED and so we couldn.t get accurate value for slope and A.
* This graph doesn.t possess intercept, so we cant.s obtain the value of `Lamda_(m)^(@)`, because there is no intercept even at zero concentration of `Lamda_(m)` value.
Discussion
17956.

Which of the following gives SN^(1) reaction more easily ?

Answer»

`CH_(3)Cl`
`C_(6)H_(5)CH_(2)Cl`
`CH_(2)=CH-CH_(2)-Cl`
`CH_(2)=CH-Cl`

Solution :Compound which produced more STABLE carbocation undergoes EASILY `SN^(1)` rreaction.
BENZYL carbocation is more stable than allyl, vinyl and methyl carbocation.
Discussion
17957.

Which of the following statements is correct regarding alkali metals

Answer»

cation is less STABLE than the ATOM
Cation is SMALLER than the atom
Size of cation and atom is the same
Cation is greater in size than the atom

SOLUTION :After removal of an electron the effective nuclear charge per electron INCREASES hence the size decreases.
Discussion
17958.

What bond order doesO_2^(2-)have :

Answer»

1
2
3
44198

Answer :A
Discussion
17959.

Which protein is main constituent of milk ?

Answer»

Casein
INSULIN
Myosine
Keratin

Solution :PROTEIN PRESENT in MILK is casein
Discussion
17960.

What is the main reaction take place when 2-methyl propan-2-ol reacts with Cu at 573 K?

Answer»

DEHYDROGENATION
OXIDATION
DEHYDRATION
Hydrogenation

Solution :Dehydration
Discussion
17961.

What is the correct order of oxidation states ofsuphur in anions So_(3)^(2-),S_(2)O_(4)^(2-) and S_(2)_(6)^(2-) ?

Answer»

`S_(2)O_(4)^(2-) LT SO_(3)^(2-) lt S_(2)O_(6)^(2-)`
`S_(2)O_(6)^(2-) lt S_(2)O_(4)^(2-) lt SO_(3)^(2-)`
`SO_(3)^(2-) lt S_(2)^O_(4)(2-) lt S_(2)O_(6)^(2-)`
`S_(2)O_(4)^(2-) lt S_(2)O_(6)^(2-) lt SO_(3)^(2-)`

Answer :A
Discussion
17962.

What happens when CO_(2)(g) is passed through sodium meta borate solution?

Answer»

Solution :`4NaBO_(2)+CO_(2)toNa_(2)B_(4)O_(7)+Na_(2)CO_(3)`
Discussion
17963.

The structure of MgO is similar to NaCI. The co-ordination number of Mg is:

Answer»

2
6
4
8

Answer :B
Discussion
17964.

There is very little difference in acid strength in the acids H_3PO_4 , H_3PO_2 because

Answer»

Phosphorus in these acids exists in DIFFERENT OXIDATION states
The hydrogen in these acids exists are not all bound to the phosphorus and have same NUMBER of unprotonated oxygen
Phosphorus is highly electronegative element
Phosphorus OXIDES are less basic

Answer :B
Discussion
17965.

Which element is the end product of each natural radioactive series

Answer»

Sn
Bi
PB
C

Solution :Pb is the END product of each NATURAL RADIOACTIVE series
Discussion
17966.

Which of the following aqueous solutions have highest pH at 25^(@)C ? [Given that at 25^(@)C H_(2)CO_(3) pKa_(1) = 8, pKa_(2) = 12 and H_(3)PO_(4)pKa_(1) = 4, pKa_(2) = 7, pKa_(3) = 13]

Answer»

`10^(-10) M HCl`
`10^(-10) M NaOH`
`10^(-3)M Na_(2)CO_(3)`
`10^(-3) M KH_(2)PO_(4)`

Solution :`10^(-10)MHCl` : ACIDIC solution `pH square 7`
`10^(-10) M NaOH` , Alkaline solution `pH square 7`
`10^(-3)M Na_(2)CO_(3)`, Salt of W.A/S.B `pH= 7+ (1)/(2) [12 + (-3)]= 7+ 4.5= 11.5`
`KH_(2)PO_(4)` is a salt of amphoteric anion. Its pH is GIVEN by the RELATION `(pKa_(1) + pKa_(2))/(2)= 5.5`
Discussion
17967.

What happens when? (i) Acetamide is heated with bromine and potassium hydroxide. (ii) Methylamine is treated with chloroform and alcoholic solution of potassium hydroxide. (iii) Ethylamine is treated with acetic anhydride. (iv) Ethylamine reacts with carbon disulphide in presence HgCl_(2) (v) Ethylamine is treated with nitrous acid. (vi) Ethyl cyanide is treated with methyl magnesium bromide followed by hydrolysis. (vii) Nitroethane is reduced with zinc and ammonium chloride. (vii) Nitropropane is treated with nitrous acid. (ix) Ethyl nitrite is reduced with LiAIH_(4). (x) Alkyl cyanide is reduced with sodium metal in (xi) Aniline reacts with sodium nitrite and hydrochloric (xii) o-Bromoanisole is treated with sodamide in liquid amonia.

Answer»

SOLUTION :
Discussion
17968.

Which of the following isotopes will shows radioactive disintegration?

Answer»

`._(83)Bi^(209)`
`._(82)Bi^(210)`
`._(6)C^(12)`
`._(82)PB^(206)`

Answer :B
Discussion
17969.

Write molecular formula and structural formula of BHA.

Answer»

SOLUTION :Butylated hydroxy ANISOLE (BHA) :
Chemical NAME : 2 - tertbutyl-4-methoxy phenol
Discussion
17970.

Which of the following statemets are correct regarding : H_(2)P-PH-PH-PH-PH_(2)

Answer»

It exhibits optically isomerism
It has two optically inactive isomers.
It has two optically active isomers.
It has THREE diastereomers.

Solution :`H_(2)P-PH-PH-PH-PH_(2)` has four STEREOISOMERS

I,II and III or I,II and IV are diasteremers
Discussion
17971.

Which of the following relationship is/are not true ?

Answer»

Most prabable velocity `prop =sqrt((3RT)/(m))`
`PV=(2)/(3)kT`
Compressibility factor `Z=(PV)/(nRT)`
AVERAGE KINETIC energy of a gas `=(1)/(2)kT`

Solution :(A) Most probable velocity `=prop =sqrt((2RT)/(m))`
(D) Average kinetic energy of a gas `=(3)/(2)kT`
Hence, (A) and (D) are the CORRECT answer.
Discussion
17972.

Which of the following type of molecules form micelles?

Answer»

Non-polar MOLECULES
Polar molecules
Surfacant molecules
All of these

ANSWER :C
Discussion
17973.

Total per halo compounds possible for ethane is

Answer»


SOLUTION :`C_2Cl_6`
Discussion
17974.

Which one of the following complexes exhibit chirality?

Answer»

(a) `[Cr(o X)_3]^(3-)`
(b) `cis-[PtCl_2(en)]`
(C) `cis-[RhCl_2(NH_3)_4]^(+)`
(d) `mer-[Co(NO_2)_3 (DIEN)]`

Solution :Chiral molecules have a degree of asymmetry that MAKES their mirror images non-superimposable. So (a) will exihit chirality.
Discussion
17975.

What are the merits and limitations of the intermediate compound theory ?

Answer»

Solution :MERITS :
(i) The specificity of a catalyst
(II) The INCREASE in the rate of the reaction with increase in the concentration of catalyst.
LIMITATIONS :
(i) This theory fails to explain the action of CATALYTIC poison and promoters.
(ii) This theory is unable to explain the mechanism of heterogeneous catalysed reactions.
Discussion
17976.

Which of the following are possible products in the above reaction?

Answer»




SOLUTION :SN-REACTION.
INVOLVE RING EXPANSION reaction.
Discussion
17977.

The use of chemicals for treatment of diseases is called as :

Answer»

CHEMOTHERAPY
PHARMACOLOGY
pharmacy
chemotherapeutic agent

Answer :A
Discussion
17978.

Which is more reactive towards S_(E) and explain?

Answer»


SOLUTION :N//A
Discussion
17979.

Which of the following will be most ready dehydrated in acidic conditions ?

Answer»





Solution :Aldols, i.e. `beta`-hydroxyaldehydes or `beta`-hydroxyketones readily undergo DEHYDRATION to form `ALPHA, beta`-unsaturated aldehydes or ketones.

HENCE (A) is the correct answer.
Discussion
17980.

Which of the following statements is not correct regarding boron triffiluoride?

Answer»

It can FORM an adduct
In ACTS as a Lewis base
It forms ionic bond
It ALSO forms DATIVE bond with compound like `NH_3`

Answer :B
Discussion
17981.

Which one is a polymer compound :

Answer»

`SO_2`
`CO_2`
`CH_4`
PVC

Answer :D
Discussion
17982.

Which of the following compounds is resolvable ? .

Answer»

`CH_(3)CH_(2)CH_(2)CH(CH_(3))NH_(2)`
`[CH_(2)=CHCH_(2)underset(Ph)underset(|)(N)(CH_(3))(CH_(2)H_(5))]^(+)I^(-)`

All of these

Solution :In the first compound the chirality is due to the presence of the chiral `2^(@)` penty1 carbon chain In the second compound N atom uses `sp^(3)` hybridized orbital to from four sigma bonds to four different LIGANDS The resulting cationic enantiomers are configurationally stable at ROOM temperature because there is no lone PAIR to permit N inversion In the third compound N inversion requires too high energy of activation because the N in such a small ring cannot attain the `120^(@)` angles required in the TS .
Discussion
17983.

When KMnO_(4) reacts with KBr in acidic medium then oxidation state of Mn changes from +7 to :-

Answer»

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

ANSWER :A
Discussion
17984.

The solubility of PbCl_2 in water is 0.01 M at 25^@C it maximum concentration in 0.1M NaCl will be :

Answer»

`2xx10^(-3)` M
`1xx10^(-4)` M
`1.6xx 10^(-2)` M
`4xx10^(-4)` M

Answer :D
Discussion
17985.

Which of the following liberate I_(2) from an iodide (NaI) ?

Answer»

`Br_(2)` and `Cl_(2)`<BR>`HNO_(2)`
`ClCH_(2) - CH_(2) Cl`
`SO_(2)`

Solution :`2KI+Br_(2) rarr 2KBr +I_(2) , NaI + HNO_(2) rarr`
Discussion
17986.

Which of the followmg compounds when heated with CO at 423K and 500 atm pressure in presence of BF_(3) forms ethyl propionate?

Answer»

`CH_(2)H_(5)OH`
`CH_(3)OCH_(3)`
`CH_(3)OC_(2)H_(5)`
`C_(2)H_(5)OC_(2)H_(5)`

ANSWER :D
Discussion
17987.

What does the Van't Hoff factor for a solute in a solvent account for ?

Answer»

SOLUTION :EXTENT of ASSOCIATION or DISSOCIATION of a SOLUTE.
Discussion
17988.

The shape of [Cu(NH_3)_4]^(2+) is square planar, Cu^(2+) in this complex is

Answer»

`sp^3` hybridised
`dsp^2` hybridised
`sp^3d` hybridised
`sp^3d^2` hybridised

Answer :B
Discussion
17989.

(i) Write structures of different isomeric amines corresponding to the molecular formula, C_(4)H_(11)N. ii) Write IUPAC names of all the isomers. (iii) What type of isomerism is exhibited by different pairs of amines?

Answer»

Solution :For (i) and (II) refer to follow up problem 11. (iii) Position ISOMERS : (i) and (ii), (V) and (VI)Chain isomers: (i) and (iii), (vi), (i) and (vii) Metamers: (v) and (vii), (vi) and (vii) Functional isomers: All `1^@`amines are functional isomers of 29 and 30 amines and vice versa.
Discussion
17990.

Which of the following statement about KMnO_4 acting as oxidising agent is not true ?

Answer»

It can be USED as an oxidising AGENT in the presence of dil `H_2SO_4`
In the TITRATION of KMnO4 with Mohr's salt, the equivalent weight of Mohr's salt is same as its molecular weight.
It is necessary to warm the solution to 60 -`70^(@)`C for all `KMnO_4` titrations.
It acts as a self-indicator.

Solution :Only titrations involving liberation of `CO_2` are WARMED.
Discussion
17991.

The temperature at which vapour pressure of a solvent in its liquid and solid phase becomes same is called:

Answer»

B.pt.
f.pt.
Krafft point
None

Answer :B
Discussion
17992.

Which one is antiallergenic drug ?

Answer»

Brompheniramine (Dimetap) 
TERFENADINE (SELDANE) 
(A) and (B) both 
RENITIDINE (Zentac) 

SOLUTION :(A) and (B) both
Discussion
17993.

Which valuable byproduct is obtained in the Down's process for extraction of sodium

Answer»

Oxygen
Hydrogen
Chlorine
1 and 2 both

Answer :C
Discussion
17994.

When 96500 coulombs of electricity are passed through nickel sulphate solution, the amount of nickel deposited will be

Answer»

1 mol
0.5 mol
0.1 mol
2 mol

Solution :1 faraday deposits 1 EQUIVALENT of NICKEL
1 equivalent of `Ni = 1//2` mole of nickel
Discussion
17995.

Which one is the Swartz reaction from the following

Answer»

`CH_(3)Br+NaItoCH_(3)I+NaCl`
`CH_(3)Br+Nal toCH_(3)l+NaBr`
`CH_(3)Br+AgFtoCH_(3)F+AgBr`
`2CH_(3)Cl+2NatoCH_(3).CH_(3)+2NaCl`

Solution :SWARTZ REACTION.
`CH_(3)-Cl+AgF to CH_(3)F +AgCl`
`CH_(3)-Br+AgF to CH_(3)F +AgBr`
Discussion
17996.

When a brown compound of Mn (A) is teated with HCl, it gives a gas (B). The gas (B) taken in excess reacts with NH_(3) to give an explosive compound (C). The compounds A, B and C are

Answer»

`A = MnO_(2), B = Cl_(2), C = NCl_(3)`
`A = MnO, B = Cl_(2), C = NH_(4)Cl`
`A = Mn_(3)O_(4), B = Cl_(2), C = NCl_(3)`
`A = MnO_(3), B = Cl_(2), C = NCl_(2)`

SOLUTION :`{:(UNDERSET((A))(MnO_(2))+4HCL RARR MnCl_(2) + underset((B))(Cl_(2))+2H_(2)O),(" "NH_(3) + 3 underset((B))(Cl_(2))rarr underset((C))(NCl_(3)) + 3 HCl):}`
Discussion
17997.

Which of the following has the highest dipole moment ?

Answer»

`CH_(2)Cl_(2)`
`CHCl_(3)`
`C""Cl_(4)`
`CH_(3)CL`

ANSWER :A
Discussion
17998.

Which of the following complex does not show geometrical isomerism ?

Answer»

`[Co(NH_(3))_(4)Cl_(2)]^(+)`
`[Co(NH_(3))_(3)(NO_(2))_(3)]`
`[Cr(en)_(3)]^(3+)`
`[PT(GLY)_(2)]`

Solution :`[M(A A)_(3)]` does not show G.I.
Discussion
17999.

Which of the following is not deflected by magnetic field

Answer»

Deutrons
Positron
Proton
Photon

Solution :PHOTONS do not CARRY any CHARGE
Discussion
18000.

Which drug relieves from depression and hypertension ?

Answer»

EQUANIL
Luminal
Noradrenaline
All of these 

SOLUTION :Equanil
Discussion