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8701.

Which are the monomer of Buna-S rubber ?

Answer»

STYRENE and Butadiene
ISOPRENE and Butadiene
Vinyl CHLORIDE and Sulphur
Butadiene and vinyl chlonide

SOLUTION :Styrene and Butadiene
Discussion
8702.

Which set of elements among the following are called non-transitional elements

Answer»

CU,Ag and Au
Fe,Co and Ni
Zn,Cd and Hg
Re, OS and Ir

Answer :C
Discussion
8703.

which of the following groups will decrease the acidity of parent acid:

Answer»

`(-OH)`
`(-CH_3)`
`(-CL)`
All

Answer :B
Discussion
8704.

Which of the following is not correct metched ?

Answer»

`GT C = O underset("reduction ")overset("Clemmenson's") to gt CH_(2)`
`gt C = O underset("reduction ")overset("Wolff-Kishner") togt CH - OH`
`-COClunderset("reduction ")overset("ROSENMUND's") to- CHO`
`-C -=N underset("reduction ")overset("Stephen's") to-CHO`

Answer :B
Discussion
8705.

The solubility products of Al(OH)_3 and Zn(OH)_2 are 8.5xx 10^(-23) and 1.8 xx 10^(-14) respectively. If NH_4 OH is added to a solution containing Al^(3+) and Zn^(2+) ions, then substance precipitated first is

Answer»

Al`(OH)_2`
`Zn(OH)_2`
both simultaneously
NONE of these

Solution :Since ` K_(sp)`of AI `(OH)_3` is lessthan ` K_(sp)`of ` Zn (OH)_2`
thussolubilityof `AI (OH)_3`is lessthan ` Zn(OH)_2`. HENCE`Al (OH)_3` willprecipitatefirst .
Discussion
8706.

Which one a gem-dihalide?

Answer»

`CH_(2)CHBrCH_(2)CH_(2)BR`
`CH_(2)BrCH_(2)Br`
`CH_(3)CHBrCH_(2)Br`
`CH_(3)CHBr_(2)`

Answer :D
Discussion
8707.

Which of the following has the lowest melting point?

Answer»

B
Ga
Al
Tl.

Answer :B
Discussion
8708.

What is single electrode potential? How is it dependent on various factors ?

Answer»


ANSWER :
Discussion
8709.

Why are NI (II)compoundsthermodynamicallymore statethan Pt (II)compounds ?

Answer»

Solution :(i) The ionisationenthalpyvaluescan beusedto predictthe thermodynamicstabilityoftheircompounds.
(II)LET uscomparethe ionisationenergyrequiredfo form `NI^(2+)` and `Pt^(2+)` ions .
(iii) For Nickel `IE_(2), + IE_(2) =(737 + 1753)`
(iv)forplatinum`IE_(1)+ IE_(2)= (864+ 1794) `
(v ) Sincethe energyrequiredto form `Ni^(2+) ` isless than that of `Pt^(2+)` , Ni(II)compoundsare thermodynamicallymorestablethanPt (ii)compounds
Discussion
8710.

Total number of transuranic elements present in periodic table are

Answer»

11
25
29
20

Answer :B
Discussion
8711.

The relative reactivities of acyl compounds towards nucleophilic substitution are in the order of :

Answer»

Ester `GT` ACYL chloride `gt` Amide `gt` Acid ANHYDRIDE
Acid anhydride `gt` Amide `gt` Ester `gt` Acyl chloride
Acyl chloride `gt` Amide `gt` Acid anhydride `gt` amide
Acyl chloride `gt` Acid anhydride `gt` Ester `gt` Amide

Answer :D
Discussion
8712.

Which one of the following is employed its a tranquilizer drug ?

Answer»

PROMETHAZINE
Valium
Naproxen
Mifipristone

ANSWER :B
Discussion
8713.

Which of the following organic compounds answers both iodoform test and Fehling's test?

Answer»

Ethanal
Propanone
Ethanol
methanol

Answer :A
Discussion
8714.

Which are used for cleaning the glass and ceramic ware ?

Answer»

Anionic
Cationic
Non-ionic
All of the given

Solution :Non-ionic
Discussion
8715.

Which of the following oxyacids acts as most reducing agent?

Answer»

<P>`H_(3)PO_(3)`
`H_(3)PO_(4)`
`H_(4)P_(2)O_(6)`
`H_(4)P_(2)O_(6)`

Answer :A
Discussion
8716.

The vapour pressure of water is 12.3 kPa at 300 K. Calculate vapour pressure of 1 molal solution of a non - voltaile solute in it.

Answer»

SOLUTION :1 molal solution means 1 mol of the solute is present in 1000 g of the solvent (WATER).
Molar mass of water = 18 g `mol^(-1)`
Therefore, Number of moles present in 1000 g of water `= (1000)/(18)=55.56` mol
Therefore, MOLE fraction of the solute in the solution is,
`x_(2)=(1)/(1+55.56)=0.0177`
It is given that,
Vapour presure of water `(p_(1)^(0))=12.3` kPa
Applying the relation,
`(p_(1)^(0)-p_(1))/(p_(1)^(0))=x_(2)=0.0177`
`x_(2)=(12.3-p_(1))/(12.3)=0.0177`
`RARR p_(1)=12.0823`
= 12.08 kPa (approximately)
Hence, the vapour pressure of the solution is 12.08 kPa.
Discussion
8717.

Which of the following compounds are administered as antacids ?

Answer»

SODIUM CARBONATE
Sodium HYDROGEN carbonate
Aluminium carbonate
Magnesium hydroxide

Answer :B::D
Discussion
8718.

Which is formed when iron reacts with carbon?

Answer»

`FeC_2`
`Fe_3C`
`FeC_3`
`Fe_2C`

ANSWER :B
Discussion
8719.

Which among the following is strongest acid?

Answer»




ANSWER :D
Discussion
8720.

Which of the following reagents can be used to oxidize primary alcohols to aldehydes ?

Answer»

`CrO_(3)` in anhydrous medium
` KMnO_(4)` in ACIDIC medium
Pyridinium chlorochromate
Heat in presence of Cu at 573 K

Answer :A::C::D
Discussion
8721.

Which of the following types of carbonyl groups will produce an oxime on reaction with NH_2OH

Answer»

`R-UNDERSET(O)underset(||)C-NH-CH_3`
`R-underset(O)underset(||)C-OH`
`R-underset(O)underset(||)C-OCH_3`
`R-underset(O)underset(||)C-H`

ANSWER :B
Discussion
8722.

Which of the following is coated over iron articles to protect iron from corrosion?

Answer»

Paint
Zinc metal
Tin metal
All of these

Answer :D
Discussion
8723.

Which of the following mixture is called Aquaregia ?

Answer»

TWO parts of cone. HCl and two parts of cone. `HNO_(3)`
Three parts of dil.HCl and 1 PART of cone. `HNO_3`.
Three parts of cone. HCl and 1 part of dil. `HNO_3`.
Three parts of cone. HCl and 1 part of cone. `HNO_(3)`

ANSWER :D
Discussion
8724.

What happens when (Give equation only) (i) Calcium acetate is heated. (ii) Acetaldehyde is heated with aqueous sodium hydroxide solution (iii) Formaldehyde reacts with sodium hydroxide. (iv) Acetone is treated with HCN and the products is boiled with an acid. (v) Formaldehyde is treated with methyl magnesium bromideand the product is then hydrolysed. (vi) Ammonia reacts with formaldehyde. (vii) Ammonia reacts with acetone (vii) Chloral is heated with aquesous sodium hydroxide. (ix) Acetdehyde reacts with Fehling's solution (x) Acetone is deistilled with conc. H_(2)SO_(4)

Answer»

SOLUTION :
`C Cl_(3)CHO+NaOHrarrCHCl_(3)+HCOONa`
`CH_(3)CHO+2CurarrCH_(3)COOH+Cu_(2)O("Red ppt")`
Discussion
8725.

Write the balanced chemical equation for the reaction of Cl_2 with hot and concentrated NaOH. Is this reaction a disproportionation reaction ? Justify.

Answer»

SOLUTION :`3Cl_(2) + 6NaOH to 5NaCl + NaClO_(3) + 3H_(2)O`
Yes, chlorine from ZERO oxidation STATE is changed to (-1) and (+5) oxidation states.
Discussion
8726.

Which hybridisation results non-planar orbitals?

Answer»

SP
`sp^2 `
`sp^3`
`dsp^2`

ANSWER :C
Discussion
8727.

Write the common and IUPAC name of first five members of aldehyde.

Answer»

SOLUTION :(a) HCHO `rarr` FORMALDEHYDE `rarr` Methanal
(B) `CH_3CHO rarr` Acetaldehyde` rarr` Ethanal
[C] `C_2H_5CHO rarr` Propionaldehyde`rarr` Propanal
(d) `C_3H_7CHO rarr`BUTYRALDEHYDE`rarr` butanal
Discussion
8728.

Which of the following compounds would not react with Lucas reagent at room temperature?

Answer»

`H_(2)C = CHCH_(2)OH`
`C_(6)H_(5)CH_(2)OH`
`CH_(3)CH_(2)CH_(2)OH`
`(CH_(3))_(3)COH`

Solution :The order of reactivity of ALCOHOLS towards LUCAS reagent is
`3^(@) "alcohol" gt2^(@) "alcohol" gt ^(@) "alcohol"`.
`1^(@)` alcohols do not react with Lucas reagent at room TEMPERATURE. It requires HIGH temperature. The benzyl and allyl alcohols react as rapidly as `3^(@)` alcohols with Lucas reagent because their cations are resonance STABILISED and stable as `3^(@)` cations.
Discussion
8729.

Which metal has lowest melting point?CsHgMnCu

Answer»

`Cs`
`Hg`
`MN`
`Cu`

ANSWER :B
Discussion
8730.

The solubility of noble gases in water shows the order:

Answer»

`HegtArgtKrgtNegtXe`
`HegtNegtArgtKrgtXe`
`XegtKrgtArgtNegtHe`
None

Answer :C
Discussion
8731.

Which reaction is not effected by change in pressure

Answer»

`H_(2)+I_(2)hArr2HI`
`2C+O_(2)hArr2CO`
`N_(2)+3H_(2)hArr2NH_(3)`
`PCl_(5)hArrPCl_(3)+Cl_(2)`

Solution :`H_(2)+I_(2)hArr2HIimpliesDeltan=2-2=0.`
Discussion
8732.

Which type of colloid is a sol ?

Answer»

SOLID in liquid
liquid in solid
solid in solid
GAS in solid

ANSWER :A
Discussion
8733.

What is the productformed when adipic acid is heated ?

Answer»


ANSWER :B
Discussion
8734.

What is the colour of K_(2)MnO_(4)?

Answer»

RED
Violet
Green
Blue

Answer :C
Discussion
8735.

To produce 160 g of oxygen , the number of mole of water required to be electrolysed is

Answer»

2.5
5
10
20

Solution :`H_(2) O to H_(2) + (1)/(2) O_(2)`.
Mole ratio of `H_(2)O : O_(2) :: 1 : (1)/(2)IMPLIES 1 : 0.5`
`therefore` For 1 mole of `H_(2)O -= 0.5 ` moles = 16 G of `O_(2)` .
n moles of `H_(2)O -= 160` g of `O_(2)` .
No. of moles of WATER REQUIRED `therefore n = (160)/(16) = 10`
Discussion
8736.

Which complex is likely to show optical activity?

Answer»

TRANS-`[CO(NH_(3))_(4)Cl_(2)]^(+)`
`[Cr(H_(2)O)_(6)]^(3+)`
cis-`[Co(NH_(3))_(2)(EN)_(2)]`
trans-`[Co(NH_(3))_(2)(en)_(2)]^(3+)`

Answer :A
Discussion
8737.

What is the osmotic pressure of a solution (in torr) made by mixing 20 mL of 0.01 M BaCl_(2) with 30 mL of 0.01 M NaF at 27^(@) C?K_(sp)(BaF_(2))=2.4xx10^(-5).R=0.082 lit atm mol^(-1)K^(-1), 1 atm=760 torr.

Answer»


ANSWER :448 or 449
Discussion
8738.

What is the product formed when ethyl acetate is reduced with Na/alcohol?

Answer»

SOLUTION :ETHYL ALCOHOL
Discussion
8739.

What is the odour of lower aliphatic amines ?

Answer»


ANSWER :FISHY
Discussion
8740.

The strongest acid amongst the following compounds is

Answer»

HCOOH
`CH_(3)CH_(2)CH(Cl)CO_(2)H`
`ClCH_(2)CH_(2)CH_(2)COOH`
`CH_(3)COOH`

Solution :SINCE -I-effect decreases with distance, therefore, `CH_(3)CH_(2)CH(Cl)COOH` is a stronger acid than `ClCH_(2)CH_(2)CH_(2)COOH`. Thus, option (b) is CORRECT.
Discussion
8741.

Which one has the highest bond energy ?

Answer»

O-O
S-S
Se-Se
Te-Te

Answer :B
Discussion
8742.

Which process represent the change, Ti + 2I_2 rarr TiI_4 rarr Ti + 2I_2

Answer»

Cupellation
van Arkel
Poling
Zone REFINING

ANSWER :B
Discussion
8743.

Which one of the following can be oxidised to the corresponding carbonyl compound ?

Answer»

2-hydroxypropane
Ortho-nitrophenol
Phenol
2-methyl-2 hydroxypropane

Solution :Carbonyl COMPOUNDS (aldehydes and ketones) are obtained by the oxidation of `1^@` and `2^@`alcohols RESPECTIVELY. Among the given options, only (a) is `2^@` alcohol hence it can be oxidized to KETONE.
`UNDERSET"2-hydroxypropane"OVERSET"OH"overset|(H_3C CHCH_3) overset"oxidation"to underset"Acetone"overset(O) overset(||)(H_3 C C C H_3)`
Discussion
8744.

Which one of the following metals is required as co-factor by all enzymes utilizing ATP in phosphate transfer?

Answer»

K
Ca
NA
Mg

Solution :Mg acts as a cofactor to the enzyme as it forms COMPLEX with phosphate GROUP of ATP that is utilized in the TRANSFER of ATP phosphate.
Discussion
8745.

The resistance of 0.5 N solution of an electrolyte in a conductivity cell was found to be 25 ohm. Calculate the equivalent conductivity of the solution if the electrodes in the cell are 1.6 ci apart and have an area of 3.2 cm^2 ?

Answer»

` 10 S CM^2 eq^(-1)`
`15 cm^(2) eq^(-1)`
`20 S cm^(2) eq^(-1)`
`40 S cm^(2) E`

Solution :`40 S cm^(2) e`
Discussion
8746.

Which rule governes the oxidation of unsymmetrical ketone?

Answer»

Markovnikoff 's RULE
Popoff's rule
ANTIMARKOVNIKOFF's rule
Hund's rule

SOLUTION : Popoff.s rule
Discussion
8747.

The volume of water of be added to 50 cm^(3) of a decimolar solution to convert it to a centimolar solution will be

Answer»

`500 cm^(3)`
`450 cm^(3)`
`400 cm^(3)`
`100 cm^(3)`

SOLUTION :Before dilutionequiv After dilution
`M_(1) V_(1) = M_(2) V_(2)`
`0.1 xx 50 = 0.01 xx V_(2)`
`:. V_(2)=500 cm^(3)`
:. Volume of water ADDED `=500-50=450 cm^(3)`
Discussion
8748.

Which of the following is not a condensation polymer?

Answer»

Glyptal
Nylon-66
DACRON
PTFE

Solution :Dacron
Discussion
8749.

Which of the following is not a lanthanoid element?

Answer»

Cerium
Europium
Lutetium
Thorium
Discussion
8750.

Write possible isomers having molecular formulae (a) C_(4)H_(9)Br (b) C_(3)H_(6)O_(2). Give their IUPAC names.

Answer»

SOLUTION :(a) `C_(3)CH_(2)CH_(2)CH_(2)Br`
Discussion