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8901.

What are the final products of the following sequence of reactions? C_(6)H_(6)+CH_(3)CH=CH_(2)overset(Anhy.AlCl_(3))to? underset("Catalyst")overset(O_(2)//130^(@)C)to?overset(H^(+))to?

Answer»

CUMENE and phenol
Phenol and acetone
Cumene and acetone
Benzoic ACID and ethane

Solution :
Discussion
8902.

Zeolites are :

Answer»

WATER softener
Catalyst
Both (a) and (B)
None

Answer :C
Discussion
8903.

Which of the following have the same number of significant figures ?

Answer»

`0.40`
`4.0`
`400`
`0.040`

SOLUTION :FACTUAL QUESTION
Discussion
8904.

Write equations for preparation of propan -2- ol, from (i) an alkene, and (ii) a Grignard reagent.

Answer»

Solution :(i) `UNDERSET("Propene")(CH_(3)-CH=CH_(2)+H_(2)O) OVERSET(H_(2)SO_(4))rarr underset("Propan-2-ol")(CH_(3)-underset(OH)underset("|")"CH"-CH_(3))`
(ii) `underset("ETHANAL")(CH_(3)-overset(OH)overset("|")"C "-H)+underset("bromide")underset("Methyl magnesium")(CH_(3)MGBR) rarr CH_(3)-overset("OMgBr")overset("|")underset(CH_(3))underset("|")"C "-CH_(3)overset(H_(2)O //H^(+))rarr underset("Tertiary butyl alcohol")(CH_(3)-underset(CH_(3))underset("|")overset(OH)overset("|")"C "-CH_(3))`
Discussion
8905.

Which of the following conversions involves change in both hybridisation and shape ?

Answer»

`CH_(4)toC_(2)H_(6)`
`NH_(3)toNH_(4)^(+)`
`BF_(3)toBF_(4)^(-)`
`H_(2)OtoH_(3)O^(+)`

Solution :`{:("Compound","Hybridization","SHAPE"),(CH_(4),sp^(3),"Tetrahedral"),(C_(2)H_(6),sp^(3),"Tetrahedral"),(NH_(3),sp^(3),"Trigonal pyramidal"),(NH_(4)^(+),sp^(3),"Tetrahedral"),(BF_(3),sp^(2),"Trigonal planar"),(BF_(4)^(-),sp^(3),"Tetrahedral"),(H_(2)O,sp^(3),"Angular shaped"),(H_(3)O^(+),sp^(3),"Tetrahedral"):}`
Only option (C ) satisfies the GIVEN CONDITIONS.
Discussion
8906.

'X'overset(HC1)overset(to)((1 eq))"Chloropene." X "is" :

Answer»

`H_(2)C=CH-CH=CH_(2)`
`H_(2)C=CH-C-=CH`
`CH-=C-C-=CH`
`H_(2)C=CH-=CH_(2)-C-=CH`

SOLUTION :
Discussion
8907.

Which of the following drug is used in treatment of typhoid fever ?

Answer»

BROMOPHENERAMINE
CHLORAMPHENICOL
CHLOROQUINE
Iodoform

Answer :B
Discussion
8908.

Which is/are fire extinguishers?

Answer»

DRY powder containing sand +`NaHCO_3`
`NaHCO_3 + H_2SO_4`
Foamite EXTINGUISHERS containing `NaHCO_3 + Al_2(SO_4)_3`
All of the above

Answer :D
Discussion
8909.

Which metal is used as a reducing agent in smelting

Answer»

C
Al
Zn
None of these

Answer :D
Discussion
8910.

Which of the following ligand does not have any nitrogen donor site?

Answer»

bipy
`ACAC^(1-)`
`GLY^(-1)`
dien

Solution :
Discussion
8911.

When an organge crystalline compound (A) was heated with common salt and concentrated sulphuricacid, an orange red gas (B) was evolved. Acidified solution of the comound (A) reacts with H_(2)O_(2) to produce a deep blue solution due to the formation of comopund (C ). The gas (B)on passing through NaOh solution gave a solution (D). The solution on reacting with an aqueous solution of lead acetate gave a yellow precipitate of (E). Name the compounds A,B,C,D ( present in the soluiotn ) and E ( present as ppt.)

Answer»

Solution :`underset("Potassium dichromate")underset((A)) (K_(2)Cr_(2)O_(7)) + 4NaCl + 6H_(2)SO_(4) RARR 2KHSO_(4) + 4NaHSO_(4) + underset( "Chromyl chloride")underset((B)) ( 2CrO_(2)Cl_(2))+3H_(2)O`
`K_(2)Cr_(2)O_(7) + H_(2)SO_(4) + 4H_(2)O_(2) rarr underset("Peroxo compound, " CrO(O_(2))_(2)) underset((B)) (2CrO_(5))+ K_(2)SO_(4) + 5H_(2)O`
`underset((B))(CrO_(2)Cl_(2)) +4NaOH rarr underset("Sodium chromate")underset((D)) (Na_(2)CrO_(4)) + 2NaCl+ 2H_(2)O`
`Na_(2) CrO_(4) + ( CH_(3) COO)_(2)Pb rarr underset("LEAD chromate ( Yellow ppt.)")underset((E )) (PbCrO_(4)) + 2CH_(3) COONa`
Discussion
8912.

When a copper wire is immersed in a solution of AgNO_3 the colour of the, solution becomes blue because copper:

Answer»

Forms a soluble complex with `AgNO_3`
Is oxidized to `CU^(2+)`
Is reduced to` Cu^(2-)`
Splits up into ATOMIC FORM and dessolves

Answer :B
Discussion
8913.

Which process involves corrosion ?

Answer»

BROWN deposits on iron articles
Green deposits on BATTERY terminals
Black deposits on SILVER coin
All of these

Answer :D
Discussion
8914.

'X' will be

Answer»




All of these

Answer :A
Discussion
8915.

Which of the following are required to prepare Buna-S?

Answer»

vinyl cyanide +1,3 - BUTADIENE
CHLORO prene + BUTA -1,3 - DIENE
buta - 1,3 - diene + styrene
isoprene + styrene

Solution :buta - 1,3 - diene + styrene
Discussion
8916.

Which compound set of compounds is used in themanufacture of Nylon - 6, 6?

Answer»

`HOOC(CH_2)_4COOH + H_2N (CH_2)_6 NH_2`
`CH_3-CH_2-C(CH_3)=CH_2 `
`CH-2-CH_2`

SOLUTION :`HOOC(CH_2)_4COOH + H_2N(CH_2)_6 NH_2`
Discussion
8917.

Which of the following shows large number of oxidation state

Answer»

N
P
As
Bi

Answer :A
Discussion
8918.

Which of the following tests could be performed to distinguish between 1-butyene and 2-butyene?

Answer»

`Ag^(+)//NH_(3)`
`Br_(2)//C Cl_(4)`
`H_(2)//PT`
`Hg^(+2)//H_(2)SO_(4)`

Solution :N//A
Discussion
8919.

What is true about lnsulin ?

Answer»

It is an amino ACID
It is a polypeptide
It is a carbohydrate
It is a LIPID

Answer :B
Discussion
8920.

Which is dehydrated to maximum extent using conc. H_(2)SO_(4)?

Answer»




ANSWER :D
Discussion
8921.

Xeropthalmia is caused due to deficiency of ……………….

Answer»

Vitamin A
Vitamin `B_(12)`
Vitamin C
Vitamin E

Solution :Vitamin A
Discussion
8922.

Which of the following alkyl halides undergoes elimination reaction readily?

Answer»

RI
RBr
RCl
RF

Answer :A
Discussion
8923.

Write the structure of chlorous acid [HOCIO]

Answer»

SOLUTION :CHLOROUS ACID :
Discussion
8924.

Which of the following justify the enthalpy driven spontaneity of adsorption process?

Answer»

It is a spontaneous ENDOTHERMIC processin which randomness increases due to force of repulsion between ADSORBENT and adsorbate
It is a a spontaneous exothermic process in which randomness decreases due to force of attraction between adsorbent and adsorbate
It is a spontaneous adiabatic process in which randomness increases due to free EXPANSION of MOLECULE between adsorbent and adsorbate
Itis a NON spontaneous endothermic process in which randomness decreases due to force of repulsion between adsorbent and adsorbate

Answer :B
Discussion
8925.

What areamino acid? Giveitsstructure.

Answer»

SOLUTION :(i) Amino acidsare compoundswhichcontain groupanda carboxylic group . Proteinmolecules are madeup of`alpha , gamma, delta` - amino acids .
(ii) The protein MOLECULES are madeupof `alpha` amino acidswhich canbe reprsentedby thefollowinggeneral FORMUAL .
` R - underset(NH_(2)) underset(|)overset(H)overset(|)(C) - CO OH`
(iii) There are 20 aminoacidscommonlyfoundin proteinmolecules.
Discussion
8926.

Which of the following does not participate in HVZ reaction.

Answer»

`CH_(3) COOH`
`CH_(3) CH_(2) COOH`
`CH_(3) CHClCOOH`
`(CH_(3))_(3) C COOH`

ANSWER :D
Discussion
8927.

What is tincture of iodine ?

Answer»

0.2 to 0.4 PPM AQUEOUS solution of CHLORINE
2-3% aqueous solution of `CH_3COOH`
2-3% solution of IODINE in alcohol-water
None of the above

Solution :2-3% solutionof `I_2` in Alcohol
Discussion
8928.

Whichof the following compounds are administered as antacids ?

Answer»

Sodium CARBONATE
Sodium hydrogencarbonate
Aluminium carbonate
Magnesiumhydroxide

SOLUTION :Antacid is a subtance which neutralizes excess of acid in stomach.
The chemical formula of sodium hydrogen carbonate is `NaHCO_(3)` it is often used as an antacid because it neutralises excess of HCl secreated from the WALLS of stmach.
`NaHCO_(3)(s) + HCl(aq) rarr NaCl(aq) + H_(2)O(l) + CO_(2)`
However, excessive hydrogen carbonate can make the stomach alkaline and trigger the production of EVEN more acid.
Milk of magnesia, which is an aqueous solution of magnesium hydroxide is ALSO used as an antacid.
Discussion
8929.

The structure of sodium chloride is

Answer»

BODY CENTRED CUBIC lattice
Face centred cubic lattice
Octahedral
SQUARE planar

Answer :B
Discussion
8930.

Which of the following are correct about actinoids ?

Answer»

They show large NUMBER of oxidation STATES
They show actinoid contraction
They FORM oxo-cations
All of the are radioactive

Solution :They show variable oxidation states withactinoid contraction
Discussion
8931.

Which of the following gives m-nitro compound on nitration except

Answer»

o-Xylene
m-Xylene
p-Xylene
All at the same rate

Solution :Of the THREE m-isomer is READILY sulphonted to m-xylene-4-sulphonic ACID while o- and p-isomers are not sulphonated
Discussion
8932.

Thiol group is present is

Answer»

cytosine
cystine
CYSTEINE
methionine

Solution :Cysteine `HSCH_(2)CH(NH_2)COOH` contains the THIOL (SH) GROUP.
Discussion
8933.

Which vitamin act as anti-oxidant ?

Answer»

VITAMIN C
Vitamin `B_(1)`
Vitamin A
Vitamin D

Solution :Vitamin C
Discussion
8934.

Which of the following has maximum mass ?

Answer»

25 gram of iodine
2.5 gram atom of OXYGEN GAS
2.5 gram MOLE of water
2.5 gram mole of nitrogen gas

Solution : 2.5 gram mole of nitrogen gas
Discussion
8935.

Which one of the following is non-reducing

Answer»

`H_(2)S`
`H_(2)Te`
`H_(2)Se`
`H_(2)O`

SOLUTION :All hydrides except `H_(2)O` ACT as reducing agents. The reducing nature increases as the ATOMIC NUMBER of the central ATOM increases. This is due to weakening of M-H bond as the bond length increases with increases in size of M -atom.
Discussion
8936.

The reason for the distinct differencein the properties of CO_2 and SiO_2 is

Answer»

<P>CARBON is more electronegative than O and in case of `SiO_2` oxygen is more electronegative than silicon
Carbon has small size and forms a `pi` BOND with good overlap whereas silicon has larger size hence has a poor `pi` - overlap
First ionization potential of carbon is higher than that of silicon
Carbon has only 'p' orbitals and LACKS 'd' orbitals whereas silicon has 'd' orbitals

Answer :B
Discussion
8937.

The values of van't Hoff factors for KCl,NaCl, and K_(2)SO_(4) respectively are………

Answer»

2,2 and 2
2,2 and 3
1,1 and 2
1,1 and 1

Solution :Number of TOTAL ions present in the silution is known as van't Hoff factors (i).
`{:("SUBSTANES","van't Hoff factor (i)"),("For"KCl,""2),("For"NaCl,""2),("For"K_(2)SO_(4),""3):}`
Hence, correct choice is (b).
Discussion
8938.

Two van der waal's gases have same value of a but different value of b which of the following statement is correct ?

Answer»

The SMALLER the VALUE of b larger will be COMPRESSIBILITY
The largerthe value of b larger will be compressibility
Both have same compressibility
All the with smaller value of b will occupy larger VOLUME

Answer :A
Discussion
8939.

The standard reduction potential for Cu^(2+)//Cuis +0.34V. If ksp of Cu(OH)_2 is 1.0 xx 10^(-19), the reduction potential at pH =14 for the above couple is

Answer»

+0.22 V
-0.80 V
+0.80 V
-0.22V

Answer :D
Discussion
8940.

When chromite ore (FeCr_2O_4) is heated with sodium carbonate in free access of air

Answer»

No GASEOUS PRODUCT is formed
Iron (II) oxide is obtained
A water INSOLUBLE product which is dark BROWN in colour is formed
A water SOLUBLE product which is red in colour is obtained

Answer :C
Discussion
8941.

When the ph of a solution is 2 the hydrogen ion concentration is :

Answer»

`1.0xx10^(-14)` M
`1.0xx10^(-2)` M
`1.0xx10^(-7)` M
`1.0xx10^(-12)` M

Answer :B
Discussion
8942.

Which pairs of atomic numbers represent elements which belong to s block elements.

Answer»

3,15
6,12
9,17
3,12

Answer :D
Discussion
8943.

Which of the following mixtures will act as buffer solution(s)? (1) 50 mL 0.1(M) NH_(3)+100mL" "0.025(M) HCl (2) 100mL 0.05(M) CH_(3)COOH+50mL0.1(M)NaOH.

Answer»

SOLUTION :(1) Will ACT as a BUFFER solution.
Discussion
8944.

Which of the following is an amphoteric oxide?

Answer»

`N_2O_5`
`P_4O_6`
`As_4O_6`
`Sb_4O_6`

ANSWER :D
Discussion
8945.

What is the use of brown amorphous substance obtained, when Sucrose is heated to 483 K ?

Answer»

As ARTIFICIAL SWEETENING agent.
As ANTIOXIDANTS.
As FOOD colours.
As food preservatives.

Solution :As food colours.
Discussion
8946.

Whichof the followingrotates the planepolarisedlightin clockwisedirection ?

Answer»

L(-) Glucose
D(glucose)
L - fructose
L - GLYCERALDEHYDE

ANSWER :B
Discussion
8947.

Which metal occurs in free state:

Answer»

Ag
Au
Pt
All

Answer :D
Discussion
8948.

Which solvent is used for cellulose ?

Answer»

ORGANIC SOLVENTS
Water
Ammonical cupric HYDROXIDE
None of these

SOLUTION :Ammonical cupric hydroxide
Discussion
8949.

Which of the following pairs of cations ca be separated by adding NH_(4)Cl,NH_(4)OH and then (NH_(4))_(2)CO_(3) to the mixture?

Answer»

`CA^(2+),Mg^(2+)`
`BA^(2+),SR^(2+)`
`Sr^(2+),Ca^(2+)`
`Ba^(2+),Ca^(2+)`

ANSWER :A
Discussion
8950.

Using the Ellingham diagram given below. Predict the conditions under which Magnesium could reduce alumina

Answer»

Solution :Ellingham DIAGRAM SUGGESTS that below `1350^(@)C`, Mg can reduce aluminium oxide `Al_(2)O_(3)`, and when temperature is above `1350^(@)C`, Al can reduce MAGNESIUM oxide MGO.
Discussion