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10801.

Which group show –M effect ?

Answer»



`-CH_3`
`-SO_(3)H`

SOLUTION :`-underset(O)underset(||)overset(O)overset(||)S-O-H` (-M EFFECT )
Discussion
10802.

Which of the following can possible by used as analgesic without causing addiction and any modification

Answer»

Diazepam
N-acetylparaaminophenol
Morphine
Tetra hydrocatenol

Solution :N- ACETYL p-amino (paracetamol) can be used as ANALGESIC without addition and MODIFICATION.
Discussion
10803.

Which cleansing agent gets precipitated in hard water?

Answer»

SODIUM lauryl SULPHATE
Sodium stearate
Cetyl TRIMETHYL AMMONIUM bromide
Sodium dodecyl BENZENE sulphonate

Solution :
Discussion
10804.

Which of the following is secondary air pollutant?

Answer»

PHOTOCHEMICAL SMOG
`NO_2`
DUST PARTICLES
`SO_2`

ANSWER :D
Discussion
10805.

What mass of iodine is liberated from a solution of potassium iodide when 1 litre of chlorine gas at 10^(@)C and 750 mm pressure is passed through it?

Answer»


Solution :`2KI+underset("22.4 L at sTP")(Cl_(2))rarr2KCl+underset(254g)(I_(2))`
First CONVERT the given volume to volume at S.T.P.
Discussion
10806.

The thermal decomposition of a compound is of first order. If 50% of a sample of the compound is decomposed in 120 minutes, how long it take for 90% of the compounds to decompose.

Answer»

About240minutes
About 480minutes
About 45MINUTES
About400minutes

Solution :`100 OVERSET(120) to 50 overset(120) to25 overset(120 ) to12.5 overset(120 ) 6.25`
therefore , 10 %liesbetween12.5and 6.25henceapproximately400mintues .
Discussion
10807.

Which is not the characteristics of amino acids ?

Answer»

Water SOLUBLE
Amorphous SOLID
High melting points
Salt LIKE BEHAVIOUR

SOLUTION :Amorphous solids
Discussion
10808.

Which metal has highest density ?

Answer»

PT
HG
OS
IR

Answer :C
Discussion
10809.

What fraction of a mole of iron metal will be produced by passage of 4 amp of current through 1 litre of 0.1 M Fe^(2+)solution for 1 hour?

Answer»

SOLUTION :0.025 MOLE
Discussion
10810.

Which of the following aldehydes does not reduce Fehiling solution readily ?

Answer»

ACETALDEHYDE
Formaldehyde
Propanal
BENZALDEHYDE

ANSWER :D
Discussion
10811.

Which has maximum boiling point :-

Answer»

Ne
Ar
XE
He

Solution :As PERE SURFACE AREA
Discussion
10812.

Which of the following metal pairs can be purified by Van-arkel method ?

Answer»

ZR and TI 
Ga and In 
Ni and FE 
AG and Au 

Answer :A
Discussion
10813.

Which of the following chemical changes can occur with the greatest ease?

Answer»

`N to N^(-)`
`N^(-) to N^(2-)`
`N^(2-)to N^(2-)`
`O to O^(-)`

Solution :Though adding an electron to N–2 will also MAKE it attain noble GAS configuration but adding a THIRD electron to the same atom WITHOUT adding any protons is very difficult as the incoming third electron will be HIGHLY repelled by the already present electrons. Converting O towill be easy.
Discussion
10814.

Which of the followi9ng pairof acidredicals can bedistinguished by using dil H_(2)SO_(4)?

Answer»

`C_(2)O_(4)^(2-)` and `NO_(3)^(Θ)`
`NO_(3)O_(4)^(Θ)` and `NO_(2)^(Θ)`
`CI^(Θ)` and `Br^(Θ)`
`HCO_(3)^(Θ)` and `CO_(3)^(2-)`

Solution :
HENCE ,distincition is possible
C. Both `CI^(Theta)`and `Br^(Theta)` have no reaction with DIL `H_(2)SO_(4)`
d.Both `HCO_(3)^(Theta)` and `CO_(3)^(2-)` produce `CO_(2) UARR` which evolved witheffecrescences
Discussion
10815.

Which of the following does not form polyhalide ?

Answer»

`Cl_(2)`
`I_(2)`
`Br_(2)`
`F_(2)`

Solution :It is because of the non-availability of d-orbitals in the valence shell of F atom. Halide ions associate with the MOLECULES of halogen (EXCEPT fluorine) or oto go inter halogens to FORM poly halide ions.
`I^(-)+I_(2) to I_(3)^(-) +Cl_(2) to Cl_(3)^(-)`
Discussion
10816.

Total number of aldehydes which give iodoform with I_2,NaOH is

Answer»


SOLUTION :`CH_3- OVERSET(O ) overset(||)C-H `is onlyaldehydegivesiodoformtest
Discussion
10817.

Which of the following will not act as oxidising agents?

Answer»

`CrO_(3)`
`MoO_(3)`
`WO_(3)`
`CrO_(4)^(2-)`

Solution :Down the group the STABILITY of the metal ions in higher OXIDATION state increases. Also oxygen stabilizes metal ion in their highest oxidation states through multiple bonds.
Discussion
10818.

Which of the following hydroxide of alkaline earth metals is least basic ?

Answer»

`Be(OH)_(2)`
`BA(OH)_(2)`
`MG(OH)_(2)`
`Ca(OH)_(2)`

SOLUTION :`Be(OH)_(2)` is least BASIC.
Discussion
10819.

Which Fisher projection represents the given wedge dash structure :

Answer»




ANSWER :A
Discussion
10820.

Whatistherole ofgraphiteintheelectrometallurgyofaluminium ?

Answer»

Solution :Intheelectrometallurgyofaluminum, afusedmixtureofalumina,cryoliteandflourspar (`Ca F_2`) iselectrolysedusinggraphiteas anodeandgraphite linedironas cathode. DURINGELECTROLYSIS, Al isliberatedatthecathodewhileCOand` CO_ 2`are liberatedattheanode.
At cathode:` Al^( 3 +) ("melt" )toAl(l) `
At anode:`C (s)+O ^(2 - )(" melt" )toCO (g)+2 E ^(-) `
` C(s)+2O ^( 2 -) ("melt ") toCO_ 2(g) +4 e ^( - ) `
Ifinsteadofgraphite, somemetalisusedas theanode,then` O_2`liberatedwillnot onlyoxidisethemetalofthe electrodebut wouldalsoconvertsome of theAl libertedatthecathode backto`Al _ 2O_3`.
Sincegraphiteis muchcheaperthan anymetal,therefore , graphiteis usedasthe anode. Thus,the ROLE ofgraphiteinelectrometallurgyofAl istopreventtheliberationof ` O _ 2 `at theanodewhich mayotherwiseoxidisesome oftheliberatedAl backto` Al _2 O _3`.
Discussion
10821.

Which is first man-made element ?

Answer»

Sc
Os
TC
Zr

Answer :C
Discussion
10822.

Which is the correct statement for the given acids?

Answer»

Phosphinic acid is a MONOPROTIC acid while Posphonic acid is a DIPROTIC acid.
Phosphinic acid is a diprotic acid while Posphonic acid is a monoprotic acid.
Both are diprotic ACIDS
Both are triprotic acids

ANSWER :1
Discussion
10823.

Which of following metal is extracted by the electrolysis of its salt in molten state (a) Na,(b) Mg,(c) Al,(d) Fe,(e) Ag The correct answer is

Answer»

only a and B
Only a, b and C
Only a, b, c and e
All the above

ANSWER :B
Discussion
10824.

Toluene can be oxidised to benzoic acid by :

Answer»

ALK.`KMnO_4`
alk.`K_2Cr_2O_7`
any of these
none of these

Answer :A
Discussion
10825.

When glucose is heated with nitric acid, the product is :

Answer»

GLUCONIC acid
Glucaric acid
Glycolic acid
Oxalic acid

Answer :B
Discussion
10826.

Treatment of aniline with bromine water produces

Answer»

2, 4, 6-tribromoaniline
Mixture of ORTHO and PARA bromoaniline
Bromobenzene
N-Bromoaniline.

Solution :
Discussion
10827.

The salt having least solubility in water :-

Answer»

`BaCl_(2)`
`BA(NO_(3))_(2)`
`MgSO_(4)`
`BaSO_(4)`

SOLUTION :`BaSO_(4)` gives white ppt in water
Discussion
10828.

Whichone of the followingis correctlymatched ?

Answer»

Emlulsion -SMOKE
Gel -BUTTER
Foam - MIST
Sol - Whipped cream

ANSWER :B
Discussion
10829.

Which statement(s) is/are correct for the given reaction and compounds.

Answer»

Two ESTERS are formed.
All the esters are chiral.
Both esters are DIASTEREOMERS.
Racemic mixture is formed as a PRODUCT.

SOLUTION :The final esters have only one chiral carbon atom and these are mirror IMAGE of each other, so product mixture is racemic.
Discussion
10830.

What happens when acetaldehyde reacts with HCN ?

Answer»

SOLUTION :ACETALDEHYDE CYANOHYDRIN is FORMED.
Discussion
10831.

Which one of the following is an expression of Raoult's law if P_(A) is the partial pressure of the solvent in a solution,P_(A)^(0) is the partial pressure of the pure solvent and if x_(A) and x_(B) are the mole fraction of the solute and the solvent repectively?

Answer»

`P_(A)=P_(A)^(@) X_(A)`
`P_(A)=P_(A)^(@) X_(A)(1//X_(B))`
`P_(A)=P_(A)^(@)X_(B)`
`P_(A)^(@)=P(X_(A)//X_(B))`

Solution :by def. of raoult's law `P_(A)=P_(0)^(A) X_(B)`
(Note that `X_(B)` is the mole FRACTION of the solvent in the solution.)
Discussion
10832.

Which of the following are generally used for preparing derivatives of aldeydes and ketones ?

Answer»

HYDROCYANIC ACID
Hydroxylamine
Phenyl hydrazine
All of these

ANSWER :D
Discussion
10833.

Write the partial structure of Neoprene

Answer»

SOLUTION :
Discussion
10834.

The second most electronegative element in periodic table is

Answer»

F
O
CL
N

ANSWER :B
Discussion
10835.

Under Wolff-Kishner reduction conditions, the conversion which may be brought about is:

Answer»

a.Benzophenone to DIPHENYL methane
b.Benzaldehyde to BENZYL alcohol
C.Cyclohexanone to cyclohexane
d.Cyclohexanone to cyclohexanol

Solution :
So the ANSWER are (a) and (c).
Discussion
10836.

The vapour pressure of pure benzene is 22mm and that of pure toluene is 75mm at 20^(@)C. What is the composition of the solution of these two components that has a vapour pressure of 50mm at this temperature ? What is the composition of vapour in equilibrium with this solution ?

Answer»


ANSWER :`0.47 : 0.53 : 0.20 : 0.80`
Discussion
10837.

Which of the following is the correct order of acidic nature of oxide ?

Answer»

`Al_(2)O_(3) GT SiO_(2) gt P_(4)O_(10)`
`P_(4)O_(10) gt SiO_(2) gt Al_(2)O_(3)`
`P_(4)O_(10) gt Al_(2)O_(3) gt SiO_(2)`
`SiO_(2) gt P_(4)O_(10) gt Al_(2)O_(3)`

SOLUTION :`Al_(2)O_(3)` is an amphoteric OXIDE.
Discussion
10838.

Which of the following exhibit highest B. P. ?

Answer»




ANSWER :B
Discussion
10839.

Which of the following has magnesium?

Answer»

ChlorophyII
Haemocyanin
Carbonic anhydrase
Vitamin B_12

Answer :A
Discussion
10840.

Weakest base among the following is :

Answer»

NaOH
`CA(OH)_2`
`ZN(OH)_2`
KOH

Answer :C
Discussion
10841.

Which one is not tranquilizer ?

Answer»

BARBITURIC acid
Secronal
Luminal
PHENACETIN 

SOLUTION :Phenacetin
Discussion
10842.

Write two example of covalent solids.

Answer»

SOLUTION :SIC, `SiO_2`, GRAPHITE, AIN
Discussion
10843.

What are sugar substituents? Give two examples.

Answer»


Solution :The compounds that are used LIKE SUGARS for sweetening, but are metabolised without the influenceof insulin are called SUGAR substituents. e.g., sorbitol, xylitol, MANNITOL.
Discussion
10844.

Two faraday of electricity is passed through a solution of CuSO_(4). The mass of copper deposited at the cathode is (at. Ass of Cu=63.5 amu)

Answer»

0g
63.5g
2g
127g

Solution :`UNDERSET(2F)(Cu^(2+)+2e^(-))underset("1 MOLE")(TOCU)`
`=63.5g`
Discussion
10845.

What is the importance of amino acids to us?

Answer»

SOLUTION :Amino acids are required for proper GROWTH and development of our body. Deficiency of amino acids can cause Kwashiorkor and MARASMUS DISEASES.
Discussion
10846.

Which of the following can react with an alkyl halide ?

Answer»

`1^(@)` AMINE
`2^(@)` amine 
`3^(@)` amine
all the above

Answer :D
Discussion
10847.

Which part of the protein molecule is responsible for function and activity of the proteins?

Answer»

SECONDARY structure
Peptide BOND
PRIMARY structure
Binding sites

Answer :B
Discussion
10848.

What are alloy steels? Give three examples.

Answer»

Solution :Steel to which various elements such as Cr, Ni, Cu, MN, Mo, V and tungsten have been added to obtain DESIRED properties are CALLED alloy steels. These are high quality steels and generally manufactured in an electric furnaces.
EXAMPLES: Invar, Tungsten, Steel, Stainless Steel, Chrome Steel, VANADIUM Steel etc.
Discussion
10849.

Which of the following is not an example of green chemistry?

Answer»

Catalytic DEHYDROGENATION of the diethanol amine without USING cyanide and formaldehyde.
Replacement of CFCs by `CO_2` as blowing agent inthe manufacture of polystyrene FOAM sheets.
Reacting methylamine and phosgene to producemethyl isocyanate.
Replacement of organotins by 'sea-nine' and asfouling compound in sea marines

Solution :Reaction of methylamine and phosgene to produce METHYL isocyanate is not an example of GREEN chemistry.
Discussion
10850.

Zone refinning is used form the

Answer»

CONCENTRATION of an ORE
REDUCTION of METAL oxide
Purification of metal
Purification of an ore

Answer :C
Discussion