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4501.

Which of the following is a strong oxidising agent ?

Answer»

`KmnO_(4)//H_(2)SO_(4)`
`Na_(2)Cr_(2)O_(7)//H_(2)SO_(4)`
`KMnO_(4)//KOH`
All of these

Solution :All of these
Discussion
4502.

Three molesof CH_(3)lare madeto reactwith one moleof ammonia . The productformedis

Answer»

`1^(0)` amine
`2^(0)` amine
`3^(0)` amine
quaternaryammonium salt

Answer :C
Discussion
4503.

Which of the following is true about vitamains ?

Answer»

Vitamins are secreted by DUCTLES glands.
Vitamins are synthesised in an human body
Vitamins of the B group and VITAMIN C are water SOLUBLE while vitamins A,D,E and K are fat soluble.
Vitamins in the body are NEEDED in very large amounts.

Answer :C
Discussion
4504.

Which of the following is used in preventation of hert attak?

Answer»

Ibuprogen PHENOL
phenol
DETTOL
SECONAL

ANSWER :D
Discussion
4505.

Which are true for terpolymer:

Answer»

CONTAINS THREE DIFFERENT monomers
ABS plastic
A POLYMER of ACRYLONITRILE,butadiene
and styrene
All

Answer :D
Discussion
4506.

Whichis the correct statement the given acids

Answer»

Phosphinic acid is a diprotic acid while phosphonic acid is a MONOPROTIC acid
Phosphinic acid is a monoprotic acid while phosphonic acid is a diprotic acid
Both are triprotic acid
Both are diprotic acid

Solution :Phosphinic acid `(H_(3)PO_(2))`
Discussion
4507.

Which of the following will have three stereoisomeric forms :- (i) [Cr(NO_(3))_(3)(NH_(3))_(3)](ii) K_(3)[Co(C_(2)O_(4))_(3)] (iii) K_(3)[CoCl_(2)(C_(2)O_(4)_(2)](iv) [Co BrCl(en)_(2)]

Answer»

III, IV
I, II and iv
Only iv
All

Answer :A
Discussion
4508.

Which of the following is pseudo first order reaction?

Answer»

`2H_2O_2 to 2H_2O + O_2`
`2O_3 to 3O_2`
`CH_3COOC_2H_5 + NAOH to CH_3COONa+ C_2H_5OH`
`CH_3COOC_2H_5 +H_2O OVERSET(H^+)to CH_3COOH + C_2H_5OH`

ANSWER :D
Discussion
4509.

Which is the monomer of polypeptide

Answer»

Propene
BUTADIENE
ADIPIC acid
AMINO acid

ANSWER :D
Discussion
4510.

Which of the following plots correctly represents variation of equivalentconductance(wedge_(eq))withdilution for a strongelectrolyte ?

Answer»




SOLUTION :EQUIVALENT CONDUCTANCE INCREASES with dilutionand ultimatelybecomes CONSTANT .
Discussion
4511.

Which of the following will not be soluble in sodium carbonate solution.

Answer»




Solution :ACIDIC nature of o-nitrophenol is LESS than `H_(2)CO_(3)`. So it does not react with `Na_(2)CO_(3)` solution.
Discussion
4512.

Which of the following expressions is correct for an ideal gas?

Answer»

`P=2/3V/(N_(A))barE`
`P=3/2 V/(N_(A))barE`
`P=2/3 (N_(A))/V barE`
`P=3/2 (N_(A))/V barE`

Solution :We KNOW average KINETIC energy `barE=3/2 R/(N_(A))T`
but `PV=RT`
`:.barE=3/2(PV)/(N_(A))impliesP=2/3(N_(A))/VbarE`
Discussion
4513.

Which of the following statement/statements is/re correct?

Answer»

in the `NACL` structures, each `Na^(+)` ion is surrounded by `6Cl^(-)` ions as nearest neighbours and twelve `Na^(+)` ions as NEXT nearest neighbours.
the co-ordination NUMBER of CATION generally increases as the radius ratio increases
packing efficiencies higher than `0.74` are possible only with cation and anion of different sizes
during a crystal defect electrical neutrality should be maintained.

Solution :abcd FACTS
Discussion
4514.

What is added during preparation of shaving soap due to this soap and its foam do not dry up rapidly?

Answer»

GLYCEROL 
CAROTENE 
ALCOHOL 
CARBOXILIC acid

Solution :Glycerol
Discussion
4515.

Which of the following drug is an analgesic?

Answer»

iodex
valium
ANALGIN
quinine

Solution :analgin
Discussion
4516.

Which of the following lanthanoid ions is diamagnetic ?

Answer»

`EU^(2+)`
`Yb^(2+)`
`Ce^(2+)`
`Sm^(2+)`

ANSWER :B
Discussion
4517.

Which of the following metal carbonyl C-O bond length is minimum ?

Answer»

`[V(CO)_(6)]^(-)`
`[Mn(CO)_(6)]^(+)`
`[Cr(CO)_(6)]`
`[Ti(CO)_(6)]^(2-)`

Solution :As charge on C.A.`DARR`,C-Obond strength `uarr`, or C-O BOND order `uarr`, or C-O bond length `darr`
Discussion
4518.

Which of the following reactions involve carbanion enolalte as reactive intermediate?

Answer»

Kolbe-Schmidt REACTION
Reimer-Tiemann reaction
Claisen CONDENSATION
ALDOL condensation

ANSWER :C::D
Discussion
4519.

Which of the following statements about the peptide bond is (are) correct?

Answer»

The `C-N` bond of the peptide linkage is longer than that of an amide.
The `-overset(O) overset(||)(C)-NH-` portion of the peptide linkage is planar
The `C-N` bond LENGTH of peptide is SHORTER than that of an amine
The rotation about `CO-N` bond of peptide is restricted.

Solution :NA
Discussion
4520.

Write one chemical reaction to show that conc. H_(2)SO_(4) can act as an oxidising agent.

Answer»

Solution :HOT concentrated sulphuric acid OXIDISES carbon to `CO_(2)`.
`C + 2H_(2)SO_(4) (conc.) overset(Delta)RARR CO_(2)+2SO_(2) + 2H_(2)O`
Discussion
4521.

Which is a stronger reducing agent among Cr^(2+) and Fe^(2+) ? Why ?

Answer»

Solution :`Cr^(2+)` is stronger reducing agent than `FE^(2+)` , because `d^4 rarr d^3` OCCURS in CASE of `Cr^(2+) " to " Cr^(3+)` but `d^6 rarr d^5` occurs in case of `Fe^(2+)` to `Fe^(3+)` In AQUEOUS solution, `d^3` is more stable as COMPARED to `d^5`
Discussion
4522.

Which of the following is opticallyactive -

Answer»




ANSWER :D
Discussion
4523.

When a hydrophilic sol like gelatin is subjected to electric field, the sol particle moves

Answer»

Towards ANODE when `PH gt` isoelectric point
In both directions at isoelectric pH
Towards cathode when `pH lt` isoelectric point
All of these

Answer :A::C
Discussion
4524.

underset(H_(2)SO_(4))overset(K_(2)Cr_(2)O_(7))to (CH_(3))_(2)C=Ooverset(O)toCH_(3) COOH ,Here [A] is :

Answer»

ISOPROPYL alxohol
Ethyl alcohol
Tert BUTYL alcohol
Propyl alcohol

Answer :A
Discussion
4525.

Which one of the produet is formed when benzene and propene is heated at 523 K?

Answer»

CUMENE
2-ETHYL BENZENE
2-propyl benzene
Ethyl enthanoate

SOLUTION :Cumene
Discussion
4526.

Which of the following elements of group 15 in a typical metal ?

Answer»

P
As
Sb
Bi

Answer :D
Discussion
4527.

When a strong acid is titrated using a weak base, the pH at the equivalence point is

Answer»

7
`GT 7`
`LT 7`
`~~7`

ANSWER :C
Discussion
4528.

What is the nuber of sigmaa and pi bonds present in H_2SO_(4) molecule ?

Answer»

`6 SIGMA and 2 pi`
`6sigma and 0 sigma`
`2 sigma and 4 pi`
`2 sigma and 2 pi`

Answer :A
Discussion
4529.

When lambda_(c) decreases linearly with increase in sqrt(C), then it is

Answer»

an insulator
a SEMICONDUCTOR
a WEAK electrolyte
a STRONG electrolyte

Answer :D
Discussion
4530.

Writethestrutureof allthealkanes that can behydrogenatedto from2- methpyloentane .

Answer»

SOLUTION :The STRUCTURE of 2- methylpence is
`CH_(3)-overset(CH_(3))overset(|)CH-CH_(2)-CH_(2)-CH_(2)`
there can be four different POSITIONS for a duablebond , hence, fourdefferentalkanes are :
`CH_(3)-overset(CH_(3))overset(|)CH-underset((i))CH_(2)-CH_(2)=CH_(2),"" CH_(3)-overset(CH_(3))overset(|)CH-underset((ii))CH=CH-CH_(3),`
`CH_(3)-overset(CH_(3))overset(|)CH-underset((iii))CH-CH_(2)=CH_(3),"" CH_(3)-overset(CH_(3))overset(|)C-underset((iv))CH_(2)-CH_(2)-CH_(3),`
Discussion
4531.

Which of the following is neoprene rubber

Answer»

`[-CH_2-OVERSET(CN)overset(|)C=CH-]_n`
`[-CH_2-overset(OH)overset(|)C=CH-]_n`
`[-CH_2=overset(CL)overset(|)C-CH_2-CH_2-]_n`
`[-CH_2-overset(Cl)overset(|)C=CH-CH_2-]_n`

Answer :D
Discussion
4532.

Which of the following compound possess antiseptic properties ?

Answer»

DICHLORO methane
Triflouro methane
Tri IODO methane
Tetrachloro methane

ANSWER :C
Discussion
4533.

Which of the following has highest Pka value ?

Answer»

`C_(6)H_(5) - COOH`
`CH_(3) - OH`
`C_(6)H_(5) - OH`
`CH_(3) - COOH`

Answer :B
Discussion
4534.

Which of the following is not used in the preparation of ketone ?

Answer»

OXIDATION of secondary alcohols
DEHYDROGENATION fo `2^(0)` alcohol
Pyrolysis of CALCIUM acetate
Acid hydrolysis of ALKYL CYANIDE

Answer :D
Discussion
4535.

Which one of following octahedral complexes will not show geometrical isomerism ?

Answer»

`M[A_(2)B_(2)]`
`M[A_(3)B_(3)]`
`[MA_(4)B_(2)]`
`[MA_(5)B]`

Solution :The COMLEX `[MA_(5)B]` cannot show geometrical isomerism.
Discussion
4536.

Which are not the essential constituents of balanced diet:

Answer»

Carbohydrates
Fats
Proteins
Hormones

Answer :D
Discussion
4537.

Which one of the following is an inner orbital complex as well as diamagnetic in behaviour ?

Answer»

`[ZN(NH_(3))_(6)]^(2+)`
`[Cr(NH_(3))_(6)]^(3+)`
`[CO(NH_(3))_(6)]^(3+)`
`[Ni(NH_(3))_(6)]^(2+)` .

ANSWER :C
Discussion
4538.

There is foul small in presence of moisare with

Answer»

`AICI_(3)`
`AI_(2)(SO_(4))_(3)`
`FeS`
`FeSO_(4)`

ANSWER :c
Discussion
4539.

Which of the following aryl halides will react fastest with aq. NaOH at high temperature asnd high presure ?

Answer»




ANSWER :B
Discussion
4540.

What effect will the resonance have on the dipole moment of vinyl chloride?

Answer»

SOLUTION :`CH_(2)=CH-CL to barCH_(2)-CH_(2)= OVERSET(+)Cl`
It will increase its dipole MOMENT.
Discussion
4541.

Write the chemical equations involved in the leaching of bauxite ore to prepare pure alumina.

Answer»

Solution :(i) `Al_(2)O_(3)(s)+2NaOH(AQ)+33H_(2)O(l)to2Na[Al(OH)_(4)]`
(II) `2NA[Al(OH)_(4)](aq)+CO_(2)(g)to Al_(2)O_(3)xH_(2)O(s)+2NaHCO_(3)`
(iii) `Al_(2)O_(3)xH_(2)O(s) overset(1470K)to Al_(2)O_(3)(s)+xH_(2)O(g)`
Discussion
4542.

Which one of the following oxides dissolves in water ?

Answer»

CuO
`Al_(2)O_(3)`
`Fe_(2)O_(3)`
`Na_(2)O`

Solution :The atoms and MOLECULES in gases are much more spread out than in solids or liquids . They vibrate and MOVE freely at HIGH speeds . A gas will fill any container , but if the container is not sealed , the gas will escape . Gas can be compressed much more easily than a liquid or solid.
Discussion
4543.

Which of the following complex compounds does not exhibits cis-trans isomerism ?

Answer»

`[PtCl_(2)(NH_(3))_(2)]` <BR>`[PdCl_(2)BrI]`
`[Pt(NH_(3))_(2) (Cl) (Br)]`
`[Pt(NH_(3))_(3)(Cl)]^(+)`

SOLUTION :(i) `[PtCl_(2)(NH_(3))_(2)] - Ma_(2)b_(2)`
(ii) `[PdCl_(2)brI] - Ma_(2)bc`
(III) `[Pt(NH_(3))_(2)CLBR] - Ma_(2)bc`
(iv) `[Pt(NH_(3))_(3)Cl] - Ma_(3)b` G.I. absent
Discussion
4544.

Which is incorrect for paper chromatography

Answer»

it is a PART of PARTITION chromatography
It is a stationary phase
`R_(f)` value decrease when RATE of adsorption increase
None of these

Answer :B
Discussion
4545.

What type of pi-bonding is present in the compound of type POX_(3) ?

Answer»

SOLUTION : `Ppi-dpi`
Discussion
4546.

Which of the following is not found in native state ?

Answer»

PT
Cu
Au
Na

Answer :D
Discussion
4547.

Which one of the following elements shows variable equivalent mass ?

Answer»

Zinc
Silver
Calcium
IRON

Solution :Iron SHOWS the VARIABLE EQUIVALENT MASS.
Discussion
4548.

Which branched chain isomer of the hydrocarbon with molecular mass 72 u gives only one isomer of monosubstituted alkyl halide ?

Answer»

Tertiary butyl chloride
Neopentane
Isohexane
Neohexane

Solution :`H_(3)C-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C )-CH_(3) underset("monohalogenation")overset(Cl_(2)//HV)rarr` single product.
Discussion
4549.

When amylases catalyse the hydrolysis of starch , the final product obtained is chiefly

Answer»

Cellobiose
Glucose
Maltose
Sucrose

Solution :STARCH `OVERSET("AMYLASE")to` Maltose
Discussion
4550.

What is the role of activated charcoal in gas masks used in coal mines ?

Answer»

Solution :In a coal MINES, various POISONOUS gases are present. The ACTIVATED charcoal in a gas MASKS act as an adsorbent for these gases.
Discussion