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8401.

Which of the following gases can be absorbed in more proportion ?

Answer»

`O_(2)`
`N_(2)`
`CO_(2)`
`H_(2)`

ANSWER :C
Discussion
8402.

Which one of the following represents specific conductance (kappa)?

Answer»

`I/C CDOT l/a`
`I/P cdot a/l`
`I/P cdot a/(l^2)`
`I/P cdot l/a`

ANSWER :D
Discussion
8403.

Which of following is not chiral :-

Answer»

2 – Butanol
2, 3 – DIBROMO pentane
3 – Bromo pentane
2 – HYDROXY pentanoic acid

Solution :(1)2-Butanol
`underset"1.C.C."(CH_3-underset(CH)underset|OVERSET**CH-CH_2-CH_3)`
(2)2,3-Dibromopentane
`underset"2.C.C."(CH_3-undersetunderset(Br)|overset**CH-undersetunderset(Br)|overset**CH-C_2H_5)`
(3)3-Bromopentane
`underset"0.C.C."(CH_3-CH_2-undersetunderset"Br"|CH-CH_2-CH_3)`
(4)2-Hydroxy pentanoic acid
`underset"1.C.C."(CH_3-CH_2-CH_2-undersetunderset(OH)|overset**CH-COOH)`
Discussion
8404.

The reagents A,B and C respectively are

Answer»

`NaBH_(4)` ,ALK.`KMNO_(4).H_(2)//PD`
`H_(2)//Pd,PCC,NaBH_(4)`
`H_(2)//Pd,alk.KMnO_(4),NaBH_(4)`
`NaBH_(4),PCC,H_(2)//Pd`

Solution :`NaBH_(4),PCC,H_(2)//Pd`
Discussion
8405.

When phosphorus reacts with caustic soda , the products are PH_(3)andNaH_(2)PO_(2). The reaction is an example of

Answer»

oxidation
reduction
disproportionation
none of these

Answer :C
Discussion
8406.

Which of the following is present in cod liver oil ?

Answer»

VITAMIN A
Vitamin C
Vitamin `B_(1)`
Vitamin `B_(12)` .

ANSWER :A
Discussion
8407.

Which of the following IUPAC names are correct?

Answer»

`K_(2)[OsCl_(5)N]`: Potassium pentachloridonitridoosmate (VI)
`[Fe(NH_(4)C_(5)-C_(5)H_(4)N)_(3)Cl_(2)`: Tis(bipyridine)iron(II)chloride
`[Fe(C_(5)H_(5))_(2):` Bis (`eta^(5)`- cyclopentadienyl)iron(II)
`[Pt(PY)_(4)][PtCl_(4)]`: Tetrapyridineplatinum(II)TETRACHLORIDOPLATINATE(II)

Solution :NA
Discussion
8408.

Which of the following is correct regarding formation of reactive inter mediate formed on heterolytic bond cleavage :

Answer»

`CH_(3)-S-CH_(3)tooverset(Theta)OVERSET(* *)(C)H_(3)+CH_(3)-overset(Theta)(S)`
`CH_(3)-Cutooverset(Theta)overset(* *)(C)H_(3)+overset(Theta)(C)u`
`CH_(3)-Cl tooverset(Theta)overset(* *)(C)H_(3)+overset(Theta)(C)l`
1 & 2 both

Answer :B
Discussion
8409.

Which one of the following reagent is used to determine the C-terminal end in a polypeptide?

Answer»

Hydrazine
2,4-dinitro phenylhydrazine
2,4-dinitrofluorobenzene
3,5-difluoronitrobenzene

SOLUTION :Hydrazine is USED to DETERMINE the C-terminal end in a POLYPEPTIDE chain.
Discussion
8410.

Which among the following is the strongest ligard?

Answer»

`NH_(3)`
CN
en
CO

Solution :CO strongest of all ACCORDING to spectrochemic SERIES
Discussion
8411.

Which of the following does not exist ? (i) XeOF_(4) (ii) NeF_(2) (iii) XeF_(4) (iv) XeF_(6)

Answer»

Solution :The sum of first and second ionization enthalpies of Ne are MUCH HIGHER than those of Xe. As a result, `F_(2)` can OXIDISE Xe to `Xe^(2+)` but cannot oxidise Ne to `Ne^(2+)`. In other WORDS, `NeF_(2)` does not EXIST. In contrast, all the xenon fluorides `(XeF_(4) and XeF_(6))` and xenon oxyfluoride `(XeOF_(4))` do exist.
Discussion
8412.

What is the effect on boiling and freezing point of a solution on addition of NaCl ?

Answer»

SOLUTION : Boiling POINT increases and FREEZING point DECREASES.
Discussion
8413.

(x)/(20)M concentration of H^(+) ion must be maintained in a saturate H_(2)S(0.1M) to precipitates CdS but not ZnZ, if [Cd^(2+)]=[Zn^(2+)]=0.1M initially. K_(sp)(CdS)=8xx10^(-27), K_(sp)(ZnS)=1xx10^(-21)K_(a)(H_(2)S)=1xx10^(-21)ZnS will not precipitate atconcentration of H^(+) greater than (x)/(20)M. The value of x is .

Answer»


ANSWER :`2.00`
Discussion
8414.

Which of the following sets contains only addition polymers?

Answer»

Polythylene , POLYPROPYLENE , terylene
Polyethlene , PVC, acrilan
Buna-S, NYLON , polybutadiene
Bakelite , PVC, polyethylene

ANSWER :B
Discussion
8415.

Which carbohydrate does not have C_(x)(H_(2)Q)_(y) general formula ?

Answer»

RHAMNOSE
STACHYOSE
FRUCTOSE
melitriose

SOLUTION :rhamnose
Discussion
8416.

Trichloroacetaldehyde, C CI_(3)CHO reacts with chlorobenzene in presence of sulphuric acid and produces

Answer»




ANSWER :D
Discussion
8417.

What is meant by positive deviations from Raoult's law ? Give an example. What is the sign of Delta_(mix)Hfor positive deviation ?

Answer»

Solution : If the vapour PRESSURE of a solution is higher than what is expected from Raoult.s law, it is called positive DEVIATION from Raoult.s law. A mixture of ETHANOL and acetone SHOWS positive deviation from Raoult.s law.Sign of `Delta_(MIX) H`for such deviation is + ve i.e., it is endothermic.
Discussion
8418.

Which one of the following will give a white precipitate with AgNO_3 in aqueous medium ?

Answer»

`[CO(NH_3)_5Cl](NO_2)_2`
`[PT(NH_3)_2Cl_2]`
`[Pt(en)Cl_2]`
`[Pt(NH_3)_4]Cl_2`

ANSWER :D
Discussion
8419.

Which of the following reagent can convert benzenediazonium chloride into benzene

Answer»

WATER
Acid
Hypophosphorous
HCl

Solution :Hypophosphorous acid is used to CONVERT benzenediazonium chloride into benzene.
Discussion
8420.

Which of the following is an incorrect statement?

Answer»

Most heterogeneous catalytic reactions involve the solid surface of the CATALYST
Heterogeneous catalyst primarily function by lowering the ACTIVATION energy of the reaction
A solid catalyst present in the POWER form is more effective as it has LARGE surface area
The catalyst may be deactivated by heating it to a high temperature in vacuum

Answer :D
Discussion
8421.

When rain is accompained by a thunder storm, the collected rainwater will have pH value

Answer»

1. slightly higher than that when the THUNDER strom is not there
2. unifluenced by the thunder storm
3. depends upon the AMOUNT of dust in air
4. slightly lesser than of RAIN water without thunder storm.

Answer :D
Discussion
8422.

Which one of the following is an example for first order reaction ?

Answer»

`2NO_((G))+O_(2_((g)))rarr2NO_(2(g))`
`CH_3CHO_((g))rarrCH_(4(g))+CO_((g))`
`SO_2Cl_(2(l))rarrSO_(2(g))+Cl_(2(g))`
`2HBrrarrH_2+Br_2`

ANSWER :C
Discussion
8423.

Which of the following two routes to allyl isopropyl ether is more efficient? Explain.

Answer»

Solution :The reaction of NaH with an alcohol (ROH) YIELDS an alkoxide (RO-). Alkoxides are generally strong BASES. If an alkoxide is reacted with a methyl or primary alkyl halide, `S_(N)2` substitution can proceed in GOOD yield. If the alkyl halide is secondary or tertiary, then elimination predominates. In this example, the second reaction (primary alkyl iodide) will give the better ratio of substitution VERSUS elimination products.
Discussion
8424.

Which among the following is a peptide linkage ?

Answer»




ANSWER :A
Discussion
8425.

Which of the following does not evolve CO_2 on treatment with dilute hydrochloric acid?

Answer»

BISMUTH CARBONATE
lead carbonate
calcium carbonate
BASIC lead carbonate

Solution :Basic lead carbonate does not evolve `CO_(2)` on treatment with dil. `HCL`
Discussion
8426.

Which of the following pairs of metals is purified by Van-Arkel method.

Answer»

Ga and In 
Zr and Ti 
AG and AU 
NI and FE 

ANSWER :B
Discussion
8427.

Which alkaline earth metal forms peroxide on burning in air ?

Answer»

Be
Ca
Sr
Ba

Answer :D
Discussion
8428.

Whichstructure represents the overall foldingof polypeptide chains ?

Answer»

SOLUTION :TERTIARY STRUCTURE
Discussion
8429.

Which of the following statement is false in relation to enzyme

Answer»

PH affects their functioning
Temperature in concentration of the REACTANT with time
They always increase activation energy
Their reactions are SPECIFIC

SOLUTION :Enzymes does not always increase activation energy .
Discussion
8430.

Which one of the following arrangements truly represent the property indicated against it?

Answer»

`Br_(2) LT Cl_(2) lt F_(2)` (bond energy)
Bromine `lt` CHLORINE `gt` Fluorine (electronegativity)
`Br_(2) lt Cl_(2) lt F_(2)` (oxidising POWER)
Both (B) and ( C)

Answer :D
Discussion
8431.

What is the pH after addition of 40 mL of 0.1 M NaOH in the titration of 50 mL of 0.1 M anilinium chloride ? (K_(a) for anilinicum ion =2.5xx10^(-5))

Answer»

3
4
5
6

Answer :B
Discussion
8432.

Which of the following is most reactive towards hydrolysis:-

Answer»

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

SOLUTION :BENZYL CARBOCATION is most reactive of the carbocations.
Discussion
8433.

Write the cell reaction for the electrochemical cell represented as Zn(s)|Zn^(2+)(aq)||Cu^(2+)(aq)|Cu(s)

Answer»

SOLUTION :The OVERALL cell reaction is `Zn(s)+CU^(2+)(aq)TOZN^(2+)(aq)+Cu(s)`
Discussion
8434.

Upon heating KClO_(3) in the presence of catalytic amount of MnO_(2), a gas W is formed. Excess amount of W reacts with white phosphates to give X. The reaction of X with pure HNO_(3) gives Y and Z W and X are, respectively

Answer»

`O_(2)` and `P_(4)O_(10)`
`O_(2)` and `P_(4)O_(6)`
`O_(3)` and `P_(4)O_(6)`
`O_(3)` and `P_(4)O_(10)`

SOLUTION :`KClO_(3) overset(Delta)underset(MnO_(2))to KCL + O_(2)`
`underset("(WHITE)")(P_(4))+ underset("(EXCESS)")(O_(2))to underset("(X)")(P_(4)O_(10))`
`P_(4)O_(10) + HNO_(3) to underset("(Y)")(N_(2)O_(5)) + underset("(Z)")(HPO_(3))`
Discussion
8435.

What will be reactivity order for isocyanide test for following amines?

Answer»

`P gt R gt Q gt S`
`P gt S gt Q gt R`
`P gt Q gt R gt S`
`Q gt R gt S gt P`

SOLUTION :
Rate `prop` tendency t donate LONE PAIR from `-NH_(2)`
Discussion
8436.

Which of the following is a Lewis acid

Answer»

`PCl_(3)`
`AlCl_(3)`
`NCl_(3)`
`AsCl_(3)`

Solution :`AlCl_(3)` is electron deficientmolecules. It act as `e^(-)` pair ACCEPTOR (LEWIS acid)
Discussion
8437.

The reagent with which both acetaldehyde and acetone react is

Answer»

FEHLING's solution
`I_(2)//NAOH`
TOLLENS' reagent
Carbonic acid

Solution :`CH_(3)-OVERSET(O)overset(||)C-H` and `CH_(3)-overset(O)overset(||)C-CH_(3)` due to
presence of `CH_(3)-overset(O)overset(||)C-group` reacts with iodine in NaOH to form yellow ppt. of iodoform.
Discussion
8438.

Which of the following is the weakest Bronsted base?

Answer»




`CH_(3)NH_(2)`

Solution :Due to delocalisation of a lone PAIR of electrons present on the N-atom into the benzene RING, `C_(6)H_(5)NH_(2)` is the weakest BASE.
Discussion
8439.

Which of the following is used to estimate acidic H in any organic copmpound ?

Answer»

Bielstien's METHOD
Zerewittinoff's method
Zeisel method
DUMA's method

SOLUTION :N//A
Discussion
8440.

What are hormones ? Give its classification.

Answer»

SOLUTION :Hormones are molecules that ACT as intercellular messengers. They are secreted by endocrine glands in the body and are poured directly into the blood STREAM and are transported to the site of action.
Classification : Chemically, hormones are classified as steroid HORMONE, peptide hormone and amine hormone. For example, ESTROGENS and androgens are steroid hormones, insulin, endorphins etc. are peptide hormones and epinephrine and norepinephrine are amine hormones.
Discussion
8441.

The rms speed of hydrogen in sqrt7 times the rms speed of N_2. If T is the temperature of the gas :

Answer»

`T(H_2) = T(N_2)`
`T(H_2) GT T(N_2)`
`T(H_2) LT T(N_2)`
`T(H_2) = sqrt7T(N_2)`

ANSWER :C
Discussion
8442.

Which on heating will give mixture of SO_2 and SO_3

Answer»

`ZnSO_4`
`CuSO_4`
`Fe_2(SO_4)_3`
`FeSO_4`

ANSWER :D
Discussion
8443.

What is the percentage of noble gases in the atmospheric air ?

Answer»

SOLUTION :`1%` by VOLUME.
Discussion
8444.

Thiophene and benzene are separated by

Answer»

SULPHONATION of thiophene
Sulphonation of benzene
Nitration of thiophene
Nitration of benzene

Answer :B
Discussion
8445.

Which is not true about ligand- metal complex:

Answer»

Larger the ligand, the more stable is the meta­l-ligand complex
Highly charged ligand FORMS stronger bonds
Larger the PERMANENT DIPOLE MOMENT of a neutral ligand, the more stable is the bond
Greater the electronegativityof the central METAL, the stronger the bond

Answer :A
Discussion
8446.

White phosphorous is colourless but becomes pale yellow due to formation of a …………….upon standing.

Answer»

SOLUTION :LAYER of RED PHOSPHOROUS
Discussion
8447.

What is not true for enzymes :

Answer»

They are POWERFUL biocatalysts
They are all proteins
They are HIGHLY SPECIFIC in their action
They do not LOSE ACTIVITY on heating

Answer :D
Discussion
8448.

Which of the following names are not correct for the given compound? underset(CHO)underset(|)(CH_(2))-underset(CHO)underset(|)(CH)-underset(CHO)underset(|)(CH_(2))

Answer»

3-Formylpentane-1,5-dial
1,2,3-Triformyl-propane
2-Formylbutane-1,4-dial
Propane-1,2,3-tircarbaldehyde

Answer :B,C
Discussion
8449.

Two electrolytic cells, one containing acidified ferrous chloride and another acidified ferric chloride are connected in series. The ratio of iron deposited at cathodes in the two cells when electricityis passed through the cell will be:

Answer»

`3:1`
`2:1`
`1:1`
`3:2`

ANSWER :D
Discussion
8450.

Which of the following would be an acidic solution?

Answer»

Solution having hydrogen ion concentration of `10^(-7)`M
Solution having hydrogen ion concentration of `10^(-13)` M
Solution having hydrogen ion concentration of `10^(-2)`M
Solution having hydrogen ion concentration of `10^(-12)` M

Solution :when`H^(+)gt 10^(-7) `M the slutionis ACIDIC`pH LT 7`thereforethesolutionhavingconcentrationof`10^(-2)`M (pH ` =2`) is acidic
Discussion