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12301.

What is the effect of temperature chemisorption?

Answer»

SOLUTION :It FIRST INCREASES then DECREASES.
Discussion
12302.

Which of the following electrolyteswill have maximum coagulating value for AgI//Ag^(+) sol ?

Answer»

`Na_2S`
`Na_3PO_4`
`Na_2SO_4`
NaCl

Solution :The COAGULATION value decreases with increase in CHARGE of the Coagulation ion.
Coagulating power
`prop1/("coagulation value")prop` charge
As `AI//Ag^+` is a positive sol so negative ion will coause the coagulation .
Ions of the given ELECTROLYTES are, `S^(-2),PO_4^(3-),SO_4^(2-) and Cl^(-)`
As `Cl^(-)` has MINIMUM charge thus has maximum coagulating value.
Discussion
12303.

What are biodegradable and non-biodegradable detergents ? Give one example of each class.

Answer»

Solution :Biodegradable detergents are those detergents which are degraded by microorganisms and do not cause ENVIRONMENTAL problem. Examples of biodegradable detergents are given below :
`underset("Sodium lauryl sulphonate")(CH_(3)(CH_(2))_(10)CH_(2)OSO_(3)^(-)Na^(+))`

It may be noted that biodegradable detergents have linear alkyl chains which are easily decomposed by bacteria.
Non-biodegradable detergents are those which are not degraded (decomposed) by micro- organisms. Such detergents cause environmental problem. It is observed that such detergents CONTAIN branched chain which is not attacked by bacteria. Example of non-biodegradable detergent is given below :
Discussion
12304.

The Zieglar-Natta catalyst is used in the preparation of

Answer»

LDPE
PHBV
PAN
HDPE

Answer :D
Discussion
12305.

Which of the following alcohol will be most reactive towards lucas Reagent ?

Answer»

METHYL alcohol
Primary alcohol
Secondary alcohol
Tertiary alcohol

Answer :D
Discussion
12306.

What minimum number of atoms lions should be present in a sample of H-like species, so that a maximum of 6 spectral lines can be produced of electronic transition from fifth excited state upto n=2 ?

Answer»


ANSWER :2
Discussion
12307.

which metal adsobs hydrogen ?

Answer»

Pd
K
Al
Zn

Answer :A
Discussion
12308.

Which shows the maximum magnetic moment?V^(3+)Cr^(3+)Fe^(3+)Co^(2+)

Answer»

`V^(3+)`
`CR^(3+)`
`Fe^(3+)`
`Co^(3+)`

ANSWER :C
Discussion
12309.

The ultimate product of oxidation of most of hydrogen and carbon in foodstuffs are

Answer»

`H_(2)O` alone
`CO_(2)` alone
`H_(2)O` and `CO_(2)`
NONE of these

SOLUTION :`underset("(C and H)")("Food stuffs")+O_(2) to CO_(2) + H_2O`
Discussion
12310.

Vapour pressure of a solution containing 6.0 gm of a non-volatile solute in 180 gm water at 25^(@)C is 20 torr. If 1 "mole" of water is further added, the vapour pressure at 25^(@)C increases by 0.02 torr. Identify the correct information :

Answer»

The MOLAR mass of solute is `54 gm//"mol"`.
The vapour pressure of PURE water at `25^(@)C` its `(182)/(9)` torr.
The molariy of SOLUTION taken initially was `(1)/(1.62) m`
The molarity of FINAL solution is `(1)/(1.782) m`.

Answer :A::B::C::D
Discussion
12311.

Which a"dien" is bonded with a metal it produces:

Answer»

2 FIVE MEMBERED RINGS
2 six membered rings
1 five membered ring
3 five membered rings

Solution :2 Rings (5 membered)
Discussion
12312.

Which is naturally occurring polymer ?

Answer»

TERYLENE
NYLON -6
CELLULOSE
Nylon-66

Answer :C
Discussion
12313.

Which of the following colloid is used as a medicine for stomach troubles?

Answer»

COLLOIDAL Au
colloidal CA
MILK of MAGNESIA
SILVER sol

Solution :milk of magnesia
Discussion
12314.

Which of the following statements regarding structure is not correct

Answer»

ONF is isoelectronic with `O_(2)N^(-)`
`OF_(2)` is an OXIDE of fluorine
`Cl_(2)O_(7)` is an ANHYDRIDE of perchloric acid
`O_(3)` MOLECULE is bent

Answer :B
Discussion
12315.

Which of the following will not answer Carbylaminereaction?

Answer»

ETHYL amine
methyl amine
Aniline
DIMETHYLAMINE

SOLUTION :CARBYL amine reactionis charactersisticreactionof primaryamine . Dimethylamineissecondaryamine , DOESNOT give Carbylaminereaction.
Discussion
12316.

What is the role of desorption in the process of catalysis.

Answer»

SOLUTION :During the exclusion process the FUNCTION of the catalyst is to reduce the SURFACE and quickly MOVE to the incoming reactant. So that the process can be faster.
Discussion
12317.

What is coagulation? Mention the method used to coagulate a colloid.

Answer»

Solution :(i) The flocculation and setting down of the sol particles is called coagulation.
(ii) Various methods of coagulation are (a) ADDITION of an ELECTROLYTE (B) Electrophoresis (C) mixing oppositely changed sols (d) BOILING
Discussion
12318.

When conc. H_(2)SO_(4) comes in contact with sugar, it becomes black due to

Answer»

HYDRATION
Declourisation
Dehydration
Hydrolysis

SOLUTION :`C_(12)O_(22)O_(11)+H_(2)SO_(4) to 12C+11H_(2)O`. Process is KNOWN as dehydration.
Discussion
12319.

The synthesis of 3-octyne is achieved by adding a bromoalkane into a mixture of sodium amide and an alkyne. The bromoalkane and alkyne, respectively, are

Answer»

`BrCH_(2)CH_(2)CH_(2)CH_(3) and CH_(3)CH_(2)C-=CH`
`BrCH_(2)CH_(2)CH_(3) and CH_(3)CH_(2)CH_(2)C-=CH`
`BrCH_(2)CH_(2)CH_(2)CH_(2)CH_(3) and CH_(3)C-=CH`
`BrCH_(2)CH_(2)CH_(2)CH_(3) and CH_(3)CH_(2)C-=CH`

ANSWER :D
Discussion
12320.

The solution A has a higher osmotic pressure than the solution B :

Answer»

Solution A is hypertonic to solution B.
Solution A is HYPOTONIC to solution B.
Solution A is isotonic to solution B.
Solution B is hypertonic to solution A

Answer :A
Discussion
12321.

Whichof thefollowinggroupissharporthoandpara directive ?

Answer»

<P> `- C _ 6H _5 `
` - OH `
`CH_3 `
` -Cl `

Solution :Allthegroupsareo -andp - DIRECTIVE. BUTIN -OH group, lonpair ofelectrondensityforelectrophileato-and p -positions.Thus,itissharp o-andp- directive.
Discussion
12322.

Which of the following statements about alpha-amino acids are true ?

Answer»

In `alpha` -amino acids , the acidic GROUP is `-OVERSET(+)NH_(3)` while the basic group is `-COO^(-)`
All the `alpha`-amino acids which CONSTITUTE proteins have D-configuration
The ISOELECTRIC point of GLYCINE is 6.1
Valine is an essential amino acid

Answer :A,C,D
Discussion
12323.

When conc. H_2SO_4 is distilled with P_4O_10 the product formed is:

Answer»

`SO_2`
`S_2O_4`
`SO_3`
`S_2O_3`

ANSWER :C
Discussion
12324.

The solubility of Ag_(2)CO_(3) in water at 25^(@)is 1xx10^(-4) mole /litre. What is its solubility in 0.01 M Na_(2)CO_(3) solution? Assume no hydrolysis of CO_(3)^(2-) ion.

Answer»

`6XX10^(-6)` mole/litre
`4XX10^(-5)` mole/litre
`10^(-5)` mole/litre
`2xx10^(-5)` mole/litre

Answer :C
Discussion
12325.

Which of the followingis tranquilizer ?

Answer»

Chlordiazerpoxide
Meprobamate
Equanil
All of these

SOLUTION :N/A
Discussion
12326.

Which of the following reactions is an example of heterogeneous catalysis

Answer»

`2CO_((G))+O_(2(g))OVERSET(NO(g))rarr2CO_(2(g))`
`2SO_(2(g))+O_(2(g))overset(NO(g))rarr2SO_(3(g))`
`2CO_((g))+O_(2(g))overset(PT(s))rarr2CO_(2(g))`
`CH_(3)CHO_((g))overset(I_(2)(g))toCH_(4(g))+CO_(g)`

Answer :C
Discussion
12327.

Which of the following have identical bond order

Answer»

A) `CN^(-)`
B) `NO^(+)`
C)`O_(2)^(-)`
D) `CN^(-)` and `NO^(+)` both

ANSWER :D
Discussion
12328.

Which of the following is not a semi-synthetic polymer ?

Answer»

cis-Polyisoprene
CELLULOSE NITRATE
Celluloseacetate
Vulcanised rubber

SOLUTION :cis-Polyisoprene is natural rubber hence, is a natural polymer.
Discussion
12329.

Which product is expected to predominate in the given reaction (AAK_MCP_35_NEET_CHE_E35_017_Q01)

Answer»


`(AAK_MCP_35_NEET_CHE_E35_017_A01)`

ANSWER :B
Discussion
12330.

What is the pH of a 1 M CH_(3)COOH a solution K_(a) of acetic acid = 1.8 xx 10^(-5) K = 10^(-14) mol^(2) "litre"^(-2)

Answer»

9.4
4.8
3.6
2.4

Solution :`CH_(3)COO^(-) + H_(2)O hArr CH_(3)COOH + OH^(-)`
`:. [OH^(-)] = c XX h`
`h = sqrt((K_(w))/(K_(a)) xx C) = sqrt((10^(-14))/(1.8 xx 10^(-5)) xx 1) = 2.35 xx 10^(-5)`
`:. pOH = 4.62 , pH = 9.38 ~~ 9.4`.
Discussion
12331.

Which one of the followingmetal , is extraced on smeltingof its ore in blast furnance ?

Answer»

IRON
Sodium
Potassium
magnesium

Solution :When smelting is done in a blast furnance the METAL extractedis iron which is SHOWN by the following REACTION .
`Fe_(2)O_(3) +3C overset( gt 1123K)to 2Fe+3CO`
`Fe_(2)O_(3)+3CO overset(1123K)to 2Fe+3CO_(2)`
Discussion
12332.

What are thetwo types of batteries?

Answer»

SOLUTION :The TWO types of BATTERIES are primary batteries (NON - RECHARGEABLE) and secondary batteries (rechargeable).
Discussion
12333.

To have practical applications, why are cross-links required in rubber?

Answer»

SOLUTION :Cross-links BIND the planar polymer sheets THUS increasing its elastomeric PROPERTIES.
Discussion
12334.

Which of the following is structural formula of orange dye ?

Answer»




ANSWER :C
Discussion
12335.

Which of the following compounds can be classified as aryl halides ?

Answer»

`p-ClC_(6)H_(4)CH_(2)CH(CH_(3))_(2)`
`p-CH_(3)CHCL(C_(6)H_(4))CH_(2)CH_(3)`
`o-BrH_(2)C-C_(6)H_(4)CH(CH_(3))CH_(2)CH_(3)`
`C_(6)H_(5)-Cl`

SOLUTION :
Discussion
12336.

Which type of detergent is LAS. (i) Anionic (ii) Cationic (iii) Biosoft (iv) Biohard

Answer»

(i) and (IV) 
(i) and (iii) 
(II) and (iii) 
(ii) and (iv) 

Solution :LAS is anionic biosoft detergent which had linear alkyl benzenesulphonate.

Linear SODIUM dodesile benzenesulphonate (LAS).
Discussion
12337.

What are antipyretic drugs? Name one of them . Can it play any other role ?

Answer»

SOLUTION :Antipyreticsbring down the temperature of feveral BODY e.g. phenacetic.
YES, it ALSO ACTS as analgesic.
Discussion
12338.

Why alcohols cannot be used as solvents with (a) Grignard reagent and (b) LiAlH_(4).

Answer»

Solution :Alcohols are sufficiently acidic to react with strong BASES `R^(-) : and H^(-)` :
`CH_(3)OH+H-overset(H)overset(|)UNDERSET(H)underset(|)C-MgX RARR CH_(4)+(CH_(3)O)-MgX`
`4CH_(3)OH+LiAlH_(4)rarr 4H_(2)+LiAl(OCH_(3))_(4)`
Discussion
12339.

Which element is doped with Si to form p-type of semiconductor ?

Answer»

GE 
SE 
As 
B 

ANSWER :D
Discussion
12340.

When MnO_(2) is fused with KOH in the presence of KNO_(3) as an oxidizing agent, it gives a dark green compound (A). Compound (A) disproportionates in acidic solution to give purple compound (B). An alkaline solution of compound (B) oxidises KI to compound (C) whereas an acidified solution of compound (B) oxidises KI to (D). Identify (A), (B), (C) and (D).

Answer»

SOLUTION :`A=K_(2)MnO_(4)//MnO_(2)^(2-), B=KMnO_(4)//MnO_(4)^(-), C=IO_(3) or KlO_(3), D=l_(2)`
Discussion
12341.

Writethe nameandstructureof themonomer of nylon 6.

Answer»

SOLUTION :MONOMER of NYLON 6 iscaprolactum. It has the STRUCTURE .
Discussion
12342.

Which of the following are forced to accept protons from HF when dissolved in HF is l are

Answer»

`HNO_(3)`
`HCL`
`H_(2)SO_(4)`
`SbF_(5)`

SOLUTION :HF is strong oxidant thanHCl` ,HNO_(3) ` and `H_(2) SO_(4)`
Discussion
12343.

The solution containing dissolved CO_2is 0.035 M. If the dissociation constants for the reactionsCO_2 + H_2O = H^(+) + HCO_3^-HCO_3^(-) = H^(+) + CO_3^(2-)are 4.16 xx 10^(-7)and 4.84 xx 10^(-11)respectively, calculate [H^+]in the solution.

Answer»

SOLUTION :`1.2 XX 10^(-4)M`
Discussion
12344.

Which of the following acts as both oxidant and reductant -

Answer»

`HNO_(3)`
`HNO_(2)`
Both `HNO_(3)` & `HNO_(2)`
Neither `HNO_(3)` nor `HNO_(2)`

Solution :O.N. of N in `HNO_(2)` is `+ 3`
Max. O.N.Of N is `+5`
Min. O.N. of N is -3
Thus O.N. of N in `HNO_(2)` can show an increase or decrease as the CASE may be. That is why `HNO_(2)` acts as oxidant and reductant both. O.N. of N in `HNO_(3)` is `+ 5`. Hence it can act only as an oxidant.
Discussion
12345.

Which of the following statements is wrong in case of ethoxythane:

Answer»

It is USED as anaesthetic
It is inflammable
It is dipole moment is zero
It is soluble in CONC.`H_2SO_4`

Answer :C
Discussion
12346.

Which is the most stable conformer among the given conformers ?

Answer»





SOLUTION :CONFORMER (C) is MOT STABLE.
Discussion
12347.

Which of the following has 'S configuration ?

Answer»




ANSWER :D
Discussion
12348.

Which of the following is not a p-block element ?

Answer»

BARIUM
Nitrogen
Selenium
Tellurium

ANSWER :A
Discussion
12349.

When acidified K_2Cr_2O_7 solution is added to Sn^(2+) salts, then Sn^(2+) changes to

Answer»

SN
`Sn^(3+)`
`Sn^(4+)`
`Sn^(+)`

SOLUTION :`Sn^(4+)`
Discussion
12350.

Which of the following pair will form same osazone when it reacts phenyl hydrazine ?

Answer»




SOLUTION :N//A
Discussion