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15401.

Which of the followings will give colourless solution with hot acidic KMnO_(4)

Answer»




NON of these

SOLUTION :N//A
Discussion
15402.

What is a biodegradable polymer ? Give an example of a biodegradable aliphatic polyester.

Answer»

SOLUTION :Polymers which disintegrate over a period of TIME in environmental degradation by BACTERIA, etc., are called biodegradable polymers. An example of biodegradable ALIPHATIC polyester is PHBV, IE, Poly-B-hydroxybutyrate-co-B-hydroxyvalerate. It is obtained as under:
Discussion
15403.

What is the minimum mass of NaBr which should be added in 200 ml of 0.0004 M-AgNO_(3) solution just to start the precipitation of AgBr ? The value of K_(sp) of AgBr = 4 × 10^(-13) (B Solution : r = 80)

Answer»

`1.0 xx 10^(-9)g`
`2 xx 10^(-10) g`
`2.06 xx 10^(-8)g`
`1.03 xx 10^(-7)g`

Solution :`AgBr(s) For precipitation, `Q > K_(sp)`
or, `0.0004 xx [ Br^(-)] > 4 xx 10^(-13)`
`:. [ Br^(-)] > 10^(-9) M`
HENCE, MINIMUM mass of NaBr needed
`=((200xx10^(-9))/(1000)) xx 103 = 2.06 xx 10^(-8) gm`.
Discussion
15404.

Whichof the followingis a carbohydrate ?

Answer»

LEUCINE
Albumin
Inulin
MALTASE

ANSWER :C
Discussion
15405.

Upon treatment with ammonical H_(2)S, the metal ion that precipitates as a sulfide is

Answer»

Fe(III)
Al(III)
Mg(II)
ZN(II)

Solution :Ammonical `H_(2)S` is GROUP REAGENT of fourth group cationic radicals. `Fe^(3+)&Al^(3+)` will precipitate `Fe(OH)_(3)` and `Al(OH)_(3)` respectively.only zinc will form white precipitate of ZnS.
Discussion
15406.

Which of the following indicates the number of free -OH groups in an oil or fat

Answer»

IODINE value
Acid value
Acetyl value
Saponification value

Answer :B
Discussion
15407.

When 2-butyne is hydrated with dil. H_2SO_(4) in presence of HgSO_(4), it gives ____.

Answer»

SOLUTION :2-butanone.
Discussion
15408.

Which statement is correct with respect to the property of the elements with increase in atomic number in the carbon family ?

Answer»

Their metallic character decreases
The STABILITY of `+2` OXIDATION state increases
Their ionization ENERGY increases
Their atomic size decreases

Answer :B
Discussion
15409.

The state of a mole of an ideal gas changed from state A at pressure 2P and volume V follows four different processes and finally returns to initial state A reversibly as shown below in the graph. By intercepting the graph answer the following questions: Which is the kind of process followed from state A to state B?

Answer»

isochoric expansion
isobaric expansion
ISOTHERMAL reversible expansion
isothermal IRREVERSIBLE compression.

ANSWER :B
Discussion
15410.

The state of a mole of an ideal gas changed from state A at pressure 2P and volume V follows four different processes and finally returns to initial state A reversibly as shown below in the graph. By intercepting the graph answer the following questions: In state D to state A what kind of process is followed?

Answer»

ISOBARIC EXPANSION
Isobaric compression
Isochoric process
Isothermal compression

Answer :C
Discussion
15411.

Which of the following compound can exhibit enantiomerism ?

Answer»




ANSWER :B
Discussion
15412.

There are servral methods for refining metals. Explain a method for refining Zirconium.

Answer»


ANSWER :REFER to THEORY SECTION 6.7 (E)
Discussion
15413.

Zone refining is a method to obtain

Answer»

Very HIGH temperature
ULTRA PURE Al
Ultrapure GERMANIUM
Ultra pure oxides

Answer :A::C
Discussion
15414.

Which of the following can control the photochemical smog? (A) Use of catalytic converters in automobiles. (B) Plantation of trees like pinus, pyrus and vilis etc. (C) Using less sulphur containing fossil fuels

Answer»

A and C
B
A and B
A, B and C

Solution :Usually catalytic converters are used in the automobiles, which prevent the release of nitrogen oxide and hydrocarbons to the atmosphere. Certain plants e.g., PINUS, Juniparus, QUERCUS, PYRUS and Vilis can metabolise nitrogen oxide and THEREFORE, their plantation COULD help in this matter
Discussion
15415.

Which one of the following reduces tollens reagent

Answer»

FORMIC acid
acetic acid
benzophenone
none of these

SOLUTION :`H - oversetunderset(||)(O)(C ) - OH`
Discussion
15416.

Total number of lone pair of electron and P–O–P linkage present in dimer of P_(2)O_(5) are :-

Answer»

16, 4
20, 6
22, 6
30, 4

ANSWER :B
Discussion
15417.

Which type of nylon is used in making brushes, synthetic fibres, parachute, ropes and carpets?

Answer»

NYLON - 2
nylon - 6
nylon 6, 6
nylon-2, nylon 6

Solution : nylon 6, 6
Discussion
15418.

To observe the effect of concentration on the conductivity ele

Answer»

in A CONDUCTIVITY increases , in B conductivity decreases
in A conductivity decreases, while in B conductivity increases ,
in both A and B conducitvity increase
in both A and B conductivity decrease.

Solution :Solution which contains contains large number of ions compared to another solution of same conscentration at the same TEMPERATURE has more conductance and is SAID to be stronger electrolyte. The one which has relativley smal number of ions is called weak electroyte. If concentraion of respective elctrolyte was increased, the equivent conductance decresed in each care, but rapid decrease in equivalent conductance is SEEN in weak electrolyte.
Discussion
15419.

Which is a reducing sugar :

Answer»

GLUCOSE
FRUCTOSE
GALACTOSE
All

Answer :D
Discussion
15420.

The structures represent

Answer»

GEOMETRICAL ISOMERS
positional isomers
conformational isomers
configurational isomers

Answer :D
Discussion
15421.

What happens when? (i) Urea is heated with acetoacetic ester, (ii) Urea is heated with succinic acid (iii) Urea is treated with sodium hypobromide in alkaline medium, (iv) Urea is treated with acetyl chloride.

Answer»

SOLUTION :(i) Enolic FORM of acetoacetic ester REACTS with urea to form METHYL uracil,

Discussion
15422.

Which one of the following is an amphoteric oxide?

Answer»

`Na_(2)O`
`SO_(2)`
`B_(2)O_(3)`
`ZNO`

Solution :`Na_(2)O` (basic), `SO_(2)` and `B_(2)O_(3)` (ACIDIC) and ZnO is AMPHOTERIC.
Discussion
15423.

The structure of 4-methyl-2-pentan-1-ol is :

Answer»

`CH_(3)CH_(2)CH=CHCH_(2)OH`
`(CH_(3))_(2)C=CHCH_(2)CH_(2)OH`
`(CH_(3))_(2)CHCH=CHCH_(2)OH`
`CH_(3)CH_H-CH=C(CH_(3))_(2)`

ANSWER :C
Discussion
15424.

Which of the following is more basic than aniline ?

Answer»

<P>DIPHENYLAMINE
Tripheylamine
p- NITROANILINE
BENZYLAMINE

SOLUTION :
Discussion
15425.

Which colloidal sol is administered to a [atient suffereing from arscenic poisoning?

Answer»


ANSWER :`Fe(OH)_(3)`, SINCE it ADSORBS arsenic on itself and can be vomited out.
Discussion
15426.

Which of the following compound can occur in enatiomeric form ?

Answer»




ANSWER :B
Discussion
15427.

Which of the folowing is a sulphide ore?

Answer»

Magnetite
Haematite
Calamine
Ironpyrites

Answer :4
Discussion
15428.

Write the IUPAC name of the product formed when nitrobenzene is reduced using tin and concentrated hydrochloric acid.

Answer»

SOLUTION :`underset("NITROBENZENE")(C_(6)H_(5)NO_(2)) overset(Sn//HCl)to underset(underset("Benzenamine")(C_(6)H_(5)NH_(2))`.
Discussion
15429.

Which ne among the following is not a property of salt

Answer»

I and II only
I,II and III
I and III only
II only

SOLUTION :pH is TH enegative lagarthim of the RECIPROCAL of `H^(+)` ION concentration of a solution
`pH=-log[H^(+)]`
then pH range is taken to 0 to 14 and the acidiity of solution INCRESES with decrease in the value of pH
Discussion
15430.

V_(1) mL of SO_(2), filled in a tube at 1 atm between a movable frinctionless piston and a porous plug. The tube is left in air till the piston stops moving. The volume V_(1) is found to increase to V_(2). The volume V_(2) contains

Answer»

AIR only
`SO_(2)` only
both air and `SO_(2)`
NEITHER air nor `SO_(2)`

ANSWER :A
Discussion
15431.

Write the IUPAC name of [Pt(NH_3)_3(H_2O)Cl_2].

Answer»

SOLUTION :Triamine AQUA dichlorido PLATINUM (11)
Discussion
15432.

The s-block element used as a catalyst in the manufacture of buna-S rubber is

Answer»

MG
CA
BA
NA

ANSWER :D
Discussion
15433.

Which of the following polymers is used for coating as a thin layer on the inner side of non - sticking pans ?

Answer»

Bakelie
PVC
Styrene
TEFLON

ANSWER :D
Discussion
15434.

Which is not an ore of lead?

Answer»

Galena
Anglesite
Calamine
Cerussite

Answer :C
Discussion
15435.

The reagent choice for the selective reduction of a ketone in the presence of an ester is :

Answer»

LITHIUM ALUMINIUM hydride
Sodium borohydride
Hydrogen and PALLADIUM on carbon
Sodium in ethanol

Answer :B
Discussion
15436.

Which of the following reactions taking place in the blast furnace during extraction of iron is endrothermic

Answer»

`CaCO_(3) rarr CaO + CO_(2)`
`2C + O_(2) rarr 2CO`
`C + O_(2) rarr CO_(2)`
`Fe_(2)O_(3) + 3CO rarr Fe_(2)O_(3) + 3CO rarr 2FE + 3CO_(2)`

Answer :A
Discussion
15437.

Use Hund's rule to derive the electronic configuration of Ca^(3+) ion, and calculate its magnetic moment on the basis of 'spin-only' formula.

Answer»

Solution :Ceriumhas the configuration :
`[Xe]4F^(1)5d^(1)6s^(2)`
Configuration of `Ce^(3+)` may be written as :
`[Xe]4f^(1)`, i.e., there is only one unpaired electron, i.e., n = 1.
Hence, MAGNETIC moment is given by :
`mu=sqrt(n(n+2))=sqrt(1(1+2))=sqrt(3)=1.73` BM.
Discussion
15438.

What happens when chromates are kept in acidic solution and dichromates in the alkaline solution ?

Answer»

SOLUTION :CHROMATES in acidic solution are CONVERTED into dichromate and thus, the solution ACQUIRES orange colour. On the other hand, dichromates in alkaline solution get converted to chromates and the colour of the solution CHANGES from orange to yellow.
Discussion
15439.

Which element of group 14 forms only one hydride ?

Answer»

C
Si
Sn
Pb

Answer :D
Discussion
15440.

Which of the following statement is/are not true ?

Answer»

`Fe_((aq))^(2+)` gives brown colour with `NH_(4)SCN`
`Fe_((aq))^(3+)` gives BLOOD red colour with `NH_(4)SCN`
`Fe_((aq))^(2+)`yieids colour with `K_(2)Fe(CN)_(6)`
`AG^(o+)`reacts with `CO_(3)^(2-)` then black ppt is formed

Answer :a,c,d
Discussion
15441.

Which of the following represents Freon ?

Answer»

Acetylene tetrachloride
Trichloroethylene
DICHLORODIFLUOROMETHANE
Ethylene dichloride

Solution :`UNDERSET("Freon")(F-OVERSET(F)overset(|)underset(Cl)underset(|)(C )-Cl)` (Dichlorodifluoromethane)
Discussion
15442.

The value of ._m^(^^oo) for acetic acid. If the equivalent conductivity of the given acetic acid is 48.15" at "25^(@)C, calculate its degree of dissociation.

Answer»


ANSWER :A::B::C
Discussion
15443.

The structural formula of alcohol that on dehydration would give 2-methylpropene as the major product is

Answer»

`CH_3CH_2CH_2CH_2OH`
`(CH_3)_2CH - CH_2OH`
`CH_3-CHOH - CH_2CH_3`
`CH_3CHOHCH_3`

ANSWER :B
Discussion
15444.

What is crazy glue or super glue ?

Answer»

Solution :Crazy glue or super glue is a polymer of `alpha`-cyanoacrylate `(CH_2=C(CN)COOCH_3)`. Due to the presence of TWO powerful electron - withdrawing groups `(-CN and -COOCH_3)` , it quickly undergoes polymerization even in presence of basic IMPURITIES such as metal oxides present on the surface of the ordinary glass of give super glue or crazy glue, it has a highe tensile strength , ONE drop of it is clanined to SUPPORT a weight of 200 lb.
Discussion
15445.

Total number of valency electrons in phosphonium ion PH_(4)^(+) is

Answer»

18
32
8
16

Answer :C
Discussion
15446.

Whatis the differencebetweena nucleosideand a nucleotide ?

Answer»


Solution :Nucleosideis formedby thecondensationof a purineor pyrimidine BASE withpentosesugar atposition 1. When nucleoside is linkedto phosphoricacidat 5 positionof sugar moity , wegeta nucleotid . Hence a nucleotidehas THREE units - Phosphate group penose sugarand abase ,WHEREAS nucleoside has TWO units- pentose sugarand base .
Discussion
15447.

What are ionisation isomers ?Explainwithan example

Answer»

Solution :Ionisation isomersarises whenan ionisable counterion (SIMPLE ion) itselfcan act ASA ligand. The exachangeof suchcounterionswithone ormoreligands in the coordinationentity will resultin ionisation isomers.
Somemoreexamplefor the isomers.
1. `[Cr(NH_(3))_(4) ClBr]NO_(2) and[Cr(NH_(3))_(4)CI NO_(2)] Br `
2. ` [Co(NH_(3))_(4) Br_(2)] CI and [Co(NH_(3))_(4) CI Br]Br`
Discussion
15448.

What volume at STP of CO is required to reduce one mole of Fe_2O_3 in the following reaction Fe_2O_3 + CO to Fe + CO_2

Answer»

`11200 cm^3`
`22400 cm^3`
`67200 cm^3`
`33600 cm^3`

ANSWER :C
Discussion
15449.

Write reaction for obtaining: (i) Acetone from acetic acid. (ii) Benzene from toluence.

Answer»

SOLUTION :The DESIRED PRODUCTS are OBTAINED as FOLLOWS:
Discussion
15450.

Which of the following mixture will not be a buffer solution?

Answer»

Borax + Boric acid (1:1 MOLAR ratio)
`NH_(4)Cl + NaOH` (2:1 molar ratio)
`HCOOH + NaOH` (1:1 molar ratio)
`H_(3)PO_(2) + NaH_(2)PO_(2)`

Solution :HCOOH and NaOH in `1: 1` molar ratio, will form HCOONa, so HCOOH will not be REMAINING left.
Discussion