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4201.

Which of the following is the correct increasing order of the ionic radii

Answer»

`LI^(+)ltMg^(2+)LTK^(+)ltAl^(3+)`
`Al^(3+)ltLi^(+)ltMg^(2+)ltK^(+)`
`Al^(3+)ltMg^(2+)ltK^(+)ltLi^(+)`
`K^(+)ltAl^(3+)ltMg^(2+)ltLi^(+)`

Solution :Ionic radii increases down the group and DECREASES from left to right in a period.
Discussion
4202.

Which compound/set of compounds is used in the manufacture of nylon 6?

Answer»


`HOOC(CH_2)_4COOH+NH_2(CH_2)_6NH_2`
`CH_2=CH-overset(CH_3)overset|C=CH_2`

SOLUTION :Nylon-6 can be MANUFACTURED from
Discussion
4203.

Which of the following is least stable

Answer»

Which of the FOLLOWING is LEAST STABLE
Which of the following is least stable
Which of the following is least stable
Which of the following is least stable

ANSWER :D
Discussion
4204.

Write the IUPAC name for the ionisation isomer of [Co(NH_(3))_(5)SO_(4)]Br.

Answer»

SOLUTION :Ionisation ISOMER of the given compound is `[Co(NH_(3))_(5)Br]SO_(4)`. Its name is pentaamminebromidocobalt(III) sulphate.
Discussion
4205.

Urea reacts with HNO_3 to give :

Answer»

UREA NITRITE
Urea NITRATE
`H_2CO_3`
None

Answer :B
Discussion
4206.

Which of the following has highest bond dissociation energy?

Answer»

`NH_(3)`
`AsH_(3)`
`SbH_(3)`
`BiH_(3)`

Answer :A
Discussion
4207.

Why are Zn, Cd, Hg volatile metals ? Explain.

Answer»

SOLUTION :Due to WEAK interatomic attraction/low BOILING POINT.
Discussion
4208.

Which of the following is a local anaesthetic?

Answer»

Mescaline
Procaine
Diazepam
None of these

Solution :The anaesthetics produce temporary insensitibility to the vital function of all type of cells, SPECIALLY of nervoussystem and are USED during surgical operations.
These are classified as (a) GENERAL ANAESTHETIC - producing unconsciouness all over the body e.g. `N_(2)O`, Cyclo propane, chloroform (b) Local anaesthetic - effect only the part of body e.g. Xylocaine, Procain etc.
Discussion
4209.

Which one of the following ststement is false about osmotic pressure ?

Answer»

It is the PRESSURE of the hydrostatic column set up due to osmosis.
It is the pressure applied on the solution to prevent the entry of the solvent into it through the semi- permeable membrane.
During osmosis, the FLOW of solvent is only from DILUTE solution to concentrated solution.
Osmotic pressure is directly proportional to the TEMPERATURE of the solution.

Solution :During osmosis, the flow of solvent is from both sides (Net flow is from dilute solution to concentrated solution ).
Discussion
4210.

Which of the following statements are true for Mohr's salt?

Answer»

It DECOLOURIZES `KMnO_(4)` solution
It is a double salt
It is colourless salt
It is a PRIMARY standard substance

Answer :A::B::D
Discussion
4211.

When conc. HCl is mixed with conc. HNO_3, the species produced are

Answer»

`NO_(2), Cl_(2) and H_(2)O`
`NO, Cl_(2) and H_(2)O`
`NOCL , Cl_(2) and H_(2)O`
`NO_(2) and HOCL`

ANSWER :C
Discussion
4212.

Which of the following halogens has some metallic character?

Answer»

F
CL
Br
I

ANSWER :D
Discussion
4213.

The relative ease of dehydration of alcohols is : tertiarygtseconarygtprimary.

Answer»

Solution :The dehydration of ALCOHOLS occurs through carbocation intermediates. Since the stability of carbocations DECREASES in the order: `3^(@) gt 2^(@) gt 1^(@)`. Therefore, dehydration of alcohols follows the same order, i.e., tertiarygtsecondarygtprimary.
Discussion
4214.

When 60.26g of VCl_(4) was added to 1000g of solvent "CC"l_(4), the freezing point of "CC"l_(4) was depresed by 5.415^(@)C. K_(f) for "CC"l_(4) is 29.9. Compare the number of moles of particles with the number predicted by the formula. Calculate the number of dimers, V_(2)Cl_(8) present.

Answer»


SOLUTION :`2VCl_(4) to V_(2)Cl_(8)`
Discussion
4215.

The specific conductance of a saturated solution of AgCl at 25^(@)C after subtracting the specific conductance of conductivity of water is 2.28 xx 10^(-6) mho cm^(-1). Find the solublity product of AgCl at 25^(@)C. (Lambda_(AgCl)^(@) = 138.3 "mho cm"^(2))

Answer»

Solution :For equilibrium,
`AgCl = Ag^(+) + Cl^(-)`
`K_(sp) [Ag^(+)][Cl^(-)]`
If the solubility of AgCl in water is, SAY, x moles/litre or x eq./L,
`K_(sp) = x.x = x^(2)`
`therefore` volume containing 1 eq. of AgCl `= (1000)/(x)`
`Lambda_(AgCl) = "sp. cond. xx V`
`= 2.28 xx 10^(-6) xx (100)/(x)`.
Since AgCl is sparingly soluble in water, `Lambda_(AgCl) = Lambda_(AgCl)^(@) = 138.3`
`therefore 2.28 xx 10^(-6) xx (1000)/(x) = 138.3`
or `x = 1.644 xx 10^(-5)` eq./litre or mole/litre
`K_(sp) = x^(2) = (1.644 xx 10^(-5))^(2)`
`= 2.70 xx 10^(-10) ("mole/litre")^(2)`
Discussion
4216.

Which of the following is incorrect regarding spectrochemical series?

Answer»

`NH_(3) gt H_(2)O`
`F^(-) gt C_(2)O_(4)^(2-)`
`NCS^(-) gt SCN`
`CN gt EDTA^(4-)`

SOLUTION :ACCORDING to spectrochemical series `C_(2)O_(4)^(2-) gt F^(-)`
Discussion
4217.

Which of the following oxoacids contains more than one S-S bonds ?

Answer»

Dithionic ACID
Thiosulphorus acid
Polythionic acid
Peroxodisulphuric acid

ANSWER :C
Discussion
4218.

Which one of the following statements is true regarding vitamin ?

Answer»

Vitamins are needed in LARGE amounts to maintain good health
Vitamins are SECRETED by ductless glands
Vitamins A,D,E,K are FAT soluble and vitamins B complex and C are water soluble
All vitamins are synthesised in human body 

Answer :D
Discussion
4219.

Transition metals are widely used as catalysts in industrial processes. Transition metals exhibit catalytic properties. Why?

Answer»

Solution :TRANSITION metals SHOW catalytic properties because of their ABILITY to exhibit VARIABLE oxidation STATES and to form complexes.
Discussion
4220.

Which statement is incorrect about graphite?

Answer»

It is layered structure
Layers are heald by van DER Waal FORCE of ATTRACTION
It is USED as a dry lubricant
Each carbon in hexagonal RING is `sp^3` hybridised

Answer :D
Discussion
4221.

What mass of potassium chlorate (KCIO_(3)) on heating gives 1.491 g of potassium chloride (KCl) and 0.672 litres of oxygen at NTP?

Answer»


SOLUTION :MASS of 22.4 LITRE of OXYGEN at NTP=32g
Discussion
4222.

Which of the halogens has lowest bond energy?

Answer»

`F_(2)`<BR>`Br_(2)`
`Cl_(2)`
None of these

Solution :The bond energy of F-F bond is least, because of strong inter-electronic repulsions acting between the lone pairs of electrons of the twvo F-atoms. After fluorine, the bond energy increases from `Br_2" to "Cl_2` because increased SIZE RESULTS in less effective OVERLAP of orbitals. Hence, `Cl_2` has highest bond energy.
Discussion
4223.

Whatis the nameof the process of synthesis of mRNA form DNA strand ?

Answer»

TRANSPIRATION
Transciption
Transformation
Trans ESTERIFICATION

ANSWER :B
Discussion
4224.

Two sealed containers of the same capacity and at the same T are filled with 44 g of H_2 gas in one and 44 g of CO_2 in other. If the P of CO_2 is 1 atm in other, the P of H_2 in its container will be :

Answer»

1 atm
Zero
22 atm
44 atm

Answer :C
Discussion
4225.

Write steps involved in S_(N)1 mechanism to the conversion of tertiary butyl bromide into tertiary butyl alcohol and mention its order.

Answer»

SOLUTION :
Discussion
4226.

What is X.

Answer»

<P>`H_(4)P_2O_7`
`H_(4)P_(2)O_6`
`HPO_3`
None

Solution :
`X = H_(4)P_(2)O_7`
Discussion
4227.

Vulcanised rubber resists

Answer»

Jerking movement
Cold temperature
Drops of acid RAINS
WEAR and TEAR due to friction

ANSWER :D
Discussion
4228.

What is the other name of chemical adsorption ?

Answer»

CHEMISORPTION
Physiorption 
Chemistrisorption
None of above 

SOLUTION :Chemisorption
Discussion
4229.

Two moles of an ideal monoatomic gas at 5 bar and 300 K are expanded irreversibly up to an external pressure of 1 bar. The work is done by the gas is xR (in bar. Litre). The value of 'x' is [R is gas constant]

Answer»


ANSWER :288
Discussion
4230.

What are the monomeric repeating units of Nylon 6 and Nylon 6,6 ?

Answer»

SOLUTION :The MONOMERIC repeat unit of Nyon 6 is `-NH-(CH_(2))_(5)- overset(O)overset(||)(C)-` which is derived from caprolactam. The monomeric repeat unit of Nylon6,6is derived from TWO monomers, HEXAMETHYLENEDIAMINE and adipic acid and has the following structure.
`-NH-(CH_2)_(6)-NH-overset(O)overset(||)(C)-(CH_2)_(4)-overset(O)overset(||)(C)-`
Discussion
4231.

When RNA is hydrolysed, there is no relationship among the quantities of different bases obtained ? What does this fact suggest about the structure of RNA ?

Answer»

Solution :In DNA MOLECULE, there are four COMPLEMENTARY bases pairs (A, T) and (G, C) have double helix structure. DNA has two strands. On hydrolysis, the DNA produces equimolar of complementary bases, i.e., amount of adenine equal to thymine and that of guanine equal to cytosine. In RNA, there are also four bases, i.e., Adenine, Guanine, Cytosine and Uracil and there is no relationship between the QUANTITIES of four bases and therefore UNLIKE DNA, RNA has a single strand.
Discussion
4232.

which molecule will be exhibit keto-enol tautomerism ?

Answer»




ANSWER :D
Discussion
4233.

Write the structure of all possible dipeptides which can be obtained form glycine and alanine

Answer»

SOLUTION :
Discussion
4234.

Which one of the following reagents is suitable for the converston of 2-cyclohexansion into 3-methylcyclohexanone ?

Answer»

`CH_(3)MGL`
`(CH_(3))_(2)CuLi`
`CH_(3)I_(2)` and `Zn`
`CH_(3)AlCl_(2)`

ANSWER :B
Discussion
4235.

Which compound in the following couples will react faster in S_(N^(2)) displacement and why? (a). 1-Bromopentane or 2-Bromopentane (b). 1-Bromo-2-methylbutane or 2-Bromo-2-methylbutane?

Answer»

Solution :(a). 1-Bromopentane since it is a parimary ALKYL halide and not 2-Bromopentane since it is a secondary alkyl halide.

(B). 1-Bromo-2-methylbutane since it is a PRIMARY alkyl halide and not 2-Bromo-2-methyl butane since it is a tertiary alkyl halide.
.
Discussion
4236.

When propionic acid is treated with aqueous NaHCO_(3),CO_(2)is liberated. The .C. of CO_(2) comes from

Answer»

METHYL group
carboxylic ACID group
methylene group
bicarbonate.

Answer :D
Discussion
4237.

The red coloured compound formed during Victor-Meyer's test for ethanol is

Answer»

`CH_(3)-underset(NOH)underset(||)(C)-NO_(2)^(-)Na^(+)`
`CH_(3)-underset(N-O^(-)Na^(+))underset(||)(C)-NO_(2)`
`CH_(3)CH=NOH`
`CH_(3)CH_(2)-NHOH`

Solution :`underset(1^(@)" Alcohol")(CH_(3)CH_(2)OH) overset(P+I_(2))toCH_(3)CH_(2)I overset(AgNO_(2))to CH_(3)CH_(2)-NO_(2) overset(HONO)to CH_(3)-underset(NOH)underset(||)(C)-NO_(2) overset(NAOH)to underset(NO^(-)Na^(+))underset(||)(C)-NO_(2)`
Discussion
4238.

Which one of the following is an local anaesthetic?

Answer»

LIDOCAINE
Propofol
ISO flurane
ibuprofen

Solution :lidocaine
Discussion
4239.

The stable oxidation state of Mn are

Answer»

`+2`
`+7`
`+3`
`+5`

Solution :`MN^(+2) =[Ar]3d^5 , Mn^(+7) = [Ar]`
Discussion
4240.

Which of the following method is used for measuring the osmotic pressure of the solution

Answer»

OSTWALD METHOD
Berkeley HARTLEY method
Solvay method
Haber's method

Solution :Berkley-Hartley method
Discussion
4241.

Which of the following has a maximum number of unpaired electron?

Answer»

Zn
`FE^(2+)`
`NI^(2+)`
`Cu`

Solution :`Zn(O),Fe^(2+)(4),Ni^(2+)(2),Cu(1)`.
Discussion
4242.

Which of the following are pi-bonded organometallic compounds ?

Answer»

FERROCENE
Diethyl zinc
Ethylmagnesium iodide
Dibenzene chromium

Solution :`PI`-complexes are
`implies [FE(eta^(5)-C_(5)H_(5))_(2)][Cr(eta^(6)-C_(6)H_(6))_(2)]`
Discussion
4243.

The value of one Faraday is equal to ………….. .

Answer»

`96400 C`
`96500 C`
`1.602 XX 10^(-19)C`
`1.602 xx 10^(19)C`

ANSWER :B
Discussion
4244.

Which one of the following is a anionic detergent ?

Answer»

SODIUM lauryl sulphate
cetyltrimethyl AMMONIUM bromide
Glycerol oleate
sodium stearate

Answer :A
Discussion
4245.

Which product will be obtained when "CCl"_(4) adds on R-CH=CH_(2)? Give the mechanism of formation of the products.

Answer»

Solution :`R-CH=CH_(2)+"CCl"_(4)rarrR-CHCl-CH_(2)-"CCl"_(3)+R-CHCl-CH_(2)-underset(R)underset(|)"C"H-CH_(2)-"CCl"_(3)`
Second product is formed due to COMBINATION of `R-underset(o+)"C"H-CH_(2)-"CCl"_(3)` and `R-underset(CL)underset("| ")"CH"-underset(o+)"C"H_(2)` intermediates.
Discussion
4246.

What is the role of adsorption in froth floatation process used especially for concentration of sulphide ores ?

Answer»

SOLUTION :In a froth floatation process, the pine oil ACT as an adsorbent which forms an EMULSION and COMES out in the form of the froth. Whereas the impurities are wetted by the WATER.
Discussion
4247.

What are antihistamines ? Give two examples. Explain how do they act on the human body ?

Answer»

Solution :The hypersensitivity of some persons towards certain drugs (penicillin, sulpha drugs), DUST, pollen GRAINS, cat fur, a particular food or fabric, etc. is CALLED allergy. Allergy is caused by RELEASE of a substance called histamine in the body Antihistamines are drugs which either reduce or inhibit the action of histamine in the body thereby preventing allergy. Two important ANTIHISTAMINE or anti-allergic drugs are brompheniramine and terfenadine.
Mode of action. Histamines interact with the binding sites of receptor in the body to produce allergy. Antihistamines compete with histamines for these binding sites of receptor and thus do not allow histamine to produce allergy. Thus, antihistamines are drugs which interfere with the natural action of histamine by competing for histamine binding sites of receptor.
Discussion
4248.

Which of the following pair of molecules will have permanent dipole moment for both molecules ?

Answer»

1. `NO_(2)`and `CO_(2)`
2. `NO_(2)` and `O_(3)`
3. `SiF_(4)`and`CO_(2)`
4. `SiF_(4)`and`NO_(2)`

Solution :Because both have ANGULAR shape.
Discussion
4249.

Which of the following is used to prepare ketone from acyl chloride

Answer»

R-MgX
`R_(2) Cd`
`CO + HCl `
`CrO_(3)`

ANSWER :B
Discussion
4250.

Which product is obtained when chlorobenzene react with 6 to 8% aq. NaOH at 633 K and 300 bar pressure in presence of acid catalyst ?

Answer»

BENZENE
PHENOL
2,4,6-trinitrophenol
ANILINE

ANSWER :B
Discussion