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22301.

Which has minimum number of unpaired d-electrons ?

Answer»

`FE^(3+)`
`Co^(3+)`
`Co^(2+)`
`Mn(+2)`

Answer :C
Discussion
22302.

Waxes are long chain compounds belonging to the class of :

Answer»

Acids
Alcohols
ESTERS
Ethers

Answer :C
Discussion
22303.

Write the formulas for the following coordination compounds : Tetraamminediaquacobalt(III) chloride

Answer»

Solution :`[CO(NH_(3))_(4)(H_(2)O)]Cl_(3)`
Discussion
22304.

Which will not give the usual test for iron:

Answer»

`K_2Fe_2(SO_4)_4. 24H_2O`
`(NH_4)_2Fe(SO_4)_2. 6H_2O`
`K_3[FE(CN)_6]`
`Fe_2(SO_4)_3`

ANSWER :C
Discussion
22305.

What happens when i. Hydrogen is bubbled through an aqueous solutionof sulphurdioxide . ii . Aqueousammonia in addeddropwiseto a solutionof coppersulphatetill it is in excess iii Tin intreated withconcentratednitric acid iv CrCI_(3) solutionis treatedwithsodiumhydroxide andthen withhydrogen peroxide v. Pb_(3)O_(4) is treated withnitric acid

Answer»

Solution :Sulphate is precipitate
`SO_(2) + 2H_(2)S rarr 3S + 2H_(2)O`
ii. Ammonia gives deep bluecolourwith coppersulphide due to the formation of a complex
`CaSO_(4) + 2NH_(4)OH rarr Cu(OH)_(2) + (NH_(4))_(2)SO_(4)`
`Cu(OH)_(2) + 2NH_(4)OH +(NH_(4))_(2)SO_(4) rarr underset(blue)([CA(NH_(3))_(4)])SO_(4) + 4H_(2)O`
iii. Metastamic acid ID formed
`Sn + 3HNO_(3) (conc.) rarr H_(2)SnO_(3) + 4NO_(2) + H_(2)O`
iv . A yellow solutionof sodiumchromate is PRODUCED
`H_(2)O_(2) rarr H_(2)O + O`
`2CrCI_(3) + 10NaOH + 3[O] rarr 2NaCrO_(4) + 6 NaCI + 3H_(2)O`
Leaddioxide isprecipitate
`Pb_(3)O_(4) +_ 4HNO_(3) rarr 2PB(NO_(3))_(2) 2H_(2)O + PbO_(2)`
Discussion
22306.

Which is correct in the case of [Ni(CN)_4]^(2-) complex :

Answer»

It INVOLVES `dsp^2-`hybridisation
It has SQUARE PLANAR shape
It is diamagnetic
All are correct

Answer :D
Discussion
22307.

What are essential and non - essential amino acids? Give one exmaple for each .

Answer»

Solution :Essential amino acids : the amino acids that cannot be synthesised by the body and MUST be supplied in the diet are CALLED essential amino acids.
EG: valine, leucine, phenyl alanine etc.,
NON-essential amino acids : other amino acids synthesised by the tissues of the body are called non essential amino acids.
Eg: Glycine, alanine etc.,
Discussion
22308.

What happens when an electric filed is applied to a colloidal dispersion ?

Answer»

SOLUTION :Colloidal PARTICLES MOVE towerd the oppositely charged electrode, get neutralized and COAGULATED (electrophoresis).
Discussion
22309.

Which of the following compounds will be suitable for kjeldahi's method for nitrogen estimation

Answer»




SOLUTION :NITROGEN in ANILINE is ESTIMATED by Kjedahl's METHOD.
Discussion
22310.

Which one is classified as condensation polymer?

Answer»

TEFLON
ACRYLONITRILE
DACRON
Neoprene

Answer :C
Discussion
22311.

What are ideal solutions?

Answer»

Solution :The SOLUTIONS which OBEYS Raoult.s LAW at all CONCENTRATION and TEMPERATURE are called ideal solutions.
Discussion
22312.

What are the merits and limitations of the intermediate compound theory?

Answer»

SOLUTION :MERITS:
(i) The specificity of a CATALYST
(ii) The increase in the rate of the reaction with increase in the concentration of catalyst.
Limitations:
(i) This theory fails to explain the ACTION of CATALYTIC poison and promoters.
(ii) This theory is unable to explain the mechanism of heterogeneous catalysed reactions.
Discussion
22313.

Which is the monomer of Neoprene in the following ?

Answer»

`CH_2 = UNDERSET(CL)underset(|)C - CH = CH_2`
`CH_2 = CH-C -=CH`
`CH_2 = CH - CH = CH_2`
`CH_2 = underset(CH_3)underset(|)C-CH=CH_2`

ANSWER :A
Discussion
22314.

Total number of acyclic alcohols possible for the molecular formula C_(4) H_(8) O are

Answer»

5
6
7
4

Solution :SIX, these are :
(i) `CH_(2)= CH - CH_(2)- CH_(2)` OH (STRUCTURAL ISOMER)
Discussion
22315.

Which of the following isomeric hexchlorocyclohexanes is least reactive in (beta)- dehydrochlorination of treatment with strong base

Answer»




all THREE are EQUALLY reactive

Answer :B
Discussion
22316.

The unit cell with crystallographic dimensions, a ne b ne c, alpha = gamma=90 and beta ne 90 is

Answer»

Orthorhombic
Triclinic
TETRAGONAL
Monoclinic

Answer :D
Discussion
22317.

The weakest acid among the following is :

Answer»

`CH_3COOH`
`CH_3CH_2COOH`
`(CH_3)_2CHCOOH`
`(CH_3)_3COOH`

ANSWER :D
Discussion
22318.

Which reagent is used in bromination of methoxy benzene?

Answer»

`Br_(2)` water
`Br_(2)//"ACETIC acid"`
`Br_(2)//FeBr_(3)`
`Br_(2)//CH_(3)CHO`

SOLUTION :
Discussion
22319.

The vapour pressure of the solution of two liquids A(p^(@)=80mm) and B(p^(@)=120mm) is found to be 100mm of Hg when x_(A)=0.4. The result shows that:

Answer»

SOLUTION exhibits ideal behaviour
`DeltaH_(solution)lt0`
solution shows positive DEVIATION
solution will showpositive deviation for lower CONCENTRATION and negative deviation for HIGHER concentration

Solution :`P("Total")=0.4xx80+0.6xx120=104gt100mm` of `Hg`
Discussion
22320.

When CuSO_4 is dissolved in NH_4OH solution then the correct statement is

Answer»

FREEZING POINT of SOLUTION is raised
Boiling point of solution is lowered
Freezing point of solution is lowered
Boiling point of solution is raised

Answer :A::B
Discussion
22321.

Which occurs in nature in free state ?

Answer»

Fe
Co
Ni
Pt

Answer :D
Discussion
22322.

When pt dissolved in aquaregia the complex formed is

Answer»

`PtCl_(4)`
`PtCl_(6)^(2-)`
`PtCl_(6)^(-)`
`PtCl_(4)^(-)`

Answer :B
Discussion
22323.

Which of following give haloform test?

Answer»

`CH_(3) - CHO`
`C_(2) H_(5) - CHO`
`H - CHO`
`C_(2)H_(5) - CO - C_(2) H_(5)`

ANSWER :A
Discussion
22324.

Which of the following is amphoteric oxide ? Mn_(2)O_(7), CrO_(3), Cr_(2)O_(3), CrO, V_(2)O_(5), V_(2)O_(4)

Answer»

`V_(2)O_(5), Cr_(2)O_(3)`
`Mn_(2)O_(7), CrO_(3)`
`CRO, V_(2)O_(5)`
`V_(2)O_(5), V_(2)O_(4)`

ANSWER :A
Discussion
22325.

Which of the following oxide does not give any oxyacid in aqueous solution ?

Answer»

`N_(2)O_(5)`
`Cl_(2)O_(7)`
`CrO_(3)`
`N_(2)O`

SOLUTION :`N_(2)O` is a neutral oxide
Discussion
22326.

Which of the following contains asymmetric centre

Answer»

2-butene
2,2-dimethylpropane
2-hexyne
LACTIC acid

Solution :`{:(""H),("|"),(CH_(3)-C^(**)-COOH " 2- HYDROXY PROPANOIC acid"),("|" "(lactic acid)"),(""OH):}`
Discussion
22327.

Write the formula of tetrachlorocuprate(II) ion.

Answer»

SOLUTION :`[CuCl_(4)]^(2-)`
Discussion
22328.

Which one of the following is used as an urinary antiseptic ?

Answer»

UROTROPINE
Urea FORMALDEHYDE
Formalin
Aldimin

Solution :Urotropine
Discussion
22329.

When a current of one ampere flows through a conductor for one second, the quantity of electricity passed is called

Answer»

ONE Coubomb
One Faraday
One OHM
ELECTROCHEMICAL EQUIVALENT

ANSWER :A
Discussion
22330.

We represent various reagents pictorially such that, The relative area of the squars represents the relative volume of the reagents used and the overlapping region represents the relative amount of mixing of the reagents. (Use log 5=0.7,log2=0.3,log3=0.5,d_(H_2O)=1gml^(-1)) For a solution represented by Which is/are correct?

Answer»

Ph=1
`alpha` of weak ACID =`5xx10^(-4)`
`alpha` of `H_(2)O=9xx10^(-15)`
Ph=1.7

Answer :B,c,d
Discussion
22331.

Which one of the following pairs is not correctly matched ?

Answer»

`GT C =O overset("Clemmensen's Reduction")(rarr) gt CH_(2)`
`gt C = O overset( "Wolf Kishner Reduction ")( rarr) gt CHOH`
`-COCl overset( "ROSENMUND's Reduction")(rarr)-CHO`
`-C-= Noverset( "STEPHAN's Reduction")(rarr) -CHO`

Answer :B
Discussion
22332.

Which one of the following is not an example for first order reaction ?

Answer»

`N_2O_(5(G))rarr2NO_(2_((g)))1/2O_(2(g))`
`SO_2Cl_(2(l))rarrSO_(2(g))+Cl_(2(g))`
`H_2O_(2(aq))rarrH_2O_((l))1/2O_(2(g))`
`CH_3CHO_((g))rarrCH_(4_(g))+CO_((g))`

ANSWER :D
Discussion
22333.

Tincal is:

Answer»

`Na_2CO_3. 10H_2O`
`NaNO_3`
`Na_2B_4O_7. 10H_2O`
NaCl

Answer :C
Discussion
22334.

Whichof the following are optically active compounds -

Answer»




ANSWER :B::C
Discussion
22335.

Which of the following enzymes can hydrolyse urea into CO_2 and NH_3

Answer»

Amylase
Urease
Lipase
Zymase

Answer :B
Discussion
22336.

Which one of the following is used as a disinfectant in water treatment

Answer»

ALUM
Charcoal
Kieselguhr
Potassium permanganate

Answer :D
Discussion
22337.

What are the uses of phosphine ?

Answer»

Solution :The uses of phosphine are as follows :
(1) It is used in the preparationof organophosphorus compounds.
(2) It is a powerful reducing AGENT.
(3) It is used to prepare smoke screens.
(4) Phosphine is used in the preparation of Holme's signals in combination with acetylene `C_(2)H_(2)`. holme's signals are used for SHIPS to KNOW about the positioons of ROCKS in the sea.
Discussion
22338.

Which reaction indicates the oxidising behaviour of H_(2) SO_(4)

Answer»

`2HI + H_(2) SO_(4) to I_(2) + SO_(2) + 2H_(2) O`
`2 NaOH + H_(2) SO_(4) to Na_(2)S O_(4) + 2H_(2) O`
`NaCl + H_(2) SO_(4) to NaHSO_(4) + HCL`
`2PCl_(5) + H_(2) SO_(4) to 2 POCl_(3) + 2 HCl + SO_(2) Cl_(2)`

ANSWER :A
Discussion
22339.

What type of flame is employed to perform the flame test? How is it obtained?

Answer»

Solution :A non-luminous FLAME is employed to perform the test. It is obtained by KEEPING the holes the burner open.
Discussion
22340.

Total charge required for the oxidation of two moles Mn_3O_4 intoMnO_4^(2-)in presence of alķaline medium is 2.0 xx 10^(x), x is

Answer»


Solution :`Mn_3O_4 overset(OH^(-))to MnO_4^(-2)`
` +(8)/(3) ""+6`
charge in oxidation state =` 6 -(8)/(3)`
For 3 Mn atoms `=3[6-(8)/(3)] = 10`
For 1 mole = 10
For 2 MOLES =` 2 XX 10 = 20 = 2 xx 10^(1) , x =1`
Discussion
22341.

Which of the following is a disaccharide:

Answer»

Lactose
Starch
Cellulose
Fructose

Answer :A
Discussion
22342.

Which of the following is an example for gel?

Answer»

PUMICE STONE
Pearls
Coloured glass
BUTTER

SOLUTION :Butter
Discussion
22343.

Whichisthe nitrogen base presentonly in RNA butnot in DNA ?

Answer»

URACIL
THYMINE
GUANINE
ADENINE.

ANSWER :A
Discussion
22344.

Which among the followingcompounds is NOT obtained when Ca-acetate and Ca-propionate mixture is dry distilled ?

Answer»

Acetone
Diethyl ketone
Ethyl METHYL ketone
Acetaldehyde

Answer :D
Discussion
22345.

Which of the following is a common antacid ?

Answer»

NaOH
KOH
`MG(OH)_(2)`
HCl

Answer :B::C
Discussion
22346.

The solution of 6.8 gram non-ionic substance in 100 ram water is freezed at - 0.93^(@)C. What is the molar mass of unknown substance ?(K_(f)=1.86)

Answer»

34
136
68
`13.6`

Solution :`M=(K_(F)xx W xx 1000)/(Delta T_(f)xx w_(A))=(1.86xx6.8xx1000)/(0.93xx100)`
= 136 gram/mole.
Discussion
22347.

Which one of the following characteristics is associated with adsorption ?

Answer»

`DeltaG and DeltaH` are NEGATIVE but `DeltaS` is positive
`DeltaG and DeltaS` are negative but `DeltaH` is positive
`DeltaG` is negative but `DeltaHand DeltaS` are positive
`DeltaG, DeltaHand DeltaS` all are negative

Solution :As the MOLECULES of the adsorbate are held on the SURFACE of the solid ADSORBENT, netropy decreases, i.e., `DeltaS` is -ve.
As adsorption is a spontaneous process, `DeltaG=-ve.`
Now as `DeltaG=DeltaH-T DeltaS` is -ve, `DeltaG` can be-ve only if `DeltaH` is -ve.
Discussion
22348.

whichof thefollowingis afirstorderreaction ?

Answer»

`2H_(2)O _(2(aq))overset(pt)to2H_(2)O+O_(2(g))`
`2HI toH_(2)+I_(2)`
`2NO_(2) to2NO+O_(2)`
`2NO+O_(2) to2NO_(2)`

ANSWER :A
Discussion
22349.

What is the unit of magnetic moment ?

Answer»

SOLUTION :BOHR MAGNETON
Discussion
22350.

Write the formula of the following (i) 4-Methylpent-3-en-2-one (ii) 2-Ethoxy-4-methoxypentan-3-one

Answer»

SOLUTION :(i) `(CH_(3))_(2)C=CHCOCH_(3)` (ii) `CH_(3)-CH(OCH_(3))-CO-CH(OCH_(2)CH_(3))CH_(3)`.
Discussion