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16351.

x gram of CaCO_(3) was completely burnt in air. The mass of the solid residue formed is 28g. What is the value of 'x' in gram?

Answer»

44
200
150
50

Solution :`CaCO_(3)(s)rarrCaO(s)+CO_(2)(g)`
100G 56G
56g residue `=100g CaCO_(3)`
`therefore 28G ` residue=50 g `CaCO_(3)`
Discussion
16352.

When a salt is heated with dil. H_2 SO_4 and KMnO_4 solution, the pink colour of KMnO_4 is discharged, the mixture contains

Answer»

sulphite
corbonate
nitrate
bicarbonate

Solution :`SO_(3)^(2-)` reduces `KMnO_(4)` and COLOUR of `KMnO_(4)` is discharged
`5SO_(3)^(2-) +2MnO_(4)^(-) + 6H^(+) to 2Mn^(2+) +5SO_(4)^(2-) +3H_(2)O`
Discussion
16353.

The substance used as an adsorbent in the column choromatography is:

Answer»

`Na_2O`
`Na_2SO_4`
`AI_2O_3`
Alum

Answer :C
Discussion
16354.

Which is the least pure form of carbon:

Answer»

Graphite
Lamp black
Wood charcoal
Animal charcoal

Answer :D
Discussion
16355.

Theregents andconditonstoconvertmethyliodidetomethaneare :

Answer»

action of DRY`Ag_(2)O`
KCN followedby refluxingwithdil HCI
aqueousNaOHfollowedbyboiling`Al_(2)O_(3)` at 640K
Mg in dry ETHER followedby boilingwithwater

Answer :D
Discussion
16356.

The slowest step of a particular reaction is found to be 1/2X_(2)+Y_(2)toXY_(2) the order of the reaction is

Answer»

`2`
`3`
`3.5`
`1.5`

ANSWER :D
Discussion
16357.

Write the half cell reaction of the above cell.

Answer»

SOLUTION :At ANODE :`CutoCu^(+2)+2E^_`
At CATHODE :`2Ag^++2e^-to2Ag`
Discussion
16358.

While Fe^(3+) is stable, Mn^(2+) is not stable in acid solution because.

Answer»

`O_(2)` OXIDES `MN^(2+)` to `Mn^(3+)`
`O_(2) ` OXIDISES both `Mn^(2+)` to `Mn^(3+)` and `Fe^(2+)` to `Fe^(3+)`
`FE^(3+)` oxidizes `H_(2)O` to `O_(2)`
`Mn^(3+)` oxidizes `H_(2)O` to `O_(2)`

Solution :Reaction of `M N^(3+)` with `H_2O` is sponteneous.
Discussion
16359.

Which of the following structures correspond to the product expected, when excess of C_6H_6 reacts with CH_2Cl_2 in presence of anhydrous AlCl_3

Answer»




SOLUTION :
Discussion
16360.

Which among the following is an acidic buffer?

Answer»

`CH_3COOH + HCI`
`CH_3COOH + CH_3COONa`
`HCI + H_2SO_4`
`NH_4OH + NAOH`

ANSWER :3
Discussion
16361.

Tranquillizers are substances used for the treatment of :

Answer»

AIDS
Cancer
Mantal diseases
Physical disorders

Solution :"TRANQUILLISERS" are medicines USED to treat mental diseases. They are called PSYCHOTHERAPEUTIC DRUGS.
Discussion
16362.

Which statements are correct about the reactions? D-Glucose overset(NaCN//HCN)(rarr)products.

Answer»

The C chain is increased by one C atom.
Two ISOMERIC productsm, cyanohydrin and its C-2 epimeric cyanohydrin are formed.
Epimers formed in products are in unequal amounts.
The PRESENCE of stereocentres in SUGARS cause their `(C=O)` groups to have diastereotopic faces that react at DIFFERENT rates, giving different amounts of diasteremers.

Answer :A::B::C::D
Discussion
16363.

Which one of the following alkaness has 75% of carbon?

Answer»

`C_(2)H_(6)`
`CH_(4)`
`C_(3)H_(8)`
`C_(4)H_(10)`

Solution :PERCENTAGE of carbon in methane 1=(12)/(16)xx100=75%`
Discussion
16364.

Write the name and structure of the monomer units of butyl rubber.

Answer»

SOLUTION :The monomer UNITS units of butyl rubber : Isobutylene `CH_(2)=overset(CH_(3))overset("|")"C "-CH_(3)` and ISOPRENE `CH_(2)=overset(CH_(3))overset("|")"C"-CH=CH_(2)`
Discussion
16365.

Which one of the following about CH_(2)SF_(4) and SF_(4)SOF_(4), OCF_(2) molecules is/are incorrect?

Answer»

Equitorial FSF bond angle in `SOF_(4)` will be less then in `SF_(4)` molecule
The two HYDROGENS, CARBON, sulphur and two flourines of equatorial position in molecule `CH_(2)SF_(4)` will be lying in the same plane.
The AXIAL FSF bond angle in `SF_(4)~~180^(@)`
The bond angle FCO will be `lt 120^(@)` in molecule `OCF_(2)`

Answer :A::B
Discussion
16366.

Which of the following is soapless soap

Answer»

SODIUM stearate
sodium palmelate
sodium Lalurate
sodium dodecy BENZENE sulphonate

Answer :D
Discussion
16367.

When glycerol is treated with a mixture of excess of conc. HNO_3 and H_2SO_4 the compound formed is :

Answer»

GLYCEROL mononitrate
Glycerol dinitrate
Glycerol trinitrate
Acrolein

Answer :C
Discussion
16368.

What are drugs?

Answer»

Solution :Drugs are the CHEMICAL compounds which CURE the DISEASE but are habit forming.
Discussion
16369.

What volume of hydrogen gas at 273 K and 1 atm pressure will be consumed in obtaining 21.6 g elemental boron (atomic mass = 10.8) from the reduction of boron trichloride by hydrogen?

Answer»

67.2 L
44.8 L
22.4 L
89.6 L

Solution :`2BCl_(3) + UNDERSET(3 XX 22.4 L= 67.2 L)(3H_(2)) to underset(2 xx 10.8 g= 21.6 g)(2B) + 6HCL`
Discussion
16370.

Which of the following species is most stable?

Answer»

`p-O_(2)N-C_(6)H_(4)- overset(+)CH_(2)`
`C_(6)H_(4)- overset(+)CH_(2)`
`p-CI -C_(6)H_(4)- overset(+)CH_(2)`
`p-CH_(3)O-C_(6)H_(4)- overset(+)CH_(2)`

Solution :positive charge on `- overset(+)CH_(2)` is dispersed due to elecytron repelling nature of METHOXY group. HENCE (D) is the correct answer.
Discussion
16371.

Write the factor upon which the catalytic reaction ofshape -selective cata -lyst depends ?

Answer»

Solution :(a) Pore STRUCTURE of the catalyst.
(B) SIZE and shape of the reactant and PRODUCT molecules.
Discussion
16372.

Which of the following nucleophile is generally not introduced in the benzene ring by sandmeyer reaction ?

Answer»

`CL^-`
`Br^-`
`CN^-`
`I^-`

Solution :Sandmeyer reaction is USEN for the preparation of chlorobenzene, bromobenzene and benzonitrile
Discussion
16373.

What is the geometrical shape of XeO_3 ?

Answer»

PLANAR TRIANGULAR
TRIGONAL pyramidal
Square planar
Tetrahydral

ANSWER :B
Discussion
16374.

This adsorption is irreversible

Answer»

VANDERWAAL's adsorption
Physical adsorption
Chemical adsorption
All the above

Answer :C
Discussion
16375.

Write the final product in the following reactions:

Answer»

SOLUTION :
Discussion
16376.

Tollen's reagent can be obtained by mixing aqueous AgNO_3 with aqueous NH_3 solution. The reagent mainly contains

Answer»

`[AG(NH_3)_2]^(+)`
AgOH
Ag
`CH_3CHO`

ANSWER :A
Discussion
16377.

Which is correct in the case of [NiCl_4]^(2-) complex:

Answer»

`sp^3`hybrahedral
Paramagnetic
Tbtrahedral
All are correct

Answer :D
Discussion
16378.

What is thew name of first effective antibacterial agent ?

Answer»

SOLUTION :PRONTOSIL
Discussion
16379.

Which of the following statement is not correct for the catalyst ?

Answer»

It CATALYSES the forward and backward reaction to the same extent
It alters `DeltaG` of the reaction
It is a substance that does not change the equilibrium CONSTANT of a reaction
It provides an ALTERNATE mechanism by reducing activation energy between reactants and products.

Solution :Presence of catalyst does not change `DeltaG` or `DeltaH` VALUE. Hence, (B) is not correct.
Discussion
16380.

Which of the following have covalent, coordinate and ionic all three type of bonds:- (a) NH_(4)Cl (b) KNO_(3) (c) K_(3)[Fe(CN)_(6)] (d) H_(2)CO_(3)

Answer»

Only c
B and d only
a,b and c
a,b,c and d

Answer :C
Discussion
16381.

Two liquids A and B boil at 125^(@)C and 146^(@)C respectively. Liquid A will have higher vapour pressure.

Answer»


ANSWER :1
Discussion
16382.

What is oxidation state and coordination number of central metal ion in (a) (NH_(4))[CoF_(4)] ? (b) [Pt(O_(2))(en)_(2)Br]^(+)

Answer»

Solution :(a) `[overset(x-1)[CoF_(4))]^(2-)`, x-4=-2 or x=+2, COORDINATION no. =4.
(b) `O_(2)^(2-)` (peroxo) is MONODENTATE, en is didentate and `Br^(-)` is monodentate. Hence, coordination no. =1+4+1=6.
`[overset(x)(Pt)(O_(2))^(2-)overset(0)((en))_(2)Br^(-)]^(+)`, x-2-1=+1or x=4
Discussion
16383.

Which is used for making rayon (artificial silk) :

Answer»

Starch
CELLULOSE
Terephthalic acid
ADIPIC acid

ANSWER :B
Discussion
16384.

Which one of the following is an example for antihypertensive drug?

Answer»

atenolol
amoxicillin
cefixime
tetracycline

Solution :atenolol
Discussion
16385.

Which blue liquid is obtained on reacting equi molar amounts of two gases at-30^@C ?

Answer»

`N_2O`
`N_2O_3`
`N_2O_4`
`N_2O_5`

Solution :`NO_((a))+NO_(2(a))overset(-30^@C)rarrunderset("BLUE LIQUID")(N_2O_3(1))`
Discussion
16386.

Which of the following compoundson reaction with methyl megnesium bromide will give tertiary alcohol.

Answer»

benzaldehyde
PROPANOIC acid
METHYL propanoate
ACETALDEHYDE

SOLUTION :
Discussion
16387.

Which of the following is acrolein ?

Answer»

`CH_(3) -CH =CH-CHO`
`CH_(3) = CH - CHO`
`CH_(2)=CH-CH_(2) -CHO`
`CH_(2) =CH-CH_(2)-CH_(2)-CHO`

Answer :B
Discussion
16388.

Which analgesics are called opiates ?

Answer»

Solution :Narcotic analgesics which are obtained from OPIUM POPPY are called opiates. EXAMPLES are MORPHINE and its derivations LIKE heroin and codeine.
Discussion
16389.

Which of the following reaction is not a part of the Godschmidt aluminothermic process

Answer»

`Fe_(2)O_(3)+2Al to Al_(2)O_(3)+2FE`
`Cr_(2)O_(3)+2Al to Al_(2)O_(3) +2Cr`
`3Mn_(3)O_(4) +8Al to 4Al_(2) O_(3) +9Mn`
`3ZnO+2Al to Al_(2)O_(3) +3ZN`

Solution :The formation of zinc metal is not included in aluminothermic process.
Discussion
16390.

Which one of the following complexes is not expected to exhibit isomerism?

Answer»

`[Ni(NH_(3))_(4)(H_(2)O)_(2)]^(2+)`
`[Pt(NH_(3))_(2)cl_(2)]`
`[CO(NH_(3))_(5)SO_(4)]Cl`
`[Fe(en)_(3)]^(3+)`

ANSWER :C::D
Discussion
16391.

The shape of XeF_6molecule is :-

Answer»

OCTAHEDRAL
Distarted octohedral
Pentagonalbipyamidal
SQUARE PYRAMIDAL

ANSWER :C
Discussion
16392.

Which of the following is methanides ?

Answer»

`Be_2C`
`Al_4C_3`
`Mg_2C_3`
Both (a) and (B)

ANSWER :D
Discussion
16393.

The vapour pressure of benzene at 80^@C is 750 mm. The molecular weight of the substance will be:

Answer»

15
150
1500
148

Answer :D
Discussion
16394.

Which of the following complexes are low spin diamagnetic ? (P) K_(4)[Os(CN)_(6)]""(Q) [Mo(CO)_(6)] [Mn(CN)_(6)]^(4-) select the correct answer using the codes given below :

Answer»

<P>P, Q and R
P and Q only
P and R only
Q and R only

Solution :[Mn `(CN)_(6)]^(4-) , d^(5) , t_(2 g)^(2 ,2 , 1) eg^(0 , 0)` has 1 UNPAIRED `e^(-)`
Discussion
16395.

Which metal is used as a coating on steel to prevent corrosion where the cell reactions are:-

Answer»

Fe is oxidised to `Fe^(2+)` and issolved OXYGEN oxygen in water is reduced to `overset(Ө)(O)H`
Fe is oxidised to `Fe^(3+) and H_(2)O` is reduced to `O_(2)^(2-)`
Fe is oxidised to `Fe^(2+) and H_(2)O` is reduced to `O_(2)^(-)`
Fe is oxidised to `Fe^(2+) and H_(2)O` is reduced to `O_(2)`

Solution :`FetoFe^(2+)+2e^(-)` (anode reaction)
`O_(2)+2H_(2)O+4e^(-)to4OH^(-)` (cathode reaction) ltbgt The overall reaction is:-
`2Fe+O_(2)+2H_(2)Oto2FE(OH)_(2)`
`Fe(OH)_(2)` MAY be dehydrated to iron OXIDE FeO, or further oxidized to `Fe(OH)_(3)` and then dehydrate to iron RUST, `Fe_(2)O_(3)`.
Discussion
16396.

Who proved that in proteins the amino acids are linked together by peptide linkage ?

Answer»

EMIL Fisher
Cannizzaro
Kekul
Hoffman

Answer :A
Discussion
16397.

Which reagent can be used to estimate Ni^(2+) ions ?

Answer»

dmg
EDTA
Py
`CN^(-)`

ANSWER :A
Discussion
16398.

What is transesterification? Explain with example.

Answer»

Solution :Esters of an alcohol can react with another alcohol in the presence of a mineral acid to give the ester of SECOND alcohol. The interchange of alcohol PORTIONS of the esters is TERMED transesterification.
`underset("ethyl acetate")(CH_3 - undersetoverset(||)(O)(C ) - OC_2H_5) + underset("propyl alcohol")(HOC_3H_7)overset(H^(+))(IFF) underset("propyl acetate ")(CH_3 - undersetoverset(||)(O)(C )- OC_3H_7 ) + underset("ethanol")(C_2H_5OH)`
Discussion
16399.

Which of the following defines the term opiates?

Answer»

Narcotic ANALGESICS obtained from the oprium POPPY.
Non-narcotic analgesics which REDUCE fever.
Narcotic drugs that inhibit pathogenic MICROBES .
Tranquilizersused to induce sleep .

Solution :Morphine narcotics aresometimesreferred to as opiates , SINCE they are obtained from the opium poppy.
Discussion
16400.

The synthesis of PhOH from PhCl is called

Answer»

CUMENE process
Dow's process
Williamson's synthesis
Wurtz synthesis

Answer :B
Discussion