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12001.

Which of the following compounds will give methyl organe by the reaction with give methyl organe by the reaction with diazonium salt of sodium p-amino benzene sulphonate ?

Answer»

ANILINE
`N, N-`DIMETHYL aniline
`m-` NITRO aniline
`m-`bromophenol

Solution :
Discussion
12002.

Which of the following will evolve CO_(2) on reaction with NaHCO_(3) ?

Answer»

Salicylic ACID
Picric acid
Benzoic acid
4-Nitrobenzoic acid

Solution :Stong acids on REACT with `NaHCO_(3)` gives `CO_(2)` gas
Discussion
12003.

Which one of the following relationships is correct for cubic (C) and rhombohedral (R) unit cells ?

Answer»

`C a ne B ne c, alpha=beta=gamma `
`R:a=b=c,alpha=beta=gamma=90^(@)`
`C a = b =c, alpha ne beta ne gamma `
`R:a ne b ne c,alpha=beta=gamma=90^(@)`
`C a =b = c, alpha=beta=gamma `
`R:a=b ne c,alpha= beta=gamma=90^(@)`
`C a =b = c, alpha=beta=gamma `
`R:a=b ne c,alpha= beta=gamma ne 90^(@)`

ANSWER :D
Discussion
12004.

Which of the following is biodegradable polymer?

Answer»

PHBV
Nylon-6
Polyethene
Nylon-6, 10

Answer :A
Discussion
12005.

What is the reaction of conc. H_2SO_4with (i) Sulphur (ii) Carbon ?

Answer»

SOLUTION :(i) `S + 2H_2SO-4 (CONC) to 3SO_2 + 2H_2O `
(II) ` C + 2H_2SO_4 (conc) to CO_2 + 2SO_2 + 2H_2O`
Discussion
12006.

The source of Folic acid si

Answer»

YEAST
SPINACH leaf
Liver of OX
all the above

Answer :B
Discussion
12007.

Whichoneamongthe followingpairs of ionscannot besepratedby H_(2)Sin dilate HCI ?

Answer»

`AI^(3+), Hg^(2+)`
`Zn^(2+), Cu^(2+)`
`Bi^(3+), SN^(4+)`
`NI^(3+), Cu^(2+)`

ANSWER :c
Discussion
12008.

Which of the following is the Lewis structure of O_2 molecule?

Answer»




ANSWER :B
Discussion
12009.

Write two differences between ideal and non-ideal solutions.

Answer»

SOLUTION :
Discussion
12010.

What mass of ethylene glycol (molar mass = 62.0 g mol^(-1) ) must be added to 5.50 kg of water to lower the freezing point of water from 0^(@)Cto - 10.0^(@) C ? (K_(f) "for water " = 1.86 k " kg mol"^(-1))

Answer»

Solution :`W_(B)= ?, M_(B) = 62 , W_(A) = 5.50 G `
`Delta T_(f) = 10^(@) C, K_(f) = 1.86`
`Delta T_(f) = K_(f) xx (W_(B))/(M_(B) xx W_(A))`
10 = `1.86 xx (W_(B))/(62 xx 5.50) `
3410 = 1.86`W_(B)`
`W_(B) = ` 1833.3 = 1.833 KG
Discussion
12011.

Zirconium can be refined by using....

Answer»

Zone refining 
Van Arkel method 
Mond carbonyl PROCESS 
Liquation 

SOLUTION :`underset(("Impure"))underset("ZIRCONIUM")(Zr_(s)) + undeset("Iodine")(2I_(2(g))) underset("Evacuated vessel")overset(DELTA)(rarr) underset("Pure")(ZrI_(4(g)))`
`underset("Pure")(ZrI_(4(g))) underset("TUNGSTEN filament")overset(1800 K)(rarr) underset("Pure")(Zr_(s)) + underset("Iodine")(2I_(2(g)))`
Discussion
12012.

Which of the following is/are correct order :- (A)Thermal stability = BeSO4 lt MgSO_4 lt CaSO_4 lt SrSO_4 (B) Melting point = NaCl > KCl > RbCl > CsCl (C) Solubility = LiOH < NaOH (D) Lattice energy = KF > KCl > KBr > KI

Answer»

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

ANSWER :D
Discussion
12013.

This vitamin is available to vegetarians:

Answer»

A
`B_(12)`
`B_(2)`
`C

Answer :B
Discussion
12014.

What is industrial name of H_2S_2O_7 ?

Answer»

Pyrosulphuric ACID
Marshall's acid
Olium
(A), (B) and (C) all THREE

ANSWER :D
Discussion
12015.

When 0.1 mol MnO_(4)^(2-) is oxidized, the quantity of electricity required to cmpletely oxidize MnO_(4)^(2-) to MnO_(4)^(-) is

Answer»

96500 C
`2xx96500C`
`9650C`
`96.50C`

Solution :The OXIDATION REACTION is
`MnO_(4)^(2-)toMnO_(4)^(-)+e^(-)`
1 mol of `MnO_(4)^(2-)` for oxidation requires electricity=1F=96500C
`therefore0.1` mol of `MnO_(4)^(2-)` will REQUIRE electricity =9650C
Discussion
12016.

What is the atomic number of noble gas that reacts with F2

Answer»

10
2
18
54

Answer :D
Discussion
12017.

Which of the following arrangements show the schematic alignment of magnetic moments of antiferromagnetic substance ?

Answer»

`{:(UARR, DARR, darr, darr, darr, uarr):}`
`{:(uarr, uarr, uarr, uarr, uarr, uarr):}`
`{:(uarr , uarr, darr, uarr, uarr, darr):}`
`{:(uarr, darr, uarr, darr, uarr, darr):}`

ANSWER :D
Discussion
12018.

Which of the following statement is incorrect:

Answer»

Enzmes are in coooidal state
Enzymes are catalyst
Enzymes can CATALYSE any reaction
Urease is an enzyme

Answer :C
Discussion
12019.

Which does not contain carbohydrate :

Answer»

CELLULOSE
WAX
STARCH
WHEAT flour

Answer :B
Discussion
12020.

Write the formula of the following coordination compound Ammine bromidochloridonitrito-N-platinate(II)

Answer»

SOLUTION :`[PT(NH_3)BRCL(NO_2)]^-`
Discussion
12021.

Which of the following compounds will not give iodioformon treatment with alkaliand iodine

Answer»

acetone
ETHANOL
diethyl KETONE
isopropyl alcohol

ANSWER :C
Discussion
12022.

Which one of the following statements 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 inversely proportional to the temperature of the solution.

Answer :C::D
Discussion
12023.

Which of thefollowingreactionwill notgive name

Answer»

`R- X+ NH_(3)`
`R- CH= N - OH + Na + ` alcohol
`R- CN + H_(2) O`
`R-CN + H_(2)`

ANSWER :C
Discussion
12024.

Which one of the following is used as a general anaesthetic in place of diethyl ether ?

Answer»

Chloroform
`CF_(3)-CHClBr`
`CF_(3)-CHBr_(2)`
None

Solution :HALOTHANE, `CF_(3)-CHClBr`.
Discussion
12025.

What is a semiconductior ? Give names the two main types of Semi-conductors ?

Answer»

SOLUTION :Semiconductor : A meterial whose electrical conductivity is of the order of `10^(-9) - 10^(2) ohm^(-1) cm^(-1)` is CALLED a semiconductor. It allows flow of current only in one direction.
There are two TYPES of SEMICONDUCTORS :
(i) p-type semiconductor, (ii) n-type semiconductor.
Discussion
12026.

What are reactions involved in removing SO_(2) from the atmosphere by passing it through a solution containing citrate ions ?

Answer»

Solution :`SO_(2) + H_(2)O HARR HSO_(3)^(-) + H^(+)`
`HSO_(3)^(-) + H_(2)cit^(-) underset("COMPLEX")to (HSO_(3).H_(2)cit)^(2-)`
Discussion
12027.

What are ionic solids ? Give their charaeteristics.

Answer»

Solution :(i) The structural units of an ionic crystals are cations and anions. They are bound together by strong ELECTROSTATIC attractive forces.
(II) To maximize the attractive force, cations are surrounded by as many anions as possible and vice versa.
(iii) lonic crystals possess definite crystals STRUCTURE.
(iv) Many solids are cubic close packed.
Characteristics
(i) Ionic solids have high melting points.
(ii) These solids do not conduct electricity, because the ions are fixed in their lattice positions.
(iii) They do not conduct electricity in molten state (or) when dissolved in water, because the ions are free to MOVE in the molten state or solution.
(v) They are hard as only strong external force can change the relative positions of ions.
(vi) Example .,The amangement of `NA^(+) and CI^(-)` ions in NaCl crystal.
Discussion
12028.

Which of the following have same geometry -

Answer»

`SbF_(5)^(2-), XeF_(5)^(-), IF_(5)`
`SF_(4), XeOF_(4), PCl_(4)^(+)`
`SF_(6), PF_(6)^(-), IOF_(5)`
`COCl_(2), SOCl_(2), XeOF_(2)`

ANSWER :C
Discussion
12029.

There is an ozone layer at a height of about 29 kilometres above the surface of the earth. Which of the following statements is true:

Answer»

It is HARMFUL because ozone is dangerous to LIVING organisms
It is beneficial because OXIDATION REACTIONS can proceed faster in the presence of ozone.
It is beneficial because ozone cuts out the ultraviolet radiation of the sun
It is harmful because ozone cuts out the important RADIATIONS of the sun which are vital for photosynthesis

Answer :C
Discussion
12030.

The vapour pressure of an aqueous solution of cane sugar (mol. Mass = 342) is 732 mm at 100^(@)C. Calculate the boiling point of the solution (K_(b) for water =0.52^(@)C).

Answer»


SOLUTION :`p_(0)=760MM, p_(s)=732mm." First apply "(p_(0)-p_(s))/(p_(0))=(n_(2))/(n_(1))=(n_(2))/(1000//81)""("taking "w_(1)=1000g)`
`n_(2)="MOLALITY (m)"`
`"Apply"DeltaT_(b)=K_(b)xxm`.
Discussion
12031.

The unshared electrons on the oxygen atom on an ether (basic centre) account for all the following except:

Answer»

Combination LIKE,
Formation of OXONIUM SALTS with ACIDS such as
Formation of peroxides (EXPLOSIVE)
Chemical inactivity of ether

Answer :D
Discussion
12032.

What is depression of freezing point ? Explain.

Answer»

SOLUTION :The freezing poiunt of a substance may be DEFINED as the temperature at which the vapour pressure of the substance in its liquid PHASE is equal to its vapour pressure in the SOLID phase.
At any temperature the vapour pressure of solution is lower than that of PURE solvent. The lowering of freezing point in solution as compared to solvent is known as depression of frezing point.
Discussion
12033.

Which one of the following statements is correct with respect to basic character ?

Answer»

<P>`PH_3 GT P(CH_3)_3`
`PH_3 = NH_3`
`PH_3 gt NH_3`
`P(CH_3)_3 gt PH_3`

ANSWER :D
Discussion
12034.

The resistance of a conductivity cell containing 0.001 M KCl solution at 298K is 1500 Omega. What is the cell constant if conductivity of 0.001 M KCl solution at 298K is 0.146xx10^(-3)"S "cm^(-1)?

Answer»

SOLUTION :CELL constant`=("Conductivity")/("CONDUCTANCE")=`Conductivity`XX`RESISTANCE=(0.146`xx10^(-3)`) S `cm^(-1)xx1500Omega`
`=0.219cm^(-1)`
Discussion
12035.

Which of the following mixtures of ions in solution can be separated by using an NH_(3) solution

Answer»

`Hg_(2)^(2+)` and `Ag^(+)`
`BI^(3+)` and `Cu^(2+)`
`Ag^(+)` and `Pb^(2+)`
`Cu^(2+)` and `Cd^(2+)`

SOLUTION :Either due to FORMATION of different colour precipitates (or) due to SOLUBILITY of one of resultant COMPLEX
Discussion
12036.

Which of the following does not occur?

Answer»

`_(20)^(40)Ca+_(0)^(1)n rarr _(19)^(40)K+_(1)^(1)H`
`_(12)^(24)MG+_(2)^(4)He rarr _(14)^(27)Si +_(0)^(1)n`
`_(48)^(113)CD+_(0)^(1)n rarr_(48)^(112)Cd+_(-1)^(0)e`
`_(20)^(43)Ca+_(2)^(4)He rarr_(21)^(46)Sc+_(1)^(1)H`

Answer :C
Discussion
12037.

Which of the following compound is used for preparation of melamine formaldehyde polymer ?

Answer»




ANSWER :C
Discussion
12038.

Which of the following sequence is correct for solubility in H_(2)O? (1) BeSO_(4)gtMgSO_(4)gtCaSO_(4)gtBaSO_(4) (2) Be(OH)_(2)gtMg(OH)_(2)gtCa(OH)gtBa(OH)_(2) (3) Li_(2)CO_(3)lt NaOH lt KOHltRbOH (4) LicO_(3)ltNa_(2)CO_(3)ltK_(2)CO_(3)ltRCO_(3)

Answer»

`1,3,4`
`1,2,4`
`2,4,`
`1,3,4`

Solution :USE CONCEPT of LATTICE ENERGY & hydration energy.
Discussion
12039.

The regents A and B in the reaction sequence are given by the set:-

Answer»

ISOPROPYL ALCOHOL, HYDRAZINE
Isopropyl alcohol, HYDROXYLAMINE
t-butyl alcohol, hydrazine
t-butyl alcohol, hydroxylamine

Answer :C
Discussion
12040.

The Zn acts as sacrificial or cathodic protection to prevent rusting of iron because :

Answer»

`E_(OP)^(@)of Zn lt E_(OP)^(@)` of FE
`E_(OP)^(@) of Zn GT E_(OP)^(@)` of Fe
`E_(OP)^(@) of Zn = E_(OP)^(@) of `Fe
Zn is cheaper than IRON

Answer :B
Discussion
12041.

The relationship between equivalent conductance (A_(eq)), specific conductivity (K) and normality (xN) of a solution is:

Answer»

`K=(1000xx x)/(wedge_(eq))`
`wedge_(eq)=(1000xx k)/x`
`wedge_(eq)=k/(1000xx x)`
`k=(wedge_(eq))/(1000xx x)`

ANSWER :B
Discussion
12042.

What is Silver mirror test ?

Answer»

Solution :Reduction of `AG^+` IONS, PROVIDED by Tollen.s reagent to SILVER metal is known as silver mirror test.
Discussion
12043.

What type of substances enhance the activity of a catalyst for the reactions ?

Answer»

SOLUTION : PROMOTERS
Discussion
12044.

Which of the following represents structure of melamine?

Answer»




ANSWER :D
Discussion
12045.

What is the potential of the cell containing two hydrogen electrodes as represented below ? Pt | (1)/(2) H_(2) (g) | H^(+) (10^(-8)M) ||H^(+) (0.001M) | (1)/(2) H_(2) (g) | Pt

Answer»

`-0.295` V
`-0.0591` V
0.295
0.0591 V

Solution :`E_(cell) = (0.0592)/(1) log ([H^(+)]_(RHS))/([H^(+)]_(LHS))`
` = 0.0592 log_(10) (10^(-3))/(10^(-8)) = 0.0592 xx 5 = 0.295` V
Discussion
12046.

When CuSO_(4) is hydrated, then it becomes

Answer»

Acidic
Basic
Neutral
Amphoteric

Answer :D
Discussion
12047.

Which one of the following is the best method to prepare alkyl aryl ketone and diaryl Ketones?

Answer»

STEPHEN REACTION
Knoevengal reaction
Clemmenson reduction
Friedel CRAFTS reaction

SOLUTION : Friedel crafts reaction
Discussion
12048.

Thermite process is quite useful for repairing broken parts of machines . Explain.

Answer»

Solution :In the thermite process, oxides of metals LIKE iron are reduced by aluminium. This reaction is highly exothermic and a large amount of heat is evolved during the reaction. As a result of large heat, the metal will be the molten state. For example
`underset("Iron OXIDE")(Fe_2 O_3) + 2AL(s) overset("Heat")to Al_2 O_3 (s) + underset("Molten")(2Fe +"Heat")`
If the molten metal is allowed to fall between the broken PARTS of a MACHINE, the gaps will be filled up. Therefore, the machine will be repaired.
Discussion
12049.

Which of the following is not a peroxy acid?

Answer»

Perphosphoric Acid
Pernitric Acid
Perdisulphuric Acid
Perchloric Acid

Answer :D
Discussion
12050.

What is % of carbon in cast iron and in steel ?

Answer»

SOLUTION :Cast IRON `RARR`2 to `2.5%`
STEEL `rarr` 0.1 to `1.5%`
Discussion