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10051.

The volumeof 20 g oh H_2 at STP is :

Answer»

224 litre
22.4 litres
2.24 litre
112 litre

Answer :A
Discussion
10052.

XY_(2) dissociates XY_(2)(g) hArr XY(g)+Y(g). When the initial pressure of XY_(2) is 600 mm Hg, the total equilibrium pressure is 800 mm Hg. Calculate K for the reaction Assuming that the volume of the system remains unchanged.

Answer»

50
`100.0`
`166.6`
`400.0`

Solution :`XY_(2)hArrXY+Y`
Initial PRESSURE of `XY_(2)=600mm Hg` ACCORDING to equation
`XY_(2)hArrXY+Y`
`{:("Initial",600,0,0),("At equlibrium",600-P,P,P):}`
TOTAL `=600+P=800P=200`
`K=(200xx200)/(400)=100.0`
Discussion
10053.

What happen when nitroethane is boiled with dilute HCl.

Answer»

SOLUTION :Nitroethane on heating with dilut HCl undergoes hydrolysis to give ethanoic acid and HYDROXYLAMINE hydrochloride.
`underset("Nitroethane")(CH_(3)CH_(2)NO_(2)) underset(Delta)overset(HCl//H_(2)O)to[CH_(3)-overset(O)overset(||)(C)-NHOH]overset(HCl//H_(2)O)to underset("Ethanoic acid")(CH_(3)COOH)+underset("Hydroxylamine hydrochloride")(NH_(2)OH.HCl)`
Discussion
10054.

Which halogen does not react with water:

Answer»

`F_2`
`Cl_2`
`Br_2`
`I_2`

ANSWER :D
Discussion
10055.

The structure of CsCl crystal is:

Answer»

body-centred CUBIC lattice
face-centred cubic lattice
octahedral
none of (a), (B) and ( C)

ANSWER :A
Discussion
10056.

Which of the following statement is not true for the reaction given below: [Cu(H_(2)O)_(4)]^(2+)+ 4NH_(4) hArr [Cu(NH_(3))_(4)]^(2+)+4H_(2)O

Answer»

It is LIGAND substitution reaction
`NH_(3)` is a relatively strong FIELD ligand while `H_(2)O` is a weak field ligand
During the reaction, there is a change in colour from light blue to DARK blue
`[Cu(NH_(3))_(4)]^(2+)`, has a tetrahedral structure and is paramagnetic

Solution :In `[Cu(NH_(3))_(4)]^(2+),Cu^(2+)` is `dsp^(2)` hybridised, hence square is square PLANAR and complex is paramagnetic.
Discussion
10057.

Which of the following rate law expression represent zero order reaction :-

Answer»

Which of the following RATE law expression represent ZERO ORDER REACTION :-
Which of the following rate law expression represent zero order reaction :-
Which of the following rate law expression represent zero order reaction :-
Which of the following rate law expression represent zero order reaction :-

Answer :C
Discussion
10058.

the second law of thermodynamics states that

Answer»

in any spontaneous process entropy of the UNIVERSE always increases
energy can NEITHER be created nor be destroyed
energy of the universe remains CONSTANT
DeltaS_universelt0 for a spontaneous reaction

Answer :A
Discussion
10059.

Which of the following substances is used in the laboratory for fast drying for neutral gases

Answer»

SODIUM phosphate
Phosphorus pentoxide
sodium sulphate
Anhydrous CALCIUM chloride

Answer :D
Discussion
10060.

Which one of the following can be remelted time and again without producing any change

Answer»

Blakelite
Malamec
ELASTOMERS
THERMOPLASTIC

ANSWER :D
Discussion
10061.

The solubility of Ca(OH)_(2) is 'S' moles lit^(-1), the solubility product is

Answer»

`4 S^(3)`
`4 S^(2)`
`S^(3)`
`S^(2)`

ANSWER :A
Discussion
10062.

Which of the following aqueous solutions of sodium aceate will show a minimum pH?

Answer»

`0.01` M
`0.001` M
`0.0001` M
`0.1` M

Answer :C
Discussion
10063.

Total energy of one mole of an ideal gas (monoatomic) at 27^@C is :

Answer»

600 cal
900 cal
800 cal
300 cal

Answer :B
Discussion
10064.

Which of the relations are correct for the given physical change : CuSO_4*5H_2O

Answer»

`K_p=p_(H_2O)^2`
`K_c=[H_2O(G)]^2`
`K_p=K_c(RT)^2`
`K_c=K_p(RT)^2`

ANSWER :A::B::C
Discussion
10065.

Which sub-atomic particle is more effective in bringing about artificial transmutation of elements ?

Answer»

NEUTRON
`ALPHA`-PARTICLE
deutron
electron.

Answer :A
Discussion
10066.

What is the ozonolysis derivative of natural rubber ?

Answer»

SOLUTION :NATURAL rubber is cis-polyisoprene. Ozonolysis of polyisoprene gives 4-oxopentanal. The double BONDS cleave during ozonolysis to GIVE CARBONYL groups.
Discussion
10067.

When NaCl_3 is heated in a closed vessel, oxygen is liberated and NaNO_2 is left behind. At equilibrium:

Answer»

Addition of `NaNO_2` favours reverse reaction
Addition of `NaNO_2` favours FORWARD reaction
Increasing temperature favours forward reaction
Decreasing PRESSURE favour reverse reaction

Answer :C
Discussion
10068.

When zeolite, which is hydrated sodium aluminium silicate, is treated with hard water the sodium ions are exchanged with

Answer»

`H^(+)` IONS
`C^(++)`ions
`SO_(4)` ions
`MG^(++)` ions

ANSWER :B::D
Discussion
10069.

Which of the following compounds can exist in optically active form?

Answer»

but- 1 -ene
butan-2-ol
pentan-3-ol
heptan-4-ol

Answer :B
Discussion
10070.

What is limiting reactant in a reaction?

Answer»

Solution :The REACTANT which REACTS COMPLETELY in a reaction is CALLED the LIMITING reactant.
Discussion
10071.

Which of the following has ester linkage

Answer»

NYLON 6,6
TERYLENE
PVC
SBR

Answer :C
Discussion
10072.

There is a growing interest in the use of chelate therapy in medicinal chemistry. An example is the treatment of problems caused by the presence of metals in toxic proportions in plants/animals. Thus, excess of copper and iron are removed by chelating ligands D-penicillarnine and desferrioxime. B via the formation of coordination compounds. EDTA is used in the treatment of lead poisioning. Some coordination compounds of platinum effectively inhibit the growth of tumours. Examples are cis-platin and related compounds. Coordination compounds are of great importance in biological systems. The pigment responsible for photosynthesis, chlorophyll, is a coordination compound of magnesium. Haemoglobin, the red pigment of blood which acts as oxygen carrier is a coordination compound of iron. Vitamin B_(12), cyanocobalam.ine, the antipernicious anaemia factor is a coordination compound of cobalt. How do we remove excess of copper and iron using chelating ligands ?

Answer»

SOLUTION :We use D-penicillamine and DESFERRIOXIME B to REMOVE excess of copper and IRON.
Discussion
10073.

There is a growing interest in the use of chelate therapy in medicinal chemistry. An example is the treatment of problems caused by the presence of metals in toxic proportions in plants/animals. Thus, excess of copper and iron are removed by chelating ligands D-penicillarnine and desferrioxime. B via the formation of coordination compounds. EDTA is used in the treatment of lead poisioning. Some coordination compounds of platinum effectively inhibit the growth of tumours. Examples are cis-platin and related compounds. Coordination compounds are of great importance in biological systems. The pigment responsible for photosynthesis, chlorophyll, is a coordination compound of magnesium. Haemoglobin, the red pigment of blood which acts as oxygen carrier is a coordination compound of iron. Vitamin B_(12), cyanocobalam.ine, the antipernicious anaemia factor is a coordination compound of cobalt. Name the coordination compound that can be used to cure tumours.

Answer»

SOLUTION :cis-platin, a COMPOUND of PLATINUM can CURE TUMOURS.
Discussion
10074.

What is the pH of 1 M solution of acetic acid ? To what volume one litre of this solution be diluted so that pH of the resulting solution will be twice of the original value ? (K_(a)=1.8xx10^(-5))

Answer»

SOLUTION :`CH_(3)COOH rarr CH_(3)COO^(-) + H^(+)`
When CONCENTRATION of `CH_(3)COOH` is 1.0 M, `'ALPHA'` is negligible.
`[H^(+)] = sqrt(K_(a)C) = 4.24 xx 10^(-3)M`
`pH = -log(424 xx 10^(-3))M = 2.37`
Now, let us assume that solution is diluted to a volume where concentration of `CH_(3)COOH` (without considering ionisation) is x
`CH_(3)COOH underset("x(1-alpha)") rarr CH_(3)COO^(-)underset("xalpha") + H^(+)underset("xalpha")`
`K_(a) = xalpha^(2)/1-alpha`
Also, desired pH = 2 xx 2.37 = 4.74
`[H^(+)] = 1.8 xx 10^(-5) = xalpha`
`K_(a) = 1.8 xx 10^(-5) =1.8 xx 10^(-5)alpha/1-alpha`
`alpha = 0.5 and x = 3.6 xx 10^(-5)M`
Volume(final) `= 1//3.6 xx 10^(-5) = 27.78 xx 10^(3)L`
Discussion
10075.

There is a growing interest in the use of chelate therapy in medicinal chemistry. An example is the treatment of problems caused by the presence of metals in toxic proportions in plants/animals. Thus, excess of copper and iron are removed by chelating ligands D-penicillarnine and desferrioxime. B via the formation of coordination compounds. EDTA is used in the treatment of lead poisioning. Some coordination compounds of platinum effectively inhibit the growth of tumours. Examples are cis-platin and related compounds. Coordination compounds are of great importance in biological systems. The pigment responsible for photosynthesis, chlorophyll, is a coordination compound of magnesium. Haemoglobin, the red pigment of blood which acts as oxygen carrier is a coordination compound of iron. Vitamin B_(12), cyanocobalam.ine, the antipernicious anaemia factor is a coordination compound of cobalt. A person has accidently consumed a material containing lead. How can we treat the person using a chelating compound ?

Answer»

SOLUTION :EDTA solution can be used to TREAT the person. EDTA forms a chelate with LEAD and can be REMOVED.
Discussion
10076.

There is a growing interest in the use of chelate therapy in medicinal chemistry. An example is the treatment of problems caused by the presence of metals in toxic proportions in plants/animals. Thus, excess of copper and iron are removed by chelating ligands D-penicillarnine and desferrioxime. B via the formation of coordination compounds. EDTA is used in the treatment of lead poisioning. Some coordination compounds of platinum effectively inhibit the growth of tumours. Examples are cis-platin and related compounds. Coordination compounds are of great importance in biological systems. The pigment responsible for photosynthesis, chlorophyll, is a coordination compound of magnesium. Haemoglobin, the red pigment of blood which acts as oxygen carrier is a coordination compound of iron. Vitamin B_(12), cyanocobalam.ine, the antipernicious anaemia factor is a coordination compound of cobalt. Name the coordination compound that has a role to play as oxygen carrier.

Answer»

SOLUTION :HAEMOGLOBIN ACTS as OXYGEN CARRIER.
Discussion
10077.

There is a growing interest in the use of chelate therapy in medicinal chemistry. An example is the treatment of problems caused by the presence of metals in toxic proportions in plants/animals. Thus, excess of copper and iron are removed by chelating ligands D-penicillarnine and desferrioxime. B via the formation of coordination compounds. EDTA is used in the treatment of lead poisioning. Some coordination compounds of platinum effectively inhibit the growth of tumours. Examples are cis-platin and related compounds. Coordination compounds are of great importance in biological systems. The pigment responsible for photosynthesis, chlorophyll, is a coordination compound of magnesium. Haemoglobin, the red pigment of blood which acts as oxygen carrier is a coordination compound of iron. Vitamin B_(12), cyanocobalam.ine, the antipernicious anaemia factor is a coordination compound of cobalt. A compound of magnesium is vital for an important process in sunlight. Name the process and the compound.

Answer»

Solution :Photosynthesis is CARRIED out in the presence of CHLOROPHYLL a CHELATE COMPOUND of magnesium.
Discussion
10078.

Which of the following is not formed by the ozonolysis of (o-xylene)

Answer»

Glyoxal
Ethyl glyoxal
Dimethyl glyoxal
Methyl glyoxal

Answer :B
Discussion
10079.

Write the structure of tert-alkyl halide having molecular formula C_(5)H_(11)Br.

Answer»

Solution :`CH_(3)-overset(BR)overset("| ")underset(CH_(3))underset("| ")"C "-CH_(2)-CH_(3)`
Discussion
10080.

Which is the relation between the specific impulse I_(s) and thecritical temperature T_(c) attained in a rocket blast

Answer»

`I_(s) ge 1//T_(c)`
`I_(s)` and `T_(c)^(2)`
`I_(s) ge T_(c)^(1//2)`
`I_(s) ge T_(c)`

Solution :When SPECIFIC IMPULSE is GREATER than critical temperature then ROCKET blast takes place. So the condition `I_(s) ge T_(c)^(1//2)` is right.
Discussion
10081.

Which of the following is a poor conductor of electricity?

Answer»

`CH_(3)COONa`
`C_(2)H_(5)OH`
`NaCl`
`KOH`

Answer :B
Discussion
10082.

Which of the following statements about Na_(2)O_(2) is not correct?

Answer»

It is diamagnetic in nature
It is derivative of `H_(2)O_(2)`
Na_(2)O_(2) oxidation `Cr^(3+)" to "CrO_(4)^(2-)` in acid medium.
It is the super OXIDE of sodium.

Solution :`Na_(2)O_(2)` is peroxide of sodium not superoxide. The FORMULA of sodium superoxide is `NaO_(2)`.
Discussion
10083.

Which of the following solution(s) change its colour on passing ozone through it is/are

Answer»

starch iodide solution
alcoholic solution of benzidine
acidic SOLUTIONS of potassium dichromate
acidified solution of FERREOUS sulphate

Answer :A::B::D
Discussion
10084.

Type metal is an alloy of Pb, Sb and S.it consists of

Answer»

EQUAL amounts of the three metals
More amount of LEAD
More amount of antimony
More amount of TIN

Solution :TYPE METAL Pb=82%, Sb=15%,Sn=3%
Discussion
10085.

The specific rate constant for a first order reaction is 60xx10^(-4) sec^(-1). If the initial concentration of the reactant is 0.01mol L^(-1), the rate is

Answer»

`60XX10^(-6)MSEC^(-1)`
`36xx10^(-4)Msec^(-1)`
`60xx10^(-2)Msec^(-1)`
`36xx10^(-1)Msec^(-1)`

Answer :A
Discussion
10086.

Whichofthefollowingpairsofmetalsis purified by vanArkelmethod ?

Answer»

Ni andFe
Ga ANDIN
ZR andTi
AgandAu

SOLUTION :Zr and TI fromvolatileunstableiodides.
Discussion
10087.

Which halidedoes not give a precipitatewith alcoholic AgNO_3

Answer»

ALLYL CHLORIDE
BENZYL chloride
Chlorobenzene
t-butyl chloride

ANSWER :C
Discussion
10088.

Write the oxidation numbers of 'Cr' in CrO_(3) Cr_(3)O_(3) and CrO_(3).

Answer»

Solution :Oxidationnumber of Cr in CRO is +2, in `Cr_(2)O_(3)` is +3 and in `CrO_(3)` is +6.
Discussion
10089.

Which of the following electrolytic solution has the least specific conductance ?

Answer»

2N
`0.002 N`
`0.02 N`
`0.2 N`

Solution :In GENERAL, specific CONDUCTANCE of an electrolyte decreses with DILUTION. So, 0.002 N solution has LEAST specific conductance.
Discussion
10090.

Which of the following is correct about H-bonding in nucleotide?

Answer»

A---A and T ---T
G---T and A---C
A --- G and T ---C
A---T and G --- C

Solution :
The hydrogen bonds are formed between the BASE (SHOWN by dotted lines). Because of size and geometries of the bases, the only possible pairing in DNA and between G(Guanine) and C(Cytosine) through THREE H-bonds and between A (Adenine) and T (Thymine) through two H-bonds.
Discussion
10091.

Which of the following compounds can be classified as aryl halides?

Answer»

`p-ClC_(6)H_(4)CH_(2)CH(CH_(3))_(2)`
`p-CH_(3)CHCl(C_(6)H_(4))CH_(2)CH_(3)`
`o-BrH_(2)C-C_(6)H_(4)CH(CH_(3))CH_(2)CH_(3)`
`C_(6)H_(5)-Cl`

Solution :In compound (b) and (c), halogen is present in the side chain and hence they are not aryl HALIDES.

THUS, options (a) and (d) are correct.
Discussion
10092.

What will be the effect of temperature on rate constant?

Answer»

SOLUTION :RATE constant of all reaction increases by increasing temperature.
Rate constant of a reaction is nearly DOUBLED with rise in temperature by `10^(@)` .According to Arrhenius equation.
`K=Ae^(-(E_(a))/(Rt))` and In `k=-(E_(a))/(RT)+In A`
`therefore In k prop -(1)/(T)impliesKpropT`
e.g., the rate of decomposition of `N_(2)O_(5)` is increase with temperature.
Discussion
10093.

Which of the following reactions is an example of nitrogen fixation ?

Answer»

`2N_(2)O to 2N_2+O_(2)`
`NH_(3)+H_(2)O to NH_(4)^(+)+OH^(-)`
`N_(2)+O_(2) to 2NO`
`2NO_(2)+H_(2)O to HNO_(2)+HNO_(3)`

Answer :C
Discussion
10094.

Which of the following compounds, when heated with HNO_(3) (conc), cooled and then treated with AgNO_(3) a white pot, is formed. The compound can be

Answer»

I,II,III or IV
II,III
IV and V
I,II,III,V

Solution :(B)
and `C_(6)H_(4)-CH_(2)Cl` carbocation is stabilised by resonance and in IV `Cl^(-)` is replaced by `NO_(3)^(-)`
Discussion
10095.

What happens when white phosphorus is heated with concentrated NaOH solution in an inert atmosphere of CO_(2) ?

Answer»

Solution :White PHOSPHORUS REACTS with NaOH to form phosphine.
`underset("Phosphorus")(P_(4)) + 3 NaOH + 3H_(2)O underset(CO_(2)"ATMOSPHERE")overset("Heat")rarr underset("Phosphine")(PH_(3)) + underset("Sod. Hypophosphite")(3NaH_(2)PO_(2))`
Discussion
10096.

Write short note on Kolbe's electrolytic reaction.

Answer»

Solution :The aqueous solutions of sodium or potassium SALTS of carboxylic ACID on electrolysis gives alkanes at anode. This reaction is called kolbes electrolysis.

Sodium formate solution on electrolysis gives HYDROGEN
Discussion
10097.

Two monosaccharides are linked by …………., to form a disaccharide

Answer»

GLYCOSIDIC linkage
peptide BOND
`- UNDERSET(O)underset(||)(C)- underset(H)underset(|)(N)-` linkage
`-underset(O)underset(||)(C)-` linkage

Solution :glycosidic linkage
Discussion
10098.

Urea is preferred to ammonium sulphate a a nitrogeneous fertilizer because

Answer»

it is more soluble in water
it is cheaper than ammonium sulphate
it is quite stable
it does not cause acidityin the SOIL.

Solution :It does not cause acidity in the soil.
Discussion
10099.

Whichof the followinghas highestkbvalue .

Answer»




ANSWER :A
Discussion
10100.

Which one of the following ions is coloured ?

Answer»

`Sc^(3+)`
`Ti^(4+)`
`ZN^(2+)`
`V^(2+)`

ANSWER :D
Discussion