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7401.

Which one of the following is not a homogeneous catalytic reaction ?

Answer»

manufacture of `H_(2) SO_(4)` by lead CHAMBER process
ACID catalysed HYDROLYSIS of ester
inversion of cane suger in the presence of mineral acid
manufacture of `H_(2)SO_(4)` by contact process

Solution :no catalyst is used in solvay process
Discussion
7402.

Which of the following statements are incorrect about receptor proteins ?

Answer»

Majority of receptor proteins are embedded in the cell membranes.
The active site of receptor proteins opens on the inside region of the cell.
Chemical messengers are received at the binding SITES of receptor proteins.
SHAPE of receptor doesn't CHANGE during attachment of messenger.

Solution :The active site of receptor proteins opens on the outer region of the cell and the shape of receptor changes during attachment of messenger.
Discussion
7403.

Whichof thefollowingwill notundergohellvolhardZelinskyreaction

Answer»

Propnaoicacid
2,2-dimehtylpropanoicacid
2-Methylpropanoic acid
Butanoicacid

SOLUTION :`CH_3 - underset(CH_3) underset(|) OVERSET(CH_3 ) overset(|)C-COOH ` doesnotcotain` alpha ` - hydrogenand therefore, WILLNOT UNDERGO Hellvolhardreaction
` 2,2 ` dimethylpropanoicacid
Discussion
7404.

The unit of ionic product of water (K_w) is :

Answer»

`MOL^(-1) LITRE^(-1)`
`mol^(-1) litre^(-2)`
`mol^(-2) litre^(-2)`
`mol^2 litre^(-2)`

ANSWER :D
Discussion
7405.

Washing soapcan be prepared by saponification with alkali and

Answer»

ROSE OIL
PARAFFIN oil
Groundnutoil
KEROSENE oil

Answer :C
Discussion
7406.

What is the side product obtained during the preparation of diethyl ether by the dehydration of ethyl alcohol with concentrated H_(2)SO_(4)?

Answer»

Ethylene
Ethane
Alcohol
Ethanal

Solution :Ethylene is obtained as the side product during preparation of diethyl ETHER by the dehydration of ethyl alcohol with concentrated `H_(2)SO_(4)`.
`UNDERSET("Ethylene")(H_(2)O+CH_(2)=CH_(2)) OVERSET("conc. " H_(2)SO_(4))larr C_(2)H_(5)Oh underset(DELTA)overset("conc." H_(2)SO_(4))to underset("Diethyl ether")(C_(2)H_(5)-O-C_(2)H_(5)+H_(2)O)`
Discussion
7407.

Which one of the following metals does NOT react with cold water ?

Answer»

Calcium (CA)
Potassium (K)
Magnesium (MG)
Sodium (Na)

Solution :The TEMPERATURE at which a solid and liquid phase may coexist in equilibrium . The term applies to pure liquids and solutions . It is also known as Freezing point . The melting point of the iron is `2,800^(@)F` (1537.77778 Celsius `(^(@)C`)
Discussion
7408.

Write the IUPAC name of the CH_3-underset(CH_3)underset(|)CH-underset(OH)underset(|)CH-underset(CH_3)underset(|)overset(CH_3)overset(|)C-CH_3

Answer»

SOLUTION :2,2,4-Trimethylpentan-3-ol
Discussion
7409.

Which among the following eqations represents the first law of thermodynamics under isobaric conditions?

Answer»

`DELTAU=q_p-p_(EX)* DELTAV`
`q_v = DeltaU`
`DeltaU =W`
`W=-q`

ANSWER :A
Discussion
7410.

Which are explosives :

Answer»

WOOD pulp (DYNAMITE)
Cellulose nitrate(BLASTING gelatin)
Gun or COTTON cellulose nitrate and vaseline (cordite)
All

Answer :D
Discussion
7411.

Which does not influence the rate of reaction

Answer»

PRESSURE
CONCENTRATION of reactant
temperature
molecularity

SOLUTION :It is INDEPENDENT on molecularity.
Discussion
7412.

Which of the following precipitate can act as a semipermeable membrane?

Answer»

CALCIUM PHOSPHATE (GELATINOUS)
Phenol layer
Copper ferrocyanide (gelatinous)
All

Answer :D
Discussion
7413.

Which of the following will result in the formation of an ether ?

Answer»

`(CH_(3))_(3)CO^(-)Na^(+)+C_(2)H_(5)Brrarr`
`(CH_(3))_(3)CBr+C_(2)H_(5)O^(-)Na^(+)rarr`
`C_(6)H_(5)O^(-)Na^(+)+CH_(3)Br rarr`
`C_(6)H_(5)Br+CH_(3)O^(-)Na^(+) rarr`

Solution :[Hint]
Tertiary halide and aromatic halide do not give WILLIAMSON's ETHER synthesis.
Discussion
7414.

The two forms of D-Glucopyranoše are called

Answer»

DIASTEREOMERS
ANOMERS
EPIMERS
ENANTIOMERS Disaccharides

Answer :B
Discussion
7415.

Using Kohlrausch law, calculate Lambda_0 for acetic acid, if Lambda_0 value for hydrochloric acid, sodium chloride and sodium acetate are respectively 426, 126 and 91 S cm^(2) mol^(-1).

Answer»

Solution :`Lambda_(0)` of acetic acid `= Lambda_(0)` of `CH_(3)CO O +Lambda_(0)` of `H^(+)`
`= Lambda_(0)` of HCl `+ Lambda_(0)` of `CH_(3) C O Ona-Lambda_(0)` of NaCl
`= 426 + 91 - 126 = 391 S cm^(2) MOL^(-1)`.
Discussion
7416.

Which oxide of vanadium is most likely to be basic and ionic ?

Answer»

`VO`
`V_2O_3`
`VO_2`
`V_2O_5`

ANSWER :A
Discussion
7417.

What are micelles ? Give an example of a micellers system.

Answer»

SOLUTION :Aggregated PARTICLES formed by the AGGREGATION of a large NUMBER of ions are known as micelles. IMPORTANT examples of miceller systems are soaps and synthetic detergents.
Discussion
7418.

The solubility product of BaSO_(4)" is " 1.5 xx 10^(-9) The precipitation in a 0.01 M Ba^(+2) solution will start , on adding H_(2)SO_(4) of concentration

Answer»

`10^(-9)`M
`10^(-8)M`
`10^(-7)M`
`10^(-6)M`

ANSWER :3
Discussion
7419.

The solubility of silver bromide in hypo solution is due to the formation of:

Answer»

`Ag_(2)SO_(3)`
`Ag_(2)S_(2)O_(3)`
`[AG(S_(2)O_(3))]^(-)`
`[Ag(S_(2)O_(3))]^(3-)`

ANSWER :D
Discussion
7420.

The structure given below is known as:

Answer»

Penicillin - F
Penicillin- G
Penicillin- K
AMPICILLIN

Solution :See STRUCTURE of PENICILIN.
Discussion
7421.

Which is/are correct statement(s)?

Answer»

`[CO(en)_(3)][CR(CN)_(6)]` will show coordination isomerism
`[Mn(CO)_(5)(SCN)]` will show LINKAGE isomerism
`[Co(NH_(3))_(5)(NO_(3))]""SO_(4)` will show ionisation isomerism
None is correct

Answer :A::B::C
Discussion
7422.

Write the rate law for a first order reaction.

Answer»

SOLUTION :`dx/dt=K[A]^1`
Discussion
7423.

Which among the following compound will give offensive compound when heated with chloroform and alcoholic potassium hydroxide ?

Answer»

`CH_3CN`
`(CH_3)_3N`
`C_2H_5NH_2`
`C_6H_5CONH_2`

ANSWER :C
Discussion
7424.

Which of the following curve gives the variation of wedge_(m)^(oo) with sqrt(c) for CH_(3)COOH

Answer»




NONE of these

Answer :D
Discussion
7425.

Which of the following statements is correct w.r.t. both electrolytic cell and Galvanic cell

Answer»

in both CELLS, anode is shown by +ve sign
in both cells, cathode is shown by -ve sign
in both cells, REDUCTION reaction takes place at the cathode
in both cells, oxidation reaction takes place at the cathode

Answer :C
Discussion
7426.

Which one of the following is used for the estimation of ferrous salts, oxalates, hydrogen peroxide and iodides?

Answer»

`K_(2)MnO_(4)`
`KMnO_(4)`
`K_(2)Cr_(2)O_(7)`
`CrO_(2)Cl_(2)`

SOLUTION :`KMnO_(4)`
Discussion
7427.

Which of the followingdecreases on dilution of electrolyte solution ?

Answer»

Equivalent conductance
MOLAR conductance
Specificconductance
Conductance

Answer :C
Discussion
7428.

Use of chemicals for therapeutic effect is called

Answer»

medicines
chemotherapy
drug TARGET interaction
phototherapy

Answer :B
Discussion
7429.

What is biofuel ?

Answer»


ANSWER :The CARBOHYDRATES act as the MAJOR source of ENERGY for functioning of the living system and CALLED as biofuel.
Discussion
7430.

The smelting of iron in a blast furnace involves the following process except

Answer»

Combustion
reduction
SLAG formation
SUBLIMATION

Solution :In smelting of calcinated ORE, Iron oxide reduced to Iron.
Acidimpurities `SiO_(2)` forms slag with CaO `"" SiO_(2)+CaO to CaSiO_(3) ("slage")`
In Combustion zone carbon reduces `CO_(2)` to CO `"" CO_(2)+C to 2CO`
Discussion
7431.

What is the value of n for Mg_((S))|Mg_((aq))^(2+)||Al_((aq))^(3+)|Al_((S)) ?

Answer»

1
2
3
6

Solution :(i) `Mg_((S)) to Mg_((aq))^(2+)+2e^(-)`
(ii) `Al_((aq))^(3+)+3e^(-) to Al_((S))`
So, `(i)xx3 and (ii)xx2`, to obtain equilibrium.
`3Mg_((S)) to 3Mg_((aq))^(2+)+6E^(-)`
`2Al_((aq))^(3+)+6e^(-) to Al_((S))`.
So, `n=6e^(-)` total electrone TRANSFER.
Discussion
7432.

The values of van der Waal's constants 'a' for the gases, O_2, N_2, NH_3 and CH_4 are 1.36, 1.39, 4.17 and 2.253 L^2 atm mol e^(-2) respectively. The gas which can most easily be liquified is

Answer»

`O_2`
N_2
`NH_3`
`CH_4`

ANSWER :C
Discussion
7433.

Which of the following processes will release energy equal to ionziation energy ?

Answer»

`M_((G)) OVERSET(+E^(-))to M_((g))^((-))`
`M_((s)) overset(-e)to M_((s))^(+)`
`M_((g))^(+) overset(+e^(-))to M_((g))`
`M_((g)) overset(-e^(-))to M_((g))^((-))`

ANSWER :C
Discussion
7434.

Total number of isomers in [Pt(NH_(3))_(2)(CN)_(2)] is :-

Answer»

2
4
6
8

Solution :
Discussion
7435.

What are colloidal solutions ? How are they classified? Give examples.

Answer»

Solution :A heterogeneous system in which one substance is dispei ed as large particles in another substance is called colloidal solution.
`to` In colloidalsolution the particle sizeof the dispersed phase is of the order of `l mmu`- 1 `mu -1 mu` where as in true solution the particle size of the solute are the order of m`mu` or less.
`to `Colloidal solution is a heterogeneous binary systemwhere as true solution is a homogeneous binary system.
On the basis of physica! states of dispersed phase and dispei sion medium colloidal solutions are classified into EIGHT TYPES.


On the basis of nature of difersion medium colloids are classified asfollows.
`to` If the dispersion medium is 'air' , the sols are called aerosols.Eg: Smoke .
`to` If the dispersion medium is 'water' the sols are called hydrosol (or) aquasol .
Eg: Starch solution.
`to` If the disperison medium is 'alcohol ' then the sols are called alcosols.
The colloidal solution in which the dispersed phase has great affinity to the dispersion medium is called a Lyophillic colloid or Lyophilic solution. Ex: Starch solution.
The starch PASTE when dissolved in hot water, with stirring, the starch solution is formed. The starch particles (dispersed phase) has great affinity to water molecules (dispersion medium). So starch solution is a lyophilic solution or lyophilic colloid.
Lyophobic colloid : The colloidal solution in which there exists not much affinity between the dispersed phase and dispersion medium, it is called a Lyophobic colloid or Lyophobic solution. Ex : GOLD solution.
Gold rods are placed in watercontainingalkali.Electricarcis appliedbetweengold rods. the gold particles dissolves in water, to give gold solution.
Gold particles (dispersed phase) have not much affinity towards water (dispersion medium). So this is a Lyophobic solution or Lyophobic colloid.
Discussion
7436.

Which among the following equation represents the reduction reaction taking place in lead accumulator at positive electrode, while it is beings used asa source of electrical energy?

Answer»

`PB to Pb^(2+)`
`Pb^(4+) to Pb`
`Pb^(2+) to Pb`
`Pb^(4+) to Pb^(2+)`

Solution :In lead accumulator reduction reaction is
`UNDERSET(O.N.=+4)underset(darr)(PbO_(2)(s)) + 4H^(+)(aq) + SO_(4)^(2-)(aq) to underset(O.N.=+2)underset(darr)(PbSO_(4)(s)) + 2H_(2)O(l)`
Discussion
7437.

Write the structure of : (a) 3 - chloro -3 - ethylhex - 1 - ene (b ) 1- Iodo -2 3 - dimethylbutane (c) 1 , 3,5 - tribromobenzene

Answer»

SOLUTION :
Discussion
7438.

The reagent used for separation of acetaldehyde and acetophenone is

Answer»

`NaHSO_(3)`
`C_(6)H_(5)NHNH_(2)`
`NH_(2)OH`
`NaOH-I_(2)`

SOLUTION :ACETALDEHYDE forms addition product with `NaHSO_(3)` but acetophenone does not.
Discussion
7439.

The solubility of BaSO_(4) in water is 2.33 xx 10^(-3) gm/litre. Its solubility product will be (molecular weight of BaSO_(4) = 233)

Answer»

`1 XX 10^(-5)`
`1 xx 10^(-10)`
`1 xx 10^(-15)`
`1 xx 10^(-20)`

Solution :The solubility of `BaSO_(4)` in g/litre is given `2.33 xx 10^(-3)` `because` in mole/litre. `N = (W)/(m.wt) = 1 xx 10^(-5) = (2.33 xx 10^(-3))/(233)`
Because `BaSO_(4)` is a compound
`K_(sp) = S^(2) = [1 xx 10^(-5)]^(2) = 1 xx 10^(-10)`.
Discussion
7440.

Which reaction cannot be used for the production of halogen acid

Answer»

`2KBr + H_(2)SO_(4)to K_2SO_(4) +2HBr`
`NaHSO_(4) + NACL to Na_(2)SO_(4) + HCL`
`NaCl + H_(2)SO_(4) to NaHSO_4 + HCl `
`CaF_(2) + H_(2)SO_(4) to NaSO_(4) + 2HF`

Solution :`2KBr +H_(2)SO_(4) to K_(2)SO_(4) +2HBr`
Discussion
7441.

What will be the value of x,y and z in the following equation -

Answer»

2,1,2
1,2,2
2,2,1
None

ANSWER :B
Discussion
7442.

Using Dulong and Petit's law, what will be the atomic mass of metal having specific heat capacity 0.1344 JK^(-1)gm^(-1)

Answer»

47.62 gm/mol
840 gm/mol
100 gm/mol
200 gm/mol

Solution :SPECIFIC heat (Cal/mole-K: atomic MASS `approx6.4`
`(0.1344)/(4.2)xx` atomic mass `approx6.4`
Atomic mass `APPROX=(6.4xx4.2)/(0.1344)=200 gm//"mol"`
Discussion
7443.

Which are correct statement?

Answer»

In less acidic solution `K_(2)Cr_(2)O_(7)` and `H_(2)O_(2)` gives violet coloured diamagnetic `[CrO(O_(2))(OH)]^(-) ion`.
In alkaline `H_(2)O_(2).K_(3)CrO_(8)`(with tetraperoxo species `[Cr(O_(2))_(4)]^(3-)` is formed with `K_(2)Cr_(2)O_(7).`
In ammonical solution of `H_(2)O_(2),(NH_(3))_(3)CrO_(4)` is formed with `K_(2)Cr_(2)O_(7)`.
`CrO_(4)^(2-)` change to `Cr_(2)O_(7)^(2-)` by oxidation.

Solution :(a) ACIDIFIED `K_(2)Cr_(2)O_(7)` solution reacts with `H_(2)O_(2)` solution reacts with `H_(2)O_(2)` to GIVE a deep BLUE solution due to the formation of `CrO_(5)`.
`Cr_(2)O_(7)^(2-)+2H^(+)+4H_(2)O_(2) to 2CrO_(5)+5H_(2)O`
(B) In alkaline medium with `30% h_(2)O_(2)`. a red -brown `K_(2)CrO_(8)` (diperox) is formed . it is tetra peroxo species `[Cr(O_(2))_(4)]^(3-)` amd thus the `Cr` is in `+V` oxidation state.
(C ) In ammoniacal solution a dark red-brown compound, `(NH_(3))_(3)CrO_(4)`-doperoxo compound with `Cr(IV)` is formed.
(D ) In `CrO_(4)^(2-)` the `Cr` is in its highest `+6` oxidation state. so it can not be further oxidised.
Discussion
7444.

What volume of a solution of hydrochloric acid containing 73 g acid per litre would sufficient for the exact neutralisation of sodium hydroxide obtained by allowing 0.46 g of metallic sodium to act upon water.

Answer»

10 ml
15 ml
20 ml
8 ml

Solution :`(0.46)/(23)=(73)/(36.5)XXV(I)`
`V=10ml`
Discussion
7445.

What structural feature is required for a carbohydrate to behave as reducing sugar ?

Answer»

Solution :The carbonyl GROUP of any ONE MONOSACCHARIDE PRESENT in carbohydrate should be free.
Discussion
7446.

What is meant by resistance ? Given its unit.

Answer»

Solution :RESISTANCE is the opposition that a cell OFFERS to the flow of electric current through it.
`R prop l/A`
The SI UNIT of `R = Ohm (OMEGA)`.
Discussion
7447.

What is the role of sulphur in vulcanization of rubber?

Answer»

Solution :Sulphur forms cross LINKS at the REACTIVE SITES of DOUBLE bonds and THUS the rubber gets stiffened.
Discussion
7448.

Vitamin C is ………………..

Answer»

Citric ACID
LACTIC acid
Paracetamol
ASCORBIC acid

Solution :Ascorbic acid
Discussion
7449.

which of the following is novolac

Answer»




ANSWER :D
Discussion
7450.

Which of the following oxo-acid is not possible ?

Answer»

`HOClO_(2)`
`HlOFO_(2)`
`HOBrO_(2)`
`HOIO_(2)`

ANSWER :B
Discussion