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21351.

Urea upon hydrolysis yields

Answer»

Acetamide
Carbonic acid
Ammonium HYDROXIDE
`NO_(2)`

SOLUTION :
Discussion
21352.

Which of the following is not electrophile ?

Answer»

`BF_3`
`HG^(2+)`
`AlCl_3`
`NH_3`

ANSWER :D
Discussion
21353.

Which is not true covalent oxide of iodine

Answer»

`I_(4) O_(9)`
`I_(2)O_(5)`
`I_(2)O_(4)`
`I_(2)O_(8)`

Solution :`I_(2)O_(5)` is the TRUE covalent OXIDE of Iodine
Discussion
21354.

Which functional group is present in polyester ?

Answer»

`-COO-`
`-CH_(2)-CH_(2)-`
`-CONH-`
`-CH_(2)-CN-`

SOLUTION :`-COO-`
Discussion
21355.

Which of the following is not a consequence of the Lanthanoid contraction?

Answer»

5d series elements have a higher `IE_(1)` than 3d or 4d series
Zr and HF have a comparable size
Zr and Hf occurs TOGETHER in the earth CRUST in their minerals
High DENSITY of the SIXTH period elements

Answer :D
Discussion
21356.

Which of the following diagram is correctly related to extraction of pb from galena?

Answer»

Galena `overset("forth floation") rarr ORE overset("Roasting ") underset("with air")rarr`
Roasted ore `overset("Heating with pbs")rarr Pb`
Galena `overset("Magnetic")underset("Seperation") rarr Ore overset("Roasting ") underset("with air")rarr`
Roasted ore `overset("Reduction")underset ("carbon")rarr Pb`
Galena `overset("Leaching")underset("by NaCN") rarr Ore overset("ZN") rarr Pb`
Galena `overset("Forth floatation") rarr Ore overset("ELECTROLYTIC ") underset(" reduction")rarrPb`

Answer :1
Discussion
21357.

The solubility order for alkali metal fluoride in water is :

Answer»

`LiF LT RbF lt KF lt NaF`
`RbF lt KF lt NaF lt LiF`
`LiF lt RbF lt NaF lt KF `
`LiF lt NaF lt KF lt RbF `

ANSWER :D
Discussion
21358.

Two oxides of a metal contains 50% and 40% of a metal respectively .The formula of the first oxide is MO. Then the formula of the second oxide is :-

Answer»

`MO_(2)`
`M_(2)O_(3)`
`M_(2)O`
`M_(2)O_(5)`

Answer :B
Discussion
21359.

Which of the following will not undergo Hell-Volhard Zelinsky (HVZ) reaction ?

Answer»

HCOOH
`CH_(3)COOH`
`CH_(2)CH_(2)COOH`
`CH_(3)CHBrCOOH`

ANSWER :A
Discussion
21360.

Which one of the following statements is incorrect ?

Answer»

SPECIFIC conductivity decreaseswith dilution ,.
Equivalent and MOLAR conducities INCREASES with dilution .
`Lamda_(m)^(@)`for a weakelectrolyte cannot be FOUND by extrapolation of ` Lamda_(m)`to zeroconcentration .
Molar conductivity of a strong electrolyte increases with dilution because ionization

Answer :D
Discussion
21361.

Which of the following reactions will yield phenol?

Answer»




Solution :CHLOROBENZENE does not UNDERGO hydrolysis on treatment with AQ. NAOH at 298K. All the remaining THREE options are correct.
Discussion
21362.

The true statement about the following conformation is :

Answer»

It has maximum angle strain.
It does not have ECLIPSING strain (tortional strain).
It does not have any intramolecular HYDROGEN bonding.
It has maximum VANDER WAAL strain.

Answer :B
Discussion
21363.

Which of the following elements is present as the impurity to the maximum extent in the pig iron?

Answer»

MANGANESE 
CARBON 
Silicon 
Phosphorus 

Answer :B
Discussion
21364.

What happens when acetyl chloride is treated with ethanol?

Answer»

Solution :`underset("acetyl CHLORIDE")(CH_3 - undersetoverset(||)(O)(C ) -Cl) + underset("ETHYL alcohol")(C_2H_5) to underset("ethyl ACETATE")(CH_3 - undersetoverset(||)(O)(C ) - O C_2H_5) + HCL`
This reaction is also known as alcoholysis.
Discussion
21365.

Which of the following is a feature of adiabatic expansion?

Answer»

`DeltaVlt0`
`DeltaUlt0`
`DeltaUgt0`
`DeltaT=0`

ANSWER :B
Discussion
21366.

Which of the following does not give oxygen on heating?

Answer»

`K_2Cr_2O_7`
`(NH_4)_2Cr_2O_7`
`KClO_3`
`ZN(CIO_3)_2`

ANSWER :B
Discussion
21367.

The solubility of silver chromate in 0.01 M K_(2)CrO_(4) is 2 xx 10^(-8) mol m^(-3). The solublity product of silver chromate will be

Answer»

`8 xx 10^(-24)`
`16 xx 10^(-24)`
`1.6 xx 10^(-18)`
`16 xx 10^(-18)`

Solution : `{:("Given " K_(2)CrO_(4),hArr,2K^(+),+,CrO_(4)^(2-)),("CONC. "0.01,,0.02,,0.01),("and for "Ag_(2)CrO_(4),,,,):}`
`{:(Ag_(2)CrO_(4),hArr,2Ag^(+)+,CrO_(4)^(2-)),(S,,2S,S+0.1):}`
`K_(SP) = [Ag^(+)][CrO_(4)^(2-)]`
`K_(sp) = (2S)^(2)(S + 0.01) rArr 4S^(2) [S + 0.01]`
? `K_(sp) = 4[2 xx 10^(-8)]^(2) xx 0.01 [[2 xx 10^(-8)]^(2) lt lt 0.01]`
`K_(sp) = 4 xx 4 xx 0.01 xx 10^(-16), K_(sp) = 16 xx 10^(-18)`
Discussion
21368.

Which of the following elements forms p_(pi)-p_(pi) bond with itself?

Answer»

N
P
Se
Te

Solution :Nitrogen, being SMALLER in size can effectively ) from `P pi` - pn bonds with other atoms of itself and atoms of other elements with small size and high ELECTRONEGATIVITY such as OXYGEN and carbon. The other elements do not from pt - pi bonds because of their relatively LAGER size. In other words the p orbital of there elements are larger in size.
Discussion
21369.

Which of the following shows optical activity ?

Answer»

Trans-`[CO(NH_3)_4CI_2]^+`
[CR(H_2O)_6]^(3+)`
CIS-`[Co(NH_3)_2(en)_2]^(3+)`
Trans-[Co(NH_3)_2(en)_2]^(3+)`

Answer :C
Discussion
21370.

Which is a stronger oxidising agent Cr^2+orFe^(2+) Why?

Answer»

Solution :`Cr^(2+)` is a stronger oxidising agent. Outer electronic configuration of `Cr^(2+)` is `3d^4`When it； acts as a reducing agent it GETS oxidised to `C^(2+)` having `3d^3` configuration. But in the case of `Fe^(2+)` ,its outer configuration changes from `3d^6` to `3d^5` .In a medium like water,CON figuration is more-stable because all the electrons are in lowering level. So `Cr^(2+)` has a greater tendency for REDUCTION and it gets converted more readily to `Cr^(3+)`.
Discussion
21371.

The strongest acidic oxide is :

Answer»

`SO_2`
`SO_3`
`P_2O_5`
`Sb_2O_3`

ANSWER :B
Discussion
21372.

When 5mL of a 1.0M HCl solution is mixed with 5mL of a 0.1M NaOH solution, temperature of solution increases by t^(@)C. Which of the following(s) can be predicted from this observation

Answer»

If `5mL` of `0.1M HCl` is MIXED with `5mL 0.1M NH_(3)` solution, the temperature rise will be less than `t^(@)C`
If `5mL 0.1M CH_(3)COOH` is mixed with `5mL 0.1 M NaOH`, the temperature rise will be less than `t^(@)C`
If `10mL` of `1.0M HCl` is mixed with `10mL` of `0.1M NaoH`, the temperature rise will be `2t^(@)C`
If `10 ML` of `0.1M HCl` is mixed with `10 mL` of `0.1 M NaCl` the temperature rise will be `t^(@)C`

Solution :ab
Reaction proceeds by limiting REAGENT only. ENTHALPY of neutralization decreases, when acid or base or both are weak:
Discussion
21373.

When atoms are placed at the corners of all 12 edges of a cube, the number of atoms present per unit cell is :

Answer»

1
2
4
6

Answer :A
Discussion
21374.

Which of the following is more volatile ?

Answer»

He
Xe
Kr
Ne

Answer :A
Discussion
21375.

Which of the following processes results in the formation of a new compound?

Answer»

DISSOLVING common SALT in water
Heating water
Heating platinum ROD
Heating iron rod

Answer :D
Discussion
21376.

Write the reactions of F_2 and Cl_2 with water.

Answer»

SOLUTION :Fluorine vigorously reacts with water and oxidises water to `O_(2)`
`2H_(2)O + 2F_(2) to 4HF + O_(2)`
Chlorine dissolves in water to form hypochlorous acid which upon standing LIBERATES nascent oxygen and shows bleaching action.
`Cl_(2)+ H_(2)O to underset(HCl + [O])underset(darr)(HClO + HCl)`
Nascent oxygen
Coloured substances + [O] `to` colourless
Discussion
21377.

Which of the following is an acidic salt?

Answer»

`NaH_2PO_2`
`NaH_2PO_3`
`NaH_2PO_2`
`Na_2H_2P_2O_7`

ANSWER :C
Discussion
21378.

The time required for 100% completion of a zero order reaction is

Answer»

ak
`(a)/(2K)`
`(a)/(k)`
`(2k)/(a)`

Solution :The TIME REQUIRED for the reaction to complete i.e., time at which [A] is zero
`t_("completion")=([A]_(0))/(K)=(a)/(k)`
Discussion
21379.

Write the name of the compound : [Co("en")_(2)Cl_(2)]SO_(4)

Answer»

Solution :Dichloro bis (ETHYLENE DIAMINE) Cobalt (III) SULPHATE.
Discussion
21380.

underset("starch")(2(C_6 H_10 O_5)_(n)) + H_2 O overset("Distance")(to)n A overset(H_2 O)(to) 2n B A and B in given sequence of reactions, respectively is

Answer»

MALTOSE, D-Glucose
Lactose, D-Glucose
Sucrose, D-Glucose
Maltose, fructose

Answer :A
Discussion
21381.

Which of the following give methyl alcohol with cold HBr

Answer»

`CH_3-O-CH_2-CH_2-CH_2-CH_3`
`CH_3-O-undersetunderset(CH_3)|oversetoverset(CH_3)|C-CH_3`
`CH_3-O-CH_2-oversetoverset(CH_3)|CH-CH_3`
`CH_3-O-undersetunderset(CH_3)|CH-CH_2-CH_3`

ANSWER :B
Discussion
21382.

Which of the following statemtns regarding oxidation and reduction are correct

Answer»

`CaCO_(3)`
`MgCO_(3)`
`NAOH`
`Mg(OH)_(2)`

Solution :Calcium CARBONATE magnesium carbonate an magnesium hyderoxide are important chemicals uses in the making of antacids to REDUCE indigestion
Discussion
21383.

Which of the following compounds is not an antacid ?

Answer»

ALUMINIUM hydroxide
Cimetidine 
PHENELZINE
Ranitidine 

SOLUTION :Phenelzine
Phenelzine is not ANTACID, it is anti-depresant.
Discussion
21384.

Which of the following can work as a dehydrating agent for alcohols

Answer»

`H_(2)SO_(4)`
`Al_(2)O_(3)`
`H_(3)PO_(4)`
All of these

Solution :`H_(2)SO_(4), Al_(2)O_(3) and H_(3)PO_(4)` all can ACT as DEHYDRATING AGENT.
Discussion
21385.

Which of the following can serve as a solvent for both ionic and covalent compounds?

Answer»

LIQUID AMMONIA
`H_2O`
Benzene
`"CCl"_4`

ANSWER :A
Discussion
21386.

The type of hybrid orbitals used by chlorine atom in ClO_(3)^(-) is

Answer»

`sp^(3)`
`sp^(2)`
`sp`
None of these

Solution :STRUCTURE of `ClO_(3)^(-)` is
Discussion
21387.

What is the rate equation for the reaction A+B rarrC has zero order ?

Answer»

RATE = k
Rate = k[A]
Rate = k[A] . [B]
Rate `k.(1)/([C])`

Answer :C
Discussion
21388.

What is meant by inversion of phase? Explain with example.

Answer»

Solution :(i) The change of W/O emulsion into O/W emulsion is CALLED inversion of phase.
(ii) Example:- An oil in water emulsion containing potassium soap as emulsifying agent can be converted into water in oil emulsion by ADDING `CaCl_(2) " (or) " AICI_(3)`. This is called inversion of phase.
Discussion
21389.

Which of the following statements is correct? Galvanic cell converts

Answer»

Chamical ENERGY into ELECTRICAL energy
Electrical energy into CHEMICAL energy
Metal from its elemental state to the COMBINED state
Electrolyte into individual ions

Solution :Galvanic CELL converts the chemical energy into electrical energy.
Discussion
21390.

Which of the following oxidation reactions can be carried out with chromic acid in aqueous acetone at 5-10^(@)C

Answer»

`CH_(3)(CH_(2))_(3)C -= C-underset(OH)underset(|)(CH)-CH_(3)rarr CH_(3)(CH_(2))_(3)C-=Coverset(O)overset(||)(-)C-CH_(3)`
`CH_(3)(CH_(2))_(3)CH=CH-CH_(2)OHrarr CH_(3)(CH_(2))_(3)CH=CH-CHO`
`C_(6)H_(5)CH_(3)rarr C_(6)H_(5)COOH`
`CH_(3)(CH_(2))_(3)CH_(2)OH rarr CH_(3)(CH_(2))_(3)CHO`

ANSWER :A::B::C::D
Discussion
21391.

Writethe names and structureof the monomers of the followingpolymers : (i)Terylene(ii) Buna - S (iii) Neoprene .

Answer»

Solution :(i) Monomers of Terylene are
`underset("ETHYLENE GLYCOL")(HOH_(2)C -CH_(2)OH)` and
(ii) Monomers of Buna -S are .
`underset("1,3-Butadiene")(CH_(2) = CH - CH = CH_(2)) and underset("Styrene")(C_(6)H_(5)CH = CH_(2))`
(III) Monomers of neoprene are .
`underset("2-Chloro-1,3-butadiene")underset("Chloroprene")(CH_(2) = overset(Cl)overset(|)(CH) - CH = CH_(2))` only
Discussion
21392.

Which element is generally used in the X-rays tube forproduction of X-ray and why ?

Answer»

SOLUTION :Molybdenum is used because it is a heavy element. When CATHODE rays HIT this element , X-rays are produced.
Discussion
21393.

Which of the following oxide shows electrical properties like metals?

Answer»

`SiO_(2)`
`MGO`
`SO_(2)(s)`
`CrO_(2)`

ANSWER :D
Discussion
21394.

To reduce 5 gram equivalents of cupric ions (Cu^(2+)) to solid copper metal (Cu) , the number of Faradays of electriclty required would be

Answer»

10 F
2 F
20 F
5 F

Solution :1 g EQUIVALENT of `Cu^(2+)` requires of DEPOSITE 1 Faraday.
Discussion
21395.

Which of the following is the major cause of global warming?

Answer»

re-radiation of U.V. rayd by `CO_(2) and H_(2)O`
re-radiation of I.R. rays by `CO_(2) and H_(2)O`
re-radiation of I.R. rays by `O_(2) and N_(2)`
re-radiation of U.V. rays by `O_(2) and N_(2)`

Answer :B
Discussion
21396.

What do you mean by selectivity of a catalyst?

Answer»

Solution :It is THEABILITY of CATALYST to DIRECT are action to yeild a PARTICULAR product.
Discussion
21397.

Why cannot vitamin C be stored in our body?

Answer»

Solution : Being water soluble, VITAMIN C is readily EXCRETED in urine and HENCE cannot be STORED in the body.
Discussion
21398.

Thus emf of the cell = 0.91 V. Q.3.6. The cell in which the following reaction occurs :2Fe^(3+) (aq) + 2I^(-)(aq) to 2Fe^(2+0 (aq)+ I_(2)(s) has E_("cell")^(@) = 0.236 V at 298 K Calculate the standard Gibbs energy and the equilibrium constant of the cell reaction.

Answer»

Solution :The REACTIONS taking place in the cell may be written as under:
`2Fe^(3+) + 2e^(-) to 2Fe^(2+)` or `2I^(-) to I_(2) + 2e^(-)`
THUS, for the given cell reaction, n = 2. Using the following EQUATION and substituting the values, we get
`Delta_(r)G^(@) =-nFE_("cell")^(@) =-2 xx 96500 xx 0.236 J = -45.55 kJ mol^(-1)`
Now, using the following relation to calculate cquilibrium CONSTANT
`Delta_(r)G^(@) = -2.303 RT log K_( C)`
or `K_( C) "antilog" (7.983) = 9.616 xx 10^(7)`
Discussion
21399.

Which of the following is true for Henrys constant

Answer»

It DECREASES with TEMPERATURE
It INCREASES with temperature
Independent on temperature
It do not depend on NATURE of gases.

Answer :B
Discussion
21400.

What is the order of the reaction for which the rate constant has a unit ofmol.L ^(1).s^(-1) ?

Answer»

Solution :The UNIT of rate constant for a reaction with ordern is `("mol.L"^(-1))^(1-n).s^(-1)`Comparing this unit with the unit of rate constant GIVEN , we have , 1 - n = 1 or, n = 0
So, the reaction has an order of zero.
Discussion