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2901.

Which one is covalent ?

Answer»

`BF_3`
`AlF_3`
`CaF_2`
`TlF_3`

ANSWER :A
Discussion
2902.

Which of the following is the most unsymmetrical lattice?

Answer»

Monoclinic
Rhombohedral
Triclinic
All of the above

Answer :C
Discussion
2903.

Which of the following is called Lewis acid in [Ni(Co)_(4)]?

Answer»

`NI^(2+)`
`CO`
`Ni^(4+)`
`Co^(-)`

Answer :A::B
Discussion
2904.

Which of the following isotope of hydrogen is radioactive ?

Answer»

`._(83)BI^(209)`
`._(82)Pb^(210)`
`._(6)C^(12)`
`._(82)Pb^(206)`

Answer :B
Discussion
2905.

The reagent used to convert ArN_(2)^(+)Cl^(-) to ArH is ___________.

Answer»


ANSWER :`H_(3)PO_(2)`
Discussion
2906.

The required charge for one equivalent weight of silver deposited on cathode is

Answer»

`9.65xx10^(7)C`
`9.65xx10^(4)C`
`9.65xx10^(3)C`
`9.65xx10^(5)C`

Solution :for DEPOSITION of one EQUIVALENT silver required CHARGED is 96500C.
Discussion
2907.

Which arrangements shows schematic alignment of magnetic moments of antiferromagnetic substances-

Answer»




ANSWER :D
Discussion
2908.

Two reactions A toProducts and B toProducts, have rate constants k_(A) and k_(B) at temperature T and activation energies E_(a) and E_(b) respectively. If k_(A) gt k_(B) and E_(a) lt E_(b) and assuming that pre-exponential factor (A) for both the reactions is same then

Answer»

at higher temperatures `k_(A)` will be greater than `k_(B)`
at LOWER temperatures `k_(A)` and `k_(B)` will be close to each other in magnitude
as temperature rises `k_(A)` and `k_(B)` will be close to each other in magnitude
at lower temperature `k_(B) GT k_(A)`

Answer :A::C
Discussion
2909.

Which of the following is not an example of ionic hydride ?

Answer»

LIH
CSH
NAH
`BeH_2`

ANSWER :D
Discussion
2910.

Which one of the following is an outer orbital complex and exhibits paramagnetic behaviour?

Answer»

`[NI(NH_(3))_(6)]^(2+)`
`[Zn(NH_(3))_(6)]^(2+)`
`[Cr(NH_(3))_(6)]^(3+)`
`[Co(NH_(3))_(6)]^(3+)`

Solution :In `[Ni(NH_(3))_(6)]^(2+), Ni^(2+)` is `3D^(8)`. Its ELECTRONIC configuration is

Thus, hybridization is `sp^(3)d^(2)` giving outer ORBITAL complex which is paramagnetic.
Discussion
2911.

The test to distinguish HCOOH and CH_(3)COOH is/are _______.

Answer»

TOLLENS REAGENT test
Litmus test
Sodium BICARBONATE test
both (B) and ( c)

Answer :A
Discussion
2912.

Which shows non-directional bonding :

Answer»

`BCl_3`
CSCL
` NCl_3`
` BeCl_2`

ANSWER :B
Discussion
2913.

Write the cathodic and anodic cell reactions of Hydrogen -Oxygen fuel cell.

Answer»

Solution :CATHODE :
`O_(2(g))+2H_(2)O_((l))+4e^(-)RARR 4OH_((aq))^(-)`
Anode :
`2H_(2(g))+4OH_((aq))^(-)rarr 3H_(2)O_((l))+4e^(-)`
Discussion
2914.

What will be the effect of adding 100 mL of 10^(-3) M HCl solution to a solution of HA having concentration 0.1 M ? (K_a of HA=10^(-5))

Answer»

DEGREE of dissociation of HA will DECREASE, PH will remain constant
Degree of dissociation of HA will INCREASE and pH decreases
Neither pH nor degree of dissociation of HA will change .
Both degree of dissociation and pH will decrease

Answer :C
Discussion
2915.

Which one is byproduct of saponification ?

Answer»

Ethanol
Ethane 1-2-diul
Propane-1,2,3-uiol
All of the GIVEN 

SOLUTION :Propane-1,2,3-triol
Discussion
2916.

Which of the following compounds would give alcohol on reduction by LiAlH_(4)//Et_(2)O//H_(3)O^(+)

Answer»




ANSWER :A,B,C,D
Discussion
2917.

Which of the following compounds would not evolve CO_(2) when treated with aq. NaHCO_(3) solution?

Answer»

Phenol
Benzoic ACID
2,4- Dinitrophenol
2,4,6-Trinitrophenol

Answer :A
Discussion
2918.

Which reaction involved in ostwald process ?

Answer»

OXIDATION of AMMONIA in presence of PT catalyst.
Hydrogenation of vegetable OIL in presence of NI catalyst.
Oxidation of NO by `O_2` in presence of NO catalst.
Oxidation of `SO_2` by `O_2` in presence of Pt catalyst.

Answer :A
Discussion
2919.

Which of the following undergoesdisproportionation reaction?

Answer»

`MnO_(4)^(-)`
`MnO_(4)^(2-)`
`Mn_(2)O_(3)`
`MnO_(2)`

ANSWER :B
Discussion
2920.

Which of the following influences the rate of a chemical reactions performed in soution?

Answer»

Temperature
Activation ENERGY
PRESENCE of a catalyst
All of the above INFLUENCE the rate

Answer :D
Discussion
2921.

Transition elements are:

Answer»

All METALS
All non-metals
Metals and non-metals
Gases

Answer :A
Discussion
2922.

WhenKMnO_(4) solution is added to oxalic acid solution, the decolourisation is slow in the beginning but becomes instantaneous after some time because:

Answer»

`CO_(2)` is FORMED as the products
Reaction is EXOTHERMIC
`MnO_(4)^(-)`catalysis the reaction
`MN^(2+)` acts as autocatalyst

Answer :d
Discussion
2923.

The system PCl_(5)(s)hArr PCl_(3)(g)+Cl_(2)(g)attains equilibrium. If the equilibrium concentration of PCl_(3)(g)is doubled, the concentration of Cl_(2)(g) would become :

Answer»

1/4 of its INITIAL VALUE
1/2 of its initial value
TWICE of its initial value
unpredictable

Answer :B
Discussion
2924.

Whichoneof the following is calledmilk sugar ?

Answer»


ANSWER :C
Discussion
2925.

Which of the following statement is NOT CORRECT with respect to a voltaic cell ?

Answer»

ANODE is NEGATIVELY charged
Cathode is POSITIVELY charged
Reduction TAKES PLACE at the cathode
Reduction takes place at the anode

Answer :D
Discussion
2926.

Which of the following compound shows optical isomerism?

Answer»

`[Cu(NH_3)_4]^(2+)`
`[ZN(Cl)_4]^(2-)`
`[CR(C_2O_4)_3]^(2-)`
`[Co(CN)_6]^(3-)`

ANSWER :C
Discussion
2927.

The standarde.m.f. of a cell involving one electron charge is found to be 0.591V at 25^(@)C the equilibrium constant of the reaction is (F=96500C "mol"^(-1):R=8.314 JK^(-1)"mol"^(-1))

Answer»

`1.0xx10^(1)`
`1.0xx10^(30)`
`1.0xx10^(10)`
`1.0xx10^(5)`

SOLUTION :At 298
`E^(@)=(0.0591)/(N)"log" k_(c)`
`0.591=(0.0591)/(1)"log"K_(c)`
`"log" k_(c)=(0.5910)/(0.0591)`
` "log"k_(c)=10`
`K_(c)=10^(10)`
Discussion
2928.

Which one is used as preservatives for fresh vegetables and fruits

Answer»

PALMITIC acid
Palm OIL
SODIUM META SULPHITE
sulphur dioxide

Solution :sodium meta sulphite
Discussion
2929.

Which of the following haslargest dipole moment ?

Answer»

`CH_4 `
`NF_3`
`CF_4`
`NH_3 `

ANSWER :D
Discussion
2930.

Which among the following statements are true for glycine? 1. It exists in crsytalline form 2. It is optically active 3. It is soluble in water 4. It can form Zwitter ions

Answer»

1, 2 and 3
1, 2 and 4
1, 3 and 4
2, 3 and 4

Answer :C
Discussion
2931.

Write one difference in the following : Lyophobic sol and Lyophilic sol.

Answer»

Solution :LYOPHOBIC sol and Lyophilic sol : When SIMPLY mixed with the solvent, the lyophilic sols form COLLOIDAL solution. Lyophobic sols are not easily FORMED by simply MIXING with the solvent Lyophilic sols are reversible but lyophobic sols are irreversible.
Discussion
2932.

Which of the following are coloureddue to the charge transfer ?

Answer»

`KMnO_(4)`
`K_(2)Cr_(2)O_(7)`
`[FE(H_(2)O)_(5)NO]SO_(4)`
`Fe[Fe(CN)_(6)]_(3)`

SOLUTION :(d) is coloured due to MLCT spectra.
Discussion
2933.

Which one of the following is most basic?

Answer»

2,4-dichloroaniline
2,4-dimethyl aniline
2,4-dinitroaniline
2,4-dibromoaniline

Solution :`CH_(3)` is a +I GROUP, all other -I group. +I group increase the electron density on `NH_(2)` and hence INCREASES the basic nature.
Discussion
2934.

Which of the following method is not employed for the purification of colloids ?

Answer»

Electrodialysis
Dialysis
Ultracentrifugation
Peptisation

Answer :D
Discussion
2935.

Which of the following processes involves smelting process ?

Answer»

`ZnCO_3 rarr ZnO +CO_2`
`Fe_2O_3 +3CO rarr 2Fe+3CO`-2
`2PbS+3O_2 rarr 2PbO +2O_2`
`Al_2 O_3 .2H_2O rarr Al_2O_3 + 2H_2O`

ANSWER :B
Discussion
2936.

The symbol of an isotope is ._(32)X^(65), this reveals that

Answer»

It atomic NUMBER is 32 and atomic weight is 65
Its atomic number is 65
It has 65 electrons
It has 32 neutrons

Solution :In ISOTOPE `._(32)X^(65)`, 32 is atomic number and 65 is atomic weight
Discussion
2937.

Which one of the following is one of the cross end products formed when a mixture of acetone and acetaldehyde is heated after treating with aqueous sodium hydroxide?

Answer»

` (CH_3) _2C= CH -CHO `
` (CH_3)C (OH) =CHCOCH_3`
` CH_3-CH=CH-CHO`
` (CH_3)_2CH(OH) CH_2CO-CH_3`

ANSWER :A
Discussion
2938.

Which one of the following statement for order of reaction is not correct

Answer»

Order can be determined experimentally
Order of reaction is equal tosum of the POWERS of concentration TERMS in differential RATE law
It is not affected with the stoichiometric coefficient of the REACTANTS
Order cannot be fractional

Solution :Order OFA reaction can be fractional . Rest of all are true.
Discussion
2939.

The weakest base among the following is :

Answer»

`H^-`
`CH_3^-`
`CH_3O^-`
`CL^-`

ANSWER :D
Discussion
2940.

Volume occupied by one molecule of water (density = 1 g cm^(-3)) is

Answer»

`9.0xx10^(-23)cm^(3)`
`6.023xx10^(-23)cm^(3)`
`3.xx10^(-23)cm^(3)`
`5.5xx10^(-23)cm^(3)`

Solution :`"1 mole of "H_(2)O=6.02xx10^(23)" molecules"`
`=18 g = 18 cm^(3)`
`therefore" Volume OCCUPIED by 1 molecule of "H_(2)O`
`=(18)/(6.02xx10^(23))cm^(3)=3xx10^(-23)cm^(3)`
Discussion
2941.

Which of the following compounds has the highest boiling point ?

Answer»

`CH_(3)CH_(2)CH_(2)Cl`
`CH_(3)CH_(2)CH_(2)CH_(2)Cl`
`CH_(3)CH(CH_(3))CH_(2)Cl`
`(CH_(3))C Cl`

SOLUTION :For isomeric halides, boiling POINT DECREASES with branching. So `CH_(3)CH_(2)CH_(2)CH_(2)Cl` has highest boiling point.
Discussion
2942.

The volume of the hexagonal prism is (radius of every sphere is r)

Answer»

`24sqrt2r^(3)`
`16sqrt2r^(3)`
`12sqrt2r^(3)`
`64/(3sqrt3)r^(3)`

SOLUTION :CALCULATE BASE area and height from the FIGURES:
Discussion
2943.

Write the IUPAC name of .

Answer»

SOLUTION :Methyl-2-methylbenzoate.
Discussion
2944.

Which artificial sweetener contains chlorine ?

Answer»

Sucralose
Alitame
Aspartame
Saccharin

Solution :
Discussion
2945.

The stop cock connecting the wo bulbs of equal volume at pressure 2 atm and 1 atm is opened at constant temperature then

Answer»

the final PRESSURE will BECOME 3 atm
`(1)/(4)`th gas from bulb 1 will be transferred to bulb 2
`(1)/(2)` ART of the gas present initially in bulb 2 will be added into bulb 2
`(1)/(4)`th of the gas present initially in biulb 2 will be added into bulb 2

ANSWER :A
Discussion
2946.

The resistance of an aqueous solution containing 0.624 g of CuSO_(4).5H_(2)O per 100 cm^(3) of the solution in a conductance cell of cell constant 153.7 pr metre is 520 ogms at 298 K. Calculate the molar conductivity. (CuSO_(4).5H_(2)O = 249.5)

Answer»

SOLUTION :`118.2 "MHO CM"^(2)`
Discussion
2947.

Which of the following halides does not exist?

Answer»

`SbF_(5)`
`PF_(5)`
`NF_(5)`
`AsF_(5).`

Solution :Nitrogen cannot EXTEND its OCTET.
Discussion
2948.

Which statement is incorrect about osmotic pressure (pi), volume (V) and temperature (T):

Answer»

`pi prop (1)/(V)` if T is constant
`pi prop T` if V is constant
`pi prop V` if T is constant
`pi V` is constant if T is constant

Solution :`(5)/(342) = (0.877)/(X) X = 59.98`
Discussion
2949.

Which is/are insoluble in NH_(3) solution?

Answer»

AgCl
AgBr
AgI
`Ag_(2)S`

ANSWER :C::D
Discussion
2950.

The value of ebullioscopic constant depend upon

Answer»

`DELTA H_(SOLUTION)`
NATURE of solvent
Nature of solute
Freezing POINT of solution

Answer :B
Discussion