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3051.

Which of the following is false about redox reactions in a cell ?

Answer»

electrical energy is generated
reactions is not completed
OXIDATION and REDUCTION can take place in different containers
REDOX REACTION donot take place simltaneously

Solution :Redox=Reduction+Oxidation.
Discussion
3052.

Which of the following compounds will be formed when aniline reacts with H_2SO_5 ?

Answer»




ANSWER :C
Discussion
3053.

The solubility of CuBr is 2 xx 10^(-4) mol/at 25^(@)C. The K_(sp) value for CuBr is

Answer»

`4 xx 10^(-8) mol^(2) L^(-2)`
`4 xx 10^(-11) mol^(2) L^(-1)`
`4 xx 10^(-4) mol^(2) l^(-2)`
`4 xx 10^(-15) mol^(2) l^(-2)`

Solution :`{:(CuBr,hArr,Cu^(+),+,Br^(-)),(K_(SP),,(S),,(S)):}`
`K_(sp) = S^(2) = (2 xx 10^(-4))^(2) = 4 xx 10^(-8)(mol^(2))/(l^(2))`
Discussion
3054.

Which of the following is the general electronic configuration of lanthanoids?

Answer»

`[Xe] 4f^(7) 3d^(1-10) 5s^(2)`
`[Xe] 4f^(1-14) 3d^(10) 6S^(2)`
`[Xe] 5f^(2-14) 4D^(10) 6s^(2)`
`[Xe] 4f^(2-14) 4d^(0-1) 6s^(2)`

Solution :`[Xe] 4f^(2-14) 4d^(0-1) 6s^(2)`
Discussion
3055.

Which of the following statements regarding sulphur is incorrect?

Answer»

At `600^(@)C` the gas mainly CONSISTS of `S_(2)` molecules.
The OXIDATION state of sulphur is never less than `+4` in its compounds.
`S_(2)` molecule is paramagnetic.
The VAPOUR at `200^(@)C` consists mostly of `S_(8)` rings.

Solution :The oxidation state of S in its compounds VARIES from `-2" to "+6`.
Discussion
3056.

What happens when H_3PO_(3) is heated ?

Answer»

SOLUTION :When HEATED, `H_3PO_3` DISPROPORTIONATES to FORM phosphine and orthophosphoric acid.
`underset(+3)(4H_(3)PO_(3)) to underset(+5)(3H_(3)PO_(4)) + underset(-3)(PH_(3))`
Discussion
3057.

Which one of the following carbon compounds will not give a sooty flame ?

Answer»

BENZENE
HEXANE
Naphthalene
Anthracene

Solution :Hexane do not give flame as it is ALKANE and SATURATED compound where as Benzene, naphthalene and Anthhracene are aromatic and unsaturated so they give sooty flame.
Discussion
3058.

Which of the following will be obtained by keeping ether incontact with air for a long time

Answer»

`C_(2)H_(5)-O-CH(CH_(3))-O-OH`
`C_(2)H_(5)-O-C_(2)H_(5)OH`
`C_(2)H_(5)-O-C_(2)H_(5)OH`
`CH_(3)-OCH(CH_(3))-O-OH`

SOLUTION :`R-O-R'overset(O_(2)//"light")to C_(2)H_(5)-O-CH(CH_(3))-O-OH`
Discussion
3059.

Which of the following are not coloured due lo charge transfer

Answer»

`K_(2)Cr_(2)O_(7)`
`KMnO_(4)`
`[Fe(H_2O)_5NO]SO_4`
`MnO_2`

Solution :`[Fe(H_2O)_5NO]SO_4` shows brown COLOUR due to d-d TRANSITION
Discussion
3060.

Wrong statement of the following regadring (A) Cyanides and (B) Isocyanides is

Answer»

A are POLAR compounds
A have pleagant odour
A are stronger BASES than amines
B boil at low TEMPERATURE than A

Answer :C
Discussion
3061.

Which one among the following is a thermosetting plastic :

Answer»

PVC
PVA
Bakelite
NONE of these

Answer :C
Discussion
3062.

Which of the following is correct for lyophilic sol ?

Answer»

They are irreversible.
They are FORMED by INORGANIC substances.
They are READILY COAGULATED by ADDITION of electrolytes.
They are self-stabilized.

Answer :D
Discussion
3063.

The wavelength of photoelectric threshold energy of a metal is 230 nm . Determine the K.E. of the photoelectron ejected from the surface by U.V. radiation emitted from the 2^(nd) longest wavelength transition ( downward ) of electron in Lymann series of atomic spectrum of hydrogen.( R = 1.09677 xx 10^(7) m^(-1) )

Answer»


ANSWER :`1.074 XX 10^(-18)J`
Discussion
3064.

What volume of water is required (in mL) to prepare 1 L of 1 M solution of H_(2)SO_(4) (density = 1.5g/mL) by using 109% oleum and water only (Take density of pure water = 1g/mL).

Answer»

Solution :1 MOLE `H_(2)SO_(4)` in 1 L solution = 98 g`H_(2)SO_(4)` in 1500 g solution = 98 g `H_(2)SO_(4)` in 1402 g water.
Also, in 109% oleum, 9 g `H_(2)O` is required to form 109 g pure `H_(2)SO_(4)` & so, to prepare 98 g `H_(2)SO_(4)`, water needed is 9/109 `xx 98 = 8.09 g.`
Total water needed = 1402 + 8.09 = 1410.09 g = 1410.09 mL
Discussion
3065.

The value of triangle_(f)G^(0) for formation of Cr_(2)O_(3)" is "-540 kJ mol^(-1)" and that of "Al_(2)O_(3)" is "-827 kJ mol^(-1). Is the reduction of Cr_(2)O_(3) possible with Al?

Answer»

Solution :The two THERMOCHEMICAL equations can be written as :
`{:((4)/(3)Al(s)+O_(2)(G)to(2)/(3)Al_(2)O_(3)(s),triangle_(f)G_(Al,Al_(2)O_(3))^(0)= -827 kJ mol^(-1)"""......."(i)),((4)/(3)Cr(s)+O_(2)(g)to(2)/(3)Cr_(2)O_(3)(s),triangle_(f)G^(0)= -540kJ mol^(-1)"""........"(ii)):}`
Subtracting equation (ii) from equation (i), we get
`(4)/(3)Al(s)+(2)/(3) Cr_(2)O_(3)(s) to (2)/(3)Al_(2)O_(3)(s)+(4)/(3)Cr(s), triangle_(r )G^(0) = -287 kJ mol^(-1)`
As `triangle(r )G^(0)` of the COMBINED redox reaction is -ve, therefore, reduction of `Cr_(2)O_(3)` by Al is possible.
Discussion
3066.

Which of the following is not a pseudohalide

Answer»

`RCOO^(-)`
`CN^(-)`
`CNO^(-)`
`N_3^(-)`

ANSWER :A
Discussion
3067.

Which kind of isomerism is exhibited by octahedral [Co(NH_(3))_(4)Br_(2)Cl ?

Answer»

GEOMETRICAL and ionization
Geometrical and OPTICAL
Optical and ionization
Geometrical only

Answer :A
Discussion
3068.

Which of these is not a monomer for a high molecular mass silicone polymer ?

Answer»

`Me_(3)SICL`
`PhSiCl_(3)`
`MeSiCl_(3)`
`Me_(2)SiCl_(2)`

ANSWER :A::C
Discussion
3069.

Which statement is correct about Henry's law ?

Answer»

The AMOUNT of gas dissolved per UNIT volume of solvent is DIRECTLY propotional to pressure of gas.
The amount of gas dissolved per unit volume of solvent is directly independent to pressure of gas.
The law is valid only when the gas dissolved NEITHER dissociates nor associates in solvent
All of the above

Answer :D
Discussion
3070.

Write the formulas for the following coordination compounds : Dichloridobis(ethane-1, 2-diamine)platinum(IV) nitrate

Answer»

SOLUTION :`[PtCl_(2)(EN)_(2)](NO_(3))_(2)`
Discussion
3071.

Which of the following contains a lipid?

Answer»

Starch
MINERAL oil
EDIBLE oil
PEPTIDE

Solution : Edible oil
Discussion
3072.

Which one of the following is the correct set with respect to molecule, hybridization and shape ?

Answer»

`BeCl_(2),sp^(2)`, linear
`BeCl_(2),sp^(2)`, triangular planar
`BCl_(3),sp^(2)`, triangular planar
`BCl_(3),sp^(3)`, tetrahedral

Answer :C
Discussion
3073.

What is the order of a reaction if the rate constant has the units "L.mol:"^(-1).s^(-1)?

Answer»

zero
First
Second
Third

Answer :C
Discussion
3074.

Which of the following carbocation is most stable

Answer»




ANSWER :D
Discussion
3075.

The total number of optical isomers possible for 2,3-dibromobutane is

Answer»

2
4
0
3

Solution :`CH_(3)-overset(**)(C)HBr-overset(**)(C)Br-CH_(3)`
2,3-Dibromobutane has two similar CHIRAL carbon ATOMS and HENCE has `2^(@)-1=3` optical isomers, i.e., (+), (-) and meso.
Discussion
3076.

Which of the following imparts green colour to the burner flame

Answer»

`B(Ome)_(3)`
`Na(OM E)`
`Al(OP r)_(3)`
`Sn(OH)_(2)`

Answer :A
Discussion
3077.

What is the percentage of carbon in : cast iron, wrought iron and steel?

Answer»

Solution :PERCENTAGE of carbon in cast iron is 2 to 4.5% WROUGHT iron is `0.12-0.25%` and STEEL is 0.25 to 2%.
Discussion
3078.

Which of the following is a natural source of air pollution?

Answer»

Volcanic ERUPTIONS and lightening discharges
Biological decay of vegetable matter
Photochemical OXIDATION of ORGANIC matter
All of the above

Answer :D
Discussion
3079.

What is the difference between conductivity and specific conductance ?

Answer»

SOLUTION :Conductivity of a substance is its conductance when it is 1 m long and its AREA of cross-section is `1 m^2`. SPECIFIC conductance is the same thing as conductivity. IUPAC now recommends the USE of term conductivity in place of specific conductance.
Discussion
3080.

Which of the following is correctly matched with the given property?

Answer»

`underset("(Solubility in water)")(MgSO_(4) lt CaSO_(4) lt SrSO_(4))lt BaSO_(4)`
`underset("(THERMAL STABILITY)")(BeCO_(3)gt MgCO_(3) gt CaCO_(3)) gt SrCO_(3) gt BaCO_(3)`
`underset("(Oxidising nature)")(NaOCl gt NaOBr gt NaOl)`
`underset("(Bond energy)")(F_(2) gt Cl_(2) gt Br_(2) gt l_(2))`

Answer :C
Discussion
3081.

The resistance of 1N solution of acetic acid is 250 ohm when measured in a cell of cell constant 1.15cm^(-1). The equivalent conductance ( in ohm^(-1)cm^(2)equi^(-1) ) of 1N acetic acid is

Answer»

4.6
9.2
18.4
0.023

Answer :A
Discussion
3082.

Which of the following compounds would have the smallest value for PK_a ?

Answer»

`CHF_2 CH_2 CH_2 COOH`
`CH_3 CH_2 CF_2 COOH`
`CH_2 FCHF CH_2 COOH`
`CH_3 CF_2CH_2 COOH`

ANSWER :B
Discussion
3083.

Using IUPAC norms write the formulas for the following: Hexaamminecobalt(III) sulphate

Answer»

SOLUTION :`[CO(NH_(3))_(6)]_(2)(SO_(4))_(3)`
Discussion
3084.

Which of the following alkyl halide is used as a methylating agent

Answer»

`CH_(3)I`<BR>`C_(2)H_(5)Br`
`C_(2)H_(5)CL`
`C_(6)H_(5)Cl`

Answer :A
Discussion
3085.

Which of the following belong to the actinide series of elements ?

Answer»

Y
Ta
U
Lu

Answer :C
Discussion
3086.

Which one of the following inhibits the bacterial growth?

Answer»

<P>p - AMINO BENZOIC acid
SULPHANILAMIDE
folic cid
sodium benzoate

Solution : sulphanilamide
Discussion
3087.

Which of the following is paracetamol ?

Answer»




ANSWER :B
Discussion
3088.

When formic acid donates the proton from its oxygen to a base, a formate ion is the result. Write another resonance structure for formic acid and for the formate ion. Which species, formic acid or the formate ion, would be most stabilized by resonance?

Answer»

Solution :The reaction is

The resonance STRUCTURES of formic ACID and formate ion are as follows. Out of these the resonance structure of formate ion is more STABLE as in formic acid structure positive charge on electronegative O ATOM destabilizes the structure.
Discussion
3089.

Which of the following does not cause pollution

Answer»

HYDROELECTRIC schemes
Automobiles
Nuclear energy project
THERMAL power project

Solution :Automobiles and thermal power plants CAUSE AIR pollution. Radioactive power plants are the source of radioactive pollution and thermal pollution
Discussion
3090.

When 6 gm urea dissolve in 18 gm H_(2)O. The mole fraction of urea is

Answer»

`(10)/(10.1)`
`(10.1)/(10)`
`(10.1)/(0.1)`
`(0.1)/(10.1)`

Solution :Mole FRACTION `X=(N)/(n + N)=((6)/(60))/((6)/(60)+(180)/(18))=(0.1)/(10.1)`.
Discussion
3091.

Which one of the following is most stable?

Answer»




ANSWER :A
Discussion
3092.

What are antipyretic medicines ? Name one of them. Can it play any other role also ?

Answer»

Solution :ANTIPYRETICS are medicines which BRING down the TEMPERATURE of feveral body. For EXAMPLE, phenacetin. They act as analgesics (pain reliever) ALSO.
Discussion
3093.

When a car is running, its battery gets charged. How?

Answer»

SOLUTION :In an automobile, when it is running, ELECTRICAL energy is produced in the alternator which KEEPS on charging the BATTERY.
Discussion
3094.

The wave number of radiation of wavelength 500 nm is:

Answer»

`5xx10^(-7) m^(-1)`
`2XX10^(7) m^(-1)`
`2xx10^(6) m^(-1)`
`500xx10^(-9) m^(-1)`

ANSWER :C
Discussion
3095.

Which of the following polymer is an example of fibre

Answer»

SILK
DACRON
NYLON 66
All of these

Answer :D
Discussion
3096.

Which of the following is an ore of tin ?

Answer»

Carborundum
Epsomite
CASSITERITE
Spodumene

SOLUTION :Carborundum-SiC
EpsomiteorEpsomsalt`- MG SO_4. 7 H_2 O`
Cassiterite-` SnO_2`
spodumene- Oreof lithium
Discussion
3097.

Which of the following statement would be INCORRECT about this compound ?

Answer»

All THREE C-N bond are of same length
`C_1 -N and C_3-N` bonds are of same length but shorter than `C_5-N` bond
`C_1 -N and C_5-N` bonds are of same length but longer than `C_3-N` bond
`C_1 -N and C_5-N` bonds are of same length but both longer than `C_3-N` bond

SOLUTION :Due to steric HINDERANCE of three groups `-NO_2` GROUP go out of the plane with benzene ring and so conjugation of `-NO_2` group with benzene is slightly diminished.So bond length of `C_1-N` & `C_5-N` is more than `C_3-N`
Discussion
3098.

Which one of the following is a bio-degradable polymer?

Answer»

HDPE
PVC
NYLON 6
PHBV

SOLUTION :PHBV
Discussion
3099.

Which ion is paramagnetic:

Answer»

`[Ni(NH_3)_4]^(2+)`
`[Ni(CO)_4]`
`[Co(NH_3)_6]^(3+)`
`[Ni(CN)_4]^(2-)`

ANSWER :A
Discussion
3100.

Which of the following compound will not give yelow ppt with iodine and alkali

Answer»

ETHANOL
ETHANAL
1-propanol
2-propanol

ANSWER :C
Discussion