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7251.

Which of the following compounds have some solubility in water ?

Answer»




SOLUTION :
Discussion
7252.

Which compound will liberate CO_(2) from NaHCO_(3) ?

Answer»

`CH_(3)CONH_(2)`
`CH_(3)NH_(2)`
`(CH_(3))_(4)N^(+)OH^(-)`
`CH_(3)N^(+)H_(3)Cl^(-)`

ANSWER :D
Discussion
7253.

What is the effect of temperature and pressure on the adsorption of gas over the solid surface?

Answer»

Solution :As PERSON INCREASES adsorption increases, as TEMPERATURE increases adsorption DECREASES.
Discussion
7254.

What happens when phosphine is passed through AgNO_3 Solution ? Give equation..

Answer»

Solution :When phosphine is PASSED through `AgNO_3` solution, silver PHOSPHIDE is PRECIPITATED, which is again REDUCED to METALLIC silver.
Discussion
7255.

The standard electrode potantials of the half cells Ag^(+)//Ag and Fe^(3+),Fe^(2+)//Pt are 0.7991V and 0.771V respectively. Calculate the equilibrium constant of the reaction : Ag_((s))+Fe^(3+)hArr Ag^(+)+Fe^(2+)

Answer»

Solution :The cell formed is `AG//Ag^(+),Fe^(3+),Fe^(2+)//Pt`
`"At anode :"Ag(s)rarr Ag^(+)+E`
`"At cathode :"Fe^(3+)+e rarr Fe^(2+)`
`"Overall reaction :"Ag_((s))+Fe^(3+)rarr Fe^(2+)+Ag^(+)`
emf of the cell is GIVEN by `(E_(R)-E_(L))`
`E_("cell")^(@)=0.771-0.7991=-0.0281V`
At equilibrium, `E_("cell")=E_("cell")^(@)-(RT)/(nF)ln""(a_(Ag)+a_(Fe^(2+)))/(a_(Fe^(3+)))`
Since activity of solid silver is 1.0.
`thereforen=1 andK_(eq)=(a_(Ag^(+))+a_(Fe^(2+)))/(a_(Fe^(3+)))`
`therefore E_("cell")^(@)=(0.0591)/(n)logK_(eq)`
`therefore logK_(eq)=(0.0281xx1)/(0.0591)=0.4751`
`therefore K_(eq)=0.335`
Discussion
7256.

The % yield of ammonia as a function of time in the reaction N_(2)(g) + 3H_(2)(g)hArr2NH_(3)(g), (g) DeltaH < 0 at (P, T_(1)) is given below

Answer»




ANSWER :B
Discussion
7257.

Which of the following is removed from food during irradiation?

Answer»

 Water
Micro-organisms
Enzymes
Oxidants

Answer :B
Discussion
7258.

When adenosine binds to the adenosine receptors, it induces..............

Answer»

SOLUTION :SLEEPINESS
Discussion
7259.

Which of the following can form geometrical isomer?

Answer»


`CH_(3)-CH=N-OH`

All of these

Answer :D
Discussion
7260.

The sugar present in fruits is :

Answer»

Fructose
Glucose
Sucrose
GALACTOSE

ANSWER :A
Discussion
7261.

The stable O.S. of uranium is

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`+3`
`+4`
`+5`
`+6`

ANSWER :D
Discussion
7262.

The reddish brown gas produced by heating KCl with K_(2)Cr_(2)O_(7) (solid) and conc. H_(2)SO_(4) is

Answer»

`Cl_(2)`
`CrO_(2)Cl_(2)`
`CrO_(3)`
`H_(2)CrO_(4)`

Solution :`K_(2)Cr_(2)O_(7)+6H_(2)SO_(4)+4KClrarrunderset("Reddish brown")(2CrO_(2)Cl_(2)uarr)+6KHSO_(4)+3H_(2)O`
Discussion
7263.

Which of the following compound willgive ketone on oxidation ?

Answer»

`CH_3CH_2CH_2OH`
`CH_3CH_2CH(OH)CH_3`
`(CH_3)_3COH`
`(CH_3)_2CH_2CH_2OH`

ANSWER :B
Discussion
7264.

The repeating unit in silicone is

Answer»

`SiO_(2)`
`-OVERSET(R )overset(|)underset(R )underset(|)Si-O-`
`R-O-overset(|)underset(R )underset(|)Si-O`
`-underset(R )underset(|)overset(|)Si-O-O-R`

Solution :`-overset(R )overset(|)underset(R )underset(|)Si-O-`
Discussion
7265.

Which of the following acts as electrophile well as nucleophile ?

Answer»

`CH_(3)-N^(+)equivC^(-)`
`CH_(2)=O`
`H_(3)N :`
`BeCl_(2)`

Solution :
Discussion
7266.

What happens when an emulsion is centrifuged ?

Answer»

Solution :The EMULSION BREAKS down on centrifugation. We obtain the components of the emulsion SEPARATELY.
Discussion
7267.

Which one contains both iron and copper ?

Answer»

CUPRITE
CHALCOCITE
Chalcopyrite
MALACHITE

Answer :C
Discussion
7268.

What are amorphous solid ? Give example.

Answer»

Solution :In an AMORPHOUS solid, the constituents are RANDOMLY ARRANGED. It is a short RANGE arrangement of constituents. EG : Glass.
Discussion
7269.

Which statement(s) about coordination of cation is/are true ?

Answer»

Most metal ions exhibit only a SINGLE characteristic COORDINATION number
The coordination number is equal to the number of ligands bonded to the metal atom
The coordination number is determined solely by the tendency to surround the metal atom with the same number of electrons as one of the RARE gases.
For most cations, the coordination number depends on the SIZE, structure and CHARGE of the liagands.

Answer :B::D
Discussion
7270.

Which of the following plots of radial - probability function 4pi^(2)psi^(2) is /are correct

Answer»

Only i
ii and III
I and iii
all

Answer :C
Discussion
7271.

Which will gives silver mirror test with Tollen's reagment ?

Answer»

`Me-C-=C-H`
`Ph-NH-OH`
`Me-OVERSET(O)overset(||)(C )-overset(OH)overset(|)UNDERSET(Me)underset(|)(C )-Me`
all of these

Solution :N//A
Discussion
7272.

Which one of the following is used for purification of drinking water?

Answer»

`SO_(3)`<BR>`SO_(2)`
`Br_(2)//H_(2)O`
`Cl_(2)`

Solution :`Cl_(2)`
Discussion
7273.

Two moles of liquid A(P_(A)^(0)=100 torr) and 3 moles of liquid B(P_(B)^(0)=150 torr) from a solution having vapour pressure of 120 torr. Based upon this observation one can conclude:

Answer»

INTERACTIONS between like MOLECULES `GT` those between unlike molecules
Interaction between like molecules `gt` those between unlike molecules
Interactions between like molecules =those between unlike molecules
`DeltaS_("MIXING")=0`

Answer :B
Discussion
7274.

What is the actual volume occupied by watr molecules present in20 cm^(3) of water?

Answer»

20 `cm^(3)`
`10 cm^(3)`
`40 cm^(3)`
`24.49 DM^(3)`

SOLUTION :It is a FACT.
Discussion
7275.

Which of the following compounds will give racemic mixture on nucleophilic substitution by OH^(-) ion ?(i) CH_(2)-underset(C_(2)H_(5))underset("|")("C ")H-BrCH_(3)-overset("Br ")overset("|")underset(C_(2)H_(5))underset("|")("C ")-CH_(3)(iii)CH_(2)-underset(C_(2)H_(5))underset("|")("C ")H-CH_(2)Br

Answer»

(i)
(i),(ii) and (iii)
(ii) and (iii)
(i) and (ii)

Solution :In `S_(N)1` REACTION, the recemisation TAKES place if a SUBSTRATE (alkylhalide) is CHIRAL.
Discussion
7276.

What is the molality ofethy alcohol ( mol. wt. = 46) in aqueous solution which freezes at - 10^(@) C?( K_(f) for water 1.86 K molality ^(-1) )

Answer»

3.504
4.567
5.376
6.315

Solution :`( DELTA T_(F))/( K_(f)) = m . Delta T_(f) =10 `
Discussion
7277.

Which among the following is the most reactive?

Answer»

`Cl_(2)`
`Br_(2)`
`I_(2)`
`IC L`

Solution :Because of weaker bond between dissimilar atoms, INTERHALOGEN COMPOUNDS `(IC l)` are more REACTIVE than HALOGENS.
Discussion
7278.

What is oxidation states of (a) Br in Br_(3)O_(8) (b) C in C_(3)O_(2) , (c) 8 in S_(4)O_(6)^(2-)

Answer»

SOLUTION :(a) structure of `Br_(3)O_(8)` is <BR> Oxidation numbers of BROMINE in `Br_(3)O_(8)` are +6, +4, +6
(b) Structure of `C_(3)O_(2)` is `O = overset((+2))(C) = overset((O))(C) = overset((+2))(C) = O`
Oxidation numbers of carbons in `C_(3)O_(2)` are +2, 0, +2
(c) Structure of `S_(4)O_(6)^(2-)` is
Oxidation numbers of sulphur in `S_(4)O_(6)^(2-)` are +5, 0, 0, +5.
Discussion
7279.

Which is not correct about the chemistry of 3d and 4f series elements ?

Answer»

3d elements show more OXIDATION states than 4f series.
The energy difference between 3d and 4s orbital is very little.
Europium (II) is more stable than certum (II).
The PARAMAGNETIC CHARACTER in 3d elements increases from scandium to copper.

Solution :Paramagnetic character increases from scandium to manganese and then DECREASES from manganese to copper.
Discussion
7280.

Which of the following common element(s) is/are present in the anode mud in elctrolytic refining of copper ?

Answer»

Selenium
Tellurium
Silver
Gold

Answer :A::B::C::D
Discussion
7281.

which of the following isnylon 66 ?

Answer»

`[OC(CH_2)_6CONH(CH_2)_4NH]_n`
`[OC(CH_2)_4CONH(CH_2)_6NH]_n`
`[OC(CH_2)_4CONH(CH_2)_4NH]_n`
`[OC(CH_2)_6CONH(CH_2)_6NH]_n`

ANSWER :B
Discussion
7282.

Which one of the metals does not form amalgam ?

Answer»

Fe
Cu
Ag
Zn

Answer :A
Discussion
7283.

Which of thefollowingalkanes is affectedby AlCl_(3) ?

Answer»

`CH_(4)`
`C_(2)H_(6)`
`C_(3)H_(8)`
`C_(4)H_(10)` (n- butane )

Answer :D
Discussion
7284.

When CH_(3)CH_(2)CH_(2)Cl_(2) is treated with NaNH_(2), the product formed is

Answer»

`CH_(3)-CH=CH_(2)`
`CH_(3)-C-=CH`

ANSWER :2
Discussion
7285.

What will be the product formed when phenol reacts with bromine water?

Answer»

O - BROMO PHENOL
P-bromo phenol
1,3,5 - TRI bromo phenol
2,4, 6 - tri bromo phenol

SOLUTION :2,4, 6 - tri bromo phenol
Discussion
7286.

Which one of the following relationship is correct?

Answer»

At. Mass`=6.4xx"Sp.HEAT"`
At.mass `XX"Sp.heat"=6.4`
At. Mass `xx 6.4="Sp.heat"`
AT. Mass `xx "Sp. Heat"xx6.4=1`

ANSWER :B
Discussion
7287.

Which foods are protected from oxidation using sulphur dioxide and sulphites ?

Answer»

SOLUTION :Wine and beer, sugar SYRUPS and cut, peeled or dried FRUITS and vegetables are protected from oxidation using SULPHUR dioxide and sulphites.
Discussion
7288.

What is Clemmensen reduction ? Explain it.

Answer»

Solution :Aldehyde and ketones when heated with ZINC amalgam and concentrated hydrochloric acid give HYDROCARBONS. This reaction is known as Clemmensen reduction.
` underset("ACETALDEHYDE")(CH_3 - undersetoverset(||)(O)(C ) - H + 4 [H]) underset(conc.HCl)OVERSET(Zn +Hg)(to) underset("ethane")(CH_3-CH_3 + H_2O)`
Discussion
7289.

Which halogen reacts partically with hydrogen ever at high temperature and in the presence of a catalyst

Answer»

`F_(2)`<BR>`Cl_(2)`
`Br_(2)`
`I_(2)`

ANSWER :D
Discussion
7290.

Which of the following is not used in Friedel-Craft's reaction

Answer»

PHENYL acetanilide
Bromobenzene
Benzene
Chlorobenzene

Solution :Friedel-Craft's reaction involves the introduction of an alkyl or ACYL GROUP into benzene RING in the presence of a catalyst. The presence of an electron withdrawing group in the ring HINDERS the reaction. Therefore phenyl acetanilide is not used
Discussion
7291.

Which does not give ammonia with water?

Answer»

`Mg_3N_2`
AIN
`CaCN_2`
`CA(CN)_2`

ANSWER :D
Discussion
7292.

Which of the following is a sink for CO

Answer»

MICRO ORGANISM PRESENT in the SOIL
Oceans
Plants
Haemoglobin

Solution :MICROORGANISM present in the soil
Discussion
7293.

When each of the following species are transferred to a flask having double volume of the earlier flask, in which of the following cases, equilibrium constant is affected ?I.N_(2)(g)+3H_(2)(g)hArr 2NH_(3)(g)II.2NO(g)hArr N_(2)(g)+O_(2)(g) III.C(s)+O_(2)(g)hArr CO_(2)(g)IV.PCl_(5)(g) hArr PCl_(3)(g)+Cl_(2)(g)

Answer»

I, III
II, III
I, IV
I, III, IV

Solution :When `Delta n_(G) NE 0`, the equilibrium constant is affected.
I and IV, `Delta n_(g) ne 0`.
Discussion
7294.

What are called the drugs which inhibit the growth of microorganisms?

Answer»

Microbiostatic 
Microbicidal
Tranquilizers
Non-narcotics 

SOLUTION :Microbiostatic
Discussion
7295.

Write the structure of the principal organic product formed in the reaction of 1-propanol with each of the followinng reagents. (i). Potassium dichromate (K_(2)Cr_(2)O_(7)) I aqueous sulfuric acid, heat (ii). Acetic acid CH_(3)overset(O)overset(||)(C)OH in the presence of dissolved hydrogen chloride. (iii). Cl in the presence of pyridine. (iv). C_(6)H_(5)overset(O)overset(||)(C)Ooverset(O)overset(||)(C)C_(6)H_(5) in the presence of pyridine (v). . in the presence of pyridine.

Answer»

SOLUTION :(i) `CH_(3)CH_(2)COOH`
(ii). `CH_(3)COOCH_(2)CH_(2)CH_(3)`
(iii). `MePhSO_(2)OCH_(2)CH_(2)CH_(3)`
(iv). `PhCOOH+PgCOOCH_(2)CH_(2)CH_(3)`
(v).
Discussion
7296.

Which of the following statements is (ar) true for the given reaction 4A+BhArr2C+2D?

Answer»

The RATE of disappearance of B is one fourth the rate of disappearance of A
The rate of appearance of C is half the rate of disappearance of B
The RATES of formation of C and D are equal
The rare of formation of D is half the rate of disappearance of A

Solution :`(r_(A))/4=(r_(B))/1=(r_(C))/2=(r_(D))/2`
Discussion
7297.

Which of the following molecules/species are aromatic in character?

Answer»




ANSWER :C, D
Discussion
7298.

Which of the following order of Bond strength is not correct ?

Answer»

Diamond `LT` GRAPHITE (C–C bond)
`SO_(2) gt SO_(3)^(-2) gt SO_(4)^(-2)` (S-O bond)
`CO_(3)^(-2) lt HCO_(2)^(-)` (C-O bond)
`O_(2)^(-) lt O_(2) lt O_(2)^(+)` (O-O bond)

Answer :B
Discussion
7299.

Which of the following element is metalloid

Answer»

Bi
SN
GE
C

Solution :Boron (B), Si ,Ge,As,SB and At are the METALLOID elements. Bismuth (Bi) and tin (sn) are metals while carbon (C) is non-metal.
Discussion
7300.

Which of the following salts release reddish brown gas when heated in a dry test tube ?

Answer»

`LiNO_(3)`
`KNO_(3)`
`PB(NO_(3))_(2)`
`AgNO_(3)`

ANSWER :A::C::D
Discussion