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6501.

Which of the following equations is not correct?

Answer»

`DELTA G^@ = - nFE^@`
`Delta G^@ =-RT LN K`
`E^@ = (RT)/(nF) log K`
`Delta G = Delta G^@ + RT ln Q`

Solution :`E_(cell)^@ = (2.303)/(nF)` RT log K, is the correct equation.
Discussion
6502.

Which one doesn't liberate NH_(3) when undergoes hydrolysis

Answer»

ACETANILIDE
Acetonitrile
Acetamide
Phenyl ISOCYANIDE

Solution :ISOCYANIDES on hydrolysis forms PRIMARY amines not AMMONIA.
Discussion
6503.

Which of the follwingwill notundergoestautomerisation ?

Answer»

`(CH_(3))_(3) C- NO_(2)`
`CH_(3) - CH_(2) - NO_(2)`
`CH_(3) - NO_(2)`
`CH_(3) - CH_(2) - CH_(2) - NO_(2)`

SOLUTION :Compoundcontaining`alpha -H`atomsundergotautomerisation .
Discussion
6504.

Which one of the following colloid has spherical shape?

Answer»

`AS_2S_3`
`FE(OH)_3`
`W_3O_5`
DUST

SOLUTION :`AS_2S_3`
Discussion
6505.

Which among the following is the strongest conjugate acid?

Answer»




`CH_(3)OVERSET(+)(N)H_(3)`

Solution :A weak BASE has a strong CONJUGATE acid. SINCE aniline is the weakest base, therefore, its conjugate acid is the strongest acid.
Discussion
6506.

The sun of the number of lone pairs of electrons on each centrel atom in the following species is [TeBr_(6)]^(2-), [BrF_2]^(+), SNF_(3) and [XeF_(3)]^(-) (atomic numbers : N=7,F=9,S=16,Br=35,Te=52,Xe=54)

Answer»


Solution :`{:("Species",,"lone pair on central atom"),(TeBr^(2-),:,1),(BrF_(2)^(+),:,2),(SNF_(3),:,0),(XeF_(3)^(-),:,3):}`
Total no. of lone pair =6
`SNF_(3)`:`{:("N"),("|||"),("S"),("/|\"),("FFF "):}`
Discussion
6507.

Which of the following has smaller size

Answer»

H
`He^(+)`
`._(1)H^(2)`
`LI^(2+)`

ANSWER :D
Discussion
6508.

Which one of the following sets of monosaccharides

Answer»

`alpha`-D-Glucopyranose and `BETA`-D-Fructofuranose
`beta`-D-Glucopyranose and `beta`-D-fructofuranose
`beta`-D-Glucopyranose and `beta`-D-fructofurancose
`alpha` -D-Glucopyranose and `alpha`-D-fructofuranose

Solution :SUCROSE is composed of `alpha`-D-glucopyranose and `beta`-D-fructosefuranose UNITS which are joined by `alpha, beta`-glycosidic LINKAGE between C-1 of the glucose unit and C-2 of the fructose unit.
Discussion
6509.

The solution of (B) in conc. HCl on treatment with potassium ferrocyanide gives a blue colour or precipitate of compound (D).

Answer»


Answer : The ors is chromite `FeOCr_(2)O_(3)`.
`underset((B))(Fe_(2)O_(3))+6HCl rarr 2FeCl_(3)+3H_(2)O`
`4FeCl_(3)+4K_(4)Fe(CN)_(6)underset("(D) PRUSSIAN blue")(rarr) Fe[Fe(CN)_(6)]_(3)+12 KCl`
Discussion
6510.

Which type of alcohol is obtained on reduction of aldehyde?

Answer»

`1^(@)`
`2^(@)`
`3^(@)`
All of these

Solution :`1^(@)`
Discussion
6511.

Which is incorrect statement with respect to physical adsorption ?

Answer»

It is reversible process.
Value of adsorption enthalpy is low.
There is UNIMOLECULAR LAYER on the SURFACE of adsorbent.
It OCCURS at low temperature.

Solution :There is unimolecular layer on the surface of adsorbent
Discussion
6512.

Which of the following statements is wrong ?According to Fazan's rules, the covalent character is facoured by :

Answer»

SMALL SIZE of CATION
the cation having 18 electrons SHELL
small size of anion
high charge of cation and anion

Answer :C
Discussion
6513.

Which of the following acts as a negative catalyst?

Answer»

Lead TETRAETHYL as an antiknock compound
Glycerol in decomposition of `H_(2)O_(2)`
Ethanol in the OXIDATION of chloroform
All the above

Answer :D
Discussion
6514.

The vapour pressure of heptane and toluene at 50^@Care 141 mm and 93 mm respectively. Find the composition of the solution (containing toluene and heptane) at which the partial pressure of toluene is equal to that of heptane.

Answer»

SOLUTION :0.602, 0.398
Discussion
6515.

Which ofthe following graphis correctfor a zero orderreaction ?

Answer»




Solution :For a zero order reaction `""[R]=underset(uparrow)((-k))underset(uparrow)(t)+underset(uparrow)([R]_(0))`
`""y=mxxx+c`
On COMPARING with Eq. of STRAIGHT line
`""y=[R]` concentration
`""x=t` TIME

`"""Slope"(m)=-k` rate constant
`"""Intercept"(c)=[R]_(0)` initial concentration
On rearranging Eq. (i)
`""([R]-[R]_(0))/(t)=-k`
`""([R]-[R]_(0))/(t)=-kt^(0)`
`"""Rate"propt^(0)`
Discussion
6516.

Write the names of reagents ad equations for the preparation of the following ethers by williamson synthesis: (i) 1-Propoxypropane (ii) Ethoxybenzene (iii) 2-Methyl-2-methoxypropane (iv) 1-Methoxyethane

Answer»

SOLUTION :
Discussion
6517.

Which of the following pairs does not exhibit colour in solution ?

Answer»

`ZnCl_2, HgCl_2`
`CuCl_2, VOCl_2`
`VOCl_2, FeCl_2`
`MnCl_2, FeCl_3`

ANSWER :A
Discussion
6518.

What is the order of radioactive decay ?

Answer»

first ORDER
ZERO order
second order
Third order

ANSWER :A
Discussion
6519.

Which one is most reactive towards S_(N)1 reaction?

Answer»

`C_(6)H_(5)CH_(2)Br`
`C_(6)H_(5)CH(C_(6)H_(5))Br`
`C_(6)H_(5)CH(CH_(3))Br`
`C_(6)H_(5)C(CH_(3))(C_(6)H_(5))Br`

Solution :Reactivity in `S_(N)1` reactions depends UPON the STABILITY of the carbocation intermediate. Since the stability of the CARBOCATIONS increases in the order:

Therefore, the alkyl HALIDE, `C_(6)H_(5)C(CH_(3))(C_(6)H_(5))Br,` i.e., (d) is the most reactive.
Discussion
6520.

Which of the following is antidipressent ?

Answer»

VALIUM
BORIC ACID
SODIUM bisulphine

Answer :A
Discussion
6521.

Which of the following are square planar complexes ? (P) [AuCl_(4)]^(-)""(Q) [Pt(Cl)_(4)]^(2-) (R ) [Mn(Br)_(4)]^(2-)""(S) [Cu(NH_(3))_(4)]^(2+) select the correct answer using the codes given below :

Answer»

<P>P and Q only
Q and R only
Q and S only
P, Q and S only

Answer :D
Discussion
6522.

What is the colour change take place when Fehling's solution is added to an aldehyde?

Answer»

RED to BLUE
Blue to red
Red to green
Green to blue

SOLUTION :Blue to red
Discussion
6523.

Van-Arkel method of refining Zirconium involves,

Answer»

REMOVING all oxygen and NITROGEN IMPURITIES
removing CO IMPURITY
removing hydrogen impurity
removing SILICA impurity l

Answer :a
Discussion
6524.

Three separate samples of a solution of a single salt gave these test results: one formed a white precipitate with excess ammonia solution, one formed a white precipitate with dil. NaCl solution and one formed a black precipitate with H_(2)S the salt salt could be

Answer»

`AgNO_(3)` SOLUTION
`Pg(NO_(3))_(2)`
`HG(NO_(3))_(2)`
`MnSO_(4)`

Solution :`Pb(NO_(3))_(2)+2NH_(4)OH to UNDERSET("White ppt.")(Pb(OH)_(2))+2NH_(4)NO_(3)`
`Pb(NO_(3))_(2)+2NaCl to underset("White ppt.")(PbCl_(2))+2NaNO_(3)`
`Pb(NO_(3))_(2)+H_(2)S to underset("BLACK ppt.")(PbS)+2HNO_(3)`
Discussion
6525.

What is danatured alcohol?

Answer»

SOLUTION :Alcohol made UNFIT for drinking puposes by ADDING poisonous substances like `CuSO_(4)`, PYRIDINE, etc. is CALLED denatured alcohol.
Discussion
6526.

Which of the following fibres is made up of polyamides?

Answer»

DACRON
ORLON
NYLON
Rayon

Solution :Nylon is a POLYAMIDE
Discussion
6527.

Uranium ._(92)U^(235) on bombardment with slow neutrons produces

Answer»

Deutrons
Fusion reaction
Fission reaction
Endothermic reaction

Solution :`._(92)U^(235) + ._(0)n^(1) RARR ._(56)Ba^(145) + ._(36)KR^(88) + 3 ._(0)^(1)n`
Discussion
6528.

When diphenyl acetylene is treated with dilutesulphuric acid in presence of mercuric sulphate at 60-70^@C, which product is formed ? Give equation .

Answer»

Solution :BENZYL PHENYL KETONE is formed in the above reaction .
`C_6H_5-C-=C_6H_5+H_2Orarr[C_6H_5-CHoverset(HO)overset(|)C-C_6H_5] HARR C_6H_5-CH_2-C-C_6H_5`
Discussion
6529.

What is the structure and IUPAC name of the compound, allyl amine ?

Answer»


ANSWER :`CH_(2)=CH-CH_(2)NH_(2)` Prop-2-en-1-amine.
Discussion
6530.

Which of the following is a synthetic detergent-

Answer»

`C_15H_31COOK`
`CH_3(CH_2)_6COO^(-)NA^+`

NONE of these

Answer :C
Discussion
6531.

Which of the following drug isused in hyper tension and depression ?

Answer»

SALOL
Serotonin
Boric acidBHT

Answer :B
Discussion
6532.

The value of Henry's law constant for some gases at 293 K is given below. Arrange the gases in the increasing order of their solubility. He : 144.97 kbar, H_(2) : 69.16 kbar, N_(2) : 76.48 kbar, O_(2) : 34.86 kbar

Answer»

`He lt N_(2) lt H_(2) lt O_(2)`
`O_(2) lt H_(2_ lt N_(2) lt He`
`H_(2) lt N_(2_ lt O_(2) lt He`
`He lt O_(2) lt N_(2) lt H_(2)`

SOLUTION :`"SOLUBILITY" PROP 1/(K_H)`.
Discussion
6533.

Write short note : Nylon-6,6

Answer»

Solution :Preparation : It is prepared by the condensation polymerization of hexamethylene-diamine with adipic acid under high pressure and at high temperature.
`nHOOC(CH_(2))_(4)COOH+nH_(2)N(CH_(2))_(6)NH_(2)overset("553 K")UNDERSET("High pressure")rarrunderset("NYLON 6,6")([--N-(CH_(2))_(6)-overset(H)overset(|)N-overset(O)overset(||)C(CH_(2))_(4)-overset(O)overset(||)C--]_(n))+nH_(2)O`
PROPERTIES : Nylon 6, 6 is fibre forming solid.
It possess high tensile strength.
These high tensile strength can be attributed to the strong intermolecular forces like hydrogen bonding.
These strong forces also LEAD to close packing of chains and thus impart crystalline nature.
Uses : Nylon 6, 6 is used in making sheets, bristles for brushes and in textile undustry.
Discussion
6534.

A crystalline solid

Answer»

Isotropic
Sharp MELTING point
Definite GEOMETRY
HIGH intarmolecular forces

Answer :A
Discussion
6535.

Which of the following is used to replace halogen atom from chlorobenzene by CN?

Answer»

HCN
AgCN
CuCN
`CH_(3)-CN`

ANSWER :C
Discussion
6536.

Write down the structures ofthe following (i) 2 - methyl - butanoyl chloride (ii) 5 - chloro - 3 - ethylpentan - 2 - one (iii) Diethyl butane - 1,4 dioate (iv) Methyl - 2 - methylprop - 2 - en - 1 - oate (v) 3 - phenylprop - 2 - enoic acid (vi) Propane - 1,2,3 - tricarboxamide.

Answer»

Solution :(i) `OVERSET(1)(C)H_(3)overset(3)(C)H_(2)overset(2)(C)H(CH_(3))overset(1)(C)OCI`
(ii) `overset(1)(C)H_(3)overset(2)(C)O-overset(3)underset(CH_(2)CH_(3))underset(|)(C)Hoverset(4)(C)H_(2)-overset(5)(C)H_(2)CI`
(iii) `C_(2)H_(5)Ooverset(4)(C)Ooverset(3)(C)H_(2)overset(2)(C)H_(2)overset(1)(C)OOC_(2)H_(5)`
(iv)`overset(3)(C)H_(2)=overset(2)underset(CH_(3))underset(|)(C)-overset(1)(C)OOCH_(3)`
(v) `C_(6)H_(5)overset(3)(C)H=overset(2)(C)H-overset(1)(C)OOH`
(vi)
Discussion
6537.

What are the chief pollutants of the atmosphere which are most likely to deplete the ozone layer

Answer»

CARBON dioxide
Nitrogen OXIDE and fluorocarbons
Sulphur dioxide
Carbon monoxide

Answer :B
Discussion
6538.

underset((X))(C_(4)H_(11))N+HNO_(2)rarrC_(4)H_(10)O(3^(@) "alcohol") (X) will give:

Answer»

CARBYLAMINE reaction
Hofmann MUSTARD oil reaction
diazonium salt with `HNO_(2)`
base INSOLUBLE PRODUCT with Hinsberg reagents

Answer :A::B::C
Discussion
6539.

Which of the following sulphides is white?

Answer»

CdS
PBS
ZNS
SnS

Solution :ZnS is WHITE COLOUR SULPHIDE
Discussion
6540.

The root mean square speed at NTP for the gases CH_4,H_2,He and F_2 are in the order

Answer»

`CH_4ltH_2ltHeltF_2`
`H_2ltHeltCH_4ltF_2`
`H_2ltHeltF_2ltCH_4`
`F_2ltCH_4ltHeltH_2`

ANSWER :C
Discussion
6541.

Which of the following expression gives the de Broglie relationship ?

Answer»

`p=h/(mv)`
`lamda=h/(mv)`
`lamda=h/(mp)`
`lamdam=v/p`

SOLUTION :DE Broglie proposed that an electron, like light, behaves both as a material particle and as a wave. This proposal gave birth to a new theory KNOWN as wave MECHANICAL theory of matter. de Broglie equation is GIVEN by `lamda = h//mv = h//p`.
Discussion
6542.

The standard oxidation ptoetial of zinic is 0.76 V and of silveris -0.80 V calculatethe emf of thecell Zn|Zn(NO_(3))_(2)(0.25 M)||AgNO_(3)(0.1)M|Ag "at" 25^(@) C

Answer»

1.158 V
1.352 V
0.768 V
21.32 V

Solution :Thecell REACTIONIS `Zn+ 2Ag^(+) RARR 2 Ag+ Zn^(2+)`
`E_("cell")^(@)=E_("oxi")^(@)` of `Zn + e_("red")^(@)` of`Ag=0.76 +0.80 =1.56 V`
We KNOW that
`E_("cell") =E_("cell")^(@)-(0.0591)/(n) log[("products")]/[("reactants")] =E_("cell")^(@) -(0.0591)/(2) log(0.25)/(0.1xx0.1)`
`=1.56 -(0.0591)/(2) xx (1.0591)/(2)xx1.3979 =1.3979 =(1.56 -0 0.0413) V, E_("cell")=1.5187 V`
Discussion
6543.

Which is /are used to identify by phenol in laboratory ?

Answer»

`FeCl_(3)`<BR>`NaNO_(2)` + HCL
`Br_(2)H_(2)O`
Ceric ammonium nitrate

Solution :N//A
Discussion
6544.

What is metallic bond?

Answer»

Solution :It is the force of attraction between the positively charged METAL ions or kernels and delocalised (or MOBILE) valence ELECTRONS in a metal.
Discussion
6545.

Which pair is not isomorphous pair :-

Answer»

GREEN vitriol, Epsum salt
`KNO_(3), CaCO_(3)`
`NAF, Na_(2)O`
Potash alum, chrome alum

Answer :C
Discussion
6546.

The total number of tetrahedral voids in the face-centred unit cell is-

Answer»

6
8
10
12

Answer :B
Discussion
6547.

What is Acid rain ? What are its harmful effects ?

Answer»

Solution :When the rain falls through polluted air, it comes across chemicals such as gaseous oxides of sulphur `(SO_(x))`, oxides of nitrogen (`NO_(x)`) , mist of hydrochloric acids & phosphoric acid etc. These SUBSTANCES dissolve in falling rain making it more ACIDIC than normal with pH ranging between (5.6 - 3.5).
Harmful effect of acid rain
(i) Most of aquatic animals can not survive when pH is less than 4. Certain fishes die even when the pH is less than 5.5.
(ii) Acidic water is dangerous for plants leaf pigments are decolourised , acid affects green pigments of plants. Agricultural productivity is also DECREASED.
(iii) Metallic surfaces exposed to acid rain are readily corroded. Textile fabrics, PAPER, & leather products lose their material strength or disintexamplerate by the acid rain.
Discussion
6548.

Which RNA is hydrolysed, there is no relationship among quantities of different bases obtained. What does this fact suggest about structures of RNA ?

Answer»

SOLUTION :RNA is SINGLE STRANDED.
Discussion
6549.

Which of the following statement is not correct

Answer»

Atomic no. of A, B, C are 40,57, 105 resp.
Group no of A, B, C are IV B, III B and V B respectively
Period no of A, B, C are, `4^(th), 5^(th) and 6^(th)` resp.
C is a radioactive element

Solution :
A = 40, B = 57, C = 105
Discussion
6550.

What is the oxidation number of the central metal in [Cr(NH_(3))_(4)(NO_(2))Cl]^(+) ? (Atomic No. of Cr = 24)

Answer»

0
`+1`
`+3`
`+2`

ANSWER :A
Discussion