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20351.

Which will show maximum non-metallic character

Answer»

B
Be
Mg
Al

Answer :A
Discussion
20352.

VCl_(3)(THF)_(3)overset(Mg,ZnI_(2))underset(CO,Delta,pressure) to Na[V(CO)_(6)]overset(H^(+)) to [V(CO)_(6)] Select the correct statement about [V(CO)_(6)]

Answer»

It acts as reducing AGENT
It acts as oxidising agent
E.A.N value of V is 35
E.A.N value of V is 36

Solution :`[V(CO)_(6)] imples"EAN"=23+12=35`
Discussion
20353.

The unit of van der Waals' constant 'a' is :

Answer»

atm `litre^2 mol^(-2)`
DYNE `cm^4 mol^(-2)`
NEWTON `m^4mol^(-2)`
All of the above

Answer :D
Discussion
20354.

Write the IUPAC name of the following :

Answer»


ANSWER :N, N-Dimethylaniliniumethanoate.
Discussion
20355.

Which of the following solids is not an electrical conductor? (A) Mg (s) (B) TiO (8) (C) I_2(s) (D) H_2O(s)

Answer»

(A) only
(B) only
(C) and (D)
(B), (C) and (D)

SOLUTION :Ice and iodine are molecular SOLIDS. Hence, they do not CONDUCT electricity.
Discussion
20356.

Which colour is given by secondary alcohol in Victor Meyer's test?

Answer»

RED
GREEN
BLUE
YELLOW

SOLUTION :Blue
Discussion
20357.

What do you understand by the term chemotherapy ?

Answer»

Solution :The branch of chemistry which DEALS with the treatment of diseases using CHEMICALS is CALLED CHEMOTHERAPY
Discussion
20358.

The solubility of a solid in a liquid depends on :

Answer»

NATURE of solute
Nature of solvent
Temperature
All

Answer :D
Discussion
20359.

When SO_2 is passed through acidified solution of H_2S

Answer»

`H_2SO_3` is FORMED
`H_2SO_4` is formed
SULPHUR is PRECIPITATED
`H_2SO_5` is formed

ANSWER :C
Discussion
20360.

The specific resistance of 0:1 M solution of an electrolyte is 100 ohm. Calculate its molar conductance.

Answer»

Solution :Specific CONDUCTANCE (K)
`=(1)/("Specific resistance")=0.01ohm^(-1)cm^(-1)`
MOLAR conductance, `A_(m)`
`=(kxx1000)/(C)=(0.01xx1000)/(0.1)=100ohm^(-1)cm^(-2)mol^(-1)`
Discussion
20361.

Which of the following combination is correct for the stability of the intermediatewhich have back bonding.

Answer»

(II)(ii)(P)
(III)(iii)(Q)
(III)(ii)(Q)
(II)(iv)(P)

Solution :
has BACK BONDING HENCE resonance is ALSO possible due to `ppi-dpi` delocalization.
Discussion
20362.

Which will not respond to carbylamine reaction?

Answer»

ETHYLAMINE
`(CH_3)_2NH`
`CH_3NH_2`
Phenylamine

Answer :B
Discussion
20363.

Which reaction is suitable for the preparation of alpha-chloroacetic acid?

Answer»

HELL - Volhard ZELINSKY REACTION
Nef reaction
Stephen reaction
Perkin condensation

Solution :Hell-Volhard Zelinsky reaction
Discussion
20364.

Which alcohols contain the -OH group attached to a sp^(3)- hybridised carbon atom next to an aromatic ring?

Answer»

SOLUTION :BENZYLIC
Discussion
20365.

Which of the following structures is enantiomeric with the molecule (A) given below :

Answer»




Solution :The CONFIGURATION is inversed w.r.t. - Br and `-C_(2)H_(5)`
Discussion
20366.

Write the IUPAC name of the given compound : HO-CH_(2)-CH=underset(CH_(3))underset("|")"C "-CH_(3)

Answer»

Solution :`UNDERSET("3-Methylbut-2-en-1-ol")(HO-overset(1)CH_(2)-overset(2)CH=overset("3")underset(CH_(3))underset("|")"C "-overset(4)CH_(3)`
Discussion
20367.

Which of the following set gives the product that give two monochloro structural products after reaction with Cl//hv ?

Answer»

<P>(III)(II)(R)
(II)(iv)(P)
(IV)(i)(S)
(IV)(i)(P)

SOLUTION :
Discussion
20368.

Who coined the term catalysis and Nobel Prize ?

Answer»

Berzelius
Kolbe
Wholer
Rutherford

Answer :A
Discussion
20369.

Which of the following oxides of nitrogen is colourless solid ?

Answer»

`NO`
`N_(2)O`
`N_(2)O_(4)`
`N_(2)O_(5)`.

ANSWER :D
Discussion
20370.

Which observation (s) reflect(s) colligative properties ? (i) A 0.5m NaBr solution has a higher vapour pressure than a 0.5 m BaCl_2 solution at the same temperature. (ii) Pure water freezes at the higher temperature than pure methanol. (iii) A 0.1 m NaOH solution freezes at a lower temperature than pure water. Choose the correct answer from the codes given below

Answer»

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

Solution :COLLIGATIVE properties DEPENDS upon the no. of PARTICLES. Since methanol is non electrolyte hence CONNOT be considered.
Discussion
20371.

Which method of purification is represented by the following equation ? Ti_((s)) + 2I_(2(g)) overset(525K)(rarr) Til_((g)) overset(1700K)(rarr) Ti_((s)) + 2I_(2(g))

Answer»

Cupellation 
Poling 
VAN Arkel 
Zone refining 

Solution :Van Arkel Van Arkel METHOD which is also called as VAPOUR phase refining is used for reparing ultrapure metals LIKE titanium, ZIRCONIUM, thorium and vranium.
Discussion
20372.

Which of the following statements given about emulsions is incorrect ?

Answer»

The droplets in emulsions are often negatively charged and can be precipitated by electrolytes .
Emulsion can be diluted with any amount of the dispersed LIQUID. On the other hand, the dispersion medium when mixed, forms a separate LAYER.
Emulsions can be broken into constituent liquids by heating , FREEZING , CENTRIFUGING ,etc.
Emulsions also SHOW Browian movement and Tyndall effect.

Solution :Emulsions can be diluted with any amount of the dispersion medium. On the other hand, the dispersed liquid when mixed, forms a separate layer.
Discussion
20373.

Xylene on treatment with Br_(2)/FeBr_(3) give only one product. The xylene used was

Answer»

o- Xylene
p- Xylene
m- Xylene
Cannot be determined

Answer :B
Discussion
20374.

Write the zwitterion structure of glycine.

Answer»

Solution :A zwitterion is a DIPOLAR ion formed by neutralization of acidic and basic centres present within the MOLECULE. For EXAMPLE , all amino acids and SULPHURIC acid exist as zwitterions.
Discussion
20375.

Which one of the elements is a d-block element?

Answer»

As
Pt
Pb
Ra

Answer :B
Discussion
20376.

Which of the following is not o,p - directing group ?

Answer»

`-NH_2`
`-OH`
`-X` (halogens)
`-CHO`

Solution :
Presence of -CHO DECREASE electron density at o and p positions. HENCE , attack of an electrophile occurs at position therefore it is meta directing group
Discussion
20377.

Which of the following sets of quantum numbers is permissible for an electron in an atom?

Answer»

`n=1, l=1, m=0, s= + (1)/(2)`
`m=3, l=1, m= -2, s= - (1)/(2)`
`n=2, l=1, m=0, s= + (1)/(2)`
`n=2, l=0, m= 0, s=1`

ANSWER :C
Discussion
20378.

The unit cell with crystallographic dimensions a=b ne c, alpha=beta=gamma=90^(@) is

Answer»

Cubic
Tetragonal
Monoclinic
Hexagonal

Answer :B
Discussion
20379.

Which of the following arrangements doesnot represent the correct order of the property stated against it?

Answer»

`Sc LT TI lt Cr lt Mn`: Number of oxidation STATES
`V^(2+) lt Cr^(2+) lt Mn^(2+) lt Fe^(2+)`: Paramagnetic BEHAVIOUR
`Ni^(2+) lt Co^(2+) lt Fe^(2+) lt Mn^(2+)`: IONIC size
`Co^(3+) lt Fe^(3+) lt Cr^(3+) lt Sc^(3+)`: Stability in aqueous solution

Answer :B
Discussion
20380.

Which of the following hormones contains iodine :

Answer»

ADRENALIN
Testosterone
Thyroxine
Insulin

Answer :C
Discussion
20381.

The yellow colour of ZnO and conducting nature produced in heating is due to :

Answer»

META EXCESS defects due to INTERSTITIAL cation
Extra positive IONS present in an interstitial site
Trapped electrons
All

Answer :D
Discussion
20382.

Which one of the following reagents reacts with both acetaldehyde and acetone?

Answer»

FEHLING's solution
Grignard reagent
Schiff's reagent
Tollen's reagent

Answer :B
Discussion
20383.

When n-propyl methyl ether is treated with cold HI:

Answer»

Methyl IODIDE and n-propyl ALCOHOL are formed
n- propyliodide and methyl alcohol are formed
`CH_3I and CH_3CH_2CH_2I` are formed
None of these

Answer :A
Discussion
20384.

The suitable thermodynamic conditions for a spontaneous reaction at all temperature are

Answer»

`DELTAHGT0, DeltaSlt0`
`DELTAHLT0, DeltaSgt0`
`DeltaHgt0, DeltaSgt0`
`DeltaHlt0, DeltaSlt0`

ANSWER :D
Discussion
20385.

Which of the following compound is/are predominantly ionic?

Answer»

`KCL`
`Na_2S`
`H_2`
CaO

Answer :A::B::D
Discussion
20386.

Which plots will give the value of activation energy ?

Answer»

K VS T
1/K vs T
In K vs. T
` In K vs 1/T`

ANSWER :D
Discussion
20387.

The van.t Hoff factor of NaCl assuming 100% dissociation is :

Answer»

1/2
2
1
3

Answer :B
Discussion
20388.

Which statements (s) is/are true about osmoitc pressure(pi) volume (V) and temperature (T) ?

Answer»

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

Solution :(a,b,d) `: pi prop C` (at constant T)
i.e `(pi)/(C)` = constant (at constant T)
Again `C= (N)/(V) i.e C prop (1)/(V)` (at constant T)
i.e `pi prop (1)/(V)` (at constant T)
Discussion
20389.

Which of the following oxidation state is common for lanthanides?

Answer»

`+2`
`+3`
`+4`
`+5`

ANSWER :C
Discussion
20390.

Which of the following statements is/are TRUE? (i) Titanium on reacting with I_(2) forms Til_(2) . (ii) Aquated complex of Ti^(3+) is violet coloured (iii) Titanium is the most reducing metal among 3d-series metals. (iv) Titanium is passive to dilute non-oxidising acids at room temperature.

Answer»

i,ii,III,iv
ii,iii,iv
i,ii,iii
ii,iii

Answer :B
Discussion
20391.

Which of the followinf is/are correct?

Answer»

It is unimolecularnucleophilic SUBSTITUTION reaction `S_(N)1` if or `II` is FORMED.
It is bimolecular nucleophilic substitution reaction `S_(N)2` is `I` or `II` is formed.
It is `S_(N) 1` if `I` and is enantomer are formed so that the MIXTURE is racemic.
It is `S_(N)2` if `II` is formed.

Answer :C::D
Discussion
20392.

Which acid of each pair shown here would you expect to be stronger ?CH_(3)CO_(2)H or CH_(2)FCO_(2)H

Answer»

SOLUTION :`FCH_(2)COOH`
Discussion
20393.

What is lanthanoid contraction ?

Answer»

Solution :Regular decrease in atomic radius with increase in atomic number in f-block ELEMENTS is called LANTHANOID contraction.
Discussion
20394.

Which of the following combination of reagents can bring the given transformation ?

Answer»

MG/ether, `PhCHO.//Delta, (CH_(2)OH)_(2)//H^(+),H_(3)O^(+)`
`(CH_(2)OH)_(2).//H^(+),PhCHO.//Delta,H_(3)O^(+)`
`alc. KOH,PhCHO.//Delta, Mg//"ether",H_(3)O^(+)`
`(CH_(2)OH)_(2)//H^(+),Mg//"ether",PhCHO.//Detla, H_(3)^(+)O`

Answer :D
Discussion
20395.

Which has the maximum acidic strength ?

Answer»

0-Nitrobenzoic acid
m-Nitrobenzoic acid
p-Nitrobenzoic acid
p- Nitrophenol

Answer :A
Discussion
20396.

WhenCaC_2 was hydrolysed , a gas was obtained. It had a garlic odour due to phosegene present as impurity. The gas was passed through ammoniacal .solution of Cu_2Cl_2 , red precipitate was obtained .The gas was :

Answer»

Ethylene
Propyne
Acetylene
Ethane

Answer :C
Discussion
20397.

Which one of the following statement is false?

Answer»

Raoult’s law states that the vapour PRESSURE of a component over a SOLUTION is PROPORTIONAL to its mole fraction
The osmotic pressure `(pi)` of a solution is given by the equation `pi` = MRT where M is the molarity of the solution
The correct ORDER of osmotic pressure for 0.01 M aqueous solution of each compound is `BaCl_2 gt KCL gtCH_3COOH gt` sucrose.
Two sucrose solutions of same molality prepared in different solvents will have the same freezing point depression.

Answer :D
Discussion
20398.

What is the entropy change of an engine that operates at 100^@C when 453.6 k.cal of heat is supplied to it?

Answer»

SOLUTION :`DELTAS = 1216.1 CALS K^(-1)`
Discussion
20399.

Which of the following solutions will have the highest boiling point

Answer»

`0.1M Al_(2)(SO_(4))_(3)`
`0.1M FeCl_(3)`
0.1 M NaCl
0.1 M UREA

Solution :Boiling point depends on number of solute particles hence HIGHEST in `0.1 M Al_(2)(SO_(4))_(3)`
Discussion
20400.

The standard enthalpies of formation of HCl(g), H(g) and Cl(g) are -92.2, 217.7 and 121.4 kJ mol^(-1) respectively. The bond dissociation enthalpy of HCl is :

Answer»

`+431.3 kJ`
236.9 kJ
`-431.3 kJ`
339.1 kJ

Solution :`HCL(g) LT H(g) + CL(g)`
`DELTA H = [Delta_(f)H(H(g)) + Delta_(f)H Cl(g)] - Delta_(f)H (HCl(g))`
`= 217.7 + 121.4 - (- 92.2) = 431.3 kJ`
Discussion