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7451.

Which one of the following metals cannot evolve H_(2) from acids or H_(2)O or from its compound

Answer»

HG
Al
Pb
Fe

Solution :Hg has greater REDUCTION potential than that of `H^(+)` and hence cannot displace HYDROGEN from ACID.
Discussion
7452.

Which one is use as alkali in bath soap ?

Answer»

`NAOH`
`KOH`
`Cu(OH)_(2)`
`NH_(3)`

Solution :`KOH`
Discussion
7453.

What are stereoisomers?

Answer»

Solution :(i) The stereoisemers of a coordination compounds have the same chemical formula and connectivity between the CENTRAL metal ATOM and the ligands .
(ii) But they differ in the spatial ARRANGEMENT of ligands in three dimensional SPACE .They can be further CLASSIFIED as geometrical isomers and optical isomers .
Discussion
7454.

Which of the following is correct regarding compounds [A] and [B] ?

Answer»

[A] and [B] are SUPER imposable mirror images
The CONFIGURATION of [A] is 'R' and [B] is 'S'
[A] and [B] are diastereomers
[A] is formed with inversion of configuration & [B] with RETENTION of configuration

Answer :D
Discussion
7455.

What are emulsions ? What are their different types ? Give one example of each type.

Answer»

Solution :These are liquid-liquid colloidal systems. If a mixture of two immiscible or partly miscible LIQUIDS is shaken, a dispersion of one liquid in the other is obtained which is called emulsion. There are two types of emulsions :
OIL in water : In such emulsions, water is the dispersion medium. EXAMPLES - Milk and vanishing creams are examples of this type of emulsions.
Water in oil : In such emulsions, oil ACTS as the dispersion medium. Examples - Butter and CREAM are examples of this type of emulsions.
Discussion
7456.

Two reactions of the same order have equal preexponential factors but their activation energies differ by 24.9 kJ mol^(-1).The ratio of their rate constants at 27^@C (R = 8.3JK^(-1) mol^(-1)) is :

Answer»

`3.246`
`2.20 XX 10^(14)`
`2.20 xx 10^(4)`
`1.86 xx 10^(4)`

ANSWER :C
Discussion
7457.

What is inorganic benzene?

Answer»

Solution : `B_(3)N_(3)H_(6)`
Discussion
7458.

Which of the following dyes does not possess antiseptic properties?

Answer»

Acriflavine
Gentian violet
METHYLENE blue
Phenolphthalein

Solution :Only phenolphthalein does not POSSESS ANTISEPTIC properties.
Discussion
7459.

Which is an amphoteric oxide?

Answer»

MgO
BaO
`Al_2O_3`
`P_2O_5`

ANSWER :C
Discussion
7460.

Which one of the following compound exhibits both Schottky and Frenkel defects ?

Answer»

NaCl
AgCl
AGBR
Agl

Solution :AgBr SHOWS both Schottkyanf FRENKEL DEFECTS
Discussion
7461.

Zinc spelter contains _________ of zinc.

Answer»

`95%` to `99%`
97% to 98%
99% to 100%
90% to 95%

ANSWER :B
Discussion
7462.

Which reaction is/are Correct.

Answer»




SOLUTION :B and D are CORRECT REACTIONS.
Discussion
7463.

Vapour pressure of a solution of heptane and octane is given by the equation : P_("sol")(m m Hg) = 32 + 63x where x is the mole fraction of heptane. Vapour pressure of pure heptane will be

Answer»

<P>32mm HG
95 MM Hg
47.5 mm Hg
63 mm Hg

Solution :For PURE HEPTANE, `x=1`
P(heptane)`=32+63+1=95` mm Hg
Discussion
7464.

Which of the following intermediate have the complete octet around carbon ?

Answer»

Carbanion
Carbocation
Carbene
Free radical

Answer :A
Discussion
7465.

Which of the following is not a chromophore?

Answer»

`-N=N-`
`-NO`
`-NO_2`
`-NH_2`

ANSWER :D
Discussion
7466.

Which of the following can be used as plasticizers ?

Answer»

Cresyl PHTHALATE
DIETHYL phthalate
Polystyrene
Trimethyl phosphate

Answer :A::B
Discussion
7467.

The Type of hybridisation in diborane is

Answer»

SP-HYBRIDIZED
`sp^(2)`- hybridized
`sp^(3)`-hybridized
`sp^(3) d^(2)`-hybridized

Answer :C
Discussion
7468.

Which of the following is not correct regarding terylene ?

Answer»

STEP - growth polymer
SYNTHETIC fibre
CONDENSATION polymer
Thermosetting plastic

Solution :TERYLENE is not a step growth polymer.
Discussion
7469.

Which of the following reactions is possiblw?

Answer»

`C_(6)H_(5)OH+HBr to C_(6)H_(5)Br+H_(2)O`
`(CH_(3))_(3)C Cl+NaOCH_(3) to (CH_(3))_(3)COCH_(3)+NACL`

ANSWER :D
Discussion
7470.

Whichof the followingin morebasic?

Answer»

`CH_(3)NH_(2)`
`(CH_(3))_(2)NH`
`(CH_(3))_(3)N`
`NH_(3)`

ANSWER :B
Discussion
7471.

Under standard conditions for all concentrations, the following reactions is spontaneous at 25^@C O_2(g)+4H^+ (aq)+4Br^(-) (aq) to 2H_2O (l) +2Br_2 (l), E^@=0.16V IF [H^+] is adjusted by adding a buffer of 0.10 M NaOCN and 0.10 M HOCN (K_a=3.5 times 10^-4) what value will E_(cell) have and will the reaction be spontaneous at this [H^+]?

Answer»

SOLUTION :For a buffer solution of HOCN and NaOCN we have
`[H^+]=K_a TIMES ([HOCN])/([NaOCN]) =3.5 times 10^-4 times 0.1/0.1=3.5 times 10^-4`
THUS,
`E_(cell)=E_(cell)^@-0.0591/4 log""1/([H^+]^4[Br^-]^4)`
`=0.16-0.0591/4 log ""1/((3.5 times 10^-4)^4 (1.0)^4)`
`=-0.044V`
Negative VALUE of `E_(cell)` suggests that the GIVEN cell reaction is nonspontaneous when `[H^+]` is adjusted by a buffer solution.
Discussion
7472.

Which of the following is not the characteristic of catalyst?

Answer»

It changes equilibrium point
It initiates the reaction
It alters the RATE of a reaction
It INCREASES the average K.E. of MOLECULES.

Answer :C
Discussion
7473.

Which amongst the following are organometallic compounds ? (P) Al_(2)(CH_(3))_(6)""(Q)K[PtCl_(3).C_(2)H_(2)] (R ) N(CH_(3))_(3)

Answer»

P only
R only
P and Q only
P, Q and R

Solution : An ORGANOMETALLIC COMPOUND has metal-carbon bond (`delta` or `PI` any).
Discussion
7474.

Which is the most abundant inert gas element in air?

Answer»

SOLUTION :ARGON
Discussion
7475.

Why are phenols more acidic than alcohols. Give two reactions to show that phenols are acidic in nature.

Answer»

Solution :Since the phenoxide ion left after the REMOVAL of a proton is stabilized by resonance whereas alkoxide ion (left after the removal of a proton from alcohol) is not. Therefore, phenols are more acidic than alcohols.
the TWO reactions of phenol showing its acidic natrue are:
`C_(6)H_(5)OH +NaOH to C_(6)H_(5)ON a+H_(2)O`
(II) Phenols react with metallic sodium to EVOLVE `H_(2)` gas.
`2C_(6)H_(5)OH+2Na to 2C_(6)H_(5)ON a+H_(2)`
Discussion
7476.

The spontaneous movement of solute particles from a more concentrated solution to less concentrated solution is called:

Answer»

Osmosis
Diffusion
Plasmolysis
Fusion

Answer :B
Discussion
7477.

Which of the following is trihydric alcohol ?

Answer»

GLYCINE
GLYCEROL
GLYCOL
2-heptanol

SOLUTION :`HOCH_2CHOHCH_2OH` is a glycerol and trihydric ALCOHOL.
Discussion
7478.

Which of the following condition will increase the voltage of the cell, represented by the equation Cu_((s))+2Ag_((aq))^(+)toCu_((aq))^(2+)+2Ag_((s))

Answer»

INCREASE in the concentration of `AG^(+)` ion
Increase in the concentration of `Cu^(+)` ion
Increase in the DIMENSION of silver electrode
Increase in the dimension of copper electrode

Solution :Increase in the concentration of `Ag^(+)` ion increase the voltage of the cell.
Discussion
7479.

Write the structural formula of all the molecular formula C_5H_(11)Cl.Name each structure according to IUPAC system and classify them as primary , secondary or tertiary chloride.

Answer»

Solution :(i) `CH_3CH_2CH_2CH_2CH_2Cl`
1 - Chloropentane (Primary/ `1^0`)
(ii) `CH_3CH_2CH_2CH(CL)CH_3`
2 - Chloropentane (SECONDARY / `2^0`)
(iii) `CH_3CH_2CH(Cl)CH_2CH_3`
3 - Chloropentane (secondary / `2^0` )
(IV) `(CH_3)_2CHCH_2CH_2Cl`
1 - Chloro - 3 - methylbutane (primary / `1^0`)
(V) `(CH_3)_2CHCH(Cl)CH_3`
2 - Chloro - 3- methylbutane (secondary/`2^0` )
(vi) `(CH_3)_2C(Cl)CH_2CH_32`
Chloro - 2- methylbutane (TERTIARY / `3^0`)
Discussion
7480.

Which of the following statements are correct (a) the boiling point of a solution is greater than pure solvent (b) the temperature where the vapour pressure of liquid equals to atmospheric pressure is called its boiling point (c) the vapour pressure of pure solvent is less than the vapour pressure of solution containing non volatile solute. (d) the temperature of liquid remained in the container after evaporation is more than before the evaparation

Answer»

a,b
b,c
c,d
a,d

Answer :A
Discussion
7481.

What is the effect of synergic bonding interactions in a metal carbonyl complex ?

Answer»

SOLUTION :Synergic bonding STRENGTHENS the BOND between the METAL M and CO.
Discussion
7482.

Which of the following is double salt ?

Answer»

Carnallite
Mohr's salt
Alum
All are correct

Answer :D
Discussion
7483.

When cellulose is boiled with dilute H_(2)SO_(4) it gives

Answer»

D-glucose
D-Fructose
DEXTRINE
STARCH

SOLUTION :D-Glucose
Discussion
7484.

Which of the following is not conjugate pair of acid base ?

Answer»

HS and `S^-2`
`H_3O^+` and `OH^-`
HONO and NO_2
`C_6H_5COOH` and `C_6H_5COO^-`

ANSWER :A
Discussion
7485.

Which of the following is not an example of the isomerism in complex compounds

Answer»

IONISATION isomerism
Hydrate isomerism
Position isomerism
Ligand isomerism

Answer :C
Discussion
7486.

What are electrolytes ? Distinguish between metallic electrodes and electrolytes.

Answer»


ANSWER :
Discussion
7487.

Which electronic configuration repersents a transition element ?

Answer»

`1s^2,2s^2 2p^6,3s^2 3p^6 3d^10, 4s^2 4p^6`
`1s^2,2s^2 2p^6,3s^2 3p^6 3d^10, 4s^2 4p^1`
`1s^2,2s^2 2p^6,3s^2 3p^6 3d^2, 4s^2 `
`1s^2,2s^2 2p^6,3s^2 3p^6 , 4s^2 `

ANSWER :C
Discussion
7488.

Who was awarded Nobel prize for chemistry in 1901 for discovering laws of osmotic pressure for solutions

Answer»

van't Hoff
Pauling
Berkeley
Seaberg

Solution :Vant Hoff's was FIRST Nobel PRIZE winner in CHEMISTRY.
Discussion
7489.

Which one of the following reaction is an example of disproporationation reaction

Answer»

ALDOLCONDENSATION
cannizaroreaction
Benzoincondensation
NONEOF these

SOLUTION :
Discussion
7490.

What happens when ethylamine is treated with C_6H_5CHO.

Answer»

Solution :When ethylamine condense with aromatic ALDEHYDE (BENZALDEHYDE) SCHIFF's base is formed.
`{:(C_6H_5CHO+H_2NC_2H_5 to C_6H_5CH=NC_2H_5+H_2O),("Schiff's base Benzal -ethylamine "):}`.
Discussion
7491.

The weight of hydrogen deposited at cathode when 965 amperes current is passed for 100 seconds through acidulated water is

Answer»

0.1g
0.01g
1g
2g
Discussion
7492.

Which of the following is not true about potash alum

Answer»

its empirical formula is `KA(SO_(4))_(2).12H_(2)O`
IT aqueus solution is BASIC
It is used in dyeing INDUSTRIES
On heating it melts in its water of CRYSTALLIZATION

ANSWER :A
Discussion
7493.

Which of the following pair of electrons is excluded from an atom ?

Answer»

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

ANSWER :A
Discussion
7494.

There is some evidence that exposure to carbon tetrachloride causes ___________cancer in humans.

Answer»


ANSWER :LIVER
Discussion
7495.

Which of the following is a polymer containing nitrogen ?

Answer»

Terylene
Teflon
PVC
Nylon

Answer :D
Discussion
7496.

Write the IUPAC name of following complexes.[Pt(NH_3)_2CI_2]

Answer»

SOLUTION :DICHLORO diammine PLATINUM (H)
Discussion
7497.

Which one of the following materials conducts electricity ?

Answer»

diamond
barium SULPHATE
crystalline SODIUM chloride
fused POTASSIUM chloride
Discussion
7498.

Which of the following will not undergo HVZ reaction ?

Answer»

Propanoic acid
Ethanoic acid
2 - Methylpropanoic acid
2, 2 - Demethylpropanoic acid

SOLUTION :2, 2-Dimethylpropanoic acid will not UNDERGO HVZ reaction due to absence of `ALPHA`-H atom.
Discussion
7499.

When are condensation methods used for the preparation of colloids?

Answer»

Solution :When the SUBSTANCE for COLLOIDAL particle is present as small SIZED particle, molecule or ION, they are BROUGHT to the colloidal dimension by condensation methods.
Discussion
7500.

Which of the following will show optical isomers? (I) cis-[Co(NH_(3))_(2)(en)_(2)]^(3+) (II) trans-[IrCl_(2)(C_(2)O_(4))_(2)]^(3-) (III) [Rh(en)_(3)]^(3+) (IV) cis-[IR(H_(2)O)_(3)Cl_(3)]

Answer»

I, III only correct
II, IV only correct
I, III, IV only correct
III only correct

Answer :A
Discussion