Increasing order of reactivity of the following compounds for substitution is :
a) |
|
b) |
|
c) | d) |
Correct Option: c
View SolutionIn an acid -base titration , solution was added to the
solution of unknown strength . Which of the following correctly shows the change of
of the titration mixture in this experiment ?
a) |
|
b) |
|
c) | d) |
Correct Option: b
View SolutionThe peptide that gives positive ceric ammonium nitrate and carbylamine tests is:
a) |
Ser-Lys |
b) |
Gln-Asp |
c) | Lys-Asp |
d) | Asp-Gln |
Correct Option: a
View SolutionThe structure of beryllium chloride in the solid state and vapour phase , respectively , are :
a) |
Chain and chain |
b) |
Dimeric and dimeric |
c) | Chain and dimeric |
d) | Dimeric and chain |
Correct Option: c
View SolutionHinsberg's reagent is:
a) |
|
b) |
|
c) | d) |
Correct Option: c
View SolutionThe maximum number of possible oxidation states of actinoides are shown by :
a) |
nobelium (No) and lawrencium (Lr) |
b) |
Actinium (Ac) and thorium (Th) |
c) | Berkelium (Bk) and californium (Cr) |
d) | Neptunium (Np) and plutonium (Pu) |
Correct Option: d
View SolutionAssertion : For the extraction of iron , haematite ore is used.
Reason : Haematite is a carbonate ore of iron
a) |
Only reason is correct . |
b) |
Both the assertion and reason are correct , but the reason is not the correct explanation for the assertion . |
c) | Both the assertion and reason are correct and the reason is the correct explanation for the assertion. |
d) | Only the assertion is correct . |
Correct Option: d
View SolutionHF has the highest boiling point among hydrogen halides because it has :
a) |
Strongest vander waals interaction |
b) |
Lowest ionic character |
c) | Strongest hydrogen bonding |
d) | Lowest dissociation enthalpy |
Correct Option: c
View Solution of
surfactant solution forms a monolayer covering
on a polar substrate . If the polar head is approximated as a cube , what is its edge length (in pm) ?
a) |
1 |
b) |
2 |
c) | 5 |
d) | 2.5 |
Correct Option: b
View SolutionConsider the given plot of enthapy of the following reaction between A and B .
Identify the incorrect statement .
a) |
Activation enthapy to form C is |
b) |
C is the thermodynamically stable product. |
c) | D is kinetically stable product . |
d) | Formation of A and B from C has highest enthaply of activation . |
Correct Option: a
View SolutionMolal depression constant for a solvent is . The depression in the freezing point (in K) of the solvent for
solution of K2SO4 is :
( Assume complete dissociation of the electrolyte )
a) |
0.36 |
b) |
0.24 |
c) | 0.12 |
d) | 0.18 |
Correct Option: a
View SolutionDuring compression of a spring the work done is escaped to the surrounding as heat . The change in internal energy ,
is :
a) | -12 | b) | -8 |
c) | 8 | d) | 12 |
Correct Option: c
View SolutionThe correct statement among I to III regarding group 13 element oxide are ,
I. Boron trioxide is acidic.
II. Oxides of aluminium and gallium are amphoteric.
III. Oxides of indium and thallium are basic .
a) |
I and II only |
b) |
I , II and III |
c) | I and III only |
d) | II and III only |
Correct Option: b
View SolutionWhich one of the following about an electron occupying the 1s orbitals in a hydrogen atom is incorrect ? ( The Bohr radius is represented by )
a) |
The probability density of finding the electron is maximum at the nucleus. |
b) |
The electron can be found at a distance |
c) | The magnitude of the potential energy is double that of its kinetic energy on an average . |
d) | The total energy of the electron is maximum when it is at a distance |
Correct Option: d
View SolutionThe amorphous form of silica is :
a) |
Tridymite |
b) |
Kieselguhr |
c) | Cristobalite |
d) | Quartz |
Correct Option: b
View SolutionWhat would be the molality of 20% (w/w) aqueous solution of KI?
( molar mass of KI =166 g mol-1 )
a) |
1.08 |
b) |
1.35 |
c) | 1.48 |
d) | 1.51 |
Correct Option: d
View SolutionThe layer of atmosphere between 10 km to 50 km above the sea level is called as:
a) |
Troposphere |
b) |
Thermosphere |
c) | Stratosphere |
d) | Mesosphere |
Correct Option: c
View SolutionWhich of the following potential energy (PE) diagram represents the reaction ?
a) |
|
b) |
|
c) |