Assertion : Staggered conformation of ethane is 12.5 kJ mol-1 more stable than the eclipsed conformation.
Reason : The two conformations of ethane cannot be separated at room temperature.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false.
Assertion : The Dumas method is more applicable to nitrogen containing organic compounds than the Kjeldahl's method.
Reason: The Kjeldahl's method does not give satisfactory results for compounds in which nitrogen is directly linked to oxygen.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false
If both assertion and reason are false
How many Faradays of electricity are required for the given reaction to occur ?
MnMn2+
5 F
3 F
1 F
7 F
Paints and hair creams are respectively
sol and emulsion
aerosol and foam
emulsion and sol
foam and gel.
A.
sol and emulsion
Paints and hair creams are sol and emulsions.
Paints - Solid in liquid type colloid
Hair cream- Liquid in liquid type colloid
Arrange the given compounds in decreasing order of boiling points.
I. CH3CH2CH2CH2Br
II. C(CH3)3Br
III. CH3-CH2-CH(CH3)-Br
I > III > II
II > I > III
I > II > III
III > I > II
If an atom crystallises in bee lattice with r= 4 Å then the edge length will be
2 Å
8 Å
2.39 Å
9.23 Å
A first order reaction, which is 30% complete in 30 minutes has a half-life period of
102.2 min
58.2 min
24.2 min
120.2 min
Two elements A and B form compounds of formula AB2 and AB4. When dissolved in 20.0 g of benzene 1.0 g of AB2 lowers freezing point by 2.3°C whereas 1.0 g of AB4 lowers freezing point by 1.3°C. The Kf for benzene is 5.1. The atomic masses of A and B are
25, 42
42, 25
52, 48
48, 52