CBSE 11TH CHEMISTRY - Online Test

Answer : Option C
Explaination / Solution:

Yves Chauvin, Robert H. Grubbs and Richard R Schrock won the noble prize in 2005 for designing the method of metathesis.

Answer : Option D
Explaination / Solution:

Due to cage like structure of ice , for same mass of water and ice. Volume of ice is greater than that of water therefore density of ice is less than that of water.

Answer : Option C
Explaination / Solution:

CO2 is linear, so even though the C−O bonds have individual dipole moments, the overall dipole moment is zero as these cancel out (they point in opposite directions, as shown in the diagram below).

On the other hand, H2O is "bent", which means that the individual dipole moments of the bond are at an angle to each other and because of Presence of lp on head of O atom in H2O therefore it has max dipole moment.

Answer : Option A
Explaination / Solution:

Greater the lattice energy, higher is the melting point of the MX (metal halide) and lower is its solubility

Answer : Option B
Explaination / Solution:

alkyl halides donot give alkyl halides.

Answer : Option D
Explaination / Solution:

Water molecules form extensive Hydrogen Bonds.

Answer : Option B
Explaination / Solution:

ΔG=-RTlnK

Answer : Option D
Explaination / Solution:

Whenever a reaction between an oxidising agent and a reducing agent is carried out, a compound of lower oxidation state is formed if the reducing agent is in excess and a compound of higher oxidation state is formed if the oxidising agent is in excess. This can be illustrated as follows:

 P4 and F2 are reducing and oxidising agents respectively. If an excess of P4 is treated with F2, then PF3 will be produced, wherein the oxidation number (O.N.) of P is +3.
PF4(excess)+F2→PF3

Answer : Option A
Explaination / Solution:

The given equation gets balanced by inserting coefficients  ( 4 , 3 , 2  )  in  blank spaces  from LHS to  RHS ) . The balanced equation is - 

Answer : Option C
Explaination / Solution:

Boiling point depends on molecular mass and surface area.As the number of carbon atoms increase,boiling point increases ,hence n-butane has the minimum boiling point.Among isomeric alkanes,boiling point decreases with branching.Hence the order.