Science (English Medium) इयत्ता ११ - CBSE Question Bank Solutions for Chemistry

Describe the general trends in the following properties of the elements in Groups 13 and 14.

Metallic character

Describe the general trends in the following properties of the elements in Groups 13 and 14.

Oxidation states

Describe the general trends in the following properties of the elements in Groups 13 and 14.

Nature of halides

Account for the following observations:

Though fluorine is more electronegative than chlorine yet BF₃ is a weaker Lewis acid than BCl₃ 

Account for the following observations:

PbO₂ is a stronger oxidising agent than SnO₂ 

Account for the following observations:

The +1 oxidation state of thallium is more stable than its +3 state.

Three pairs of compounds are given below. Identify that compound in each of the pairs which has group 13 element in more stable oxidation state. Give reason for your choice. State the nature of bonding also.

TlCl₃, TlCl

Three pairs of compounds are given below. Identify that compound in each of the pairs which has group 13 element in more stable oxidation state. Give reason for your choice. State the nature of bonding also.

AlCl₃ , AlCl

Three pairs of compounds are given below. Identify that compound in each of the pairs which has group 13 element in more stable oxidation state. Give reason for your choice. State the nature of bonding also.

InCl₃, InCl

BCl₃ exists as monomer whereas AlCl₃ is dimerised through halogen bridging. Give reason. Explain the structure of the dimer of AlCl₃ also.

Boron fluoride exists as BF₃ but boron hydride doesn’t exist as BH₃. Give reason. In which form does it exist? Explain its structure.

A nonmetallic element of group 13, used in making bullet proof vests is extremely hard solid of black colour. It can exist in many allotropic forms and has unusually high melting point. Its trifluoride acts as Lewis acid towards ammonia. The element exihibits maximum covalency of four. Identify the element and write the reaction of its trifluoride with ammonia. Explain why does the trifluoride act as a Lewis acid.

Name the compounds whose line formulae are given below:

Name the compounds whose line formulae are given below:

Write structural formulae for compounds named as-

1-Bromoheptane

Write structural formulae for compounds named as-

5-Bromoheptanoic acid

Arrange the following in decreasing order of their boiling points.

(A) n-butane

(B) 2-methylbutane

(C) n-pentane

(D) 2, 2-dimethylpropane

Match the reagent from Column I which on reaction with CH₃ – CH = CH₂ gives some product given in Column II as per the codes given below:

Assertion (A): Among isomeric pentanes, 2, 2-dimethylpentane has highest boiling point.

Reason (R): Branching does not affect the boiling point.

Which of the following gases is not a green house gas?