After a discussion about the structures of hydrides of group-15 elements, .Neethu wrote the order of bond angles as `NH_3ltPH_3ltAsH_3`. Also arrange the above hydrides in the increasing order of their thermal stability. Justify your answer.

After a discussion about the structures of hydrides of group-15 elements, .Neethu wrote the order of bond angles as NH_3ltPH_3ltAsH_3 . Justify ‘your answer:

After a discussion about the structures of hydrides of group-15 elements, .Neethu wrote the order of bond angles as NH_3ltPH_3ltAsH_3 . Is this the correct order?

After a discussion about the structures of hydrides of group-15 elements, .Neethu wrote the order of bond angles as NH_3ltPH_3ltAsH_3 . Give the hybridization and shape of these hydrides.

Arrange the following carbocations in the increasing order of their stability. Justify. CH_3^+ , CH_3CH_2^+ , (CH_3)_2CH^+

Arrange the following compounds in the increasing order of thermal stabilities . K_(2)CO_(3)(I),MgCO_(3)(II), BeCO_(3)

Arrange the following Lewis acids in the increasing order of acidic strength. Substantiate your answer. BF_3 , BCl_3 , BBr_3 .

Arrange the following in decreasing order of their bond angle ': H_2 O, NH_3, H_2 S'

Diborane is an important hydride of Boron a. During a class room discussion, a student argues that there is a covalent bond between boron atoms in diborane. What is your opinion. Give justification. b. Boron halides can act as Lewis acids. Give reason. c. Arrange the following Lewis acids in the increasing order of acidic strength. Substantiate your answer? 'BF_3 BCl_3, BBr_3'

A group of ions are given below: Na^+ , Al^3+ , O^2- , Ca^2+ , Mg^2+ , F^- , N^3- , Br^- a) Find the pair which is not isoelectronic. b) Arrange the above ions in the increasing order of size.

The substance which can accept electrons is a Lewis acid. 'BCl_3, BF_3' and 'BBr_3' are Lewis acids. a. Arrange the above Lewis acids in the increasing,order of their acid strength. b. Give reason for this order of acidic strength, c. The chemistry of boron is different from that of other members of the same group. Mention any two differences and give reason.