1. Answer any ten parts of the following:

Which of these orbitals does not exist 4d

What principle is violated in the following electronic configuration -1s2 2p l

Which of these is larger in size

Which of the elements Na, Ne and P has the highest first ionization energy

Name the most electronegative element in the periodic table.

Give the reaction between sodium and D20.

What type of bonding will you expect in NaH?

(viii) Which is the only alkali metal that reacts with nitrogen forming a nitride?

Name the effect due to which carbon is tetravalent, but lead is divalent.

Give an example of a molecule which has a three centre two electron (3c bond.

Draw the structure of hydrazine.

Which is the only group 15 element that is a gas at room temperature and atmospheric pressure?

(xiii) Which of the acids HF, Hel, HBr and HI is the strongest acid

Write the formula of potassium trioxalatoferrate (III).

What are the two main components of brass?

2. Answer any five parts of the following

Why is the second ionization energy of an element larger than the first ionization energy

Differentiate between electron affinity and electronegativity. Why are the electron affinities ofnoble gases zero?

What is the effect of hydrogen bonding on the properties ofH20, HF and NH3

Why are compounds of lithium more covalent than the corresponding compounds of sodium and potassium

Why do hydrides and halides of beryllium polymerize?

What are the criteria of selection of a good reducing agent for extraction of metals (Mention two points)

Define the terms calcination and roasting and give one example in each case.

Answer any three parts of the following:

Why is the B-F bond length in BF3 shorter than the sum of covalent radii of B and

What properties are responsible for the anomalous behaviour of carbon?

Will you expect ammonia to act as a Lewis acid or Lewis base? Justify your answer.

Why are trihalides of nitrogen not oxidized to pentahalides

Why does oxygen exist as a diatomic molecule and sulphur a polyatomic molecule at room temperature?

What are the main steps involved in the . manufacture of nitric acid Give the reaction of concentrated nitric acid with copper or phosphorus.

OR

What is the catalyst used in the Contact process for manufacture of sulphuric acid? Why is SO3 not directly dissolved in water during preparation of sulphuric acid? Write the formulae of two peroxo acids of sulphur.

4. Answer any five parts of the following:

Deduce the oxidation number of the halogen atom in each of the following:

HOBr

HOIO3

HOClO

HOBr02

Using V8EPR theory predict the shape of IF7. Using Valence Bond theory explain the hybridisation of iodine in this compound.

Write the formulae of the binary compounds formed between xenon and fluorine. What is the hybridisation of xenon in anyone of them?

What phenomenon is responsible for similarity in sizes and properties of Zr and Hf? Explain briefly.

Write the names of any two of the following:



K[AuCl4]

Br3

What type of isomerism is noted III [PtCl2(NH3)2] Draw the isomers.

Write the electronic configuration of copper (atomic number 29) and explain why it does not follow the Aufbau order.

Pick the species which matches the statement and give very brief reasons for your choice (any four)

Statement Species

Coloured species CuS04, ZnS04

Higher magnetic moment

Bidentate ligand Oxalate, thiocyanate

Common oxidation state of lanthanides

Impurity present in minerals Flux, gangue

Mond process Cobalt, nickel

Name a substance containing silicon which is used as a

dehydrating agent

cation exchanger

lubricant

thermal insulator

OR

Write the formulae of the compounds you will expect when the following elements combine:

Boron and Oxygen

Magnesium and Nitrogen

Calcium and Carbon

Potassium and Oxygen (superoxide)