Which particular property of cast iron makes it unsuitable for the construction of bridges.

42.

Choose the letter A, B,C or D to match the description given below:

A. Ammonia
B. Hydrogen chloride
C. hydrogen sulphide
D. sulphur dioxide

This gas can be oxidized to sulphur. 

Choose the letter A, B,C or D to match the description given below:

A. Ammonia
B. Hydrogen chloride
C. hydrogen sulphide
D. sulphur dioxide

This gas decolourises potassium permanganate solution.

Choose the letter A, B,C or D to match the description given below:

A. Ammonia
B. Hydrogen chloride
C. hydrogen sulphide
D. sulphur dioxide

When this gas is bubbled through copper sulphate solution, a deep blue coloured solution is formed.

Choose the letter A, B,C or D to match the description (i) to (vi) given below:

A. Ammonia
B. Hydrogen chloride
C. hydrogen sulphide
D. sulphur dioxide

This gas gives a white precipitate when reacted with silver nitrate solution acidified  with dilute nitric acid.

Choose the letter A, B,C or D to match the description given below:

A. Ammonia
B. Hydrogen chloride
C. hydrogen sulphide
D. sulphur dioxide

This gas burns in oxygen with a green flame.

Choose the letter A, B,C or D to match the description given below:

A. Ammonia
B. Hydrogen chloride
C. hydrogen sulphide
D. sulphur dioxide

This gas can be obtained by the reaction between copper and concentrated sulphuric acid.

X, Y and Z are three crystalline solid which is soluble in water and have a common anion to help you to identify X, Y and Z, you are provided with the following experiment observation. Copy and complete the corresponding inferences in (i) to (iv).
 
Write the equations for the following reaction:

1) X and concentrated sulphuric acid (below 200⁰C.) 
one equation only for either of the cation given in INFERENCE 2.)

2) Action of Heat on Y.

The electronegativities (according to Pauling) of the elements in Period 3 of the Periodic table  are as follows with the element arranged in alphabetical order:-

Choose the word or pharse from the bracket which correctly completes each of the following statement;

1) The element below sodium in the same group would be expected to have a ......................(lower/higher) electronegativity than sodium and the element above chlorine would be expected to have a .......................(lower/higher) ionisation potential than chlorine.

2) On moving from left to right in a given period, the number of shells (remains the same,' increases/decreases).

3) On moving down a group, the number of valence electrons (remains the same/increases/decreases).