Explan the following in not more than two sentances :
(i) Concentrated `HNO_3` turns yellow in sunlight.
(ii) Bleaching powder loses its bleaching property when it is kept in an open bottle for a long lime.

Explain the following: (a) In the preparation of HI from KI , phosphoric acid is preferred to sulphuric acid. (b) Boiling point of HCl is lower than HF . (c ) Bleaching powder loses its bleaching property when kept in an open bottle for a long time.

Predict the products when the following reactions are carried out: (A)Red lead reacts with concentrated HCl. (B)Ammonia reacts with excess iodine. ( C)Bleaching powder reacts with lead nitrate in alkaline medium. (D)Chlorine is passed through heated freshly precipitated by HgO. (E)In acidic medium when SO_(2) is passed through NaClO_(3) .

Give reason for the following : (i) Chlorine water loses its colour on standing. (ii) The is more acidic than H_(2)S .

Give reason for the following within two sentences: i. Hydrogen bromide cannot be prepared by the action of concentrated sulphuric acid on sodium bromide. ii. When a blue litmus paper is dipped in a solution of hypochlorous acid, it first turns red then gets decolourised.

Explain the following with proper reason: (i) Bleaching of flowers by chlorine is permanent while after bleaching with SO_2 , the colour returns. (ii) Iodine dissolves more in KI solution than in water.

Explain the following with proper reason: (i) Anhydrous HCl is a bad conductor of electricity while aqueous HCl is a good conductor. (ii) HF is not stored in glass bottles but kept in wax lined bottles. (iii) HF has a greater electronegativity difference and more ionic character than HCI, HBr and Hl but it the weakest acid.

Frame linear equations in two variables (x and y) respresenting the following informations : (i) The sun of the ages of Aruna and Anup is 34 years. (ii) the lenth of a rectangle is 12 m more than its breadth. (iii) the cost of a notebook is twice the cost of a pen .