A white substance having alkaline nature in solution is

Q. Solution of sodium hydrogen carbonate is alkaline in nature.

Q. Which substance changes its colour from orange to yellow in alkaline solution?

Q. A white crystalline solid 'A' on boiling with caustic soda solution gives a gas 'B', which on passing through an alkaline solution of potassium tetraiodomercurate (II) solution gives a brown ppt. The substance 'A' on heating evolves a neutral gas 'C', which is inert at room temperature and reactive in presence of the catalyst and does not give brown fumes with nitric oxide.

Q.

Fill in the following blanks with suitable words :

(a) Acids have a pH ___ than 7.

(b) Alkalis have a pH ___ than 7.

(c) Neutral substances have a pH of __

(d) The more acidic a solution, the ___ the pH.

(e) The more alkaline a solution, the ___ the pH.