Fill in the blanks :
................... gas occurs in many spring water, and is an important reducing agent.

Fill in the blanks : ................... gas decolourises potassium permanganate solution

Fill in the blanks : ................... gas dissolves in water to form sulphuric acid.

Fill in the blanks : ................... gas is also known as sulphuretted hydrogen.

Water can act as an oxidising as well as a reducing agent.

Give one reaction each to show that water can act as a reducing agent.

Fill in the Blank (i) .............A............is the blood-chloesterol lowering agent which is produced by the yeast.........B.......... (ii) ............A ....................Produced by the bacterium streptococcus and modified by genetic engineering is used as a...........B..........for removing ..........C.........from blood vessel.

Name : a gas that is an oxidizing as well as a reducing agent.

Fill in the blanks with suitable words : .......... is used as a coagulating agent is rubber industry.

In which of the following reactions does water act as a reducing agent?

Fill in the blanks from the choices given : Metals are good __________'oxidizing agents /reducing agents because they are electron ____________ [acceptors/donors].