Write two methods to identify carbondioxide.

Write a method to identify the hydrogen gas.

Write two uses of ClO2

Write any two methods to provide first aid in the case of electric shock.

Rapid increases in human population is called population explosion. Write two methods to control over population.

There is a murder, which shocked the entire town. The dead body contain the blood smear of other person. The police suspected two persons. Name the method used to identify the murderer.

Semiconductors having extra purity is widely used in the field of electronics and computers.Write a method to purify semiconductors.

20 g of a magnesium carbonate sample decomposes on heating to give carbondioxide, and 8g magnesium oxide. What will be the percentage purity of MgCO_(3) ,in the sample