The atomic nucleus was discovered by 

Burning of Hydrogen produces 

Which of the following is not a normal salt?

The atoms, in which the number of Protons is same but the number of neutrons is different, are known as – 

How many categories of elements are divided on the basis of properties?

The percentage of nitrogen present in ammonium sulphate is: 

Baking soda is 

Gold is alloyed with which metal to make it harder?