Question No : 1
Which of the following is not a chemical change?
Question No : 2
Which of the following is not a physical change?
Question No : 3
The atomic number of an element represents
Question No : 4
Which of the following statements regarding natural radioactivity is true?
Question No : 5
Gases have
Question No : 6
The most abundant constituent in air is
Question No : 7
Ethyl alcohol is