Who among the following discovered the neutrons?

Which of the following pairs of ‘number –composition’ is correct?
I. Atomic number – number of protons
II. Mass number – Sum of number of neutrons and protons

What is the colour of the outer zone of completion combustion of a candle flame?

What is the atomic mass of sodium?

According to which of the following laws, the pressure of a mixture of gases is equal to the sum of the partial pressures of the component gases?

By which of the following process can we separate two miscible liquids?

Which of the following statements is correct?

Which of the following is the correct representation of the number of atoms?

Which of the following statements is/are correct?
I. Salts of a strong acid and weak base are acidic with pH value less than 7.
II. When electricity is passed through an aqueous solution of sodium chloride (called brine), it decomposes to form sodium oxide.

Among the following, in which material the speed of sound is highest (at 25°C)?

When lead nitrate is heated, then which of the following gases is produced?

What is the pH of human blood?

An isotope of which of the following is used in the treatment of cancer?

The total pressure of a mixture of ideal gases is the sum of partial pressures. This is ____ law of partial pressures.

What is the maximum number of electrons that the third orbit or M-shell can have?

Which of the following statement is NOT correct regarding Rutherford’s nuclear model of an atom?

Which of the following is monoatomic?

Which of the following pairs of ‘elements – valency’ is correct?
I. Boron – 2
II. Fluorine – 3