1.
Which of the following is correct combination of masses of the three sub-atomic particles?

2.
Which of the following is correct electronic configuration of Krypton, whose atomic number is 36?

3.
Which of the following isotope of Hydrogen has only one neutron?

4.
Which of the following salts and their chemical names are correctly paird?
1: White vitriol – Zinc sulfate
2: Red Vitriol – Copper sulfate
3: Green Vitriol – Ferrous sulfate
Select the correct option from the codes given below:

5.
Crystals of a compound changes its blue color to white on heating in a closed container. However, it regains blue color after sometime when allowed to cool down. This compound is of which of the following metals?

6.
Which does the gas turn lime water milky?

7.
Seaweeds are an important source of which of the following?

8.
Which gas is used to manufacture vanaspati from vegetable oil?

9.
The nucleus of an atom consists of which of the following?

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