Bihar TET · Mathematics and Science (Paper II)
Atoms, molecules, elements and compounds.
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Q1 · Matter and its Nature · EASY
Which of the following is a molecule of an element?
Q2 · Matter and its Nature · MEDIUM
A student observes that a substance cannot be broken down into simpler substances by any chemical means. What can the student conclude about this substance?
Q3 · Matter and its Nature · MEDIUM
The ratio of hydrogen to oxygen atoms in water (H2O) is 2:1 by count. If 18 g of water contains approximately 6.02 × 10^23 molecules, how many hydrogen atoms are present in 18 g of water?
Q4 · Matter and its Nature · HARD
A compound X is formed when element A (valency 2) combines with element B (valency 3). If the atomic mass of A is 24 u and that of B is 16 u, what is the molecular mass of the simplest formula of compound X?
Q5 · Matter and its Nature · MEDIUM
When a liquid changes to a gas at its boiling point, the process is known as: