With reference to 'Isotopes', which of the following statements is/are correct? 1. Atoms with identical atomic numbers but different atomic mass numbers are known as isotopes. 2. Protium, Deuterium and Tritium are isotopes of carbon.

Which one among the following pairs is NOT correctly matched?

Which one of the following general electronic configurations correctly represent a transition metal element?

Who was the first one to propose a model for the structure of an atom?

Dalton's atomic theory successfully explained i Law of conservation of mass. ii. Law of constant composition. iii. Law of radioactivity. iv. Law of multiple proportion.

With reference to 'acid and bases', which of the following statements is/are correct? 1. Acidic solutions have pH more than 7. 2. Basic solutions have pH less than 7.