A glass of water does not turn into ice as it reaches 0^o C. It is because

Sometimes, indigestion is caused by the secretion of too much hydrochloric acid in the stomach. To ease the pain caused, a tablet can be taken that reacts to reduce the amount of acid present. Which one among the following would be inappropriate for a manufacturer to include as a major reactant in the tablet?

Which of the following pairs is/are correctly matched?

1. Isotopes: Atoms with same atomic number but different atomic mass
2. Isobars: Atoms with same number of neutrons but different atomic number
3. Isotones: Atoms with same mass number but different atomic number

Select the correct answer using the code given below:

Which one among the following is correct regarding ²⁰Ne, ²³Na⁺, ¹⁹F^- and ²⁴Mg²⁺?

During explosion of gunpowder, which of the following gases are evolved in the proportion of 1 : 3?

The metal constituent of chlorophyll is