NEET Practice Questions (MCQs) with Answers & Solutions

Halogens can mutually displace each other from the solution of their compounds with metals. This property is based on their relative reactivity: a more reactive halogen can displace a less reactive halogen from its compounds. For example, chlorine can displace bromine and iodine from their salts.

Among the options given, $N_2$ (nitrogen) is not a greenhouse gas. Greenhouse gases are those that can trap heat in the Earth's atmosphere, such as $CO_2$ (carbon dioxide), $CH_4$ (methane), and $O_3$ (ozone). Nitrogen, however, does not have this property and thus is not considered a greenhouse gas.

Chlorine gas is dried over concentrated sulfuric acid ($\text{Conc. H}_2\text{SO}_4$). This is because concentrated sulfuric acid is a strong dehydrating agent and effectively removes moisture from the chlorine gas without reacting with it.

Chlorine is used in water primarily for killing germs. It acts as a disinfectant by destroying bacteria, viruses, and other pathogens, making the water safe for drinking and other uses. This process is known as chlorination.

Chlorine is widely used as a bleaching agent, for sterilisation, and in the preparation of antiseptics. However, it is not used in the extraction of silver and copper.

The bonding in HCl is polar covalent. This is because chlorine (Cl) is more electronegative than hydrogen (H), resulting in an unequal sharing of electrons. This creates a dipole moment, with a partial negative charge on the chlorine atom and a partial positive charge on the hydrogen atom.

Tincture of iodine is an alcoholic solution of iodine. It typically consists of iodine dissolved in ethanol or another type of alcohol, and it is used as an antiseptic.