A prism has 3 rectangular surfaces.

Silicon is a common example of a semiconductor.

The thick wire will carry more current when connected to the same potential difference.

Misuse of Nuclear Fission Reaction:

One misuse of nuclear fission reactions is in the creation of nuclear weapons.

OR

The release of a huge amount of energy in nuclear fusion is explained by Einstein’s mass-energy equivalence principle, which is given by the equation:

E=mc²

1. c) Al
2. d) Li
3. a) Cu
4. b) Be

Lewis dot structure of the N₂ molecule

Direct current (DC) electricity is used in electrolysis.

OR

Cathode Reaction in the Electrolysis of Acidulated Water Using Platinum Electrodes:

2H₂O + 2e^- → H₂ + 2OH^-

This reaction produces hydrogen gas at the cathode.

In electroplating gold on brass, the electrolyte used is typically a gold chloride solution or gold cyanide solution.

The reaction of ammonia with Nessler’s reagent forms a yellow or brown colour.

The formula of the precipitate formed when H₂S gas is passed through an aqueous solution of silver nitrate is Ag₂S (silver sulfide).

OR

The compound formed by the reaction of nitrogen with magnesium metal at a high temperature is magnesium nitride.

The H-C-H bond angle in methane is 109.5°.

OR

The IUPAC name of CH₃CH₂COOH is propanoic acid.

The industrial source of CNG (Compressed Natural Gas) is natural gas, which primarily consists of methane (CH₄)