(4)

Electronic configuration of X is 2, 8 = 10 (it is same as the electronic configuration of Neon) Thus, element X is a noble gas element.

Electronic configuration of Y is 2, 8, 7 = 17 (It is same as the electronic configuration of chlorine atom which belongs to halogen family and is a non-metal). Thus, element Y is a non-metal.

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(3)

The electrical characteristics such as electrical insulating properties or dielectric constant of PVC (polyvinyl chloride) are high due to which it is used as an insulating material. To prevent any accidental contact with other conductors, the metallic part of an electrical wire are covered with PVC.

(3)

Metals are good conductors of electricity. Metals are sonorous in nature which means on striking them they make a ringing sound.
Metals are lustrous which means they have shiny appearance. Metals are ductile which means they can be drawn into long thin wires. Hence, the property not shown by metals is dullness.

(2)

$C{u}^{2+}$ion travels towards the negative terminal, i.e. iron plate, and deposits on it because it is positively charged. As a result, the iron plate is copper-plated. Since copper atoms enter the solution from the positive terminal, i.e., the copper plate, there is no shortage of copper atoms.

(2)

Ductility is the property by which metals can be drawn into long thin wires without breaking. Gold, silver and platinum are often drawn into long stands for use in jewellery. However, gold has a significantly greater ductility than platinum and it is considered as the earth’s most ductile metals as one ounce of gold could be drawn to a length of 50 miles.

(1)

Non-metals react with oxygen to form non-metallic oxide. Non-metallic oxide such as sulphur dioxide and nitrogen dioxide present in air are responsible for acid rain as they react with the moisture present in air and forms the acidic compounds.

(2)

Oxides of metals are basic in nature because they react with water to form metal hydroxides which are alkaline in nature. These metal hydroxides when dissolved in water release $O{H}^{-}$ ions in solution which will turn red litmus solution to blue. Therefore, non-metallic oxides are acidic in nature.

(3)

Food cans are coated with tin and not with zinc because zinc is above the tin in the reactive series and can react with the food items and alter their taste. Hence, due to this reason food cans are coated with tin and not with zinc.

(2)

Silver (Ag) metal would be displaced from the solution of its salts by other three metals because silver is less reactive than magnesium (Mg), zinc (Zn) and copper (Cu).