Liquefied petroleum gas or liquid petroleum gas (LPG) is mostly propane (C₃H₈), or butane (C₄H₁₀). They are most commonly mixtures of these two hydrocarbon gases that are used as fuel in heating appliances, cooking equipment, and vehicles.In the northern hemisphere winter, the mixes contain more propane, while in summer, they contain more butane.

Correct Option: C

Liquefied petroleum gas or liquid petroleum gas (LPG) is mostly propane (C₃H₈), or butane (C₄H₁₀). They are most commonly mixtures of these two hydrocarbon gases that are used as fuel in heating appliances, cooking equipment, and vehicles.In the northern hemisphere winter, the mixes contain more propane, while in summer, they contain more butane.

Zeolites are hydrated aluminosilicate minerals made from interlinked tetrahedra of alumina (AlO₄) and silica (SiO₄). In simpler words, they’re solids with a relatively open, three-dimensional crystal structure built from the elements aluminium, oxygen, and silicon, with alkali or alkaline-Earth metals (such as sodium, potassium, and magnesium) plus water molecules trapped in the gaps between them.

Correct Option: A

Zeolites are hydrated aluminosilicate minerals made from interlinked tetrahedra of alumina (AlO₄) and silica (SiO₄). In simpler words, they’re solids with a relatively open, three-dimensional crystal structure built from the elements aluminium, oxygen, and silicon, with alkali or alkaline-Earth metals (such as sodium, potassium, and magnesium) plus water molecules trapped in the gaps between them.

Acid rain is caused by emissions of sulfur dioxide (SO₂) and nitrogen oxide (_x), which react with the water molecules in the atmosphere to produce acids.The SO₂and NOX react with water, oxygen and other chemicals to form sulfuric and nitric acids.The chemicals in acid rain can cause paint to peel, corrosion of steel structures and weathering of stone buildings.

Correct Option: B

Acid rain is caused by emissions of sulfur dioxide (SO₂) and nitrogen oxide (_x), which react with the water molecules in the atmosphere to produce acids.The SO₂and NOX react with water, oxygen and other chemicals to form sulfuric and nitric acids.The chemicals in acid rain can cause paint to peel, corrosion of steel structures and weathering of stone buildings.

Terylene is a co-polymer of ethylene glycol and Terephthalic acid. Also known as Dacron, it is prepared by the condensation polymerization of ethylene glycerol and Terephthalic acid with elimination of water. The reaction is carried out at about 420-460 K in the presence of a catalyst consisting of a mixture of zinc acetate and antimony trioxide.

Correct Option: D

Terylene is a co-polymer of ethylene glycol and Terephthalic acid. Also known as Dacron, it is prepared by the condensation polymerization of ethylene glycerol and Terephthalic acid with elimination of water. The reaction is carried out at about 420-460 K in the presence of a catalyst consisting of a mixture of zinc acetate and antimony trioxide.

Deep-sea divers have their oxygen supply mixed with helium in order to avoid the toxic nature of oxygen under extreme pressures. The Helium atom is much smaller than the Nitrogen molecule, has a smaller electron cloud and is less polarizable. It, therefore, is less soluble in blood than nitrogen and prevents the formation of nitrogen bubbles in blood which blocks blood flow as the diver comes to the surface of the sea from underwater.

Correct Option: D

Deep-sea divers have their oxygen supply mixed with helium in order to avoid the toxic nature of oxygen under extreme pressures. The Helium atom is much smaller than the Nitrogen molecule, has a smaller electron cloud and is less polarizable. It, therefore, is less soluble in blood than nitrogen and prevents the formation of nitrogen bubbles in blood which blocks blood flow as the diver comes to the surface of the sea from underwater.