Chemistry in daily life

The chemical formula of common salt is:

• 1 CaCl₂
• 2 Na₂CO₃
• 3 NaCl
• 4 KCl

The gas that makes up most of the Earth's atmosphere is:

• 1 Carbon dioxide
• 2 Oxygen
• 3 Nitrogen
• 4 Argon

Vinegar contains:

• 1 Lactic acid
• 2 Formic acid
• 3 Acetic acid
• 4 Citric acid

Baking soda is chemically:

• 1 Sodium carbonate
• 2 Sodium hydroxide
• 3 Calcium carbonate
• 4 Sodium bicarbonate

Diamond and graphite are both forms of:

• 1 Carbon
• 2 Sulfur
• 3 Phosphorus
• 4 Silicon

The pH of a neutral solution at 25 °C is:

• 1 7
• 2 0
• 3 14
• 4 1

Rusting of iron needs:

• 1 Nitrogen and water
• 2 Oxygen and water
• 3 Only water
• 4 Only oxygen

The most abundant gas in the Sun is:

• 1 Oxygen
• 2 Hydrogen
• 3 Carbon
• 4 Helium

The gas used by plants in photosynthesis is:

• 1 Hydrogen
• 2 Carbon dioxide
• 3 Nitrogen
• 4 Oxygen

Which of the following is a good conductor of electricity?

• 1 Dry wood
• 2 Copper
• 3 Rubber
• 4 Glass

The chemical symbol of gold is:

• 1 Au
• 2 Gd
• 3 Ag
• 4 Go

The gas used in fire extinguishers is mainly:

• 1 Oxygen
• 2 Nitrogen only
• 3 Carbon dioxide
• 4 Hydrogen

Water is a compound of:

• 1 Oxygen and carbon
• 2 Hydrogen and nitrogen
• 3 Hydrogen and oxygen
• 4 Hydrogen and carbon

The hardest natural substance is:

• 1 Graphite
• 2 Diamond
• 3 Steel
• 4 Quartz

Which gas is released when zinc reacts with dilute sulfuric acid?

• 1 Oxygen
• 2 Hydrogen
• 3 Carbon dioxide
• 4 Chlorine

The main ingredient of LPG is:

• 1 Methane
• 2 Ethanol
• 3 Acetylene
• 4 Propane and butane

The ripening of fruits is hastened by the gas:

• 1 Neon
• 2 Ethylene
• 3 Oxygen
• 4 Methane

Which metal is liquid at room temperature?

• 1 Lead
• 2 Mercury
• 3 Iron
• 4 Sodium

The pH of lemon juice is about:

• 1 13
• 2 7
• 3 10
• 4 2

Soap is made by the reaction of fats with:

• 1 An alkali such as sodium hydroxide
• 2 Salt water only
• 3 Alcohol
• 4 An acid

The compound used to treat acidity in the stomach is:

• 1 Acetic acid
• 2 Sodium chloride
• 3 Magnesium hydroxide
• 4 Hydrochloric acid

Chlorine is used in water mainly to:

• 1 Add minerals
• 2 Remove salt
• 3 Soften it
• 4 Kill germs