Olympiad Test: Acids Bases & Salts - Grade 6 MCQ

Substances that taste sour and are corrosive in nature are called acids. The chemical nature of such substances is known as acidic.

Phenolphthalein is a synthetic indicator commonly used in laboratories to test the acidic or basic nature of a substance. It changes color based on the pH of the solution.

Red litmus paper turns blue when dipped in a basic solution, indicating the basic nature of the substance.

Sodium hydroxide is a strong base and highly corrosive in nature.

Sour things contain acids. All organic acid obtained from plants and animals are sour in taste. Mineral acids should not be tasted.

Common salt formed during the neutralization of sodium hydroxide and hydrochloric acid is chemically known as Sodium Chloride.

In the neutralization reaction between hydrochloric acid and sodium hydroxide, water is formed along with the salt (sodium chloride).

Neutralization reactions are exothermic because they release heat during the formation of the neutral solution.

Turmeric strains on clothes turn into red when washed with soap. Soap is basic in nature and reacts with turmeric to give red colour in presence of water.

Milk of magnesia, being a base, neutralizes excess hydrochloric acid in the stomach, providing relief from indigestion.

The reaction of an acid with a base is called a neutralization reaction. The products of this reaction are a salt and water.

Indicators are substances that give different colour with acid and base. Litmus, turmeric and rose petals are natural indicators while phenolphthalein is a artificial indicator.

Vitamin C is also known as ascorbic acid. It is a water-soluble vitamin that is necessary for normal growth and development. It is an antioxidant that helps maintain skin, blood vessels, bones and cartilage. It's also known to boost your immune system.

Tartaric acid, Citric acid, and Acetic acid are different types of acids and are not associated with Vitamin C. Tartaric acid is commonly found in grapes and bananas, Citric acid is naturally present in citrus fruits, and Acetic acid is a key component in vinegar.

The correct answer is Ascorbic acid.

Acidic soil is treated with bases like slaked lime (calcium hydroxide) to neutralize its acidic nature.

Bases are used to neutralize acidic wastes in factories before disposal, preventing harm to aquatic organisms.

The word acid comes from Latin word acere which means Sour. Acids are sour in taste.

Baking soda, being a base, neutralizes the formic acid injected by ants or bees, providing relief from the pain of the sting.

Litmus is extracted from Lichens and comes in the form of strips of two colors - blue litmus paper and red litmus paper.

Formic acid is found in bites of strings of insect which cause burning sensation at the site of bite.

Turmeric paper turns Red when dipped into a basic solution, indicating the basic nature of the substance.