Acids, Bases and Salts - Class 7 - Science
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Extra Questions - Acids, Bases and Salts | Lakhmir Singh | Science | Class 7
Litmus, a natural dye, is an extract of which of the following?
A. China rose
B. Beetroot
C. Lichen
D. Blueberries
The correct answer is Option C: Lichen.
Lichen is the source of the natural dye known as litmus. Litmus is widely used as an acid-base indicator in chemical experiments. When added to an acidic solution, litmus turns red, while it turns blue in a basic solution.
Very Short Answers - Acids, Bases and Salts | Lakhmir Singh | Science | Class 7
Name one natural indicator and one synthetic indicator.
One natural indicator is litmus, which is derived from lichens, and a commonly used synthetic indicator is phenolphthalein.
Name the acid-base indicator extracted from lichens.
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Sign up nowName any two gaseous pollutants which cause acid rain.
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Sign up now(a) Name two organic acids (naturally occurring acids).
(b) Name two mineral acids.
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Sign up nowShort Questions - Acids, Bases and Salts | Lakhmir Singh | Science | Class 7
What is an indicator? Name three indicators.
An indicator is a substance that changes colour when added to an acidic or basic solution, indicating its pH. Three indicators include litmus, which turns red in acid and blue in base; turmeric, which changes colour with bases; and China rose, altering colour differently with acids and bases.
Name the source from which litmus solution is obtained. What is the use of this solution?
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Sign up nowExplain why, an antacid tablet is taken when you suffer from acidity.
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Sign up nowA shopkeeper has a few bottles of soft drinks in his restaurant which are not labelled. One customer wants acidic drink, another wants basic drink and the third one wants neutral drink. How will the shopkeeper decide which drink is to be served to whom?
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Sign up nowLong Questions - Acids, Bases and Salts | Lakhmir Singh | Science | Class 7
What is meant by acid rain? How is acid rain caused? What damage is caused by acid rain?
Acid rain refers to rainwater that has an increased acidity level, typically due to the presence of sulfuric and nitric acids. It is primarily caused by the release of sulfur dioxide (SO2) and nitrogen oxides (NOx) into the atmosphere. These pollutants come from the burning of fossil fuels in power plants, automobiles, and industrial processes. When these gases react with water vapor in the atmosphere, they form sulfuric and nitric acids, which then fall to the earth as acid rain. This phenomenon can cause significant damage to buildings, historical monuments, and can adversely affect plant and aquatic life, disrupting ecosystems. It can also lead to the acidification of soil and water bodies, making the environment hostile for many living organisms.
What are neutral salts, acidic salts and basic salts. Give two examples each of neutral, acidic and basic salts.
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Sign up nowMCQ - Acids, Bases and Salts | Lakhmir Singh | Science | Class 7
Which of the following type of medicine is used for treating indigestion caused by overeating?
(a) antibiotic
(b) analgesic
(c) antacid
(d) antiseptic
The correct answer is (c) antacid.
Indigestion caused by overeating is often due to too much acid being produced in the stomach. Antacids are medicines that neutralize the excess stomach acid and relieve symptoms of indigestion.
- (a) Antibiotics are used to treat bacterial infections.
- (b) Analgesics are pain relievers.
- (d) Antiseptics are used to prevent the growth of bacteria on the external surfaces of the body and to prevent infections.
One of the following is not an organic acid. This is :
(a) acetic acid
(b) formic acid
(c) citric acid
(d) carbonic acid
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Sign up nowThe aqueous solution of one of the following will turn China rose indicator from light pink to green. This solution is of :
(a) vinegar
(b) baking soda
(c) lemon juice
(d) carbonic acid
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Sign up nowThe two indicators which give red or pink colour on adding a basic solution are :
A. China rose indicator
B. Turmeric paper indicator
C. Phenolphthalein indicator
D. Blue litmus indicator
(a) A and B
(b) B and C
(c) C and D
(d) A and D
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Sign up nowHOTS - Acids, Bases and Salts | Lakhmir Singh | Science | Class 7
Consider the following salts : Sodium sulphate, Sodium carbonate, Ammonium sulphate The aqueous solution of which of these salts will :
(a) turn blue litmus to red?
(b) turn phenolphthalein to pink?
(c) turn China rose indicator to green?
(d) have no effect on any indicator? Give reasons for your answer in each case.
(a) Ammonium sulphate will turn blue litmus to red because it is an acidic salt formed by the reaction of a strong acid (sulfuric acid) and a weak base (ammonium hydroxide), resulting in an acidic solution.
(b) Sodium carbonate will turn phenolphthalein to pink as it is a basic salt formed by the reaction of a strong base (sodium hydroxide) and a weak acid (carbonic acid), giving a basic solution that makes phenolphthalein turn pink.
(c) Sodium carbonate solution will also turn China rose indicator to green, indicating its basic nature.
(d) Sodium sulphate will have no noticeable effect on any indicator since it's formed by the reaction of a strong acid (sulfuric acid) and a strong base (sodium hydroxide), resulting in a neutral solution.
Blue litmus paper is dipped in a solution. It remains blue. What is the nature of the solution? Explain.
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