Every question from this NCERT chapter, with a detailed explanation.
With reference to the chemical nature of substances, consider the following statements: 1. All substances that taste sour contain acids. 2. Substances that taste bitter and feel soapy on touching are generally acidic in nature. 3. Baking soda is an example of a substance that has a bitter taste and is basic in chemical nature. Which of the statements given above is/are correct?
Consider the following statements regarding naturally occurring acids: 1. Lactic acid is the primary constituent of vinegar. 2. Oxalic acid is found in spinach. 3. Ascorbic acid is also known as Vitamin C. Which of the statements given above is/are correct?
Which one of the following pairs is correctly matched regarding the acid present in the substance?
With reference to bases and their sources, consider the following pairs: 1. Calcium hydroxide : Lime water 2. Ammonium hydroxide : Window cleaner 3. Magnesium hydroxide : Soap 4. Sodium hydroxide : Milk of magnesia How many of the above pairs are correctly matched?
Consider the following statements about 'Litmus', a natural indicator: 1. It is extracted from lichens. 2. It has a green colour in distilled water. 3. It turns blue when added to an acidic solution. Which of the statements given above is/are correct?
With reference to Turmeric as an indicator, consider the following statements: 1. Turmeric paste remains yellow in acidic solutions. 2. Turmeric paste turns blue in basic solutions. 3. Soap solution applied to a turmeric stain turns it red. Which of the statements given above is/are correct?
Consider the following statements regarding the China rose indicator: 1. It is prepared by keeping China rose petals in ice-cold water. 2. It turns acidic solutions to dark pink (magenta). 3. It turns basic solutions to green. Which of the statements given above is/are correct?
Consider the following statements regarding the effect of indicators on common substances: 1. Lemon juice turns red litmus blue. 2. Soap solution turns red litmus blue. 3. Milk of magnesia turns turmeric paper blue. Which of the statements given above is/are correct?
Which of the following best explains why dry baking soda does not change the colour of dry litmus paper?
Consider three liquids: Hydrochloric acid, Sodium hydroxide, and Sugar solution. If tested with a turmeric indicator, which one of the following observations is correct?
With reference to the indicator Phenolphthalein, consider the following statements: 1. It is a synthetic indicator. 2. It turns red in an acidic solution. 3. It gives a pink colour in a basic solution. Which of the statements given above is/are correct?
With reference to the product 'salt' formed in a neutralization reaction, which of the following statements is correct?
When dilute sulphuric acid is added to lime water, the reaction mixture becomes hot. Which of the following best explains this phenomenon?
With reference to soil treatment, consider the following statements: 1. Plants grow best when the soil is highly acidic. 2. If the soil is too acidic, it is treated with bases like quick lime or slaked lime. 3. If the soil is basic, organic matter is added to release acids. Which of the statements given above is/are correct?
What is the primary objective of treating factory waste with basic substances before discharging it into water bodies?
Which one of the following pairs is correctly matched regarding the chemical name and common name/use?
With reference to 'Acid Rain', consider the following statements: 1. It is caused by the dissolution of pollutants like carbon dioxide, sulphur dioxide, and nitrogen dioxide in rain drops. 2. It contains acetic acid, citric acid, and tartaric acid. 3. It is beneficial for the growth of historical monuments. Which of the statements given above is/are correct?
Which of the following gases is NOT considered a primary contributor to the phenomenon of acid rain?
Consider the following statements regarding acids in the human body: 1. Deoxyribonucleic acid (DNA) controls features like eye colour and height. 2. Proteins are made of fatty acids. 3. Fats in the body contain fatty acids. Which of the statements given above is/are correct?
Match List I with List II and select the correct answer using the code given below: List I | List II A. Lemon juice | 1. Strongly acidic B. Curd | 2. Weakly acidic C. Common Salt | 3. Neutral D. Lime water | 4. Basic
Consider the following statements: 1. All acids are bitter to taste. 2. Bases that are soluble in water are called alkalis. 3. Indicators are substances that change colour in acidic and basic solutions. Which of the statements given above is/are correct?
Common window cleaning solutions contain ammonium hydroxide. Which of the following indicator changes confirms the nature of this solution?
Consider the following statements about 'Organic Matter' used in soil treatment: 1. It is added to acidic soil to neutralize it. 2. It releases acids which neutralize the basic nature of the soil. Which of the statements given above is/are correct?
Which one of the following acids is primarily responsible for the sour taste of unripe mangoes?
With reference to the use of Calamine solution, consider the following statements: 1. It is used to treat skin irritation caused by ant bites. 2. It contains Calcium carbonate. 3. It is applied on the skin to neutralize the effect of wasp stings. Which of the statements given above is/are correct?
Match List I with List II and select the correct answer using the code given below: List I | List II A. Lactic acid | 1. Spinach B. Oxalic acid | 2. Citrus fruits C. Citric acid | 3. Curd D. Formic acid | 4. Ant's sting
Consider the following statements about 'Quick Lime': 1. Its chemical name is Calcium Oxide. 2. It is used to treat basic soil. 3. It is a base. Which of the statements given above is/are correct?
Consider the following statements regarding the preparation of indicators: 1. Litmus is obtained from a plant called Pitcher plant. 2. Turmeric paper is made by depositing turmeric paste on blotting paper. 3. China rose indicator is prepared by keeping petals in warm water. Which of the statements given above is/are correct?
Consider the following statements: 1. Rain containing excess of bases is called acid rain. 2. Acid rain affects plants and animals adversely. 3. Pollutants like Sulphur dioxide dissolve in rain drops to form Hydrochloric acid. Which of the statements given above is/are correct?
Which of the following pairs is correctly matched? Substance | Acid/Base Present 1. Lime water | Calcium hydroxide 2. Soap | Sodium hydroxide 3. Milk of Magnesia | Magnesium hydroxide 4. Window cleaner | Ammonium hydroxide
Consider the following statements about the effect of bases on turmeric: 1. Bases turn turmeric paste red. 2. Acids turn turmeric paste blue. 3. Neutral substances do not change the colour of turmeric. Which of the statements given above is/are correct?
Which of the following statements best explains why a turmeric stain on a white shirt turns red when washed with soap?
Consider the following statements regarding 'Slaked Lime': 1. It is chemically known as Calcium Carbonate. 2. It is used to treat acidic soil. 3. It is a basic substance. Which of the statements given above is/are correct?
Consider the following statements regarding the neutralization of soil: 1. Excessive use of chemical fertilizers makes the soil acidic. 2. Quick lime is used to treat basic soil. 3. Organic matter is used to treat acidic soil. Which of the statements given above is/are correct?
Consider the following statements: 1. Salts can be acidic, basic, or neutral in nature. 2. Neutralization results in the formation of salt and hydrogen gas. 3. A substance that turns red litmus blue is basic. Which of the statements given above is/are correct?
What is the primary function of adding organic matter during soil treatment?
With reference to the chemical nature of Amla (Indian Gooseberry), which of the following statements is correct?