Day 49: CBSE Class 10 Science
5 questions (8 parts). Try each one first, then open its answer.
Question 1
Carbon and its Compounds. This type asked 3 times: 2023, 2025, 2026. This one: 2026
29 (a)A carbon compound ‘P’ of molecular formula is found to be neutral when tested with red and blue litmus. A gas that burns with a pop sound is produced when sodium metal reacts with compound ‘P’. (i) Identify the compound ‘P’. (ii) The carbon compound ‘P’ is heated with conc. at 443 K to produce compound ‘Q’. (I) Write the chemical equation for the reaction. (II) What is the role of conc. in this reaction ? (iii) What is likely to be observed on heating compound ‘P’ with ethanoic acid with an acid as a catalyst ? Write the chemical equation for the reaction.Question 2
Carbon and its Compounds. This type asked 3 times: 2024, 2025, 2026. This one: 2026
18Which of the following set of compounds does not belong to same homologous series ?Tap an option to check your answer.
Question 3
Carbon and its Compounds. This type asked 3 times: 2023, 2025, 2026. This one: 2026
20Consider the structures ‘X’ and ‘Y’ given below : Which of the following statements are correct ? (i) ‘X’ and ‘Y’ are homologues. (ii) ‘X’ and ‘Y’ have the same structural formula, but different molecular formula. (iii) ‘X’ and ‘Y’ have the same molecular formula, but different structural formula. (iv) ‘X’ and ‘Y’ are structural isomers.Tap an option to check your answer.
Question 4
Carbon and its Compounds. This type asked 3 times: 2023, 2025, 2026. This one: 2026
20While washing dirty clothes by soap, micelles are formed. Select the correct statement about micelles.Tap an option to check your answer.
Question 5 (case study, 4 parts)
Carbon and its Compounds. This type asked 3 times: 2024, 2025, 2026. This one: 2026
Alcohol forms a homologous series with general formula –OH and –OH group as functional group. Ethanol is commonly called alcohol and is used in alcoholic drinks. It is good solvent, used in medicines, cough syrups, tonics etc.28 (a)Write structural formula and name of 4th member of alcohol homologous series.28 (b)What happens when ethanol is heated with alkaline ? Write chemical equation involved.28 (c)Write the chemical equation of reaction of ethanol with ethanoic acid in the presence of concentrated . Write the name of this reaction.28 (c) ORWhat happens when ethanol is heated with excess concentrated sulphuric acid at 443 K ? Write chemical equation involved. What is the role of concentrated sulphuric acid in this reaction ?