chemistry

ICSE 10 Chemistry Competency Focused Practice Questions Solution- Long Answer Questions

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ICSE 10 Chemistry Competency Focused Practice Questions Solution: IX. Long Answer Questions Question 108. [Metallurgy]With respect to the Hall Heroult process related to the extraction of aluminium, justifythe following:(a) Powdered Coke is sprinkled over the electrolytic mixture undergoing electrolyticreduction.(b) Graphite anodes are continuously replaced during the electrolysis.(c) Cryolite and fluorspar must be added to the … Read more

ICSE 10 Chemistry Competency Focused Practice Questions Solution- Short Answer Questions

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ICSE 10 Chemistry Competency Focused Practice Questions Solution VIII. Short Answer Questions Question 91. [Study of Acids, Bases and Salts]Some general rules for the solubility of salts in water are listed. Answer: (c) silver nitrate and zinc chlorideSilver chloride is formed, which is an insoluble precipitate, while for all others, noprecipitate is formed 2AgNo3 + … Read more

ICSE Chemistry Competency Focused Practice Questions Solution- Very Short Answer Questions

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ICSE Chemistry Competency Focused Practice Questions Solution- VII. Very Short Answer Questions Question 84. [Analytical Chemistry]Calcium hydroxide solution is used to detect the presence of carbon dioxide gas, whilesodium hydroxide is NOT. Justify. Answer: Carbon dioxide gas reacts with calcium hydroxide to form a white precipitate of calcium carbonate. In reaction with sodium hydroxide, the … Read more

ICSE Class 10 Chemistry Competency Focused Practice Questions Solution-IUPAC Names

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ICSE Class 10 Chemistry Competency Focused Practice Questions Solution VI. IUPAC Names Question 77. [Organic Chemistry] Give the IUPAC name of the following organic compounds: Answer: 2- methyl but-1-ene Question 78. [Organic Chemistry] Answer: 3- bromo butanoic acid Question 79. [Organic Chemistry] Answer: 2- methyl propan-2- ol Question 80. [Organic Chemistry] Answer: 2- methyl propanol … Read more

ICSE Class 10 Chemistry Competency Focused Practice Questions Solution-Structural diagram

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ICSE Class 10 Chemistry Competency Focused Practice Questions Solution: V. Structural diagram: (1 Mark each) Question 69. [Organic Chemistry]Draw the structural diagram of the product obtained when ethene reacts with chlorine. Answer: Explanation: When ethene reacts with chlorine, the product formed is 1,2-dichloro ethane. CH2 = CH2 + Cl2 → ClCH2 – CH2Cl Question 70. … Read more

ICSE Class 10 Chemistry Competency Focused Practice Questions Solution-One Word Answer

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ICSE Class 10 Chemistry Competency Focused Practice Questions Solution IV. One Word Answer: (1 Mark each) Question 59. [Analytical Chemistry] Name a positive non-metallic radical which is basic in nature. Answer: Ammonium (NH4+) Explanation: In ammonia the two electrons remaining on the nitrogen atom form a bond with the hydrogen ion. This bond that is … Read more

ICSE Class 10 Chemistry Competency Focused Practice Questions Solution-Match the Following

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ICSE Class 10 Chemistry Competency Focused Practice Questions Solution III. Match the Following Question 50. [Periodic Properties and Variations of Properties] Column A Column B (a) Alkali metals (i) Be, C, O, F (b) Alkaline earth metals (ii) F, Cl, Br, I (c) Atomic radius decreases (iii) P, Al, Na, S (d) Non-metallic character decreases … Read more

ICSE Class 10 Chemistry Competency Focused Practice Questions Solution-Fill in the Blanks

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ICSE Class 10 Chemistry Competency Focused Practice Questions Solution II. Fill in the Blanks (1 mark each) Question 39. [Mole Concept and Stoichiometry]Fill in the blanks by choosing the correct options given in the brackets: An aqueous solution of gas X turns red litmus blue, so it must contain (i)_______________(hydrogen/ hydroxyl) ions. When this solution … Read more

ICSE Class 10 Chemistry Competency Focused Practice Questions Solution-Multiple Choice Questions

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ICSE Class 10 Chemistry Competency Focused Practice Questions Solution I. Multiple Choice Questions (1 mark each) Question 1. [Analytical Chemistry] Ravi was asked to identify the cation present in the salt solution. He added one of the reagents given below and got a reddish-brown precipitate. The reagent that he used is: (a) Silver nitrate solution(b) … Read more