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Virat
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Study the figure given below and answer the following questions: (A) Name the process depicted in the diagram. (B) Write the composition of gases collected at anode and the cathode. (C) Write the balanced chemical equation of the reaction taking place in this case. (D) The reaction does not take place if a few drops of dilute sulphuric acid are not added to water. Why?

(A) Electrolytic decomposition of water/electrolysis of water. (B) The gas collected at cathode is hydrogen which is double the volume of oxygen collected at anode. sample paper for class 10 science board exam 2026 CBSE Sample Paper Class 10 Science 2025-26

cbse sample paper class 10 science 2025-26class 10 science half yearly paperfigure given below and answer the following questions
Virat
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Rakvi performed an activity by taking ethanoic acid and sodium hydrogen carbonate as shown in the diagram given below. The diagram shows an experimental setup where ethanol is oxidised to ethanoic acid using an oxidizing agent, producing CO2 gas sodium bicarbonate (NaHCO3) may be used to test the acidic nature of the product. Answer the following questions based on the given information: (i) What is the observable change when CO2 gas reacts with lime water in the in this experiment? (ii) Rakvi observed that a salt X is formed with the evolution of gas Y. Identify the salt X and evolved gas Y. (iii) Write the chemical equation of the reaction involved.

Lime water turns milky because carbon dioxide gas reacts with calcium hydroxide solution to form calcium carbonate. When ethanoic acid reacts with sodium hydrogen carbonate, the products formed are sodium ethanoate (X), water, and carbon dioxide gas (Y). cbse class 10 ...

class 10 science half yearly paperobservable change when co2 gas reacts with lime watersample paper for class 10 science board exam 2026
Virat
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Observe the following diagram showing the conditions under which a metal ‘M’ corrodes. List your observations in each of the three cases A, B and C with the reason, if the metal ‘M’ is generally protected against corrosion by the method of galvanisation.

Case A: Significant corrosion will be observed on the metal surface because the protective zinc coating on the metal readily react with oxygen and the moisture present in the moist air. class 10 free sample paper for 2026 board exam class 10 ...

class 10 free sample paper for 2026 board examclass 10 science half yearly paperclass 10 science half yearly paper on tiwari academydiagram showing the conditions under which a metal
Virat
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Study the diagram given below and answer the questions: (i) Name the defect of vision represented in the diagram. (ii) Redraw the diagram and show how a corrective lens resolves this defect? Label the lens type and focal point.

Myopia (nearsightedness) — image forms in front of the retina because the eye’s lens is too strong (focal length too short) or the eyeball is too long. class 10 free sample paper for 2026 board exam class 10 science half yearly paper ...

class 10 free sample paper for 2026 board examclass 10 science half yearly paperdiagram given belowhow a corrective lens resolves this defect
Virat
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The electronic configuration of elements X (2, 4) and Y (2, 8, 1) is given. Based on the information given above, answer the following questions: (a) Which type of bond is formed between X and Y? Explain with reason. (b) How many valence electrons take part in the bond formation between X and Y? Explain. (c) Give the chemical formula of the compound. (d) State one physical property of this compound based on the type of bonding. (e) Write the chemical equation for the reaction of Y with ethanoic acid.

The bond formed between X and Y is a covalent bond, because element X (carbon) shares its valence electrons with element Y (hydrogen – like or sodium) to achieve a stable configuration. Download cbse sample paper for class 10 science class 10 ...

class 10 free sample paper for 2026 board examclass 10 science half yearly paperclass 10 science half yearly paper on tiwari academy
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