Chemical Reactions and Equation-Oxidation Reactions (CBSE Class-10 Science): Questions 1 - 8 of 10

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Question number: 1

» Chemical Reactions and Equation » Oxidation Reactions » Corrosion

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Neha has been collecting silver coins and copper coins. After few days she observed a black coating on silver coins and a green coating on copper coins. Why the coins were coated with black and green coatings? Write the chemical name of black and green coatings.

Question number: 2

» Chemical Reactions and Equation » Oxidation Reactions » Rancidity

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While packing food articles, why do manufacturers flush out oxygen with nitrogen?

Question number: 3

» Chemical Reactions and Equation » Oxidation Reactions » Corrosion

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Why do we need to apply paint on iron articles?

Question number: 4

» Chemical Reactions and Equation » Oxidation Reactions » Corrosion

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Give the name of one metal which does not corrode.

Question number: 5

» Chemical Reactions and Equation » Oxidation Reactions » Corrosion

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What are the requirements for corrosion to occur?

Question number: 6

» Chemical Reactions and Equation » Oxidation Reactions » Rancidity

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What is rancidity of food?

Question number: 7

» Chemical Reactions and Equation » Oxidation Reactions » Rancidity

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What is rancidity?

Question number: 8

» Chemical Reactions and Equation » Oxidation Reactions » Corrosion

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A road tanker carrying an acid met with an accident and its contents spilled on the road. At the side of the road, iron drain covers began melting and fizzing as the acid ran over them. A specialist was called to see if the acid actually leaked into the nearby river.

(a) Explain how the specialist could carry out a test to see if the river water is contaminated with acid.

(b) The word melting is incorrectly used in the report. Suggest a better name that should have been used.

(c) Explain why drain covers began fizzing as the acid ran over them.

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