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Chemical Tests for Identifying Gases Quiz

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Chemical Tests for Identifying Gases Quiz

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Questions and Answers

What happens when a burning splinter is brought in contact with hydrogen gas?

The burning splinter extinguishes with a pop sound.

How is oxygen gas confirmed in a chemical reaction?

A glowing splinter will glow more brightly.

What gas is suspected when a colourless and odourless gas evolves with brisk effervescence upon adding metallic carbonate to dilute hydrochloric acid?

Carbon dioxide

What is the product of the chemical reaction between Zn and dilute HCl?

ZnCl2 + H2 Signup and view all the answers

What chemical reaction confirms the presence of ammonia?

NH4Cl + NaOH -> NaCl + H2O + NH3 Signup and view all the answers

How is the presence of ammonium salt and alkali confirmed?

2NH4Cl + Ca(OH)2 -> CaCl2 + 2H2O + 2NH3 Signup and view all the answers

What happens when moist blue litmus paper is brought in contact with an acidic gas?

The paper first turns red and finally bleaches it to white. Signup and view all the answers

How can the presence of chlorine (Cl2) be suspected?

When oxidizing agents are heated, a greenish yellow colored gas with a pungent smell is evolved. Signup and view all the answers

What happens when a few marble chips are added to a test tube containing dilute hydrochloric acid?

Effervescence of a gas is observed, confirming the presence of carbon dioxide. Signup and view all the answers

How can you confirm the presence of carbon dioxide gas evolved in a chemical reaction?

Pass the evolved gas through lime water and observe the milkiness in the lime water. Signup and view all the answers

Describe a test to identify the presence of sulphur dioxide gas.

Pass the evolved gas through acidified potassium dichromate solution and observe the green color change. Signup and view all the answers

What is the chemical reaction involved in confirming the presence of sulphur dioxide using dilute sulfuric acid?

When dilute sulfuric acid is added to sodium bisulphite, sulphur dioxide gas is evolved. Signup and view all the answers