Write the balanced chemical equations for the chemical reaction; sodium sulphate reacts with barium chloride. How can we confirm by the observation that these chemical reaction is taking place?

When the solution of barium chloride with sodium sulphate, a white precipitate of barium sulphate is immediately formed. We can confirm the chemical reaction by observing the precipitate formation. The balanced chemical reaction is as follows: BaCl 2 aq + Na 2 SO 4 aq → BaSO 4 s ↓ + 2 NaCl aq

Manufacture of chips, flush the packets of chips with nitrogen gas. Why?

Manufacture of chips, flush the packets of chips with nitrogen gas because nitrogen is an antioxidant. It prevents the chips from being oxidised. If the nitrogen is not flushed in the packets, the chips react with oxygen and become rancid and the smell and taste of food change.

The chemical reaction does not take place when copper is added to the iron sulphate solution. Give reason.

The chemical reaction does not take place when copper is added to the iron sulphate solution because copper is less reactive than iron. Copper is less reactive than iron, is placed at the bottom of the reactivity series below the iron.

E M B I B E

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 1 - Chemical Reactions and Equations>Karnataka Board-2020>Q 9

MEDIUM

10th Karnataka Board

IMPORTANT

Earn 100

Draw the diagram of the arrangement of apparatus showing the reaction of zinc granules with dilute sulphuric acid and testing hydrogen gas by burning and labelling the zinc granules.

Important Questions on Chemical Reactions and Equations

MEDIUM

10th Karnataka Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 1 - Chemical Reactions and Equations>Karnataka Board-2019>Q 2

Name the brown fumes liberated when lead nitrate is heated. Write the balanced chemical equation for this reaction.

MEDIUM

10th Karnataka Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 1 - Chemical Reactions and Equations>Karnataka Board-2019>Q 5

Silver articles when exposed to the air gradually turn blackish. Give reason.

MEDIUM

10th Karnataka Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 1 - Chemical Reactions and Equations>Karnataka Board-2019>Q 7

Copper loses its brown layer gradually when exposed to air. Give reason.

HARD

10th Karnataka Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 1 - Chemical Reactions and Equations>Karnataka Board-2020>Q 10

Strips of zinc, iron, magnesium and copper are taken in the test tubes A, B, C and D respectively. The same quantity of ferrous sulphate solution is added to these test tubes. In which test tubes chemical reaction will occur? Why? Write the chemical equations for the reactions taking place here.

HARD

10th Karnataka Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 1 - Chemical Reactions and Equations>Karnataka Board-2020>Q 11

Write the balanced chemical equations for the chemical reaction; lead nitrate is heated. How can we confirm by the observation that these chemical reaction is taking place?

MEDIUM

10th Karnataka Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 1 - Chemical Reactions and Equations>Karnataka Board-2018>Q 14

State Boyle's law. Write the mathematical form of Boyle's law. Give an example of this law.

MEDIUM

10th Karnataka Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 1 - Chemical Reactions and Equations>Karnataka Board-2019>Q 1

The chemical equation that represents neutralisation reaction among the following is