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

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.

The strips of zinc, iron, magnesium and copper are taken in test tubes A, B, C and D, respectively. The same quantity of ferrous sulphate solution is added to these test tubes. In test-tube A and C reaction will occur. Zinc and magnesium are more reactive than iron. Iron and copper will not react with ferrous sulphate because they are less reactive than iron. When zinc strip is introduced to ferrous sulphate solution because zinc is more reactive than iron, it displaces iron from its iron sulphate solution and forms a grey precipitate of iron and a colourless zinc sulphate solution. And when the magnesium strip is introduced to ferrous sulphate solution, the magnesium pushes the iron out of the iron(II) sulphate. Solid iron and a solution of magnesium sulphate are made. The chemical equations for the reactions are as follows: Zn + FeSO 4 → ZnSO 4 + Fe Mg + FeSO 4 → MgSO 4 + Fe In this reaction, the one wherein the atom or a set of atoms is displaced by another atom in a molecule.

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.

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

Copper loses its brown layer gradually when exposed to air because copper reacts with atmospheric gases to form a mixture of copper metal. It reacts with moist carbon dioxide in the atmosphere and slowly loses its shiny brown surface and gains a green coat due to the corrosion.

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 3

Draw the diagram of the arrangement of apparatus used to show the reaction of zinc granules with dilute sulphuric acid and testing hydrogen gas by burning. Label the soap solution.

MEDIUM

10th Karnataka Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 1 - Chemical Reactions and Equations>Karnataka Board-2019>Q 4

Draw the diagram of the arrangement of apparatus used to show the reaction of zinc granules with dilute sulphuric acid and testing hydrogen gas by burning. Label the delivery tube.

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.

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