The chemical equation that represents neutralisation reaction among the following is

2 NaOH + H 2 SO 4 → Na 2 SO 4 + 2 H 2 O

BaCl 2 + H 2 SO 4 → BaSO 4 + 2 HCl

MnO 2 + 4 HCl → MnCl 2 + 2 H 2 O + Cl 2

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

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?

When lead nitrate is heated, it decomposes to form lead oxide, nitrogen dioxide and oxygen. We can confirm the reaction take place by the observation, i.e. a reddish-brown coloured nitrogen dioxide is evolved in this reaction. The balanced chemical equation for the chemical reaction is as follows: 2 Pb NO 3 2 → Heat 2 PbO + 4 NO 2 + O 2

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

Boyle's law relates the pressure and volume of an ideal gas. It states that at a fixed temperature, the volume of gas is inversely proportional to the pressure exerted by the gas. The mathematical expression of Boyle's law can be written as: PV = k , where P is the pressure of the gas, V is the volume of the gas and k is a constant. An example of Boyle's law can be seen in a balloon. When air is blown into the balloon, the pressure of that air pushes the balloon to expand. If one end of the balloon is squeezed, making the volume smaller, the pressure inside increases, making the un-squeezed part of the balloon expand out. Thus, the volume of the gas is inversely proportional to the pressure exerted by the gas.

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10th Karnataka Board

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

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 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.

MEDIUM

10th Karnataka Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 1 - Chemical Reactions and Equations>Karnataka Board-2019>Q 6

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

MEDIUM

10th Karnataka Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 1 - Chemical Reactions and Equations>Karnataka Board-2020>Q 8

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

MEDIUM

10th Karnataka Board

IMPORTANT

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

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.

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.

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

Important Questions on Chemical Reactions and Equations

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