Chemical Reactions and Equations
Class 10 · Science · 26 Questions
Why should a magnesium ribbon be cleaned before burning in air?
Write the balanced equation for the following chemical reactions.
Write a balanced chemical equation with state symbols for the following reactions.
A solution of a substance 'X' is used for whitewashing.
Why is the amount of gas collected in one of the test tubes in Activity 1.7 double of the amount collected in the other? Name this gas.
Why does the colour of copper sulphate solution change when an iron nail is dipped in it?
Give an example of a double displacement reaction other than the one given in Activity 1.10.
Identify the substances that are oxidised and the substances that are reduced in the following reactions.
Fe2O3 + 2Al → Al2O3 + 2Fe The above reaction is an example of a
What happens when dilute hydrochloric acid is added to iron fillings? Tick the correct answer.
What is a balanced chemical equation? Why should chemical equations be balanced?
Translate the following statements into chemical equations and then balance them.
Balance the following chemical equations.
Write the balanced chemical equations for the following reactions.
Write the balanced chemical equation for the following and identify the type of reaction in each case.
What does one mean by exothermic and endothermic reactions? Give examples.
Why is respiration considered an exothermic reaction? Explain.
Why are decomposition reactions called the opposite of combination reactions? Write equations for these reactions.
What is the difference between displacement and double displacement reactions? Write equations for these reactions.
In the refining of silver, the recovery of silver from silver nitrate solution involved displacement by copper metal. Write down the reaction involved.