25 Questions MCQ Test Science Class 10 - Test: Chemical Reactions & Equations
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Which of the following is a decomposition reaction?
Detailed Solution for Test: Chemical Reactions & Equations - Question 5
A decomposition reaction occurs when one reactant breaks down into two or more products. Examples of decomposition reactions include the breakdown of hydrogen peroxide to water and oxygen, and the breakdown of water to hydrogen and oxygen. 2KClO3 → 2KCl + 3O2
A chemical equation is said to be balanced if number of
Detailed Solution for Test: Chemical Reactions & Equations - Question 8
Balanced chemical equation: A balanced equation is a chemical equation in which number of atoms of each element is equal on both sides of the equation i.e number of atoms of an element on reactant side = number of atoms of that element on the product side.
Which statement is correct about the following reaction?
ZnO + CO → Zn + CO2
Detailed Solution for Test: Chemical Reactions & Equations - Question 9
ZnO(s) + CO(s) → Zn(s) + CO2(g)
Since oxygen has combined with carbon, carbon is the one that is oxidized and ZnO is the oxidizing agent. Similarly carbon has taken the oxygen of ZnO, carbon is the reducing agent and ZnO is the one that has been reduced.
So Option C is correct
Test: Chemical Reactions & Equations - Question 10
When Iron nails are added to an aquous solution of copper sulphate, a chemical change occurs, which of the following is NOT true about this reaction?
Detailed Solution for Test: Chemical Reactions & Equations - Question 16
Fe(s) + CuSO4 ⟶ Cu(s) + FeSO4
When an iron nail is dipped in copper sulphate solution, a brown coating of copper is formed on the surface of iron and the colour of copper sulphate solution changes from blue to light green. This reaction shows that iron is more reactive than copper as it displaces copper from its solution and iron passes into solution as Fe2+ ions and ferrous sulphate solution is formed.
So Option D is correct
Test: Chemical Reactions & Equations - Question 17
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