Chemical reactions and equations — Practice Quiz
Maharashtra Board · Class 10 · Science
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What is a chemical reaction?
Which symbol is used to indicate that heat is supplied from outside in a chemical equation?
What type of reaction is 2Mg + O₂ → 2MgO?
What is the balanced form of the equation: NaOH + H₂SO₄ → Na₂SO₄ + H₂O?
Sample Questions
In the equation CuSO₄ + Zn → ZnSO₄ + Cu, identify the reactants.
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CuSO₄, Zn
Reactants are substances that take part in a reaction and are written on the left side of the equation. Products (ZnSO₄ and Cu) are formed and written on the right side.
Which physical states can be indicated in chemical equations?
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Solid (s), Liquid (l), Gas (g), Aqueous (aq)
The four common physical states indicated in chemical equations are solid (s), liquid (l), gas (g), and aqueous solution (aq). Plasma state is not commonly used in basic chemistry equations.
AgNO₃ + NaCl → AgCl + NaNO₃ is an example of which type of reaction?
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Double displacement reaction
This is a double displacement reaction because ions exchange between reactants - Ag⁺ from AgNO₃ combines with Cl⁻ from NaCl, while Na⁺ from NaCl combines with NO₃⁻ from AgNO₃.
Which factors affect the rate of chemical reactions?
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Temperature, Particle size, Concentration, Catalyst
Temperature, particle size, concentration of reactants, and presence of catalyst all affect reaction rates. Higher temperature and concentration, smaller particle size, and catalysts generally increase reaction rates.
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