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Question
Give two examples for the following case:
Chemical changes
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Solution
- Burning of paper
- Curdling of milk
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MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Reduction is a chemical reaction in which there is
- removal of hydrogen
- removal of oxygen
- addition of oxygen
- none of these
What are chemical reactions?
Explain the following reaction with one suitable example of Combination reactions .
Name the type of chemical reaction shown by the following equation:
2Mg + O2 → 2MgO
Match the pairs.
| a. | Photosynthesis | i. | Tendency to lose electrons |
| b. | Water | ii. | Reactant in combustion process |
| c. | Sodium chloride | iii. | Chemical change |
| d. | Dissolution of salt in water | iv. | Covalent bond |
| e. | Carbon | v. | Ionic bond |
| f. | Fluorine | vi. | Physical change |
| g. | Magnesium | vii. | Tendency to form anion |
Give an example of a reaction where the following are involved
Catalyst
Complete and balance the following reaction:
NaCl(aq) + AgNO3(aq) →
Give balanced equation for the following conversion affected by heat alone on the substance:
Zinc carbonate to zinc oxide
State the following reaction represent oxidation or reduction.
\[\ce{Cu++->Cu}\]
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Lead nitrate.
