Chemical Equations and Reactions
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Question 1 of 6
1. Question
Which of the following are the observations of the chemical reaction?
1. Change in state
2. Evolution of a gas
3. Change in colour
4. Change in temperatureCorrectIncorrect -
Question 2 of 6
2. Question
Which of the following are correctly matched?
1. Reactant ——————————————- substance which undergoes change.
2. Product ———————————————————————- new substance.
3. Chemical reaction ———————————————————- simplest form.CorrectIncorrect -
Question 3 of 6
3. Question
Which of the following is/are correct for a balanced chemical equation?
1. It is based on law of conservation of mass.
2. The physical state makes the chemical reaction less informative.CorrectIncorrect -
Question 4 of 6
4. Question
Which of the following are correctly matched?
Symbol state
1. aq soluble in alcohol
2. I liquid
3. s solidCorrectIncorrect -
Question 5 of 6
5. Question
Which of the following are correctly matched?
1. Combination reaction ———————————— formation of single product.
2. Decomposition reaction ———————————- break down of single entity.
3. Thermal decomposition —————————————————– heat is used.
4. Displacement reactlon ————————————– based on reactivity series.CorrectIncorrect -
Question 6 of 6
6. Question
Which of the statements about the reaction below are incorrect?
2PbO(s) + C(s) + 2Pb(s) + CO2(g)
1. Lead is getting reduced.
2. Carbon dioxide is getting oxidised.
3. Carbon is getting oxidised.
4. Lead oxide is getting reduced.CorrectIncorrect