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Question
Write true or false :
No new substance is formed during a chemical reaction.
Options
True
False
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Solution
False
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The chemical name of baking soda is ______.
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
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Positively charged ions are called ........
Fill in the blank:
During a chemical reaction transfer of ________ takes place.
Write balanced chemical equations for the reactions represented by word equations in the conditions for chemical reaction.
| Reactants | Products | Type of chemical reaction |
| BaCl2(aq) + ZnSO4(aq) | H2CO3(aq) | Displacement |
| 2AgCl(s) | FeSO4(aq) + Cu(s) | Combination |
| CuSO4(aq) + Fe(s) | BaSO4↓ + ZnCl2(aq) | Decomposition |
| H2O(l) + CO2(g) | 2Ag(s) + Cl2(g) | Double displacement |
Give an example of a reaction where the following are involved:
Solution
Write the chemical reaction where the following changes are observed.
Precipitate is formed
Give reason for the following:
Colourless concentrated sulphuric acid in a test tube changes to blue on adding a small piece of copper to it.
Multiple choice:
A reaction of a type: AB + CD → AD + CD, involves
Give a chemical test to distinguish between the following gases.
NH3 and HCl
Select the correct answer from the options given below:
State the gaseous product formed, when
An ammonium salt reacts with an alkali.
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Lead nitrate.
Rusting of Iron: undesirable change:: Dead plants turn into manure: ______.
The percentage composition of Nitrogen in Ureas is ______.
Water boiling into water vapour is an example of chemical change.
Classify the following as physical or chemical properties
Most metal oxides form alkalis on interacting with water.
A chemical change may involve –
______ are substances that speed up the process of a chemical change and it will not undergo any change during the course of the reaction.
