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प्रश्न
Give a word equation for the following reaction.
A compound which on heating shows – colour change from brown to yellow.
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उत्तर
Lead dioxide →Lead oxide + Oxygen
2Pb02 → 2PbO + 02 (l)
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संबंधित प्रश्न
When carbon dioxide is passed through lime water, it turns milky due to the formation of ______.
When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it? Explain.
Define catalyst.
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
Match the column in the following table.
| 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 |
Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
Water
Give an example of a reaction where the following are involved
Catalyst
Name affects the acidified K2Cr2O7 paper and also turns lime water dirty milky.
Name: A greenish-yellow gas.
Give a chemical test to distinguish between the following gases.
CO2 and SO2
Give a chemical test to distinguish between the following gases.
HCl and Cl2
Write your observation and a balanced equation in the case of the following substances being heated.
Ammonium dichromate.
Give balanced equation for the following conversion affected by heat alone on the substance:
Zinc nitrate to nitrogen dioxide
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Copper nitrate.
________ is a chemical substance which alters the speed of a chemical reaction.
Silver metal can displace hydrogen gas from nitric acid.
The changes in which new substance with new chemical properties are formed are ______.
Write the chemical reaction of baking soda with lemon.
Acid rain is a result of ______.
