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प्रश्न
Complete and balance the following chemical equations:
N2 + O2 →
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उत्तर
N2 + O2 → 2NO(g)
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संबंधित प्रश्न
Changes in which new substances are formed are called ______ changes.
How do the following help in bringing about a chemical change?
light.
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer
Which of the following is a reducing agent?
- oxygen
- chlorine
- hydrogen
- none of these
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 the characteristics of a chemical reaction ? A chemical reaction is characterised by an irreversible change in which a new substance is formed.
Write the chemical reaction where the following changes are observed.
Colour change is noticed
Write the chemical reaction where the following changes are observed.
Physical state is changed
Give reason for the following:
Molybdenum is used in the manufacture of ammonia.
What do you observe? When
Water is added to the quick lime.
Name affects the acidified K2Cr2O7 paper and also turns lime water dirty milky.
What is observed in performing the following :
| Hydrogen | Oxygen | Carbon dioxide | Chlorine | |
| Litmus test | ||||
| Apply a burning splint to the gas | ||||
| Colour of gas | colourless | colourless | colourless | greenish-yellow |
| Odour of gas |
What do you observe when Cl2 is passed through potassium iodide (KI) solution.
Give a chemical test to distinguish between the following gases.
H2 and CO2
Represent the addition of dilute sulphuric acid to zinc by means of a chemical equation. State the function of the arrow between the reactants and products.
Give a word equation for the following reaction.
A compound which on heating shows – colour change from brown to yellow.
Explain with the help of balanced equations, how precipitation reactions are used for identifying the positive radicals in three different salts, each having a different cation [positive ion].
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Copper nitrate.
Circle the odd one out. Give reason for your choice
