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प्रश्न
Give reason for the following:
Electrolytic decomposition of water is a reaction involving change of state.
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उत्तर
Electrolysis of water is the decomposition of water into hydrogen and oxygen due to the passage of electric current through it.
\[\ce{2H2O(l)->[Electric Current] 2H2 (g) + O2 (g)}\]
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संबंधित प्रश्न
Give one example that illustrates the following characteristics of a chemical reaction:
Change in state
Fill in the blank
A catalyst either ................or ............... the rate of a chemical change but itself remains ............... at the end of the reaction.
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Which one of the following alters the rate of the chemical reaction without itself undergoing any change?
- temperature and Pressure
- concentration of reactants
- presence of catalyst
- none of these
Give reason for the following:
Silver nitrate solution is kept in coloured bottles.
Multiple choice:
Which of the following is not a characteristic of a chemical change?
What do you understand by 'chemical reaction'?
State the main characteristics of chemical reactions. Give at least one example in each case.
Complete and balance the following reaction:
\[\ce{CuCO3 ->[\Delta]}\]
What do you observe when H2S is passed through a lead nitrate solution.
Give a word equation for the following reaction.
Two solids which combine on heating, to give a liquid.
Give reason for the following:
The catalytic oxidation of sulphur dioxide to sulphur trioxide is represented by a double arrow {⇌}
between the reactants and products, formed in the chemical reaction.
Give balanced equation for the following conversion affected by heat alone on the substance:
Copper carbonate to copper oxide
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Calcium hydroxide.
What is the role of a catalyst in a chemical reaction?
The changes in which new substance with new chemical properties are formed are ______.
Arrange the following statements in correct sequence:
- One side is water-loving and other water-hating molecules.
- When you agitate the cloth, the dirt is surrounded by many molecules and taken away from the cloth.
- The dirt surrounded by the detergent molecules floats in the water making it dirty.
- Finally, the cloth is clean.
- The detergent molecules have two sides.
- Water hating goes and joins with dirt and oil in the cloth while the water-loving joins with the water molecules.
______ is the chemical name of limestone.
Write the effects of chemical reactions.
Collect information about the types of fuels used for cooking in your area. Discuss with your teachers/parents/others which fuels are less polluting and why.
