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प्रश्न
Multiple choice:
Which of the following is not a characteristic of a chemical change?
विकल्प
It is irreversible.
No net energy change is involved.
New substance is formed.
Involves absorption or liberation of energy.
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उत्तर
No net energy change is involved.
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संबंधित प्रश्न
Changes in which new substances are formed are called ______ changes.
Copper carbonate when heated, it turns :
Give an example of the following chemical changes.
A reaction where colour change is noticed.
Name: A brown gas
Give balanced equation for the following conversion affected by heat alone on the substance:
Copper carbonate to copper oxide
Complete the statement by filling in the blank with the correct word:
The reddish-brown precipitate obtained during a double decomposition precipitation reaction between an iron salt and alkali is __________.
Select the correct answer from the options given below:
State the gaseous product formed, when
An ammonium salt reacts with an alkali.
Anaerobic bacteria digest animal waste and produce biogas (Change – A). The biogas is then burnt as fuel (Change – B). The following statements pertain to these changes. Choose the correct one.
A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.
Are these changes chemical in nature?
How would you show that the settling of curd is a chemical change?
