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प्रश्न
Give an example of a chemical reaction for the following situation:
Sound is produced
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उत्तर
Burning of crackers produces a loud sound.
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संबंधित प्रश्न
Give reasons:
Platinum, gold and silver are used to make jewellery.
The process of depositing a thin layer of zinc on iron articles is called ______.
Four metals P, Q, R and S are all obtained by the reduction of their oxides with carbon. Metal P is used to form a thin layer over the sheets of metal S to prevent its corrosion. Metal Q is used for electroplating tiffin boxes made of metal S whereas metal R is used in making car batteries. Metals Q and R form an alloy called solder. What are metals P, Q, R and S? How have you arrived at this conclusion?
Explain with reason:
Roasting is carried out on sulphide ores and not on carbonate ores.
Answer the following question:
What is corrosion? Do gold ornaments corrode? Justify.
Give a reason why rust turns moist red litmus blue.
Find the odd one out and give its explanation.
Write scientific reason.
Coins are made from metals and alloys.
Give solutions by giving examples of corrosion?
Describe two changes that are harmful. Explain why you consider them harmful. How can you prevent them?
