• How does hydrogen get reduced when metals give out electrons?? pls answer soon
• which is the most reactive element?
• calcium symbol
• Consider the following chemical formula Fe2O3.xH2O What does xH2O refer here?
• Assertion- Silver articles become coated with a black layer upon exposure to air. Resaon- A layer of oxide gets deposited upon oxidation with air. A- Assertion and Reason both are correct and reason is the correct explanation of assertion. B- Assertion and Reason both are correct and reason is not the correct explanation of assertion. C- Assertion is true but reason is false. D- Reason is true but assertion is false Please provide an explanation too.
• what is an alloy? explain giving examples.
• why mercury is liquid
• Corrosion   
• What reaction takes place when copper gets tarnished. Name the products formed while it gets cleaned when we rub it with lemon or tamarind juice.
• How do metal displace hydrogen from dilute acids?

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