Chemistry Faqs

Updated on Feb. 6, 2021 07:32 PM IST by Lakshmi Arya

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Related FAQs

Q. What does a chemical formula of a compound represent?

Ans: A chemical formula of a compound is a symbolic representation of its composition. For writing chemical formula, We need to know the symbols and valency of each atom/element or ion taking part in the f... read more

Q. What is the steps to write the Chemical Formula ?

Ans: Steps to write the Chemical Formula Write the symbols of all the elements which form the compound. Write valency of each element below its symbol. Now criss-cross the valency’s of the ... read more

Q. What are the colours of ferrous and ferric oxide ? what is the state of ferric oxide?

Ans: Ferrous means the iron(ll), which is Fe +2 and ferric means iron (lll) ion Fe +3. Ferrous oxide has the formula FeO and ferric oxide is Fe2O3 which is more common.ferric oxide is formed on heating fer... read more

Q. Why does walls shine after whitewash?

Ans: For whitewash, calcium oxide is mixed with water and calcium hydroxide is formed. Calcium hydroxide reacts with carbon dioxide in air and make a layer of calcium carbonate in the form of calcite on th... read more

Q. Define ionization energy and electron affinity.

Ans: Ionization energy of an element is the amount of energy that must be supplied to one mole of the element in the gaseous state to obtain one mole of cations in the gaseous state. Electron affinity of a... read more

Q. State the principle of refrigerator to cool the food items?

Ans: A refrigerator works on the principle of second law of thermodynamics. It states that if a cold object is placed next to hot object, then the cold object will become warm and the hot object will becom... read more