Chemistry MCQs

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An electrolyte that does not completely dissociate in aqueous solution is known as weak electrolyte. For example: acetic acid, carbonic acid etc. Potassium Hydroxide is a strong electrolyte.

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One of the simplest methods of to prevent corrosion is to prevent the surface of the metallic object to come in contact with atmosphere. This can be achieved by covering the surface with paint or by some chemicals (e.g. bisphenol).

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Gold is the most malleable of all metals Malleability is the material’s ability to form a thin sheet by hammering or rolling.

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The Haber–Bosch process is the main industrial procedure for the production of ammonia. The process converts atmospheric nitrogen to ammonia by a reaction with hydrogen gas using a metal catalyst under high temperatures and pressures.

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Hard water contains calcium and magnesium ions. These ions form insoluble calcium and magnesium soaps respectively when sodium or potassium soaps are dissolved in hard water. These insoluble soaps separate as scum in water and are useless as cleansing agent.

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When we cut an onion, it releases a gas called as Propanethiol S-oxide. When mixed with certain enzymes in the onion, it creates a sulfur gas. When these gases reach the eyes, they create a mild acid which irritates the eyes.

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Bronze is a 80+% copper alloy and 90+% copper&tin alloy (commonly 12–12.5% tin) with often the addition of other metals, such as aluminium, manganese, etc.

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Gypsum is a non-metallic mineral. Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO₄· 2H₂O. It is widely mined and is used as a fertilizer and as the main constituent in many forms of plaster, blackboard/sidewalk chalk, and drywall.

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Pure silicon is the basis for most integrated circuits. It provides the base or substrate for the entire chip and is chemically doped to provide the N and P regions that make up the integrated circuit components. The silicon must be so pure that only one out of every ten billion atoms can be an impurity.

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The bonds in these diatomic molecules are non-polar covalent single bonds. However, halogens readily combine with most elements and are never seen uncombined in nature. As a general rule, fluorine is the most reactive halogen and astatine is the least reactive.