Chemistry MCQs

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Acetic acid (CH3COOH) is a weak organic acid that gives vinegar its sour taste. At household concentrations (5-8% acetic acid), it is a mild acid. Vinegar can be made from a variety of base ingredients including wine, apple cider, rice, or malt. The acetic acid is produced by fermentation of the sugars in these ingredients. The most common type of vinegar in households is white distilled vinegar which is typically 4-7% acetic acid. It has a strong, pungent smell and flavor.

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Mercury is a chemical element with the symbol Hg and atomic number 80. The element is also known as quicksilver for its mobility. Mercury is one of the oldest and deadliest poisons, a highly toxic metal mined from a brilliant red ore.

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Andesite is a type of volcanic rock that is intermediate in composition between basalt and rhyolite. It is typically gray to black in color and has a fine-grained, porphyritic texture, with larger crystals of feldspar and other minerals embedded in a finer-grained matrix. Andesite is formed when magma cools and solidifies at or near the Earth’s surface. It is common in volcanic arcs and other tectonically active areas, such as the Andes Mountains in South America, where it gets its name.
Andesite is typically less dense and more viscous than basalt, and it has a lower melting point. It is often intermediate in silica content between basalt and rhyolite, with a SiO2 content of around 53-62%. Andesite can also contain other minerals such as pyroxene, amphibole, and biotite, and it may exhibit a range of textural and compositional variations depending on the conditions under which it formed. Andesite is an important rock type in many geologic settings and is used in a variety of construction and landscaping applications.

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Silica gel possesses hygroscopic properties, meaning it can absorb and hold water vapour. This makes it an effective desiccant or drying agent. When packaged with products, silica gel can help control humidity and prevent spoilage or degradation by absorbing excess moisture. This property is particularly valuable when shipping or storing items that can be negatively impacted by damp conditions, like electronics, food, and leather goods.

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Ground Level Ozone results from photochemical reactions between oxides of nitrogen (NO_x) and volatile organic compounds (VOCs) in the presence of sunlight.

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Acid rain, or acid deposition, is a broad term that includes any form of precipitation with acidic components, such as sulphuric or nitric acid that fall to the ground from the atmosphere in wet or dry forms.

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Brominated Vegetable Oil is an additive, which is used in artificial citrus flavoured aerated drinks to give it the cloudy look, so that consumers are fooled into believing that it is the real thing. India banned BVO in 1988. It is used in some countries.

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In India, the Double Sulphitation is the most commonly used method for refining of sugar. Also, it is the cheapest process of refining sugar as compared to other available process.

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The three most stable isotopes of hydrogen: Protium, Deuterium and Tritium. Para hydrogen is not an isotope of hydrogen. Molecules of hydrogen in which the spins of both the nuclei are in the opposite direction are called Para hydrogen.

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The atomic number of barium is 56.