Name a calcium compound which hardens on wetting with water?

Academic Chemistry NCERT Class 10

Plaster of Paris is the calcium compound that hardens on wetting with water.

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Updated on: 10-Oct-2022

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(a) Name a sodium compound used for softening hard water.(b) Which compound of calcium is used for disinfecting drinking water supply? (c) Name a metal compound which has detergent properties (cleansing properties). (d) Name one compound of calcium which is used for removing colour of a coloured cloth. (e) State a peculiar (or remarkable) property of plaster of Paris. (f) Name the substance obtained by the action of chlorine on solid (dry) slaked lime.
Name the sodium compound, which is used, for softening hard water.
An element A reacts with water to form a compound B which is used in whitewashing. The compound B on heating forms an oxide C which on treatment with water gives back B. Identify A, B and C and give the reactions involved.
From amongst the metals sodium, calcium, aluminium, copper and magnesium, name the metal:(i)Which reacts with water only on boiling, and (ii)Another which does not react even with steam.
A white chemical compound becomes hard on mixing with proper quantity of water. It is also used in surgery to maintain joints in a fixed position. Name the chemical compound.
(a) Name one ionic compound containing chlorine and one covalent compound containing chlorine.(b) How will you find out which of the water soluble compound A or B is ionic?
An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be(a) calcium(b) carbon(c) silicon(d)iron.
An alkali metal A gives a compound B (molecular mass = 40) on reacting with water. The compound B gives a soluble compound C on treatment with aluminium oxide. Identify A, B and C and give the reaction involved.
Why calcium is found in the form of compound?
Name a sodium compound which is a constituent of many dry soap powders?
An element 'X' reacts with O2 to give a compound with a high melting point. This compound is also soluble in water. The element 'X' is likely to be:(a) iron (b) calcium (c) carbon (d) silicon
Name a metal carbonate which is soluble in water?
Name the functional group present in an organic compound which gives brisk effervescence with NaHCO3.
Name a cyclic unsaturated carbon compound.
Name some Calcium-rich food items.

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