(a) calcium
(b) carbon
(c) silicon
(d) iron
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Element X forms a chloride with the formula XCl2, which is a solid with a high melting point.
Answer : (a) X would most likely be in the same group of the Periodic Table as magnesium (Mg).
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The two forms of oxygen found in the atmosphere are (a) water and ozone (b) water and oxygen (c) ozone and oxygen (d) water and carbon-dioxide
(c) ozone and oxygen
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Why is LiF almost insoluble in water whereas LiCl soluble not only in water but also in acetone?
In this case the hydration enthalpy is very less. Hence, LiF is insoluble in water. Due to its low hydration energy and partial covalent and partial ionic character LiCl is...
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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:
Pure calcium oxide or lime, is an amorphous white solid, having a high melting point (2273K). When lime is added to water, a hissing sound is produced and a large amount...
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Name one metal and one non-metal that exist in liquid state at room temperature. Also name two metals having melting point less than 310K
Metal: Mercury (Hg); Non-metal: Bromine (Br) Two metals with melting points less than 310K are Cesium (Cs) and Gallium (Ga).
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An element A reacts with water to form a compound B which is used in white-washing.
A is calcium, it reacts with water to form calcium hydroxide which is used in white washing. So, B is Ca(OH)2. Ca(s) + 2H2O(l) ------> Ca(OH)2(aq) + H2(g) (B) On heating compound B,...
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Mountaineers carry oxygen cylinders with them because (a) there is no oxygen on high mountains.
(b) there is deficiency of oxygen on mountains at high altitude.
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Which of the following is not a physical change? (A) Boiling of water to give water vapour (B) Melting of ice to give water
(D) Combustion of Liquefied Petroleum Gas (LPG)
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Acetic acid is (A) soluble only in boiling water (B) soluble in water at room temperature
(B) soluble in water at room temperature
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What is soluble base ? give one example also
A soluble base is called an alkali if it contains and releases OH− ions quantitatively. Soluble bases are called alkalis. All alkali, alkali earth metals and ammonium salt bases are soluble. -Sodium hydroxide -Potassium hydroxide
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