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Classify the following as physical or ch...

Classify the following as physical or chemical properties.
(a) The composition of a sample of steel is : `98%` iron, `1.5%` carbon and `0.5%` other elements.
(b) Zinc dissolves in hydrochloric acid with the evolution of hydrogen gas.
(c) Metallic sodium is soft enough to be cut with a knife.
(d) Most metal oxides form alkalis on interacting with water.

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(a) Physical (b) Chemical (c ) Physical (d) Chemical.
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Write a balanced chemical equation for each of the following reactions and also classify them. (a) Lead acetate solution is treated with dilute hydrochloric acid to form lead chloride and acetic acid solution. (b) A piece of sodium metal is added to absolute ethanol to form sodim ethoxide and hydrogen gas. (c) Iron (III) oxide on heating with carbon monoxide gas reacts to form solid iron and liberates carbon dioxide gas. (d) Hydrogen sulphide gas reacts with oxygen gas to form solid sulphur and liquid water.

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(a). What are metals? Name five metals (b). Name a metal which is so soft that it can be cut with a knife. (c). Name the metal which is the best conductor of heat and electricity. (d). What happens when a metal reacts with dilute hydrochloric acid? Explain with the help of an example. (e). Write the equations for the reactions of : (i). Magnesium with dilute hydrochloric acid. (ii). Aluminimum with dilute hydrochloric acid. (iii). Zinc with dilute hydrochloric acid (iv). Iron with dilute hydrocloric acid. Name the products formed in each case, also indicate the physical states of all the substances involved.

Write the balanced chemical equations with state symbols for the following reactions : (i) Iron filings react with steam to produce iron (III) oxide and hydrogen gas. (ii) Magnesium reacts with nitrogen upon heating to form magnesium nitride. (iii) Ethane burns in oxygen to form carbon dioxide and water. (iv) Sodium hydroxide solution (in water) reacts with hydrochloric acid (in water) to form sodium chloride (in water) and water.

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