Q. 14.2( 1104 Votes )
Why should a magnesium ribbon be cleaned before burning in air?
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Balance the following chemical equations and identify the type of chemical reaction.
(a) Mg(s) + Cl2(g) → MgCl2(s)
(b) HgO(s) ⎯⎯⎯⎯ (Heat) → Hg(l) + O2(g)
(c) Na(s) + S(s) ⎯⎯⎯⎯ (Fuse) → Na2S(s)
(d) TiCl4 (l) + Mg(s) → Ti(s) + MgCl2 (s)
(e) CaO(s) + SiO2(s) → CaSiO3(s)
(f) H2O2 (l) ⎯⎯⎯ UV → H2O(l) + O2 (g)NCERT - Science Exemplar
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 sodium 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.NCERT - Science Exemplar
What happens when zinc granules are treated with dilute solution of H2SO4, HCl, HNO3 , NaCl and NaOH, also write the chemical equations if reaction occurs.NCERT - Science Exemplar
During the reaction of some metals with dilute hydrochloric acid, following observations were made.
(a) Silver metal does not show any change
(b) The temperature of the reaction mixture rises when aluminium (Al) is added.
(c) The reaction of sodium metal is found to be highly explosive
(d) Some bubbles of a gas are seen when lead (Pb) is reacted with the acid. Explain these observations giving suitable reasons.NCERT - Science Exemplar
The aqueous 'solutions of copper 'sulphate and zinc sulphate appearScience - Board Papers
Based on the group valency of elements state the formula for the following giving justification for each:
(i) Oxides of 1st group elements,
(ii) Halides of the elements of group 13, and
(iii) Compounds formed when an element of group 2 combines with an element of group 16.Science - Board Papers
(a) What is gas A?
(b) What is the common name of B?
(c) What do you think could be C?
(d) What is material D? Where is it found?
(e) Name the organic compound E.
(f) What is gas F? Name the natural process during which it is released?Lakhmir Singh & Manjit Kaur - Chemistry
These two substances are most likely to be:Lakhmir Singh & Manjit Kaur - Chemistry