Anita she's asking you today match the reaction between Sodium and water after telling award in nature of reaction and its Adit cautiously with no hurry so that no explosion takes place what products are formed when sodium reacts with water write the word equation of the reaction
Answers
Answer:
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Explanation:
Short Answer Type Questions
1.Write the balanced chemical equations for the following reactions and identify the type of reaction in each case.
(a) Thermit reaction, iron (III) oxide reacts with aluminium and gives molten iron and aluminium oxide.
(b) Magnesium ribbon is burnt in an atmosphere of nitrogen gas to form solid magnesium nitride.
(c) Chlorine gas is passed in an aqueous potassium iodide solution to form potassium chloride solution and solid iodine.
(d) Ethanol is burnt in air to form carbon dioxide, water and releases heat.
Ans.
ncert-exemplar-problems-for-class-10-science-chapter-1-chemical-reactions-and-equations-1
2.A solution of potassium chloride when mixed with silver nitrate solution, an insoluble white substance is formed. Write the chemical reaction involved and also mention the type of the chemical reaction.
Ans.
ncert-exemplar-problems-for-class-10-science-chapter-1-chemical-reactions-and-equations-2
It is a double displacement reaction. It is also a precipitation reaction as AgCl is a white precipitate.
3.Write the balanced chemical equations for the following reactions.
(a)Sodium carbonate on reaction with hydrochloric acid in equal molar concentrations gives sodium chloride and sodium hydrogen-carbonate.
(b)Sodium hydrogencarbonate on reaction with hydrochloric acid gives sodium chloride, water and liberates carbon dioxide.
(c)Copper sulphate on treatment with potassium iodide precipitates cuprous iodide (Cu_{ 2 }{ I }_{ 2 }), liberates iodine gas and also forms potassium sulphate.
Ans.
ncert-exemplar-problems-for-class-10-science-chapter-1-chemical-reactions-and-equations-3
4.Why do fireflies glow at night?
Ans. It is because protein present in fireflies undergoes oxidation in presence of air and an enzyme. This chemical reaction involves emission of visible light. Therefore, fireflies glow at night.
5.Grapes hanging on the plant do not ferment but after being plucked from the plant can be fermented. Under what conditions do these grapes ferment? Is it a chemical or a physical change?
Ans. Grapes when attached to plants are living and therefore they have their immune system due to which they cannot get fermented. When microbes attack plucked grapes in absence of air, they undergo fermentation to form alcohol. This is a chemical process.
6.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.
Ans. (a) It is because silver is less reactive than hydrogen. It cannot displace hydrogen from dilute acid.
(b) It is because the reaction is exothermic.
(c) It is because sodium is highly reactive and forms hydrogen gas in the presence of moisture (H_{ 2 }O) which catches fire as the reaction is highly exothermic and H_{ 2 } is highly inflammable.
(d) It is due to formation of hydrogen gas. The reaction becomes slow after some time as PbCl_{ 2 }(s) covers Pb metal