Advertisements
Advertisements
प्रश्न
On adding a drop of barium chloride solution to an aqueous solution of sodium sulphite, white precipitate is obtained :
- Write a balanced chemical equation for the reaction involved.
- What other name can be given to this precipitation reaction?
- On adding dilute hydrochloric acid to the reaction mixture, white precipitate disappears. Why?
Advertisements
उत्तर
- `"BaCl"_2("aq") + "Na"_2"SO"_3("aq") -> underset("(White ppt.)")("BaSO"_3("s")) + 2"NaCl"("aq")`
- he precipitation reaction is also called double displacement reaction.
- White precipitate of barium sulphite reacts with dilute hydrochloric to form barium chloride and sulphur dioxide gas. Since barium chloride is water soluble, the white precipitate will slowly disappear.
`underset("(White ppt.)")(underset("Barium sulphite")("BaSO"_3("s"))) + 2"HCl"(aq") -> underset("Water soluble")("BaCl"_2("aq")) + "H"_2"O"("l") + "SO"_2("g")`
APPEARS IN
संबंधित प्रश्न
Identify the substances that are oxidised and the substances that are reduced in the following reaction.
\[\ce{4Na(s) + O2(g) -> 2Na2O(s)}\]
Identify in the following reaction (a) the substance oxidised, and (b) the substance reduced:
\[\ce{ZnO + C -> Zn + CO}\]
Give an example of an oxidation reaction.
In order to prevent the spoilage of potato chips, they are packed in plastic bags in an atmosphere of ______.
Identify from the reaction the reactants that undergo oxidation and reduction.
\[\ce{NiO + H2 -> Ni + H2O}\]
Explain the following in term of gain or loss of oxygen with two examples.
Oxidation
Why this reaction is considered a reversible reaction?
Why zinc and aluminium are considered to have a unique nature. Give balanced equations to support your answer.
Is it essential that oxidation and reduction must occur side by side in a chemical reaction? Explain
Name:
a substance that will reduce aqueous Iron(III)ions to iron(II)ions.
Complete and balance the following equation:
\[\ce{K + H2O -> }\]________+ ________
Explain the term redox reaction with an example involving the reaction of hydrogen sulphide with chlorine.
Identify the following reactions as oxidation or reduction
- Na → Na+ + e
- Fe3+ + 2 e- → Fe+
Identify the reducing agent in the following reactions
`2"H"_2 + "O"_2 -> 2"H"_2"O"`
Identify the oxidising agent (oxidant) in the following reactions
`"V"_2"O"_5 + 5"Ca" -> 2"V" + 5"CaO"`
Which among the following are physical or chemical change?
Heating of an iron rod to red hot
Identify the following reactions as oxidation/reduction/redox reaction
2Mg +O2 → 2MgO
Define oxidation number.
The metallic oxide which can be reduced by using common reducing agents is ______.
