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
Which of the statements about the reaction below are incorrect?
\[\ce{2PbO(s) + C(s) → 2Pb(s) + CO2(g)}\]
- Lead is getting reduced.
- Carbon dioxide is getting oxidised.
- Carbon is getting oxidised.
- Lead oxide is getting reduced.
Explain the following in term Oxidation of gain or loss of oxygen with two example.
When SO2 gas is passed through saturated solution of H2S, the following reaction occurs:
SO2 + 2H2S → 2H2O + 3S
In this reaction, which substance is oxidised and which one is reduced?
Give an example of an oxidation reaction.
When copper powder is heated strongly in air, it forms copper oxide. Write a balanced chemical equation for this reaction. Name (i) substance oxidised, and (ii) substance reduced.
In the context of redox reactions, the removal of hydrogen from a substance is known as:
(a) oxidation
(b) dehydration
(c) reduction
(d) dehydrogenation
Define reduction.
TRUE \ FALSE
Hydrogen is a good oxidizing agent.
The electron releasing tendency of zinc is ______ than that of copper.
Identify from the reaction the reactants that undergo oxidation and reduction.
2Mg + O2 → 2MgO
Explain the following in term of gain or loss of oxygen with two examples.
Oxidation
Give the general group study of hydrogen with reference to
reducing power
State, giving reason, whether the substances printed in bold letters have been oxidized or reduced.
H2S + Cl2→ 2HCl + S
State whether the following conversion is oxidation or reduction:
Cu2+ + 2 e-→ Cu
Complete and balance the following equation:
\[\ce{K + H2O -> }\]________+ ________
When the positive charge on an ion increases or the negative charge on them decreases it is called as _______.
Write chemical formula for rust.
The process of reduction involves ____________.
Identify the reducing agent in the following reactions -
`"H"_2"O" + "F"_2 -> "HF" + "HOF"`
The formation of brown colour on the freshly unit surface of vegetables and fruits is because ______ of organic compounds present in them.
