1) A metal carbonate X on reacting with an acid gives a gas which when passed through a solution Y gives the carbonate back. On the other hand, a gas G that is obtained at anode during electrolysis of brine is passed on dry Y, it gives a compound Z, used for disinfecting drinking water. Identity X, Y, G and Z.
2) A dry pellet of a common base B, when kept in open absorbs moisture and turns sticky. The compound is also a by–product of chloralkali process. Identify B. What type of reaction occurs when B is treated with an acidic oxide? Write a balanced chemical equation for one such solution.
3)A sulphate salt of Group 2 element of the Periodic Table is a white, soft substance, which can be moulded into different shapes by making its dough. When this compound is left in open for some time, it becomes a solid mass and cannot be used for moulding purposes. Identify the sulphate salt and why does it show such a behaviour? Give the reaction involved.
Answers
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2
1.
X is calcium carbonate (CaCO3).
Yis slaked lime [Ca(OH)2].
G is chlorine (Cl2) gas.
Z is bleaching powder (CaOCl2).
2.
i) B is sodium hydroxide (NaOH).
(ii) Neutralisation reaction occurs when B is treated with an acidic oxide.
(iii
2NaOH + Co2 ---> Na2CO3+ H2O
X is calcium carbonate (CaCO3).
Yis slaked lime [Ca(OH)2].
G is chlorine (Cl2) gas.
Z is bleaching powder (CaOCl2).
2.
i) B is sodium hydroxide (NaOH).
(ii) Neutralisation reaction occurs when B is treated with an acidic oxide.
(iii
2NaOH + Co2 ---> Na2CO3+ H2O
anjugoel114:
where is answer 3
plz give answer3
As the Compound is from the element of Group 2 in periodic table.
We can consider element as Calcium and its salt as
Calcium sulphate hemi hydrated salt .
Common Name : plaster Of paris
Formula : CaSO4.1/2H20
Chemical Name : calcium sulphate hemi hydrated salt
We can consider element as Calcium and its salt as
Calcium sulphate hemi hydrated salt .
Common Name : plaster Of paris
Formula : CaSO4.1/2H20
Chemical Name : calcium sulphate hemi hydrated salt
Plaster of paris is used in making different Ganesh Idols and other decorative items.
But its very important that Plaster of pairs should be stored in Moisture proof container.
Because on exposure to moisture POP turns to hard solid mass called as Gypsum which cannot be used for molding Purpose.
CasO4.1/2H20 +3/2 H20 ---> CaSO4.2H2O
[POP] [Gypsum]
But its very important that Plaster of pairs should be stored in Moisture proof container.
Because on exposure to moisture POP turns to hard solid mass called as Gypsum which cannot be used for molding Purpose.
CasO4.1/2H20 +3/2 H20 ---> CaSO4.2H2O
[POP] [Gypsum]
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Answered by
1
Answer:
calcium carbonate is the answer
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