please ans this question don't give wrong ans and don't report shravanisharma122 ans
Answers
Answer:
1. b. Mg
2. a. CaSO4. 1/2 H2O
3. a. CaO
4. When CO2 is passes through Lime water [Ca(OH)2], it turns milky because lime water converts into CaCO3 .
Ca(OH)2+CO2 -----> CaCO3+ H2O
CaCO3 is not soluble in water and is white in color. So you see milky.
5. lime is actually Ca(OH)2.
When it is mixed with Chlorine, it forms Bleaching powder
Ca(OH)2+ Cl2------->CaOCl2+ H2O
CaOCl2 is the bleaching powder.
6. Plaster of Paris [ CaSO4.1/2 H2O] in contact with moisture (water) changes to solid hard mass, gypsum [ CaSO4.2 H2O]. Therefore, it gets wasted. Hence it should be stored in moisture proof containers.
7. i. CaCO3 + H2SO4------->CaSO4(s) + H2O(l) + CO2(g)
ii. CaO + SiO2----------->CaSiO3
iii. Ca(OH)2+CO2( excess)----------> CaCO3+ H2O+CO2
CaCO3+ H2O+CO2-----------> Ca(HCO3)2
8. Dead Burnt plaster is CaSO4. It is known as burnt because, when moistened with water it does not set like plaster of Paris. When plaster of Paris is heated above 393 K its water of crystallization is lost and the leftover anhydrous CaSO4 is called the Dead Burnt plaster.
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Answer:
take a pan and put some water in it . put the pan on the stove and let the water boil for some time .