imp vsq from inorganic chemistry
1. Write two important ores of copper with formulae.
2. What happens when NH3 is passes over red hot CuO?
3. Define copper matte?
4. Give important uses of : zinc white, calomel, white vitriol, silver nitrate, red oxide and blue vitriol?
5. Give the molecular formula of:
Copper pyrite, calomel, cinnabar, magnetite, calamine, philosopher’s wool, Rinman’s green, Mohr’s salt, green vitriol
6. Name two ores of: copper, zinc, silver, mercury, iron
7. How is Rinman’s green prepared?
8. How is philosopher’s wool prepared?
9. What happens when zinc white is heated?
10. What happens when mercuric chloride reacts with excess of KI solution?
11. How is Nessler’s reagent prepared?
12. Define transition element with two properties?
13. Define rusting of iron with two preventive measures?
14. Define: tempering of steel, stainless steel, quenching of steel, Thomas slag,
15. What is the composition of steel?
16. Differentiate: cast iron and wrought iron, quenching and tempering of steel,
17. What is the action of heat on silver nitrate?
Answers
1.
chalcopyrite CuFeS2
chalcocite Cu2S
2.
CuO+NH3--->Cu+H2O+N2
3.
The mixture of Cuprous oxide and ferrous (Cu2O +FeO) oxide is called copper matte. It contains 50% copper.
4.
Zinc white : Used to prepare Rinmann's green.
Calomel : To make reference electrode.
white vitriol :To make lithopone.
Silver nitrate : used in election.
Red oxide : To make black oxide.
blue vitriol : As laboratory reagent.
5.
CuFeS2,Hg2Cl2,HgS,Fe3O4, ZnCO3,ZnO, ZnO.CoO(CoZnO2), (NH4)2SO4.FeSO4.6H2O,
FeSO4.7H2O
6.
Refer to q.n. 1
Zinc: ZnCo3,ZnS
Silver: Ag2S,AgCl
Mercury: HgS ,
Iron :Fe2O3,Fe3O4
7.
Co(NO)3---heat-->CoO+NO2+O2
CoO +ZnO---heat--> CoZnO2
8.
ZnCO3---->ZnO +CO2
9.
10.
HgCl2 +KI --->HgI2 +Kcl HgI2 +KI(excess)--> K2[HgI4] (Nessler's reagent)
11.
Refer to q.n. 10
12.
The element whose atom or ion has partially filled d-orbital is called transition elenent.
--> It's two properties are:
i) Have high melting and boiling points
ii)Show variable oxidation states.
13.
Formation of brownish layer on the surface of iron due to atmospheric agents like air , water,CO2 etc is called rusting of iron.
i) Using solutions like AgNO3
ii) Galvanization.
14.
*Tempering-heating steel and cooling slowly.
*Queencing- heating steel and cooling suddenly
*Thomas slag is a slag having molecular formula: Ca3(PO4)2
*Stainless steel is a type of steel having low percentage of carbon content which is strong and almost stain free.
15.
Steel(Fe-98 to 99.8,C-0.2 to2)
16.
Make table and write yourself.
17.
Action of heat on silver nitrate:
i)AgNO3-212 degree-->AgNO2+O2
ii)AgNO3--450degree-->Ag+NO2+O2
June 05, 2020
Tags :
chemistry
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