CBSE CHEM 3.pdf

Colloidal sols of metals like Ag, Au, Pt etc. can be prepared by Bredig’s arc method. Ellingham diagrams are graphical representation of Gibbs energy and help us to predict the feasibility of thermal reducti on of an ore. Blister copper has blister- like appearance due to the evolution of SO 2 . Mond’s process- refining of Ni; Van Arkel method- refining of Zr or Ti. Oxoacids of nitrogen- hyponitrous acid (H 2 N 2 O 2 ), nitrous acid (HNO 2 ), nitric acid (HNO 3 ). Allotropes of phosphorus- white P, red P, black P. White phosphorus is poisonous. Ozone (O 3 ) is an allotrope of oxygen (O 2 ). Allotropes of sulphur – rhombic sulphur (α-sulphur), monoclinic acid (β- sulphur). In contact process (manufacture of H 2 SO 4 ), low temperat ure and high pressure are favourable conditions for maximum yield. Oxides of chlorine- Cl 2 O, ClO 2 , Cl 2 O 6 , Cl 2 O 7 . Deacon’s process – manufacture of chlorine. Binary fluorides formed by xenon- XeF 2 , XeF 4 , and XeF 6 . Very pure nitrogen is obtained by thermal decompositio n of sodium or barium azide. Oxides of nitrogen- N 2 O, NO, N 2 O 3 , NO 2 , N 2 O 4 , N 2 O 5 . Zn, Cd and Hg are not regarded as transition metals because they have full d 10 configuration in their ground states as well as in their common oxidation states. General electronic configuration of d- block elements is, (n-1) d 1-10 ns 1-2 , while that of f – block elements is, (n-2) f 1-14 (n-1) d 0-1 ns 2 . Dr. P. N. PATHAK SASARAM, BIHAR MOB- 9097019270

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Transcript of CBSE CHEM 3.pdf

8/20/2019 CBSE CHEM 3.pdf

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Colloidal sols of metals like Ag, Au, Pt etc. can beprepared by Bredig’s arc method.

Ellingham diagrams are graphical representation ofGibbs energy and help us to predict the feasibility ofthermal reduction of an ore.

Blister copper has blister- like appearance due to theevolution of SO2.

Mond’s process- refining of Ni; Van Arkel method-refining of Zr or Ti.

Oxoacids of nitrogen- hyponitrous acid (H2N2O2), nitrousacid (HNO2), nitric acid (HNO3).

Allotropes of phosphorus- white P, red P, black P. Whitephosphorus is poisonous.

Ozone (O3) is an allotrope of oxygen (O2).

Allotropes of sulphur – rhombic sulphur (α-sulphur),monoclinic acid (β- sulphur).

In contact process (manufacture of H2SO4), lowtemperature and high pressure are favourable conditionsfor maximum yield.

Oxides of chlorine- Cl2O, ClO2, Cl2O6, Cl2O7.

Deacon’s process – manufacture of chlorine.

Binary fluorides formed by xenon- XeF2, XeF4, and XeF6.

Very pure nitrogen is obtained by thermal

decomposition of sodium or barium azide. Oxides of nitrogen- N2O, NO, N2O3, NO2, N2O4, N2O5.

Zn, Cd and Hg are not regarded as transition metalsbecause they have full d10 configuration in their groundstates as well as in their common oxidation states.

General electronic configuration of d- block elements is,(n-1) d1-10 ns1-2, while that of f – block elements is,

(n-2) f 1-14

(n-1) d0-1

ns2

.Dr. P. N. PATHAKSASARAM, BIHAR MOB- 9097019270