Q1.(a) Give one relevant observation for each of the following:
washing soda is heated.
NaOH pellets are left in open air.
Slaked lime is added to a temporary hard water followed by soap solution and the mixture is shaken
Copper carbonate is heated.
Ammonium dichromate is heated.
(b) correct the incorrect statements:
The chemical formula of sodium plumbite is NasPbO..
Reddish brown nitrogen dioxide gas is given out when polassium nitrate is heated,
ili. The relative molecular mass of an element or a compound is the number that represent how many times
one atom of the substance is heavier than 1/12 of an atom of C-12
A molecule of an element is always monoatomic.
An element having one electron short of octet belongs to alkali metal group.
( Define the following:
Groups in a periodic table , chemical bord, nucleons, empirical formula mass, precipitation
(Dy Give reasons for the following:
Physical properties of isotopes are different.
An atom can have fractional atomic mass
Molybednum is used in the manufacture of ammonia.
i Size of elements increases in a group from top to bottom.
Electrovalent compounds conduct electricity, in molten and aqueous form.
(e) Give proper chemical test/tests to identify completely the following compounds by dry heating tests: [4]
i Zinc nitrate
li Lead nitrate
o Write balanced chemical equations:
[6]
Potassium bicarbonate reacts with sulphuric acid to form potassium sulphate, carbon dioxide and water.
Sulphur reacts with nitric acid to form sulphuric acid, nitrogen dioxide and water.
Aluminium hydroxide and methane are formed when aluminium carbide reacts with water.
(g) Calculate the percentage of sodium in sodium hypochlorite. (Na=23 , CI=35.5, O=16)
[3]
(h) Give an example of each of the following chemical changes:
A photo chemical reaction involving water.
A reaction involving a blue solution
A reaction involving formation of a dirty green ppt.
iv A reaction where colour change is noticed.
(1)Name the following:
Elements having same number of nucleons
Largest period of the periodic table
ii. Any typical element
CICC
14]
[3]
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Answer:
Martin Luther, O.S.A. was a German professor of theology, composer, priest, monk, and a seminal figure in the Protestant Reformation. Luther was ordained to the priesthood in 1507. He came to reject several teachings and practices of the Roman Catholic Church; in particular, he disputed the view on indulgences
Explanation:
Martin Luther, O.S.A. was a German professor of theology, composer, priest, monk, and a seminal figure in the Protestant Reformation. Luther was ordained to the priesthood in 1507. He came to reject several teachings and practices of the Roman Catholic Church; in particular, he disputed the view on indulgences
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