9 Science Atoms And Molecules Test 01
CLASS - IX Science (Atoms and Molecules)
Atomic radius is measured in nanometers and
(a) 1nm = 10-10m
(b) 1m = 10-10nm
(c) 1m = 10-9nm
(d) 1nm = 10-9m
Symbol of Iron is :- (a) Ir
Atomicity of chlorine and Argon is
(d) None of these
(a) Diatomic and Monoatomic
(b) Monoatomic and Diatomic
(c) Monoatomic and Monoatomic
(d) Diatomic and Diatomic
Molecular mass of water ( H 2O ) is (a) 18g
State law of conservation of Mass?
Define Valency? Find the Valency of oxygen and Aluminum.
Calculate the molar mass of Na2SO4 and CaCO3?
Write the chemical formula for
a) Calcium Phosphate b) Magnesium Hydroxide c) Aluminum chloride.
State the Postulates of Dalton Theory?
Find the percentage of water of crystallization in feSO4. 7H2O.
2.42g of copper gave 3.025g of a black oxide of copper, 6. 49g of a black oxide, on
reduction with hydrogen, gave 5.192g of copper. Show that these figures are in accordance with law of constant proportion?
A compound was found to have the following percentage composition by mass
Zn = 22.65%, S = 11.15%, H = 4.88%, O = 61.32%. The relative molecular mass is
287g/mol. Find the molecular formula of the compound, assuming that all the hydrogen in the compound is present in water of crystallizations.
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