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Chemistry - 9 Chapter - 2
Chemical combination and Chemical Equations
Test - 13
1.
Elemants also decompose upon heating.
a) False
b) True
2.
Atomic mass of an elemant is determind relative to the unit mass which is ______of the mass of C-12
a) 1/10th
b) 1/12 th
c) 1/14 th
d) 1/8 th
3.
What happens when similar atoms combine together chemically?
a) they give rise to the molecules of mixtures.
b) they give rise to the molecules of compound.
c) they give rise to the molecules of element.
4.
What happens when different atoms combine together chemically?
a) they give rise to the molecules of element.
b) they give rise to the molecules of mixtures.
c) they give rise to the molecules of compound.
5.
When two elements combine to give more than one compound, the ratio in which these elements will combine, will be in simple whole number ratio.
a) It is law of multiple proportions
b) It is law of simple proportions
c) It is law of conservation of mass
d) It is law of definite proportions
6.
The success of a theory depends upon what factors?
a) how successfully explains the existing fact
b) how successfully explains the new laws.
c) both answers are correct
7.
Law of definite proportion and it states when two or more elements combine to give more than one compound the ratio in which these elements will combine will remain same. It is called?
a) Fourth law of chemical combination.
b) second law of chemical combination.
c) Third law of chemical combination.
d) First of chemical combination.
8.
When two or more elements A,B combine separately with the fixed mass of the third element E, The ratio in which these elements will combine with E is either same or simple multiple of ratio in which A and B combine with each other.
a) It is law of definite proportions
b) It is law of simple proportions
c) It is law of multiple proportions
d) It is law of reciprocal proportion
9.
________are atoms of same elements having same atomic number but different atomic mass.
a) Ions
b) Isotopes
c) Radicals
10.
The number of ______ in a atom is its Atomic Number
a) Electrons
b) Neutrons
c) Protons and Neutrons
d) Protons
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