1. The most important ore of aluminium is
A. bauxite
B. magnetite
C. haematite
D. monazite
2. The organic reaction represented by equation CH3 - CH = O + H2NOH gives CH3 - CH - NH + H2O is an example of
A. an addition reaction
B. a condensation reaction
C. an oxidation reaction
D. an elimination reaction
3. The number of electrons presents in H+ is
A. zero
B. one
C. two
D. three
4. The hottest part of the gas flame is known as
A. luminous zone
B. dark zone
C. blue zone
D. non-luminous zone
5. The human body is made up of several chemical elements; the element present in the highest proportion (65%) in the body is
A. carbon
B. hydrogen
C. oxygen
D. nitrogen
6. The isomerism which exists between CH3CHCI2 and CH2CI. CH2CI is
A. chain isomerism
B. functional group isomerism
C. positional isomerism
D. metamerism
ANSWERS:
1. Answer: Option A
2. Answer: Option B
3. Answer: Option A
Explanation: H+ is a hydrogen ion, and it is an ion because it LOST an electron. Electrons are negatively charged. When an atom gains electrons it will have NEGATIVE charges.
So it has zero electron.
4. Answer: Option D
5. Answer: Option C
6. Answer: Option C
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