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51.
Magnesium belongs to _________________ group
- A.Alkali metals
- C.halogens
- B.inert gases
- D.alkaline earth metals
- Answer
- Report
Answer : [D]
52.
The hardest substance known is
- A.Diamond
- C.Platinum
- B.Steel
- D.Tungsten
- Answer
- Report
Answer : [A]
53.
Atomic number gives the number of ____________ in an atom.
- A.protons
- C.(a) or (b)
- B.electrons
- D.neutrons
- Answer
- Report
Answer : [C]
54.
Phosphorus is mainly extracted from ______________
- A.sand
- C.ash
- B.bone ash
- D.fertilizer
- Answer
- Report
Answer : [B]
55.
Indentify the fertilizer from the following
- A.silica
- C.super phosphate
- B.Phospho bronze
- D.Calcium silicate
- Answer
- Report
Answer : [C]
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