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16.
Which of the elements are present in all proteins?
- Carbon
- Hydrogen
- Oxygen
- Nitrogen
- A.2 and 3
- C.1,3 and 4
- B.1,2 and 4
- D.1,2,3 and 4
- Answer
- Report
Answer : [D]
17.
Which of the following elements is alloyed with iron to produce steel which can resist high temperatures and also have high hardness and abrasion resistance?
- A.Aluminium
- C.Nickel
- B.Chromium
- D.Tungsten
- Answer
- Report
Answer : [B]
18.
The first comprehensive classification of elements was made by
- A.Berzelius
- C.Mendeleef
- B.Sorensen
- D.Avogadro
- Answer
- Report
Answer : [C]
19.
The Chemical property of an element can be related to its
- A.State
- C.Molecular size
- B.Size
- D.Electronic configuration
- Answer
- Report
Answer : [D]
20.
Which is explosive?
- A.PCI2
- C.TNT
- B.NF3
- D.None of the above
- Answer
- Report
Answer : [C]
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