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51
Which of the following is a non-metal?
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Answer: Option D
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52
The boiling point of liquid nitrogen is:
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Answer: Option A
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53
. . . . . . . . is not a Allotropes of carbon.
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Answer: Option B
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54
The molecular mass of O2 is . . . . . . . .
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Answer: Option A
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55
Which of the following is not an halogen?
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Answer: Option B
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56
. . . . . . . . extinguishes the fire?
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Answer: Option B
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57
Match List I with List II.
List-I List-II
a. Hydrogen was discovered by 1. Priestley
b. The name hydrogen was proposed by 2. Bernard
c. Hydrogen peroxide was discovered by 3. Lavosier
d. Oxygen was discovered by 4. Cavendish
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Answer: Option A
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58
Which of the following gases is a noble gas?
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Answer: Option A
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59
The oxygen molecule contains . . . . . . . .
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Answer: Option D
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60
Which among the following is an element?
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Answer: Option C
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