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51
Which is the abundant in the earth's crust?
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Answer: Option A
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52
Which one among the following is the main ingredient in cement?
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Answer: Option B
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53
Which alloy has bronze, lead and tin?
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Answer: Option D
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54
When iron is mixed with . . . . . . . . and . . . . . . . . then we get stainless steel-
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Answer: Option A
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55
Which one of the following elements is alloyed with iron to produce steel which can resist high temperatures and also have high hardness and abrasion resistance?
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Answer: Option B
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56
Why do alkali metals impart colour to the flame?
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Answer: Option B
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57
Which of the following is an alloy of copper and zinc?
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Answer: Option C
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58
Mercury is a
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Answer: Option B
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59
It becomes milky when carbon dioxide gas flows in lime water. This is caused by the formation of
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Answer: Option A
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60
Which of the following metals is the most reactive metal?
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Answer: Option B
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