Which one of the following is used for writing on glass?
A. Silicon
B. Graphite
C. Hydrogen fluoride
D. Hydrogen iodide
Answer: Option C
A. Silicon
B. Graphite
C. Hydrogen fluoride
D. Hydrogen iodide
Answer: Option C
Red phosphorus is less reactive than yellow phosphorus because
A. it is red in colour
B. it is highly polymerised
C. it is insoluble in C2H5OH
D. it is hard
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