Question

The carbon pencil (commonly called lead pencil) is actually made of a mixture of graphite and clay. In a particular batch of pencils, the percentage of graphite was increased. A number of complaints were received from the users saying that the pencil was sliding on paper and therefore it had become difficult to write. What is the probable reason for this?
a. graphite has a high melting point.
b. graphite is a form of carbon.
c. graphite is a lubricant.
d. graphite is a non-metal.
Question 22: Which method of separation can be used to separate pure water from a mixture containing salt, sand and water?
a. Simple distillation
b. Crystallization
c. Fractional distillation
d. Filtration ​

Answer 1

Answer:

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