Question

B. Statements given below are incorrect. Write the
correct statements.
1. Black diamond is not very hard and is used
for making cheap jewellery.
2. Graphite is good conductor of heat and bad
conductor of electricity.
3. Pure diamond is transparent to visible light,
but not to X-rays.
4. In Buckminsterfullerene, each molecule
has sixty atoms arranged in reetangles and
triangles
5. Graphite is used in nuclear reactors to
speed up the excess neutrons.

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Answer 1

Answer

1. black diamond is not very hard and it is is not used for making cheap jewellery because they are are not in very high demand but are very expensive and are used in making costly jewellery
2. graphite is a good conductor of electricity

4. they are arranged in in equilateral triangle and have the the maximum number of symmetry.

5 . Uranium is used

Answer 2

Answer:

1. Black diamond is very hard metal and is used for making cheap jewellery.

2. Graphite is good conductor of heat and electricity.

3. Pure diamond is transparent to X-rays and visible light.

4. In Buckminsterfullerene, each molecule

has sixty atoms arranged in hexagons and Pentagon's.

5. Graphite is used in nuclear reactors to

slows down the excess neutrons.