Question

Fill in the blanks.
1. Graphite and ...... are lustrous nonmetals. (sulphur/10dine)
2. All....... are good conductors of heat and electricity. (metals/nonmetals)
3. The so-called lead (black part) of a pencil is made of ...... and ....... (sand/clay/sulphur/graphite)
4. Though a metal, mercury is a ...... at ordinary temperatures. (solid/liquid)
5. In galvanising, a thin layer of ...... forms on the surface of a metal. (tin/zinc)
6. Lead is ..... for humans. (poisonous/nonpoisonous)
Write 'T' for true and 'F' for false for the following statements.
1. Under ordinary conditions, bromine is a liquid.
2. Iodine is lustrous as well as a good conductor of electricity.
3. Graphite is a form of carbon.
4. Diamond, though a nonmetal, is the hardest substance known.
5. Copper, on corrosion, gives a red solid.
6. Rust has the formula Fe,Oz.XH,O.
7. Depositing a layer of tin over an iron object is called galvanising.
8. Stainless steel is an alloy.
9. Rusting does not take place in dry air.
10. Quicklime absorbs moisture.​

Answer 1

1. sulphur

2.good

3.graphite

Answer 2

Answer:

1) Iodine

2) metals

3) sulphur and graphite

4) liquid

5) zinc

6) poisonous