Our Environment — Science STD 10 — Question

The functional group which always occurs in the middle of a carbon chain is:

Common salt besides being used in kitchen can also be used as the raw material for making:

1. Washing soda.
2. Bleaching powder.
3. Baking soda.
4. Slaked lime.

In an ecosystem, primary consumers are :

Which one of the following four metals would be displaced from the solution of its salts by other three metals?

The eighth group of Mendeleev's periodic table is divided into how many subgroups?

A blood vessel which carries blood back to the heart is:

Which of the following statements about graphite and diamond is true?

The brain is lodged inside the cavity of skull known as :

Select the correct statements.
I. Oxide ores of heavy metals are concentrated by hydraulic washing.
II. Froth floatation process is used for the concentration of magnetic ores.
III. Oxides of highly reactive metals can be reduced to metals by the action of heat alone.
IV. Carbonate ores are decomposed to form metal oxides by heating in the absence of air.

When waste is broken down to make something new, it is called .