Question

fig 2 if de parallel bc find ac​

Answer 1

Answer:

Answer:HYDROGEN

•Isotopes of hydrogen:

1. Protium H

2. Deuterium D

3. Tritium T

The difference in rate of reaction of these isotopes is due to the difference in atomic masses.

• Position of hydrogen:

At the same time hydrogen shows resemblances and differences with alkali metals and halogens. So hydrogen is seperately placed in the periodic table.

• Properties of hydrogen:

At standard temperature and pressure, hydrogen is a nontoxic, nonmetallic, odorless, tasteless, colorless, and highly combustible diatomic gas with the molecular formula H2.

• Laboratory preparation of hydrogen:

It can be prepared by the reaction of zinc with aqueous alkali.

Zn+2NaOH→ Na2ZnO2 + H2

•Industrial preparation of hydrogen:

It is prepared by coal gamification followed by water gas shift reaction.

°coal gasification_steam is passed over coke at 1270K to form water gas(mixture of CO and H2) Or syn gas.

°water gas shift reaction_syn gas is mixed with excess steam and passed over iron chromate at 673K to form a mixture of CO2 and H2

CO2 is removed by sodium arsenite solution.

•Uses of hydrogen:

1. In the manufacture of ammonia, methanol, and synthetic petrol.

2. In the hydrogenation of vegetable oil.

3. As rocket fuel

Explanation:

Answer 2

Step-by-step explanation:

Biology is the study of life. The word "biology" is derived from the Greek words "bios" (meaning life) and "logos" (meaning "study"). In general, biologists study the structure, function, growth, origin, evolution and distribution of living organisms.