Introduction to Chemistry

Q.

Chemistry is the branch of science that studies:

1. the composition of matter

2. properties of matter

3. interaction of matter

4. all of the above

Q. Number of H atoms in $34kgN{H}_3$ gas are:

1. $3.6\times {10}^{27}$
2. $6\times {10}^{23}$
3. $18\times {10}^{23}$
4. $6\times {10}^{27}$

Q. The volume of 1 L water upon vaporisation at STP is nearly

1. 124.3 L
2. 1 L
3. 22.4 L
4. 1243.2 L

Q. In chulhas, gaps are left between the logs:

1. all of these
2. to decrease the ignition temperature of the fuel
3. to allow the air to enter and facilitate fuel burning
4. to cut off the supply of air

Q. A low concentration of chlorine, i.e parts per million (ppm), is used for the sterilisation of water to make it fit for drinking purposes.

1. true
2. false

Q. The main constituent of LPG is butane. Then
(A) Butane can be liquefied easily under high pressure
(B) Butane is liquefied by chemically reacting with ethane and propane.

1. Only A is true
2. Only B is true
3. Both A and B are true
4. Both A and B are false

Q. The study of radioactive substances is called:

1. Nuclear chemistry
2. Analytical chemistry
3. Radio active chemistry
4. Geo chemistry.

Q. The first organic substance ever prepared in the laboratory from the inorganic compound is:

1. ethyl alcohol
2. urea
3. methane
4. ethane

Q. Who is the father of chemistry? Why?

Q. Which branch of chemistry deals with substances consisting of living organism ?

1. Physical chemistry
2. Biochemistry
3. Organic chemistry
4. Analytical chemistry