Atoms and Molecules

Q. The number of hydrogen atoms that are present in the molecular formula of methane is ______.

1. two
2. three
3. four
4. one

Q.

Atoms cannot be divided further.

1. False

2. True

Q. Which amongst the following pairs is not an example of molecule?

1. Oxygen gas and water
2. Hydrochloric acid and water
3. Oxygen gas and ammonia
4. Sodium and potassium

Q.

Maharshi Kanada named the smallest particle of matter anu.

1. True
2. False

Q.

Define matter. What is its composition?

Q. A giant molecule contains 0.25% of a metal whose atomic weight is 59. Its molecule contains one atom of that metal. Its minimum molecular weight is :

1. $5900$
2. $23600$
3. $11800$
4. $\frac{100\times 59}{0.4}$

Q. Which amongst the following pairs is not an example of molecule?

1. Oxygen gas and ammonia
2. Sodium and potassium
3. Hydrochloric acid and water
4. Oxygen gas and water

Q.

Name the discoverer of the atom.

Q. Calculate the number of polyatomic ions which will use brackets when they are used.

1. $3$
2. $2$
3. $4$
4. $1$

Q.

Which of the following is/are true in case of molecules?

1. They are capable of independent existence .

2. They have same properties as that of the substance.

3. The molecules of a compound have definite proportions of atoms.

4. All the given options are correct.