NEET Chemistry MCQ - Mcq On Some Basic Concepts Of Chemistry - Quiz-3 Solution

Q.1.

Which of the following statements about a compound is incorrect?

12%
A molecule of a compound has atoms of different elements.
18%
The ratio of atoms of different elements in a compound is fixed.
59%
A compound retains the physical properties of its constituent elements.
12%
A compound cannot be separated into its constituent elements by physical methods of separation.

Q.2.

Weight of one atom of an element is $6.644 \times 10^{-23} \ g $. Calculate g-atom of elements in 40 kg

Q.3.

How many gram of concentrated hydrochloric acid containing 37.9% HCl by weight will contain 6 g of HCl?

Q.4.

The volume of 1.0 g of hydrogen in litres at N.T.P is

Q.5.

The unit of Molar mass is

Q.6.

The sum of the mole fraction of all the components in a solution is

Q.7.

If 500 mL of a 5M solution is diluted to 2500 mL, what will be the molarity of the solution obtained

Q.8.

If 20.0 mL of 1 M CaCl2 and 60 mL of .200 M CaCl2 are mixed, the molarity of the final solution will be

Q.9.

Which of the following statements indicates that law of multiple proportion is being followed

15%
When magnesium burns in oxygen, the amount of magnesium taken for the reaction is equal to the amount of magnesium in magnesium oxide formed
23%
Sample of carbon dioxide taken from any source will always have carbon and oxygen in the ratio 1:2.
54%
Carbon forms two oxides namely CO2 and CO, where masses of oxygen which combine with fixed mass of carbon are in the simple ratio 2:1.
8%
At constant temperature and pressure 200 mL of hydrogen will combine with 100 mL oxygen to produce 200 mL of water vapour.