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NEET Questions / Chemistry / Some Basic Concepts in Chemistry
Equal masses of oxygen and ozone are present in a container at 298 K. The ratio of their partial pressures () is:
1:1
2:3
3:2
4:3
A compound contains 28% nitrogen and 72% of a metal by weight. Three atoms of metal combine with two atoms of nitrogen. If the atomic weight of nitrogen is 14, the atomic weight of the metal is:
12
24
36
48
10 g of a metal oxide on strong heating gave 6.4 g of metal. If the formula of the metal oxide is , what is the atomic mass of the metal M?
56
43
27
65
A nitrogen oxide contains 30.43% nitrogen by mass. Which of the following could be its molecular formula?
NO
N₂O
NO₂
N₂O₅
A hydrated salt of magnesium sulfate, , contains 51.2% water by mass. What is the value of 'x' in the formula?
5
6
7
8
A sample of hydrated copper sulfate weighs 25g. After heating to remove the water of crystallization, the anhydrous copper sulfate weighs 16g. What is the percentage of water of crystallization in the original sample?
16%
25%
36%
56%
If two elements A and B combine in different ratios to form two compounds, and , then according to the Law of Multiple Proportions:
The ratio of masses of B which combine with a fixed mass of A is a simple whole number ratio.
The ratio of masses of A which combine with a fixed mass of B is a simple whole number ratio.
The ratio of masses of A which combine with a fixed mass of A is a simple whole number ratio.
The ratio of masses of B which combine with a fixed mass of B is a simple whole number ratio.
