Chemistry
A compound is found to have a mass ratio of element A to element B as 3 : 8. If the formula of the compound is AB, what is the relationship between the atomic masses of A and B.
Related Questions
Assertion (A): Hydroxyl radicals (OH•) are considered the "detergents" of the atmosphere.
Reason (R): Hydroxyl radicals are highly reactive and oxidise many pollutants, breaking them down into less harmful substances.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Assertion (A): The concentration of free radicals in the atmosphere is high during the night.
Reason (R): Free radicals are produced by the photolysis of molecules by solar radiation.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Atoms being extremely small, cannot be seen or weighed directly. But indirect methods of physics have enabled us to know the absolute mass of nearly all kinds of atoms. The mass of a hydrogen atom is found to be 1.66 × 10-24 g while that of a carbon atom is 1.9926 × 10-23 g. As these masses are too small, it is not convenient to use kilograms or grams as unit. It has, therefore, been considered appropriate to use the mass of some standard atom as a unit and then relate masses of other atoms to it.
(a) What do you understand by the statement "R.A.M. of silver is 108" ?
(b) Which element is considered as the standard for atomic masses ?
(c) What is the difference between R.A.M. and R.M.M.? Give an example to explain.
(d) What is the significance of amu or μ ?
(e) How is 1 amu related to grams ?
(f) Is the atomic mass expressed in amu the actual mass of an atom of that element ?
(g) Why is amu preferred instead of grams or kilogram for calculating the atomic mass of an atom ?
An element X forms a chloride with the formula XCl3, and an oxide with the formula X2O3. This oxide dissolves in water to form a solution that turns blue litmus red.
(a) Identify the element.
(b) Is X a metal or a non-metal ? Justify your answer.
(c) Write the chemical formula for the sulphate of element X.