An element forms two different sulphates in which its weight % is 28 and 37 .What is the ratio of oxidation numbers of the element in these sulphates.

What is the nature of oxides formed by most of p -block elements?

In which of the following compounds oxidation number of an element is fractional?

Write the formula of the sulphate of the element with atomic number 13.

In which of the following pairs in there the greatest difference in the oxidation numbers of the underlined elements?

What are the two important oxidation states of group 6 elements of the periodic table ?

What is the enthalpy of formation of the most stable form of an element in its standard state ?

In which of the following pairs is there the greatest difference in the oxidation numbers of the underlined elements?

Which of the following statements is correct regarding redox reactions ? (A)An increase in oxidation number of an element is called reduction (B)A decrease in oxidation number of an element is called oxidation. (C)A reagent which lowers the oxidation number of an element in a given substance is reductant. (D)A reagent which increases the oxidation number of an element in a given substance is reductant

An element exist in nature in two isotopic forms: X^(30)(90%) and X^(32)(10%) . What is the average atomic mass of element?

An atom of an element has two electrons in the M shell. What is the (a) atomic number (b) number of protons in this element ?