Which of the two ions, `Ca^(2+)` and `Zn^(2+)` is more stable? Why? For ionic substances which is the proper term to use 'Formula weight' or "Molecular weight'?

Which of the two ions Ca^(2+) " or " Zn^(2+) is more stable and why ?

In case of ionic substances, a more appropriate term is formula weight, rather than ‘molecular weight’. Why?

Among ferrous and ferric ions, which one is more stable? Why?

Which substance do you use to test CO_2 gas?

Which is a bigger ion among Na^(+), F^(-), O^(2-) and Mg^(2+) ? Why?

The substance which can not be used for preparing H_(2)O_(2) solution is

Which substance / tool is used to test the gases, H_2 and CO_2 ?

The equivalent weights of oxidising and reducing agents can be calculated by the number of electrons gained or lost. The equivalent weight of an oxidising agent is the number of parts by weight of the substance which gains one electron. Thus, it is equal to the molecular weight of the substance divided by the number of electrons gained in the balanced chemical equation. Similarly, equivalent weight of a reducing agent is equal to the molecular weight divided by the number of electrons lost as represented in the balanced chemical equation The equivalent weght of As_(2),S_3 in the following reaction As_(2)S_(3) + H^(+) + NO_(3)^(-) rarr NO + H_(2)O + AsO_(4)^(3-) + SO_(4)^(2-) is related to its molecular weight as