Exams

Which  of  the  following  substances  cause temporary hardness in water?

1. Mg(HCO3)2

2. Ca(HCO3)2

3. CaCl2

4. MgSO4

Which of the following statements about the usage of the term ‘barbarian’ is/are correct?

1. It is derived from the Greek word ‘barbaros’ which means anon-Greek.

2. Romans used the term for the Germanic tribes, the Gauls and the Huns.

Select the correct answer using the code given below.

Find the odd word / letter / number from the given alternative

Which one of the following is the most characteristic property of an element?

What is the position of metallic ion and non-metallic ion in a chemical formula?

Correct answer for the given blank out of the four alternatives.

The main failings were of conception and a political willingness to settle _________ easy options. _______________ the expansive declarationsof the need "to maintain effective security of all nuclear materials, _______________ includes nuclear materials used in nuclear weapons”, thesummits narrowed their _______________ to civilian holdings __________________ non­nuclear weapon states.

_______________ includes nuclear materials used in nuclear weapons”

An electron loses potential energy when it

Solve the following.

-4 - (-7 - 12 / 4) = ?