Chemistry
Which among the following is a covalent compound ?

Magnesium fluoride
Calcium chloride
Carbon tetrachloride
Sodium chloride

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Chemistry
All isotopes of the same element have ________

The same atomic number but different atomic masses
Different atomic numbers and the same atomic mass
The same atomic number and the atomic mass
Different atomic numbers and different atomic mass

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Chemistry
The Latin word formica means ant. The name formic acid is derived from this Latin word because

this acid was first obtained by the distillation of ants
this acid, in ancient times, was used to eliminate ant-hills
ants are attracted by the odour of this acid
this corrosive acid is secreted by ants to drive away their enemies

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