Chemistry Questions

Find the similarity in the following :

Carbon, Silicon, Boron, Arsenic

Apart from proposing atomic theory, what did John Dalton researched on?

Fill in the blank with the most appropriate option.

Ethanol is denatured to ___.

In a combination reaction there can be ______.

I. two or more than two reactants

II. two or more than two products

III. only one product

Washing soda is used ______.

I. for removing permanent hardness of water

II. for disinfecting drinking water

III. as a cleaning agent for domestic purpose

An atom can achieve octet by ______.

I. sharing electron

II. gaining electron

III. losing electron

Which  of  the  following  substances  cause temporary hardness in water?

1. Mg(HCO3)2

2. Ca(HCO3)2

3. CaCl2

4. MgSO4

Ionic compounds ______.

I. have high boiling point

II. have high melting point

III. conduct electricity in solution