The pH value of pure water at 25°C is:
The pH value of pure water at 25°C is:
Which acid is present in vinegar?
Which acid is present in vinegar?
The main ore of aluminium is:
The main ore of aluminium is:
Which type of bond is present in NaCl?
Which type of bond is present in NaCl?
Which metal is liquid at room temperature?
Which metal is liquid at room temperature?
Which salt is obtained by neutralization of HCl with NaOH?
Which salt is obtained by neutralization of HCl with NaOH?
Which element is present in all organic compounds?
Which element is present in all organic compounds?
The functional group –OH represents:
The functional group –OH represents:
Rusting of iron is an example of:
Rusting of iron is an example of:
The number of valence electrons in oxygen is:
The number of valence electrons in oxygen is:
The process of conversion of solid directly into gas is called:
The process of conversion of solid directly into gas is called:
Which gas is known as laughing gas?
Which gas is known as laughing gas?
The SI unit of amount of substance is:
The SI unit of amount of substance is:
Which compound is used as an antacid?
Which compound is used as an antacid?
The atomic mass unit (amu) is based on:
The atomic mass unit (amu) is based on:
Avogadro number is approximately:
Avogadro number is approximately:
The chemical formula of washing soda is:
The chemical formula of washing soda is:
The atomic number of an element is equal to the number of:
The atomic number of an element is equal to the number of:
The hardest naturally occurring substance is:
The hardest naturally occurring substance is:
Which gas is released during photosynthesis?
Which gas is released during photosynthesis?