Acids, Bases and Salts — Science STD 10 — Question

An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be:

1. Calcium.
2. Carbon.
3. Silicon.
4. Iron.

Identify the product(s) which will be formed by using the information provided about the reactants:
Mg(s) + 2HCl →

What happens when calcium is treated with water?

1. It does not react with water.
2. It reacts violently with water.
3. It reacts less violently with water.
4. Bubbles of hydrogen gas formed stick to the surface of calcium.

1. 1 and 4
2. 2 and 3
3. 1 and 2
4. 3 and 4

The property which is not shown by acids is:

The two metals which can be extracted just by heating their sulphides in air are:

1. Sodium and copper.
2. Copper and aluminium.
3. Potassium and zinc.
4. Mercury and copper.

The pair of elements which exhibits the property of catenation is:

Which of the following pair of reactants can undergo a displacement reaction under appropriate conditions?

The molecular formula of the third member of the homologous series of ketones is:

1. C₄H₈O
   
2. C₃H₆O
   
3. C₅H₁₀O
   
4. C₆H₁₂O
   

The reactions which requires heat energy either in the form of heat, light or electricity is called _________.

Which of the following is not an example of exothermic reaction?