Chemistry Questions

Which of the following statements is/are true or false?

Statements :

A) H2S burns in air to give H2O and SO2

B) The decomposition of Ferrous Sulphate into Fe2O3, SO2 and SO3 occurs in the presence of heat.

Which of the following statements are CORRECT?

I. Ethanol is a good solvent for organic compounds.

II. Boiling and melting points of ethanol are low with respect to water.

III. Ethanol is used tincture iodine

Which  of  the  following  substances  cause temporary hardness in water?

1. Mg(HCO3)2

2. Ca(HCO3)2

3. CaCl2

4. MgSO4

Fill in the blank with the most appropriate option.

Ethanol is denatured to ___.

Washing soda is used ______.

I. for removing permanent hardness of water

II. for disinfecting drinking water

III. as a cleaning agent for domestic purpose

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

Ionic compounds ______.

I. have high boiling point

II. have high melting point

III. conduct electricity in solution

An atom can achieve octet by ______.

I. sharing electron

II. gaining electron

III. losing electron