The Grade X Challenge : Chemistry : Acids, Bases and Salts

The acid used in making of vinegar is ?

• Formic acid

• Acetic acid

• Sulphuric acid

• Nitric acid

• Oil of vitriol

• Muriatic acid

• Blue vitriol

• Green vitriol

• Strong Acid

• Weak Acid

• Strong Base

• Weak Base

The pH of soil X is 7.5 while that of soil Y is 4.5. Which of the two soils, should be treated with powdered chalk to adjust its pH

• X only 

• Y only

• Both X and Y

• None of these

Assertion: The process of dissolving an acid or base in water is highly exothermic reaction.

Reason: Water must always be added slowly to acid with constant stirring.

• Both A and R are true, and R is correct explanation of the assertion 

• Both A and R are true, but R is not the correct explanation of the assertion 

• A is true, but R is false

• A is false, but R is true

Sodium carbonate is a basic compound because it is a salt of a 

• Strong acid and strong base

• Weak acid and weak base

• Strong acid and weak base

• Weak acid and strong base

Which of the following is not a base according to any of the theories?

According to Lewis acid-base concept, which is a correct statement?

• Species in which central atom has complete octet can not act as as acid

• All negatively charged ions are acids

• Molecule in which the central atom has vacant ‘d’ orbitals acts as acid

• All positively changed ions are bases