Question

Assertion: $Al(OH{)}_3$ is amphoteric in nature.
Reason: It can not be used as an antacid.

• A. If both (A) and (R) are true but (R) is the correct explanation of (A)
  
• B. If both (A) and (R) are true but (R) is not the correct explanation of (A)
• C. If (A) is true but (R) is false
• D. If (A) is false and (R) is true

Answer 1

The correct option is C If (A) is true but (R) is false

$Al(OH{)}_3$ is amphoteric in nature.
An antacid is a substance which neutralizes stomach acidity. $Al(OH{)}_3$may lead to the formation of insoluble aluminium-phosphate-complexes, with a risk for hypophosphatemia and osteomalacia. Although $Al$ has a low gastrointestinal absorption, accumulation may occur mainly in the presence of renal insufficiency. Aluminium-containing drugs often cause constipation and are neurotoxic. Aluminium-containing drugs are contraindicated in pregnancy.