Assertion (A) : Formic acid is a stronger acid than acetic acid. Reason (R) : Formic acid is an organic acid.

(C) 5% – 8% acetic acid in water

The correct answer is (B) ii

Acetic acid is colourless liquid. It is miscible/ soluble in water. On adding a pinch of sodium hydrogen carbonate, Brisk effervescence is observed. Evolution of a colourless/ odourless gas.

(d) : Higher is the oxidation state of the central atom, greater is the acidity. Hence, HClO4 is a stronger acid than HClO3. HNO3 is a stronger acid than HNO2. Now, greater is...

(i) It is due to (a) Intermolecular hydrogen bonding in HF. (b) Higher H—F bond dissociation enthalpy than H—Cl. (ii) As P—P single bond (213 kJ mol-1) in P4 is much weaker than...

(i) Because bond dissociation enthalpy of H—Cl is lower than H—F. (ii) White phosphorus is more reactive than red phosphorus due to its discrete tetrahedral structure and angular strain. Red phosphorus...

This is because hydrogen bonding is multidimensional in water whereas in HF it is linear.

(a) BF3 due to greater electronegativity of fluorine it withdraws more electrons from central 'B' atom  (b) Sn+4 Greater is the charge on the ion greater is its Lewis acidic strength

(c) When ants bite, they inject formic acid in the muscle tissue. This formic acid is found at the mandible of ants.