(a) Quick lime - Calcium oxide - \( CaO\)
Elements – Calcium, oxygen.
(b) Hydrogen bromide- \(HBr\)
Elements- Hydrogen, bromine.
(c) Baking powder- Sodium hydrogen carbonate -\(NaHCO_3\)
Elements- Sodium, hydrogen, carbon, oxygen.
(d) Potassium sulphate- \(K_2SO_4 \)
Elements- Potassium, sulphur, oxygen.
In Fig. 9.26, A, B, C and D are four points on a circle. AC and BD intersect at a point E such that ∠ BEC = 130° and ∠ ECD = 20°. Find ∠ BAC.