Choose or find odd word - Copper, Tin, Brass, Platinum, Zinc

C. BRASS

Choose or find odd word - Tortoise , Duck , Snake , Whale , Crow

D. WHALE

Choose or find odd word - Axe , Sword , Knife , Showel , Saw

D. SHOWEL

Choose or find odd word - Parrot , Swan , Vulture , Sparrow , Koel

B. SWAN

Choose or find odd number - 21 , 69 , 81 , 83

C. 81