In which of the following applications of Iron, rusting will occur most? Support your answer with valid reason.

A - Iron Bucket electroplated with Zinc
B - Electricity cables having iron wires covered with aluminium
C - Iron hinges on a gate
D - Painted iron fence

Whichj of the following is the third most bioligically important d-block metal after iron and zinc ?

Which of the following are physical changes? (i) Melting of iron metal (ii) Rusting of iron (iv) Bending of an iron rod (v) Drawing a wire of iron metal

Which of the following reaction cannot take place ? Justify your answer. (i) Iron + zinc sulphate to Iron sulphate + Zinc (ii) Magnesium + Silver nitrate to Magnesium nitrate +Silver (iii) Copper + dil. sulphuric acid to Copper sulphate + Hydrogen (iv) Zinc + ferrous sulphate to Iron + zinc sulphate

In which of the following process entropy increases? (a) Rusting of iron (b) Vapourisatin of Camphor (c) Crystallisation of sugar from syrup (d) Atomisation of dihydrogen

Which of the following statements regarding soil is /are correct? 1. Alluvial soils are rich in nitrogen content. 2. Black soils are rich in iron and lime but deficint in nitrogen. 3. Laterite soils are ric in iron and aluminium but deficient in nitrogen and potassium. Select the correct answer using the code given below.