Related Questions

An iron blast furnace produces hot metal containing 95% Fe. The iron ore charged into the furnace contains 95% Fe2O3 and the rest is gangue. Assume that all the iron in the ore goes to hot metal. The amount of iron ore (in kg) required for producing 1000 kg of hot metal is (Atomic weight of Fe = 56 g mol-1 and that of Fe2O3 = 160 g mol-1)
Corrosion of less corrosion-resistant metal is usually increased and the attack of the more corrosion-resistant is decreased in galvanic corrosion.
In a galvanic couple, the corrosion rate of the metal with active corrosion potential is accelerated whereas the corrosion rate of noble metal retards preferentially.
Which of the following metal plating is used for high-strength steels in aircraft to improve resistance to corrosion fatigue?
Out of the total production of iron from hematite, an ore of Iron, 20% of the ore gets wasted, and out of the remaining iron, only 25% is pure iron. If the pure iron obtained in a year from a mine of hematite was 80,000 kg, then the quantity of hematite mined from that mine in the year is
Which of the following statements are true with respect to iron ore?
I. Limestone and coal are important for smelting iron ore
II. More than 20% of the world iron ore deposits are in India
III. Odisha and Jharkhand top in the production of iron ore
IV. Iran is the largest buyer of Indian iron ore
Directions : In each of the following questions a statement is given, followed by two conclusions. Give answer :

Statement : Use PVC pipes which have 10 years longer life to any other.

Assumptions :
I. People prefer only those pipes which are durable.
II.Other pipes are not durable.
Directions : In each of the following questions a statement is given, followed by three conclusions. Give answer :

Statement : Use 'X' brand shoes. These are durable and available in all sizes. - An advertisement in the newspaper A.

Assumptions :
I. Normally people like durable shoes.
II. Very few people read advertisement in a newspaper.
III. Very few people read the newspaper A.
X' agreed to supply 1000 tons of iron at Rs. 100 per ton to 'Y' to be delivered not later than 31st January, 2002. 'X' also entered into a contract with 'A' for purchase of 1000 tons of iron at Rs. 80 per ton telling 'A' clearly that the iron is needed before 31st January, 2002 for supply to 'Y' to fulfil the contract with Y. 'A' fails to supply the iron to 'X' who in tum failed to supply the same to 'Y'. In an action by 'X' against 'A'.
Statement 1: Corrosion of cans is more complicated than that of tin and iron alone. Depending on whether the tin forms a complex or not, it acts as the anode or cathode. Statement 2: In the corrosion process, if hydrogen is not evolved, it exerts a back pressure and opposes further oxidation of iron.