Duriron has better corrosion resistance than Durichlor in hydrochloric acid.

The corrosion resistance of Durichlor to nitric acid is better than that of Duriron.

A

True

B

False

Reaction between which of the following will NOT lead to the evolution of Hydrogen gas? (A) Magnesium with dilute hydrochloric acid (B) Copper with dilute hydrochloric acid (C) Sulphur powder with dilute hydrochloric acid (D) Aluminium with dilute hydrochloric acid

A

A and C

B

B and C

C

A and B

D

A and D

Solution-1 containing 10% hydrochloric acid and 20% acetic acid at the rate F combines with Solution-2 containing 20% hydrochloric acid and 30% acetic acid at the rate D, the product formed contains 20% hydrochloric acid and 30% acetic acid at the rate P, how many independent equations containing F, D, and P are possible?

A

1

B

2

C

3

In a batch process, the reaction takes place in the presence of an acid medium. The acid is drained from the reaction vessel at the rate of 15ml/s as a result of the density difference of the acid from the reacting component. To avoid wastage of acid, it is recycled to an acid tank which has 1000 L capacity. The acid drained from the reaction vessel, picks up 50 g/L solids from the reactor. Acid is fed once again to the process from acid tank. When the process is started, the acid is almost pure in the tank as a result of filtration. As the reaction proceeds, acid in the tank gets more and more contaminated with the solids. The concentration of the solids should not exceed 100 g/L from the process point of view. The batch time is 16h. Estimate whether the concentration of the solids will exceed 100g/L during the batch reaction.

A

37.04 h

B

30.05 h

C

36.04 h

D

32.05 h

A, B, C, E, F and G are six dancers. B cannot dance better than A. A is a better dancer than G. E is a better dancer than C. E cannot dance better than B or G. F is a better dancer than A. Who among these six is the best dancer?

A

B

C

F

D

E

Which of the following chemicals are used to treat the instruments made out of polymers? i) Ethylene Oxide ii) Hydrochloric Acid iii) Silver Cyanide iv) Ozone v) Bleach vi) Saline Solution vii) Sulphuric Acid viii) Glutaraldehyde and Formaldehyde ix) Phthalaldehyde x) Hydrogen Peroxide xi) Nitric Acid xii) Peracetic Acid xiii) Silver xiv) Formic Acid xv) Citric Acid

A

i, ii, iii, iv, v, vi

B

ii, iv, vi, viii, x, xii

C

i, iv, v, viii, ix, x, xii, xiii

D

iii, iv, ix, xii, xv

What is the composition of high-silicon cast iron named Durichlor that has the highest corrosion resistance among cast irons?

A

14% silicon, 0.95% carbon and 3% molybdenum

B

10% silicon, 1% carbon and 3% molybdenum

C

14% silicon and 0.95% carbon

D

10% silicon and 1% carbon

Consider the following statements regarding corrosion of ceramic material: 1. Ceramic materials are much better suited to withstand most of these environments for reasonable time periods than are metals. 2. Corrosion of ceramic materials generally involves simple chemical dissolution, in contrast to the electrochemical processes found in metals. 3. Ceramic materials are not frequently used because of their non-resistance to corrosion. Which of the above statements is/are correct?

A

1 and 3 only

B

2 and 3 only

C

3 only

D

1 and 2 only

O, P, Q, R, S and T are six sisters who are good at knitting. T is better than S. Q is better than R. O is better than P. Q is not as good as P. S is better than O. Who among the six is the best at knitting?

A

P

B

O

C

T

D

S

Which of the following is/are the applications of Duriron because of its corrosion resistance and inherent hardness?

A

To manufacture pumps, valves, and fans

B

To make heat exchangers

C

Impressed–current anodes

D

To manufacture pumps, valves, fans, heat exchangers and impressed-current anodes

Duriron has better corrosion resistance than Durichlor in hydrochloric acid.

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