What is the percentage of sulfuric acid in lead accumulator?

A laboratory teacher had 1.5 litres of concentrated sulfuric acid. She replaces concentrated sulfuric acid with water after every class till the carton is empty. One student needs 10 ml of sulfuric acid mixture in every class. First class had 20 students and since then all other classes observed 10 students. Calculate total quantity of water with which mixture of sulfuric acid and water is replaced till carton is empty. Note 1.5 litres of concentrated sulfuric acid had 90% sulfuric acid and rest water

A

7230 ml

B

11230 ml

C

10230 ml

D

9230 ml

E

8230 ml

Solution-1 containing 30% sulfuric acid flowing at the rate 10 Kg/min combines with Solution-2 containing 20% sulfuric acid flowing at the rate 5 Kg/min, if their product is out at the rate 20 Kg/min what is the percentage of sulfuric acid in the product?

A

10%

B

20%

C

30%

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

What is the number of moles in 650 mL of 98% (v/v) sulfuric acid solution if density of sulfuric acid is 1.83 g/cm3?

A

63.7

B

11.9

C

6.5

D

11.6

A stock solution of 12.0 M sulfuric acid is made available. What is the best procedure to make up 100. mL of 4.0 M sulfuric acid using the stock solution and water prior to mixing?

A

Add 33.3 mL of water to the flask, and then add 66.7 mL of 12.0 M acid.

B

Add 33.3 mL of 12.0 M acid to the flask, and then dilute it with 66.7 mL of water.

C

Add 67.7 mL of 12.0 M acid to the flask, and then dilute it with 33.3 mL of water.

D

Add 67.7 mL of water to the flask, and then add 33.3 mL of 12.0 M acid.

Acid rain is any form of precipitation with high levels of nitric and sulfuric acids. It can also occurs in the form of snow,fog and tiny bits of dry materials that settle on the ground. rotting vegetation and erupting volcanoes release some chemicals that causes acid rain but majority is because of the human activities such as burning of fossil fuels, factories and auto mobiles. Acid rain has many ecological effects, few of which are given below. Which of the following, if true, would weaken the conclusion about the effects of acid rain on the environment?

A

Acid rain makes water acidic and causes them to absorb the aluminium which makes it toxic for aquatic animals.

B

It increases the corrosion rate of buildings made of limestone, sandstone and marble.

C

Acid rain damages trees at high elevations.

D

If humans by mistake consume such water causes illness and premature death from heart and lung disorder.

E

Acid rain damages on the vehicles can be eliminated by covering them during precipitation events.

Sulfurous acid is a weak acid, while sulfuric acid is a much stronger acid because

A

the sulfur in sulfuric acid is more electronegative than the sulfur in sulfurous acid

B

sulfuric acid has more oxygen atoms in its formula

C

the O–H bonds in sulfuric acid are much weaker than those in sulfurous acid

D

sulfurous acid has its hydrogen atoms bound directly to the sulfur atom

Which of the following are the active materials of a lead-acid cell? 1) Lead Peroxide (PbO2) for positive plate 2) Sponge Lead (Pb) for negative plate 3) Concentrated Sulphuric acid (H2SO4) as electrolyte 4) Dilute Sulphuric acid (H2SO4) as electrolyte

A

1, 2 and 3 only

B

1, 2 and 4 only

C

1 and 3 only

D

2 and 4 only

In a lead-acid cell dilute sulfuric acid (electrolyte) approximately comprises the following

A

One part H₂O, three parts H₂SO₄

B

Two parts H₂O, two parts H₂SO₄

C

Three parts H₂O, one part H₂SO₄

D

All H₂SO₄

The sulfuric acid (H2SO4) concentration in a lead-acid battery becomes highest when:

A

the cell is fully discharged

B

the cell is fully charged

C

the positive electrode is discharged

D

the positive electrode is charged

What is the percentage of sulfuric acid in lead accumulator?

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