Aqua regia is an acidic, corrosive and oxidative mixture consisting of . . . . . . . . volume/volumes of concentrated hydrochloric acid and one volume of concentrated nitric acid, often used to dissolve gold and platinum.

A mixture of concentrated nitric acid and concentrated hydrochloric acid in the ratio of . . . . . . . . is called Aqua-Regia.

A

3 : 1

B

1 : 2

C

2 : 3

D

1 : 3

Given that, 24 carat gold is pure gold, 18 carat gold is 3/4th of pure gold and 20 carat gold is 5/6th of pure gold, the ratio of the pure gold in 18 carat gold to the pure gold in 20 carat gold is -

A

5 : 8

B

10 : 9

C

8 : 5

D

9 : 10

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

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

A

1

B

2

C

3

What is the composition of aqua-regia that corrodes noble metals such as platinum, gold?

A

3 parts of nitric acid and 1 part of hydrochloric acid

B

3 parts of hydrochloric acid and 1 part of nitric acid

C

1 part of hydrofluoric acid and 3 part of hydrochloric acid

D

3 parts of hydrofluoric acid and 1 part of hydrochloric acid

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

Solution-1 containing 40% nitric acid and 20% carbon dioxide at the rate F combines with Solution-2 containing 30% nitric acid and 40% carbon dioxide at the rate D, the product formed contains 30% nitric acid and 20% carbon dioxide at the rate P, If P = xF what is x?

A

1

B

2

C

3

Solution-1 containing 10% nitric acid flowing at the rate 10 Kg/min combines with Solution-2 containing 40% nitric acid flowing at the rate 5 Kg/min, if their product contains 30% nitric acid, what is the flow rate of product?

A

10 Kg/min

B

20 Kg/min

C

30 Kg/min

Aqua regia is a 1 : 3 mixture, by volume, of

A

Conc. nitric acid and conc. hydrochloric acid

B

Conc. hydrochloric acid and conc. nitric acid

C

Conc. nitric acid and conc. sulphuric acid

D

Conc. sulphuric acid and conc. nitric acid

Directions : In each of the following questions a statement is given, followed by two conclusions. Give answer :

Statements : The Bank of England's move to auction 25 metric tons of gold drew plenty of bidders looking for a bargain, but was criticised by major gold producers worldwide.

Conclusions :
I. The Bank of England should not auction gold which it possesses to keep steady international prices of gold.
II. Bidders should quote higher gold prices to retain present value of gold in the international markets.

A

Only conclusion I follows

B

Only conclusion II follows

C

Either I or II follows

D

Neither I nor II follows

E

Both I and II follow

Aqua regia is an acidic, corrosive and oxidative mixture consisting of . . . . . . . . volume/volumes of concentrated hydrochloric acid and one volume of concentrated nitric acid, often used to dissolve gold and platinum.

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