Platinum and silver are corroded by

A certain dentist specializes in implanting gold and silver teeth in his patients mouths .He charges $ 650 for a gold tooth an $ 325. for a silver tooth. If his told fees for implanting gold and silver teeth last week were $ 15, 925 in total and he implanted five more gold teeth that silver teeth, how many teeth in total did he implant over the week?

A

33

B

32

C

31

D

34

Silver gets corroded due to ________ in air.

A

Oxygen

B

Hydrogen Sulphide

C

Carbon dioxide

D

Nitrogen

In a rare coin collection, all coins are either pure gold or pure silver , and there is initially one gold coin for every three silver coins . With the addition of 10 more gold coins to the collection, the ratio of gold coins to silver coins is 1 to 2. Based on this information , how many total coins are there now in this collection (after the acquisition)?

A

40

B

50

C

70

D

90

Find out which quotation parts of the following sentences has an error. In recent 'years', automobile emissions 'have disfigured' stone 'carvings', corroded bronze monuments, and 'soil' ancient buildings.

A

years

B

have disfigured

C

carving

D

soil

Gunmetal and bronze are not corroded by the action of

A

Wet chlorine

B

Synthetic detergent solution

C

Hydrochloric acid (10%)

D

Nitric acid (

Rubber lined vessels are corroded by the action of

A

Aqua regia

B

Chloroform

C

Sulphuric acid (95%)

D

All of the above

Polythene (low or high density) containers are not corroded by

A

Sulphuric acid (10%) at room temperature

B

Nitric acid (95%) at room temperature

C

Sulphur trioxide at 60°C

D

Any of these

Glass is corroded by

A

Fluorine (dry or wet)

B

Sulphuric acid

C

Phosphoric acid

D

None of these

Graphite is corroded by

A

Sulphuric acid (10%)

B

Sea water

C

Hydrochloric acid

D

None of these

Stainless steel is not corroded by

A

Hydrochloric acid (10%)

B

Nitric acid (10%)

C

Sulphuric acid (10%)

D

Saturated brine

Platinum and silver are corroded by

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