Black diamonds are called :

Q. Assertion : Reason: Some elements can have different structural forms called allotropes.

Q.

Statements :

All stones are diamonds.

Some diamonds are pearl.

Conclusions :

I. Some pearls are stones.

II. All diamonds are pearls.

Q.

Statement

Some gems are pearls

Some pearls are diamonds

All diamonds are rings

All rings are bangles

Conclusions

I. Some bangles are rings

II. All rings are diamonds

III. All diamonds are bangles

Q. Read this sentence to find out whether there is any grammatical mistake/error in them. The error, if any, will be in one part of the sentence. Mark the part with the error as your answer. If there is no error, mark 'no error' as your answer. (Ignore the errors of punctuation, if any)

Why are the diamonds that are mined in Sierra Leone called 'Blood Diamonds'?