Question

If a gold sample is rated to be "20 Carat". It means that
(A) it is about 83% impure gold
(B) it is about 17% pure gold
(C) it is about 83% pure gold
(D) it is about 5/6 impure gold


Which of the following shows spontaneous combustion?
(A) White phosphorous
(B) red phosphorous
(C) Sulphur
(D) carbon (coke)​

Answer 1

Answer:

A

B

Explanation:

A option is the answer of of first question

and

B is the answer of second question

Answer 2

Answer:

1.(C)it is about 83% pure gold

2.(D)carbon(coke)