Question

please answer this question​

Answer 1

Answer:

1 ) Option A is correct

2 ) Option D is correct

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Answer 2

$\textbf{Answer:}$

Ans:(i) The elements in a compound are always present in the fixed ratio.

$\textbf{Analyzing each statement:}$

(i) Correct

The elements are always present in a definite proportion in a compound.

(ii) Incorrect

The properties of a compound are different from the properties of its elements because elements combine together and form an entirely new substance with different properties.

(iii) Incorrect

It's not necessary that one of the elements must be a gas. There are solid-liquid mixtures, solid-solid mixtures.

Ex-Sugar and water, Oil and water etc.

(iv) Incorrect

Elements in a compound are chemically bonded to one another.Hence,they can't be separated by physical methods.

They can be separated by chemical methods like distillation.

Ans:(iv) Gold, carbon and water

$\textbf{Analyzing each statement:}$

(i)Orange juice is a mixture of different pure substances like sugar, water, Vitamin C.

(ii) Seawater is also a mixture of various substances like salt, H2O etc.

(iii)Air is a mixture of different substances like oxygen, nitrogen, carbon dioxide etc.

(iv) Gold,carbon as well as water are considered as pure substances.