Question

which of the following is a mixture (1)sea water. (2)calcium carbonate. (3) iron. (4) oxygen​

Answer 1

Answer:

Sea Water And Calcium Carbonate

Explanation:

Because

Sea Water is a Mixture of 96.5 percent water, 2.5 percent salts, and smaller amounts of other substances

and

calcium carbonate is a mixture of carbon, oxygen, and calcium.

Answer 2

(1) Sea water is a mixture.

Explanation:

Compound:

• When two or more element of same type or different type combine together through bonding, it gives compound.

Mixture:

• When any two substance which are either chemical or non-chemical in nature it gives mixture.

Element:

• When atoms of same type is present in an substance, it is called as element.

(1) Sea Water:

• This is example of homogenous mixture.
• Thus, it is correct.

(2) Calcium carbonate:

• It is formed when atoms of calcium, oxygen and carbon combines together.
• Thus, it is a compound.
• Thus, it is incorrect.

(3) Iron:

• It is an element.
• The chemical symbol is 'Fe'.
• Thus, it is incorrect.

(4) Oxygen:

• It is an element.
• The chemical symbol is 'O'.
• Thus, it is incorrect.

Final answer:

(1) Sea water is a mixture.