Chemistry - Study Mode

[#311] Chemical composition of cement is
Correct Answer

(B) Limestone, Clay and Gypsum

Explanation

Solution: Chemical composition of cement is Limestone, Clay and Gypsum.

[#312] Which one of the following elements is used in the manufacture of fertilizers ?
Correct Answer

(B) Potassium

Explanation

Solution: Nitrogen, phosphorus and potassium are the three most common bases of fertilizers. Potash can be used to make potassium (K) fertilizers. All commercial potash deposits come originally from marine deposits and are often buried deep in the earth.

[#313] Asbestos is formed of :
Correct Answer

(A) Calcium and Magnesium

Explanation

Solution: Asbestos is formed of Calcium and Magnesium.

[#314] Bayer's reagent is
Correct Answer

(A) Alkaline potassium permanganate

Explanation

Solution: Baeyer's reagent is an alkaline solution of cold potassium permanganate of violet colour solution. It is a strong oxidizing agent. As this solution interacts with a double bond compound the colour disappears and becomes colourless.

[#315] Bone ash contains
Correct Answer

(C) Calcium phosphate

Explanation

Solution: Bone ash is a white material produced by the calcination of bones. It is primarily composed of calcium phosphate. It is commonly used in fertilizers, polishing compounds and in making ceramics such as bone china. It also has historical uses in the manufacture of baking powders and assay cupels.