Chemistry - Study Mode

[#951] Which among the following is pure matter ?
Correct Answer

(A) Carbon dioxide

Explanation

Solution: Carbon dioxide is a pure substance, provided there is nothing else in it. A “pure substance” does not mean an element. Rather, it means that the given substance has definite physical and chemical properties. “Pure substances” can be either “Elements” or “Compounds” because all substances belonging to these categories have definite physical and chemical properties. A mixture does not have definite physical and chemical properties, and combine in varying proportions.

[#952] The National Chemical Laboratory (India) is located in
Correct Answer

(D) Pune

Explanation

Solution: NCL, India is a research, development and consulting organization with a focus on chemistry and chemical engineering. It has a successful record of research partnership with industryand is located in Pune. NCL belongs to the family of Council of Scientific and Industrial Research (CSIR), the largest chain of public funded research organization in world. NCL’s human resources comprise of over 1000 people of whom 350 are scientist, 110 are technical staff with advanced degrees in science, technology or engineering. Over 400+ students pursue their doctoral research leading to Ph.D degree. Over 400+ research papers in international journals. Over 70+ Indian and foreign patents granted to NCL.

[#953] Who is known as the 'father of modern chemistry'?
Correct Answer

(C) Antoine Lavoisier

Explanation

Solution: Antoine Lavoisier is known as the 'father of modern chemistry'.

[#954] Spirit in contact with body gives cool sensation because it is :
Correct Answer

(C) Highly volatile

Explanation

Solution: Spirit is very volatile. So when it is exposed, it evaporates rapidly to the air if released into the environment, producing a cool effect.

[#955] Which one is a sublime substance?
Correct Answer

(C) Iodine

Explanation

Solution: Iodine is a sublimate.