Introduction to Chemistry

Q. How many hydrogen-bonded water molecule(s) are associated in $CuS{O}_4.5H_{2}O?$

Q. Explain the structure of $C{O}_3^{2-}$ ion in terms of resonance.

Q.

What is the hardest branch of chemistry?

Q. The volume of 1 L water upon vaporisation at STP is nearly

1. 124.3 L
2. 1 L
3. 22.4 L
4. 1243.2 L

Q.

Why it is called chemistry?

Q.

Name the source from which litmus solution is obtained. What is the use of this solution?

Q.

What type of chemical bond is found in Sodium chloride?

Q.

Give Two Application Of Evaporation.

Q. Which of the following glycosidic linkages is present in cellulose:

1. $C_2-C_4$ glycosidic linkage
2. $C_1-C_3$ glycosidic linkage
3. $C_1-C_2$ glycosidic linkage
4. $C_1-C_4$ glycosidic linkage

Q.

What is the full form of PEP?

Q.

Which one of the following is used as an insecticide?

1. DDT

2. Chloroform

3. Freon

4. Iodoform

Q.

What is physical chemistry in simple words?

Q.

The full form of NPL is national physical laboratory

1. True
2. False

Q.

A person who studies and gains specialization in chemistry is called.

1. Physicist.

2. Geologist.

3. Chemist.

4. Mathematician.

Q.

Three liquids are given to you. One is hydrochloric acid, another is sodium hydroxide and third is a sugar solution. How will you identify them? You have only turmeric indicator.

Q.

Write a brief description of the structure of ${\mathrm{HClO}}_3$.

Q. Reactions involving organic compounds generally takes place more slowly than those involving inorganic compounds. This is because?

Q.

Write some historical facts when alchemists attempted to convert cheap metals to gold.

Q.

Which of the following does not depend upon the temperature

1. a) molarity

2. b) normality

3. c) formality

4. d) molality

Q. Who discovered electron?

Q.

What type of chemical bond is found in Potassium chloride?

Q.

Name the halogen that is used as a germicide and disinfectant.

Q. Which of the following ores are concentrated by froth flotation?

1. Copper pyrite
2. Magnetite
3. Galena
4. Haematite

Q.

Which of the following is not a compound?

1. sand

2. water

3. sugar

4. salt

Q.

You are given two samples of water labelled as “A “ and ”B”. Sample “A” boils at ${100}^{\circ }\mathrm{C}$ and sample B bBoils at ${102}^{\circ }\mathrm{C}$. Which sample of water will not freeze at $0^{\circ }\mathrm{C}$. Comment.

Q.

Which phenomenon occurs during drying of wet clothes?

Q. Who is considered as the founding father of chemistry?

1. Boyle
2. Aristotle
3. Sir Francis
4. John Mayow

Q. Who is called father of modern chemistry ?

1. Gilbert Lewis
2. Gibbs
3. Otto Hahn
4. Antoine Lavoisier

Q.

4. Which one of the following is an incorrect statement?

1. Evaporation takes place at all temperatures.

2. Evaporation causes a change in state.

3. Evaporation takes place at a fixed temperature.

4. Evaporation is a slow process.

Q.

The law of conservation of mass is strictly valid if mass and ________________ [energy/volume] are considered together.