Tag: chemistry

Questions Related to chemistry

Which of the following object(s) are made from leather?

chemistry nature of things objects around us different types of materials materials around us and importance of grouping

  1. Wallet

  2. jacket

  3. belt

  4. All of the above

Show answer
Correct Option: D
Explanation:

The objects that are made from leather are wallet, jacket, belt, purse, office bag etc.

Which of the following object can be made by same materials_____.

chemistry nature of things objects around us different types of materials materials around us and importance of grouping

  1. bottles, utensils, toys

  2. chair, table, house

  3. ornaments, umbrella, tents

  4. well, tube well, handpump

Show answer
Correct Option: A
Explanation:

A plastic is any material that can be shaped or molten into any form,

so you can find it in bottle, utensils,toy ,etc
Hence, 
option $A$ is correct answer.

Who was the scientist to make attempts for giving explanatory definition of element?

chemistry nature of things objects around us different types of materials materials around us and importance of grouping

  1. Rontgen

  2. Dalton

  3. Rutherford

  4. Laveziour

Show answer
Correct Option: D
Explanation:

Rontgen discovered X-rays.
Dalton proposed the postulates of Atomic Theory.
Rutherford discovered $\alpha$ and $\beta$ and also [performed the Gold-foil experiment for the discovery of the nucleus.
Laveziour attempted to give the explanatory definition of elements and stated that element is the basic unit of substance.

Identify which group of objects are made from the same material.

chemistry nature of things objects around us different types of materials materials around us and importance of grouping

  1. Comb, hairclip, water bottle and shoes

  2. Shoes, brief-case, belts and flower pot

  3. Car, bike, bicycle and ship

  4. Shirts, night suits, bed-sheets and mirrors

Show answer
Correct Option: C
Explanation:

The option $C$ contain the objects made up of by same material that is plastic .

Which of the following sublimes on heating?

chemistry nature of things objects around us different types of materials materials around us and importance of grouping

  1. Sodium chloride

  2. Copper sulphate

  3. Ammonium chloride

  4. Lead sulphate

Show answer
Correct Option: C
Explanation:

Sublimation is the process where a solid directly converts into gas without reaching liquid state.
Ammonium chloride is the solid which directly converts into gas on heating.

Which of the following object(s) are made from plastic?

chemistry nature of things objects around us different types of materials materials around us and importance of grouping

  1. Bucket

  2. Table

  3. Plate (thali)

  4. All of the above

Show answer
Correct Option: D
Explanation:

Plastic is a very useful polymer. It is used on a large scale for production of various articles. Buckets, tables, plates, chairs, bottles are few examples of articles made of plastic. Hence answer is option D.

Which of the following object(s) are made from steel?

chemistry nature of things objects around us different types of materials materials around us and importance of grouping

  1. Cupboard

  2. Table

  3. Chair

  4. All of the above

Show answer
Correct Option: D
Explanation:

Steel is an important alloy of ions that is used on a very large scale in modern industry due to its high durability and strength. It is also used to manufacture tables, chairs, cupboards, fans, utensils,etc. Thus answer is option D.

Which of the following is called as dry ice

chemistry nature of things objects around us different types of materials materials around us and importance of grouping

  1. Solid $CO _2$

  2. Solid $NO _2$

  3. Solid $SO _2$

  4. $CO _2$

Show answer
Correct Option: A
Explanation:

Solid carbon dioxide is called dry ice. Because it looks like ice and because when it melts (it actually sublimes) it goes from solid straight to gas, no liquid, hence dry ice.
Hence option A is correct.

Electric wires, coils, and machines are made of metals. Which of the following metal cannot be used for them?

chemistry nature of things objects around us different types of materials materials around us and importance of grouping

  1. copper

  2. silver

  3. iron

  4. sodium

Show answer
Correct Option: D
Explanation:

Electric wires, coils and machines are made of hard metals. Sodium is a very soft metal which can be cut through knife hence it cannot use to prepare electric wires, coils and machines.

Sodium salt of an organic acid 'X' produces effervescence with conc. $H _2SO _{4}$. 'X' reacts with the acidified aqueous $CaCl _2$ solution to give a white precipitate which decolourises acidic solution of $KMnO _4$. 'X' is 

chemistry aldehydes, ketones and carboxylic acids alkanoic acids nomenclature of carboxyl group nomenclature of carboxylic acids

  1. $C _6H _5COONa$

  2. $HCOONa$

  3. $CH _3COONa$

  4. $Na _2C _2O _4$

Show answer
Correct Option: D