NCERT Class 10/MCQ Questions for Class 10 Science Chapter 1 Chemical Reactions and Equations Sample Test,Sample questions

Question:
MCQ Questions for Class 10 Science Chapter 1 Chemical Reactions and Equations

1.Boiling of water to give water vapour.

2.Melting of ice to give water.

3.Dissolution of salt in water.

4.Combustion of Liquefied Petroleum Gas (LPG).


Question:
One of the following does not happen during a chemical reaction. This is:

1.Breaking of old bonds and formation of new bonds

2.Formation of new substances with entirely different properties

3. Atoms of one element change into those of another element to form new products

4.A rearrangement of atoms takes place to form new products


Question:
Strong heating of ferrous sulphate leads to the formation of a brown solid and two gases. This reaction can be categorised as:

1.displacement and redox.

2.decomposition and redox

3.displacement and endothermic

4.decomposition and exothermic.


Question:
When copper turnings are added to silver nitrate solution, a blue coloured solution is formed after some time. It is because copper:
(I) Displaces silver from the solution
(II) forms a blue coloured complex with AgNO3
(III) Is oxidized to Cu2+
(IV) ls reduced to Cu2+

1.(I) and (II)

2.(II) and (III)

3.(I) and (III)

4. (II) and (IV)


Question:
Which among the following is (are) double displacement reaction(s)?
(I) Pb + CuCl2 → PbCl2 + Cu
(II) Na2SO4 + BaCl2 → BaSO4 + 2NaCl
(III) C + O2 → CO2
(IV) CH4 + 2O2 → CO2 + 2H2O

1.(I) and (IV)

2.Only (II)

3.(I) and (II)

4. (III) and (IV)


Question:
You are given the solution of lead nitrate. In order to obtain a yellow precipitate, you should mix with it a solution of:

1.potassium chloride

2.potassium nitride

3.potassium sulphide

4.potassium iodide


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