SSC (English Medium) इयत्ता १० वी - Maharashtra State Board Question Bank Solutions for Science and Technology 1

Electrolysis is used to obtain pure metal from impure metal.

Write scientific reason.

Farsightedness, this defect can be corrected by using convex lens.

Explain the factors affecting the rate of chemical reaction with example.

Explain the following reaction with their balanced chemical equation.

Hydrogen sulphide reacts with sulphur dioxide.

Explain the following reaction with the balanced equation.

Aluminium reacts with dil hydrochloric acid

Explain the following reaction with the balanced equation.

Reaction of zinc with dil hydrochloric acid

Write a short note on the galvanometer.

Find the power of a convex lens of focal length of + 25 cm.

If focal length of a convex lens is 20 cm at what is the power of the lens?

Balance the given chemical reaction as per the instructions below.

\[\ce{NaOH + H2SO4 -> Na2SO4 + H2O}\]

Oxidation means losing electrons then what is reduction?

Identify the type of chemical reaction given below:

\[\ce{2Mg + O2 -> 2MgO}\]

When hydrogen gas is passed over black copper oxide, a reddish-coloured layer of copper is formed.

Answer the questions that follow based on this reaction.

1. Write the equation.
2. What type of reaction is it?
3. Complete the blanks:
   In this reaction, an oxygen atom goes away from CuO (copper oxide), which means that ______ of copper oxide takes place, whereas a hydrogen molecule takes up an oxygen atom and water (H₂O) is formed, meaning ______ of hydrogen takes place.

Answer the questions based on the equation below:

\[\ce{CH3 - CH2 - OH ->[{[O]}][K2Cr2O7/H2SO4] CH3 - COOH}\]

1. What type of reaction is it?
2. What is the role of the chemical written on the arrow?
3. Give one example of one such type of chemical as in answer (b).

It is recommended to use air tight containers for storing oil for a long time.

The power of convex lens of focal length 20 cm is ______.

Identify the figure and give its use.

Suggest measures in bursting fire crackers in festivals and processions.

Explain the role of citizen in pollution control.

What is corrosion?

Compare roasting and calcination.