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

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.

Observe the following picture a write down the chemical reaction with the explanation.

Write scientific reason.

Elements belonging to the same group have the same valency.

Write scientific reasons.

Lemon or tamarind is used for cleaning copper vessels turned greenish.

Complete the process of iron rusting by filling the blanks. Suggest a way to prohibit the process.
The iron rust is formed due to........................... reaction. Different
regions on iron surface become anode and cathode.
 Reaction on anode region :

`F_e(s) → Fe^(2+) (aq) +2e^-`

 Reaction on anode region :

`O_2(g) + 4H^+(aq) +............................ → 2H_2 O (l) `

When Fe²⁺ ions migrate from anode region they react with ................... to form Fe³⁺ ions.
A reddish coloured hydrated oxide is formed from ............... ions. It is called rust.

`2Fe_(3+) (aq) + 4H_2O(l) → ................. + 6H_+(aq) `

A way to prevent rusting ..................................................................

Identify the process shown in the diagram and explain it in short

Answer the following question.
a) What is meant by corrosion?
b) Write names of any two methods of prevention of corrosion.
c) In which method, metal like copper, aluminium are coated with a thin layer of their oxides by means of electrolysis.
d) Explain this method with diagram.

Find the odd man out:

Choose the correct alternative and rewrite the following:

Iron is _____________________.

Answer the following question:
What is corrosion? Do gold ornaments corrode? Justify.

Anuja’s father cannot see nearby objects clearly.
(a) What is the eye defect he is suffering from?
(b) How is it corrected?

Write a short note on Alloying.

Observe the following picture and answer the following questions:

1. What is rust?
2. Write the chemical formula of rust.
3. Write the reaction of oxidation of iron at the anode.
4. Write the reaction of oxidation of iron at the cathode.
5. What is corrosion?