SSC (English Medium) इयत्ता १० वी - Maharashtra State Board Important Questions for Science and Technology 1

The chemical reactions in which heat is liberated are called endothermic reactions.

Grills of doors and windows are always painted before they are used.

If sodium chloride is added to the silver nitrate solution:

a. which precipitate is formed?
b. name the type of reaction.
c. write the chemical equation.

Considering the relationship in the first pair, complete the second paie :

AgCI : White :: CuI₂ : ___________

Define: Endothermic reaction 

Choose the correct alternative and rewrite the following:

Iron is _____________________.

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

Answer the following question:
How do acids and bases react with each other? What is the name of the process? What product is obtained from these reactions?

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?

Write scientific reason.

On exposure to air, silver articles turn blackish after some time.

Explain the reaction given in the figure.

Gold plated ornaments is the example of ______.

Identify the type of chemical reaction given below:

\[\ce{CuSO4 + Fe -> FeSO4 + Cu}\]

Identify the type of chemical reaction given below:

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

Identify the type of chemical reaction given below:

\[\ce{2KClO3 -> 2KCl + 3O2 ^}\]

In a double displacement reaction ______.

Give scientific reasons.

Silver amalgam is used for filling dental cavities.