SSC (English Medium) इयत्ता १० वी - Maharashtra State Board Important Questions

Rewrite the following statements by selecting the correct options:
\[\ce{CaCO3 ->[\Delta] CaO + CO2 ^}\] is a __________ reaction.

What is meant by rust?

Write the chemical formula of rust.

Give a scientific reason.

When the gas formed on heating limestone is passed through freshly prepared lime water, the lime water turns milky.

Give scientific reason.

It is reccommended to use air tight container for storing oil for long time.

Identify from the reaction the reactants that undergo oxidation and reduction.
Fe + S → FeS

Identify the type of following reaction :

Write down what you understood from the following chemical reaction.

AgNO_3(aq) + NaCI_(aq) → AgCI ↓ + NaNO_3(aq)

i) Observe the following reaction and answer the following questions.
`CuSO_4 (aq) + Fe (s) →  FeSO_4(aq) + Cu (s)`
a) Identify and write the type of chemical reaction.
b) Write the definition of above reaction.

Choose and write the correct option.

What is the type of the following reaction?

BaCl₂ + ZnSO₄ →  BaSO₄ + ZnCl₂

Study the following figure and answer questions. 

a) After heating Calcium carbonate, which gas is formed in a test tube?
b) When we pass this gas through limewater what change, did you observe?
c) Write down the chemical reaction showing the product formation after heating the Calcium carbonate.

The reaction of iron nail with copper sulphate solution is ______ reaction.

Study the following chemical reaction and answer the questions given below:

\[\ce{AgNO3_{(aq)} + NaCl_{(aq)} -> \underset{(Precipitate)}{AgCl_{(s)}}↓ + NaNO3_{(aq)}}\]

1. Identify and write the type of chemical reaction.
2. Write the definition of the above type of chemical reaction.
3. Write the names of the reactants and products of the above reaction.

Choose the correct alternative and rewrite the following sentence.

Which of the following is not required to find the pH of a given solution? 

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

Answer the following question:

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

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

 Answer the following:

What is corrosion? Do gold ornaments corrode? Justify.  

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.