SSC (Marathi Semi-English) १० वीं कक्षा - Maharashtra State Board Important Questions for Science and Technology 1

CuSO_4(aq) + Zn_(s) → ZnSO_4(aq) + Cu_(s) is an example of a decomposition reaction.

The reddish brown deposit formed on iron nails kept in a solution of copper sulphate is

1. Cu₂O
2. Cu
3. CuO
4. CuS

After you have dinner tonight, wash your own plates with soap/detergent.

1. What colour change is observed when soap/detergent is applied?
2. Name the type of reaction and explain it.

Methyl orange is used as an indicator. It shows colour change in acid, base and neutral substance. Tabulate your result as follows:

The chemical formula for rust is.............. .

When the substance ‘A’ is added to a solution of BaSO₄, a yellow precipitate is formed.

1. What do you think substance A is likely to be?
2. Name the precipitate.
3. Which type of reaction is this?

Taking into consideration the relationship in the first pair, complete the second pair

2H₂ + O₂ → 2H₂O :Combination Reaction :: 2HgO → 2Hg + O₂:_________

Find the odd man out:

Turmeric, Methyl Orange, Rose petals, Beetroot.

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.