Balbharati solutions for सायन्स अँड टेक्नॉलोजी १ [इंग्रजी] इयत्ता १० महाराष्ट्र राज्य मंडळ chapter 3 - Chemical reactions and equations [Latest edition]

Choose the correct option from the bracket and explain the statement giving reason.
(Oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition)
To prevent rusting, a layer of ______ metal is applied on iron sheets.

Choose the correct option from the bracket and explain the statement giving reason.
(Oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition) 

The conversion of ferrous sulphate to ferric sulphate is ______ reaction. 

When electric current is passed through acidulated water ______ of water takes place. 

Choose the correct option from the bracket and explain the statement giving a reason.
(Oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition) 

Addition of an aqueous solution of ZnSO₄ to an aqueous solution of BaCl₂ is an example of ______ reaction.

What is the reaction called when oxidation and reduction take place simultaneously? Explain with one example.

How can the rate of the chemical reaction, namely, decomposition of hydrogen peroxide be increased?

Explain the term reactant and product giving examples. 

Explain the types of reaction with reference to oxygen and hydrogen. Illustratre with examples.

Write the answer to the following.

Explain the similarity and difference in two events, namely adding NaOH to water and adding CaO to water.

Explain the term with examples.

Endothermic reaction  

Explain the  terms with examples.

 Combination reaction

Explain the terms with examples.

Balanced equation

Explain the terms with examples.

Displacement reaction

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 takes time for pieces of Shahabad tile to disappear in HCl, but its powder disappears rapidly.

Give scientific reason.

While preparing dilute sulphuric acid from concentrated sulphuric acid in the laboratory, the concentrated sulphuric acid is added slowly to water with constant stirring.

Give scientific reason.

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

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

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

Identify from the following reaction the reactants that undergo oxidation and reduction.

\[\ce{2Ag2O → 4 Ag + O2 \uparrow}\]

Identify from the reaction the reactants that undergo oxidation and reduction.

2Mg + O₂ → 2MgO

Identify from the reaction the reactants that undergo oxidation and reduction.

\[\ce{NiO + H2 -> Ni + H2O}\]

Balance the equation stepwise.
H₂S₂O₇(l) + H₂O(l) → H₂SO₄(l)

Balance the equation stepwise.

 SO₂(g) + H₂S(aq) → S(s) + H₂O(l) 

Balance the equation stepwise.

 Ag(s) + HCl(aq) → AgCl ↓+ H₂ ↑ 

Balance the equation stepwise.

NaOH(aq) + H₂SO₄(aq) → Na₂SO₄(aq) + H₂O(l)

Identify the endothermic and exothermic reaction.

HCl + NaOH → NaCl + H₂O + heat

Identify the endothermic and exothermic reaction.

\[\ce{2KClO_{3(s)}->[\Delta] 2KCl_{(s)} + 3O2}\]

Identify the endothermic and exothermic reaction.

\[\ce{CaO + H2O -> Ca(OH)2 + Heat}\]

Identify the endothermic and exothermic reaction.

\[\ce{CaCO_{3(s)}->[\Delta] CaO_{(s)} + CO2}\]