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Chemistry — Chemical Reactions And Equations

50 Questions Class 10 MCQs
25:00 ⏱ Time
⚡ Progress 0 / 50 answered
1
Which of the following indicates a chemical reaction?
2
Evolution of a gas is observed in:
3
Which of the following is a chemical change?
4
The correct representation of \(\mathrm{2H_2 + O_2 \rightarrow 2H_2O}\) is called:
5
Which of the following is a word equation?
6
A balanced chemical equation has:
7
Which of the following is true for \(\mathrm{2Mg + O_2 \rightarrow 2MgO}\)?
8
In the reaction \(\mathrm{Zn + H_2SO_4 \rightarrow ZnSO_4 + H_2}\), zinc:
9
The physical states in chemical equations are represented by:
10
The reaction \(\mathrm{2H_2 + O_2 \rightarrow 2H_2O}\) is:
11
\(\mathrm{CaO + H_2O \rightarrow Ca(OH)_2}\) is a:
12
\(\mathrm{2HgO \rightarrow 2Hg + O_2}\) is an example of:
13
\(\mathrm{Fe + CuSO4 \rightarrow FeSO_4 + Cu}\) is:
14
\(\mathrm{BaCl_2 + Na_2SO_4 \rightarrow BaSO_4 + 2NaCl}\) is:
15
\(\mathrm{2K + 2H_2O \rightarrow 2KOH + H_2}\) is:
16
Photosynthesis is an example of:
17
Combustion reactions are:
18
Decomposition of \(\mathrm{CaCO_3}\) on heating is:
19
The reaction \(\mathrm{HCl + NaOH \rightarrow NaCl + H_2O}\) is:
20
Burning of coal \(\mathrm{C + O_2 \rightarrow CO_2 }\)is:
21
In \(\mathrm{CuO + H_2 \rightarrow Cu + H_2O, H_2 }\) is:
22
In the above reaction, \(\mathrm{CuO}\) is:
23
Oxidation involves:
24
Reduction involves:
25
Which is a reducing agent?
26
Which is an oxidizing agent?
27
Reaction \(\mathrm{Zn + CO \rightarrow ZnO + C}\) is:
28
Rusting of iron is:
29
In \(\mathrm{2Ag_2O \rightarrow 4Ag + O_2}\), silver is:
30
In the same reaction, oxygen is:
31
Rusting of iron can be prevented by:
32
Galvanization uses:
33
Rancidity of oils occurs due to:
34
Which is an endothermic process?
35
Neutralization produces:
36
Reaction of Na with Cl2 produces:
37
Reaction of HCl with Zn produces:
38
\(\mathrm{CO + O_2 \rightarrow CO_2}\) is:
39
Which of the following is a decomposition reaction?
40
\(\mathrm{CaCO_3 + 2HCl \rightarrow CaCl_2 + H_2O + CO_2}\) is:
41
Exothermic reactions:
42
Endothermic reactions:
43
Displacement reactions depend on:
44
\(\mathrm{2Al + Fe_2O_3 \rightarrow 2Fe + Al_2O_3}\) is:
45
Precipitation reaction occurs when:
46
\(\mathrm{K + H_2O \rightarrow KOH + H_2}\) is:
47
Oxidation number of oxygen in \(\mathrm{H_2O_2}\) is:
48
In \(\mathrm{2AgCl \rightarrow 2Ag + Cl_2}\) under sunlight, \(\mathrm{Cl^-}\):
49
A reaction that releases light and heat is called:
50
\(\mathrm{Na_2CO_3 + 2HCl \rightarrow 2NaCl + H_2O + CO_2}\) is:

Frequently Asked Questions

A chemical reaction is a process in which one or more substances change to form new substances with new properties.

A chemical equation is a symbolic representation of a chemical reaction using formulas of reactants and products.

Equations are balanced to satisfy the Law of Conservation of Mass, ensuring equal atoms on both sides.

Reactants are starting substances, and products are the new substances formed in a chemical reaction.

A balanced equation has equal numbers of each type of atom on both sides of the reaction.

It shows the correct formulas of reactants and products but is not balanced.

Common symbols: (s) solid, (l) liquid, (g) gas, (aq) aqueous solution.

A combination reaction occurs when two or more reactants combine to form a single product.

The reaction of hydrogen and oxygen forming water (H2 + ½O2 ? H2O).

A reaction in which a single compound breaks down into two or more simpler substances.

Heating of calcium carbonate gives CaO and CO2 (CaCO3 ? CaO + CO2).

A single element replaces another element from its compound in a reaction.

Two compounds exchange ions to form two new compounds.

Precipitation is a type of double displacement reaction forming an insoluble solid.

Oxidation is the addition of oxygen or removal of hydrogen during a reaction.

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