Q. If 10 g of a substance reacts completely with 20 g of another substance, what is the total mass of the products formed? (2020)
-
A.
30 g
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B.
20 g
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C.
10 g
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D.
40 g
Solution
According to the law of conservation of mass, the total mass of the products is equal to the total mass of the reactants, which is 10 g + 20 g = 30 g.
Correct Answer:
A
— 30 g
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Q. In a double displacement reaction, which of the following pairs will react? (2021)
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A.
NaCl + AgNO3
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B.
HCl + NaOH
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C.
CaCl2 + Na2SO4
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D.
All of the above
Solution
All the given pairs can undergo double displacement reactions.
Correct Answer:
D
— All of the above
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Q. In a reaction, 2 moles of hydrogen gas react with 1 mole of oxygen gas to form water. How many grams of water are produced? (2020)
-
A.
18 g
-
B.
36 g
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C.
9 g
-
D.
27 g
Solution
2H2 + O2 → 2H2O. 1 mole of water weighs 18 g, so 2 moles produce 36 g. Thus, 18 g of water is produced from 1 mole of O2.
Correct Answer:
A
— 18 g
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Q. In a reaction, 2 moles of hydrogen react with 1 mole of oxygen to form water. How many grams of water are produced? (2020)
-
A.
18 g
-
B.
36 g
-
C.
9 g
-
D.
27 g
Solution
2 moles of H2 and 1 mole of O2 produce 2 moles of H2O. The molar mass of water is 18 g/mol, so 2 moles produce 36 g.
Correct Answer:
A
— 18 g
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Q. In the reaction 2Fe + 3Cl2 → 2FeCl3, how many moles of FeCl3 are produced from 4 moles of Fe? (2021)
-
A.
2 moles
-
B.
4 moles
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C.
6 moles
-
D.
8 moles
Solution
From 2 moles of Fe, 2 moles of FeCl3 are produced. Therefore, from 4 moles of Fe, 4 moles of FeCl3 are produced.
Correct Answer:
B
— 4 moles
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Q. In the reaction 2Na + Cl2 → 2NaCl, how many grams of NaCl can be produced from 2 moles of Na? (2021)
-
A.
58.5 g
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B.
117 g
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C.
29.25 g
-
D.
146 g
Solution
2 moles of Na produce 2 moles of NaCl. Molar mass of NaCl = 58.5 g/mol. Therefore, 2 moles of NaCl = 2 × 58.5 g = 117 g.
Correct Answer:
B
— 117 g
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Q. In the reaction 2Na + Cl2 → 2NaCl, how many grams of sodium chloride are produced from 4 moles of sodium? (2023)
-
A.
236 g
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B.
118 g
-
C.
472 g
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D.
59 g
Solution
4 moles of Na produce 4 moles of NaCl. Molar mass of NaCl = 58.5 g/mol. Therefore, 4 × 58.5 = 236 g.
Correct Answer:
A
— 236 g
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Q. In the reaction 2Na + Cl2 → 2NaCl, how many moles of NaCl are produced from 4 moles of Na? (2023)
-
A.
2 moles
-
B.
4 moles
-
C.
6 moles
-
D.
8 moles
Solution
From 2 moles of Na, 2 moles of NaCl are produced. Therefore, from 4 moles of Na, 4 moles of NaCl are produced.
Correct Answer:
B
— 4 moles
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Q. What is the balanced equation for the combustion of propane (C3H8)? (2021)
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A.
C3H8 + 5O2 → 3CO2 + 4H2O
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B.
C3H8 + 4O2 → 3CO2 + 2H2O
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C.
C3H8 + 3O2 → 3CO + 4H2O
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D.
C3H8 + 2O2 → 3CO2 + 2H2O
Solution
The balanced equation for the combustion of propane is C3H8 + 5O2 → 3CO2 + 4H2O.
Correct Answer:
A
— C3H8 + 5O2 → 3CO2 + 4H2O
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Q. What is the coefficient of O2 when balancing the equation: C4H10 + O2 → CO2 + H2O? (2023)
Solution
The balanced equation is C4H10 + 6O2 → 4CO2 + 5H2O, so the coefficient of O2 is 6.
Correct Answer:
B
— 6
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Q. What is the main product of the reaction between an acid and a carbonate? (2019)
-
A.
Salt
-
B.
Water
-
C.
Carbon dioxide
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D.
All of the above
Solution
The reaction between an acid and a carbonate produces salt, water, and carbon dioxide.
Correct Answer:
D
— All of the above
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Q. What is the main product of the thermal decomposition of calcium carbonate (CaCO3)? (2019)
-
A.
Calcium oxide (CaO)
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B.
Carbon dioxide (CO2)
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C.
Calcium hydroxide (Ca(OH)2)
-
D.
Calcium carbide (CaC2)
Solution
The thermal decomposition of calcium carbonate produces calcium oxide (CaO) and carbon dioxide (CO2).
Correct Answer:
A
— Calcium oxide (CaO)
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Q. What is the product of the reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH)? (2022)
-
A.
Sodium chloride and water
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B.
Sodium chloride and hydrogen
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C.
Hydrogen and oxygen
-
D.
Sodium and water
Solution
The reaction between HCl and NaOH produces sodium chloride (NaCl) and water (H2O).
Correct Answer:
A
— Sodium chloride and water
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Q. What is the product of the reaction between hydrochloric acid and sodium bicarbonate? (2022)
-
A.
Sodium chloride
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B.
Carbon dioxide
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C.
Water
-
D.
All of the above
Solution
The reaction produces sodium chloride, carbon dioxide, and water: HCl + NaHCO3 → NaCl + CO2 + H2O.
Correct Answer:
D
— All of the above
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Q. What is the product of the reaction between sodium (Na) and chlorine (Cl2)? (2019)
-
A.
NaCl
-
B.
NaCl2
-
C.
Na2Cl
-
D.
Na2Cl2
Solution
Sodium reacts with chlorine to form sodium chloride (NaCl).
Correct Answer:
A
— NaCl
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Q. What type of reaction is represented by the equation: CaCO3 → CaO + CO2? (2020)
-
A.
Synthesis
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B.
Decomposition
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C.
Single replacement
-
D.
Double replacement
Solution
The reaction CaCO3 → CaO + CO2 is a decomposition reaction, where one compound breaks down into two products.
Correct Answer:
B
— Decomposition
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Q. What type of reaction occurs when an acid reacts with a base? (2021)
-
A.
Decomposition
-
B.
Synthesis
-
C.
Neutralization
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D.
Combustion
Solution
An acid reacting with a base results in a neutralization reaction, producing salt and water.
Correct Answer:
C
— Neutralization
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Q. Which of the following compounds is formed when iron reacts with oxygen? (2020)
-
A.
Iron(II) oxide
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B.
Iron(III) oxide
-
C.
Iron hydroxide
-
D.
Iron sulfate
Solution
Iron reacts with oxygen to form Iron(III) oxide (Fe2O3) when sufficient oxygen is present.
Correct Answer:
B
— Iron(III) oxide
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Q. Which of the following compounds is formed when magnesium reacts with hydrochloric acid? (2020)
-
A.
MgCl2
-
B.
MgHCl
-
C.
MgO
-
D.
Mg(OH)2
Solution
Magnesium reacts with hydrochloric acid to form magnesium chloride (MgCl2) and hydrogen gas.
Correct Answer:
A
— MgCl2
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Q. Which of the following compounds is formed when sodium reacts with chlorine? (2021)
-
A.
Sodium chloride
-
B.
Sodium oxide
-
C.
Sodium bicarbonate
-
D.
Sodium sulfate
Solution
When sodium reacts with chlorine, sodium chloride (NaCl) is formed.
Correct Answer:
A
— Sodium chloride
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Q. Which of the following is a characteristic of a double displacement reaction? (2023)
-
A.
Formation of a gas
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B.
Formation of a precipitate
-
C.
Exchange of ions
-
D.
All of the above
Solution
Double displacement reactions can result in the formation of a gas, a precipitate, or involve the exchange of ions.
Correct Answer:
D
— All of the above
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Q. Which of the following is a redox reaction? (2019)
-
A.
2H2 + O2 → 2H2O
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B.
NaCl → Na + Cl2
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C.
H2 + Cl2 → 2HCl
-
D.
CaCO3 → CaO + CO2
Solution
In the reaction 2H2 + O2 → 2H2O, hydrogen is oxidized and oxygen is reduced, making it a redox reaction.
Correct Answer:
A
— 2H2 + O2 → 2H2O
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