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)
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A.
18 g
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B.
36 g
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C.
9 g
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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)
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A.
18 g
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B.
36 g
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C.
9 g
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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)
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A.
2 moles
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B.
4 moles
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C.
6 moles
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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. 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 main product of the thermal decomposition of calcium carbonate (CaCO3)? (2019)
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A.
Calcium oxide (CaO)
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B.
Carbon dioxide (CO2)
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C.
Calcium hydroxide (Ca(OH)2)
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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)
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A.
Sodium chloride and water
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B.
Sodium chloride and hydrogen
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C.
Hydrogen and oxygen
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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 sodium (Na) and chlorine (Cl2)? (2019)
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A.
NaCl
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B.
NaCl2
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C.
Na2Cl
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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)
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A.
Synthesis
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B.
Decomposition
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C.
Single replacement
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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)
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A.
Decomposition
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B.
Synthesis
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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 magnesium reacts with hydrochloric acid? (2020)
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A.
MgCl2
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B.
MgHCl
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C.
MgO
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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 is a redox reaction? (2019)
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A.
2H2 + O2 → 2H2O
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B.
NaCl → Na + Cl2
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C.
H2 + Cl2 → 2HCl
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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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