Chemistry
Class 9
Lakhmir Singh
1
Chapter 1: Matter in Our Surroundings
155 questions
2
Chapter 2: Is Matter Around Us Pure?
228 questions
3
Chapter 3: Atoms and Molecules
177 questions
Q1
Question 64:
The element having atomicity 'four' is most likely to be :
(a) argon
(b) fluorine
(c) phosphorus
(d) francium
(a) argon
(b) fluorine
(c) phosphorus
(d) francium
Q2
Question 65:
If 1.4 g of calcium oxide is formed by the complete decomposition of calcium carbonate, then the amount of calcium carbonate taken and the amount of carbon dioxide formed will be respectively :
(a) 2.2 g and 1.1 g
(b) 1.1 g and 2.5 g
(c) 2.5 g and 1.1 g
(d) 5.0 g and 1.1 g
(a) 2.2 g and 1.1 g
(b) 1.1 g and 2.5 g
(c) 2.5 g and 1.1 g
(d) 5.0 g and 1.1 g
Q3
Question 66:
The law of constant proportions was given by :
(a) Proust
(b) Lavoisier
(c) Dalton
(d) Berzelius
View all question(a) Proust
(b) Lavoisier
(c) Dalton
(d) Berzelius
4
Chapter 4: Structure of the Atom
121 questions
Question
Question 65:
If 1.4 g of calcium oxide is formed by the complete decomposition of calcium carbonate, then the amount of calcium carbonate taken and the amount of carbon dioxide formed will be respectively :
(a) 2.2 g and 1.1 g
(b) 1.1 g and 2.5 g
(c) 2.5 g and 1.1 g
(d) 5.0 g and 1.1 g
Views: 6,048 students
Text solution
Verified
Answer:
(c) 2.5 gm and 1.1 gm
Molecular mass of CaCO3: 40 + 12 + (16 × 3) = 100g
Molecular mass of CaO: 40 + 16 = 56g
Molecular mass of CO2: 12 + (16 × 2) = 44g
Reaction for the decomposition of calcium carbonate:
56 g of CaO is obtained when 100g of CaCO3 is burnt.
Therefore, to get 1.4g of CaO, the amount of CaCO3 to be burnt will be
For CO2,
100g of CaCO3 yields 44g of CO2
Therefore, 2.5g of CaCO3 will yield;
Molecular mass of CaCO3: 40 + 12 + (16 × 3) = 100g
Molecular mass of CaO: 40 + 16 = 56g
Molecular mass of CO2: 12 + (16 × 2) = 44g
Reaction for the decomposition of calcium carbonate:
56 g of CaO is obtained when 100g of CaCO3 is burnt.
Therefore, to get 1.4g of CaO, the amount of CaCO3 to be burnt will be
For CO2,
100g of CaCO3 yields 44g of CO2
Therefore, 2.5g of CaCO3 will yield;
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Practice more questions from Chemistry (Lakhmir Singh)
Q1
Question 64:
The element having atomicity 'four' is most likely to be :
(a) argon
(b) fluorine
(c) phosphorus
(d) francium
(a) argon
(b) fluorine
(c) phosphorus
(d) francium
Q2
Question 65:
If 1.4 g of calcium oxide is formed by the complete decomposition of calcium carbonate, then the amount of calcium carbonate taken and the amount of carbon dioxide formed will be respectively :
(a) 2.2 g and 1.1 g
(b) 1.1 g and 2.5 g
(c) 2.5 g and 1.1 g
(d) 5.0 g and 1.1 g
(a) 2.2 g and 1.1 g
(b) 1.1 g and 2.5 g
(c) 2.5 g and 1.1 g
(d) 5.0 g and 1.1 g
Q3
Question 66:
The law of constant proportions was given by :
(a) Proust
(b) Lavoisier
(c) Dalton
(d) Berzelius
View all(a) Proust
(b) Lavoisier
(c) Dalton
(d) Berzelius
Practice questions from Chemistry (Lakhmir Singh)
Question 1
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Question 3
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(b) Which particular atom of the above element is used for this purpose ?
(c) What value has been given to the mass of this reference atom ?
Question 4
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(Atomic masses : C = 12 u ; H = 1 u ; O = 16 u)
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| Question Text | Question 65:
If 1.4 g of calcium oxide is formed by the complete decomposition of calcium carbonate, then the amount of calcium carbonate taken and the amount of carbon dioxide formed will be respectively : (a) 2.2 g and 1.1 g (b) 1.1 g and 2.5 g (c) 2.5 g and 1.1 g (d) 5.0 g and 1.1 g |
| Updated On | Jul 16, 2023 |
| Topic | Atoms and Molecules |
| Subject | Science |
| Class | Class 9 |
| Answer Type | Text solution:1 Video solution: 8 |
| Upvotes | 893 |
| Avg. Video Duration | 6 min |
