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 80:
A liquid compound X of molecular mass 18 u can be obtained from a number of natural sources. All the animals and plants need liquid X for their survival. When an electric current is passed through 200 grams of pure liquid X under suitable conditions, then 178 grams of gas Y and 22 grams of gas Z are produced. Gas Y is produced at the positive electrode whereas gas Z is obtained at the negative electrode. moreover, gas Y supports combustion whereas gas Z burns itself causing explosions.
(a) Name (i) liquid X (ii) gas Y, and (iii) gas Z.
(b) What is the ratio of the mass of element Z to the mass of element Y in the liquid X ?
(c) Which law of chemical combination is illustrated by this example ?
(d) Name two sources of liquid X.
(e) State an important use of Y in our life
(a) Name (i) liquid X (ii) gas Y, and (iii) gas Z.
(b) What is the ratio of the mass of element Z to the mass of element Y in the liquid X ?
(c) Which law of chemical combination is illustrated by this example ?
(d) Name two sources of liquid X.
(e) State an important use of Y in our life
Q2
Question 81:
One of the forms of a naturally occurring solid compound P is usually used for making the floors of houses. On adding a few drops of dilute hydrochloric acid to P, brisk effervescence are produced. When 50 g of reactant P was heated strongly, than 22 g of a gas Q and 28 g of a solid R were produced as products. Gas Q is the same which produced brisk effervescence on adding dilute HCl to P. Gas Q is said to cause global warming whereas solid R is used for white-washing.
(a) What is (i) solid P (ii) gas Q, and (iii) solid R.
(b) What is the total mass of Q and R obtained from 50 g of P ?
(c) How does the total mass of Q and R formed compare with the mass of P taken ?
(d) What conclusion do you get from the comparison of masses of products and reactant ?
(e) Which law of chemical combination is illustrated by the example given in this problem ?
(a) What is (i) solid P (ii) gas Q, and (iii) solid R.
(b) What is the total mass of Q and R obtained from 50 g of P ?
(c) How does the total mass of Q and R formed compare with the mass of P taken ?
(d) What conclusion do you get from the comparison of masses of products and reactant ?
(e) Which law of chemical combination is illustrated by the example given in this problem ?
Q3
Question 1:
What do we call those particles which have more or less electrons than the normal atoms ?
View all question4
Chapter 4: Structure of the Atom
133 questions
Question
Question 81:
One of the forms of a naturally occurring solid compound P is usually used for making the floors of houses. On adding a few drops of dilute hydrochloric acid to P, brisk effervescence are produced. When 50 g of reactant P was heated strongly, than 22 g of a gas Q and 28 g of a solid R were produced as products. Gas Q is the same which produced brisk effervescence on adding dilute HCl to P. Gas Q is said to cause global warming whereas solid R is used for white-washing.
(a) What is (i) solid P (ii) gas Q, and (iii) solid R.
(b) What is the total mass of Q and R obtained from 50 g of P ?
(c) How does the total mass of Q and R formed compare with the mass of P taken ?
(d) What conclusion do you get from the comparison of masses of products and reactant ?
(e) Which law of chemical combination is illustrated by the example given in this problem ?
Views: 5,358 students
Found 7 tutors discussing this question
Discuss this question LIVE
15 mins ago
Text solution
Verified
Answer:
(a) (i) Solid P is calcium carbonate (CaCO3).
(ii) Gas Q is carbon dioxide (CO2).
(iii) Solid R is calcium oxide (CaO).
(b) When 50g of reactant P is heated, Q and R are produced. According to the law of conservation of mass, same amount of Q and R will be produced. Therefore, 50g of Q and R will be produced on heating 50g of P.
(c) According to the law of conservation of mass, same amount of Q and R will be produced depending upon the amount of P by mass.
(d) When we compare the mass of reactants to that of their product, it will be seen that the total mass of the reactants is equal to the total mass of their product.
(e) In the example, the law of conservation of mass proposed by Antoine Lavoisier is illustrated.
(ii) Gas Q is carbon dioxide (CO2).
(iii) Solid R is calcium oxide (CaO).
(b) When 50g of reactant P is heated, Q and R are produced. According to the law of conservation of mass, same amount of Q and R will be produced. Therefore, 50g of Q and R will be produced on heating 50g of P.
(c) According to the law of conservation of mass, same amount of Q and R will be produced depending upon the amount of P by mass.
(d) When we compare the mass of reactants to that of their product, it will be seen that the total mass of the reactants is equal to the total mass of their product.
(e) In the example, the law of conservation of mass proposed by Antoine Lavoisier is illustrated.
Was this solution helpful?
20
Share
Report
One destination to cover all your homework and assignment needs
Learn Practice Revision Succeed
Instant 1:1 help, 24x7
60, 000+ Expert tutors
Textbook solutions
Big idea maths, McGraw-Hill Education etc
Essay review
Get expert feedback on your essay
Schedule classes
High dosage tutoring from Dedicated 3 experts
Practice more questions from Chemistry (Lakhmir Singh)
Q1
Question 80:
A liquid compound X of molecular mass 18 u can be obtained from a number of natural sources. All the animals and plants need liquid X for their survival. When an electric current is passed through 200 grams of pure liquid X under suitable conditions, then 178 grams of gas Y and 22 grams of gas Z are produced. Gas Y is produced at the positive electrode whereas gas Z is obtained at the negative electrode. moreover, gas Y supports combustion whereas gas Z burns itself causing explosions.
(a) Name (i) liquid X (ii) gas Y, and (iii) gas Z.
(b) What is the ratio of the mass of element Z to the mass of element Y in the liquid X ?
(c) Which law of chemical combination is illustrated by this example ?
(d) Name two sources of liquid X.
(e) State an important use of Y in our life
(a) Name (i) liquid X (ii) gas Y, and (iii) gas Z.
(b) What is the ratio of the mass of element Z to the mass of element Y in the liquid X ?
(c) Which law of chemical combination is illustrated by this example ?
(d) Name two sources of liquid X.
(e) State an important use of Y in our life
Q2
Question 81:
One of the forms of a naturally occurring solid compound P is usually used for making the floors of houses. On adding a few drops of dilute hydrochloric acid to P, brisk effervescence are produced. When 50 g of reactant P was heated strongly, than 22 g of a gas Q and 28 g of a solid R were produced as products. Gas Q is the same which produced brisk effervescence on adding dilute HCl to P. Gas Q is said to cause global warming whereas solid R is used for white-washing.
(a) What is (i) solid P (ii) gas Q, and (iii) solid R.
(b) What is the total mass of Q and R obtained from 50 g of P ?
(c) How does the total mass of Q and R formed compare with the mass of P taken ?
(d) What conclusion do you get from the comparison of masses of products and reactant ?
(e) Which law of chemical combination is illustrated by the example given in this problem ?
(a) What is (i) solid P (ii) gas Q, and (iii) solid R.
(b) What is the total mass of Q and R obtained from 50 g of P ?
(c) How does the total mass of Q and R formed compare with the mass of P taken ?
(d) What conclusion do you get from the comparison of masses of products and reactant ?
(e) Which law of chemical combination is illustrated by the example given in this problem ?
Q3
Question 1:
What do we call those particles which have more or less electrons than the normal atoms ?
View allPractice questions from Chemistry (Lakhmir Singh)
Question 1
Views: 5,434
The symbol of element cobalt is CO.
Question 2
Views: 5,901
(Atomic masses : C = 12 u ; H = 1 u ; O = 16 u)
Question 3
Views: 5,552
(a) What will be the formula of its iodide ?
(b) What will be the formula of its nitride ?
(c) What will be the formula of its phosphate ?
Question 4
Views: 5,853
(a) copper
(b) iron
(c) mercury
(d) sulphur
Practice more questions from Atoms and Molecules
Question 2
Views: 5,150
Explain Why:
(a) These isotopes have almost identical chemical properties.
(b) They are electrically neutral.
Practice questions on similar concepts asked by Filo students
Question 2
Views: 5,587
Question 3
Views: 5,482
Stuck on the question or explanation?
Connect with our Science tutors online and get step by step solution of this question.
231 students are taking LIVE classes
| Question Text | Question 81:
One of the forms of a naturally occurring solid compound P is usually used for making the floors of houses. On adding a few drops of dilute hydrochloric acid to P, brisk effervescence are produced. When 50 g of reactant P was heated strongly, than 22 g of a gas Q and 28 g of a solid R were produced as products. Gas Q is the same which produced brisk effervescence on adding dilute HCl to P. Gas Q is said to cause global warming whereas solid R is used for white-washing. (a) What is (i) solid P (ii) gas Q, and (iii) solid R. (b) What is the total mass of Q and R obtained from 50 g of P ? (c) How does the total mass of Q and R formed compare with the mass of P taken ? (d) What conclusion do you get from the comparison of masses of products and reactant ? (e) Which law of chemical combination is illustrated by the example given in this problem ? |
| Topic | Atoms and Molecules |
| Subject | Science |
| Class | Class 9 |
| Answer Type | Text solution:1 |
| Upvotes | 20 |
