Study of Gas Laws Exe-7 Very Short Answer Chemistry Class-9 ICSE Selina Publishers Solutions Chapter-7. Step By Step ICSE Selina Concise Solutions of Chapter-7 Study of Gas Laws with All Exercise including MCQs, Very Short Answer Type, Short Answer Type, Long Answer Type, Numerical and Structured/Application Questions Solved . Visit official Website CISCE for detail information about ICSE Board Class-9.
Study of Gas Laws Exe-7 Very Short Answer Chemistry Class-9 ICSE Concise Selina Publishers
| Board | ICSE |
| Publications | Selina Publication |
| Subject | Chemistry |
| Class | 9th |
| Chapter-7 | Study of Gas Laws |
| Book Name | Concise |
| Topics | Solution of Exercise – 7 Very Short Answer Type |
| Academic Session | 2023-2024 |
B. Exercise – 7 Very Short Answer Type
Study of Gas Laws Class-9 Chemistry Concise Solutions
Page-131
Question 1.
Match the following:
| Column A | Column B | |
| (a) | cm3 | (i) Pressure |
| (b) | Kelvin | (ii) Temperature |
| (c) | Torr | (iii) Volume |
| (d) | Boyle’s law | |
| (e) | Charles’s law | |
Answer:
| Column A | Column B |
| (a) cm3 | Volume |
| (b) Kelvin | Temperature |
| (c) Torr | Pressure |
| (d) Boyle’s law | PV = P1 V1
|
| (e) Charles’s law |
Question 2.
Fill in the blanks:
(a) The average kinetic energy of the molecules of a gas is proportional to the ………….
(b) The temperature on the Kelvin scale at which molecular motion completely ceases is called……………
(c) If temperature is reduced to half, ………….. would also reduce to half.
(d) The melting point of ice is …………. Kelvin.
Answer:
(a) Absolute temperature
(b) Absolute zero
(c) Volume
(d) 273
B. Exercise – 7 Very Short Answer Type
Study of Gas Laws Class-9 Chemistry Concise Solutions
Page-132
Question 3.
Correct the following statements:
(a) Volume of a gas is inversely proportional to its pressure at constant temperature.
(b) Volume of a fixed mass of a gas is directly proportional to its temperature, pressure remaining constant.
(c) 0°C is equal to zero Kelvin.
(d) Standard temperature is 25°C.
(e) Boiling point of water is 273 K.
Answer:
(a) Volume of a gas is directly proportional to the pressure at constant temperature.
(b) Volume of a fixed mass of a gas is inversely proportional to the temperature, the pressure remaining constant.
(c) -273°C is equal to zero Kelvin.
(d) Standard temperature is 0°C.
(e) The boiling point of water is -373 K.
Question 4.
State:
(i) the three variables for gas laws and
(ii) SI units of these variables.
Answer:
(i) Three variables for gas laws: Volume (V), Pressure (P), Temperature (T)
(ii) SI units of these variables:
For volume: Cubic meter (m3)
and For pressure: Pascal (Pa)
For temperature: Kelvin (K)
Question 5.
Write the value of:
(a) Standard temperature in:
(i) °C (ii) K
(b) Standard pressure in:
(i) atm (ii) mm Hg (iii) cm Hg (iv) torr
Answer:
(a) Standard temperature
(i) 0°C (ii) 273 K
(b) Standard pressure
(i) 1 atmospheric pressure (atm)
(ii) 760 mm Hg
(iii) 76 cm of Hg
(iv) 760 torr
Question 6.
State the following:
(a) Volume of a gas at 0 Kelvin
(b) Absolute temperature of a gas at 7°C
(c) Gas equation
(d) Ice point in absolute temperature
(e) STP conditions
Answer:
(a) Volume of gas is zero.
(b) Absolute temperature is 7 + 273 = 280 K.
(c) The gas equation is
(d) Ice point = 0 + 273 = 273 K
(e) Standard temperature is taken as 273 K or O°C.
Standard pressure is taken as 1 atmosphere (atm) or 760 mmHg.
— : End of Study of Gas Laws Exe-7 Very Short Answer Class-9 ICSE Chemistry Solutions :–
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