11th Chemistry - Book Back Answers - Unit 6 - English Medium Guides

 

 

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Tamil Nadu Board 11th Standard Chemistry - Unit 6 : Book Back Answers and Solutions

    This post covers the book back answers and solutions for Unit 6 – Chemistry from the Tamil Nadu State Board 11th Standard Chemistry textbook. These detailed answers have been carefully prepared by our expert teachers at KalviTips.com.

    We have explained each answer in a simple, easy-to-understand format, highlighting important points step by step under the relevant subtopics. Students are advised to read and memorize these subtopics thoroughly. Once you understand the main concepts, you’ll be able to connect other related points with real-life examples and confidently present them in your tests and exams.

    By going through this material, you’ll gain a strong understanding of Chemistry Unit 6 along with the corresponding book back questions and answers (PDF format).

Question Types Covered:

• 1 Mark Questions: Choose the correct answer, Fill in the blanks, Identify the correct statement, Match the following 
• 2 Mark Questions: Answer briefly 
• 3, 4, and 5 Mark Questions: Answer in detail

All answers are presented in a clear and student-friendly manner, focusing on key points to help you score full marks.

All the best, Class 11 students! Prepare well and aim for top scores. Thank you!

Unit 6 :GASEOUS STATE

I. Choose the best answer.

1. Gases deviate from ideal behavior at high pressure. Which of the following statement(s) is correct for non-ideality?
a) at high pressure the collision between the gas molecule become enormous
b) at high pressure the gas molecules move only in one direction
c) at high pressure, the volume of gas become insignificant
d) at high pressure the intermolecular interactions become significant

Answer Key:

d) at high pressure the intermolecular interactions become significant

  
2. Rate of diffusion of a gas is
a) directly proportional to its density
b) directly proportional to its molecular weight
c) directly proportional to its square root of its molecular weight
d) inversely proportional to the square root of its molecular weigh

Answer Key: 

d) inversely proportional to the square root of its molecular weigh 

3. Which of the following is the correct expression for the equation of state of van der Waals gas?

(a) 

(b)

(c) 

(d)

Answer Key:$$

(c) 

$$

$<b>4.\; When\; an\; ideal\; gas\; undergoes\; unrestrained\; expansion,\; no\; cooling\; occurs\; because\; the\; molecules</b><br>a)\; are\; above\; inversion\; temperature<br>b)\; exert\; no\; attractive\; forces\; on\; each\; other<br>c)\; do\; work\; equal\; to\; the\; loss\; in\; kinetic\; energy<br>d)\; collide\; without\; loss\; of\; energy$

Answer Key:$$

$b)\; exert\; no\; attractive\; forces\; on\; each\; other$

$$

$<b>5.\; Equal\; weights\; of\; methane\; and\; oxygen\; are\; mixed\; in\; an\; empty\; container\; at\; 298\; K.\; The\; fraction\; of\; total\; pressure\; exerted\; by\; oxygen\; is </b>$

(a) 1/3

(b) 1/2

(c) 2/3

(d)$\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$3$}\right.\mathrm{x}273\mathrm{x}298$

Answer Key:$\mathrm{ }$

(a) 1/3

 

$\mathrm{<b>6.\; The\; temperature\; at\; which\; real\; gases\; obey\; the\; ideal\; gas\; laws\; over\; a\; wide\; range\; of\; pressure<br>is\; called</b><br>a)\; Critical\; temperature <br>b)\; Boyle\; temperature<br>c)\; Inversion\; temperature <br>d)\; Reduced\; temperature}$

Answer Key:
$\mathrm{b)\; Boyle\; temperature}$

$\mathrm{ }$
$\mathrm{<b>7.\; In\; a\; closed\; room\; of\; 1000 </b>}$m³$\mathrm{<b> a\; perfume\; bottle\; is\; opened\; up.\; The\; room\; develops\; a\; smell.\; This\; is\; due\; to\; which\; property\; of\; gases?</b><br>a)\; Viscosity <br>b)\; Density<br>c)\; Diffusion <br>d)\; None}$

Answer Key:
$\mathrm{c)\; Diffusion }$

$\mathrm{ }$
$\mathrm{<b>8.\; A\; bottle\; of\; ammonia\; and\; a\; bottle\; of\; HCl\; connected\; through\; a\; long\; tube\; are\; opened\; simultaneously\; at\; both\; ends.\; The\; white\; ammonium\; chloride\; ring\; first\; formed\; will\; be</b><br>a)\; At\; the\; center\; of\; the\; tube<br>b)\; Near\; the\; hydrogen\; chloride\; bottle<br>c)\; Near\; the\; ammonia\; bottle<br>d)\; Throughout\; the\; length\; of\; the\; tube}$

Answer Key:
$\mathrm{b)\; Near\; the\; hydrogen\; chloride\; bottle}$

$\mathrm{ }$
$\mathrm{<b>9.\; The\; value\; of\; universal\; gas\; constant\; depends\; upon</b><br>a)\; Temperature\; of\; the\; gas <br>b)\; Volume\; of\; the\; gas<br>c)\; Number\; of\; moles\; of\; the\; gas <br>d)\; units\; of\; Pressure\; and\; volume }$ 

Answer Key: 

$\mathrm{d)\; units\; of\; Pressure\; and\; volume}$

$\mathrm{ }$ 

10. The value of the gas constant R is

a) 0.082 dm³atm.

b) 0.987 cal mol^-1 K^-1

c) 8.3 J mol^-1K^-1

d) 8 erg mol^-1K^-1

Answer Key: 

c) 8.3 J mol^-1K^-1

  

11. Use of hot air balloon in sports and meteorological observation is an application of
a) Boyle's law
b) Newton's law
c) Kelvin's law
d) Brown's law

Answer Key: 

a) Boyle's law 

12. The table indicates the value of van der Waals constant 'a' in (dm³)²atm. mol^-2

The gas which can be most easily liquefied is

a) O₂

b) N₂

c) NH₃

d) CH₄

Answer Key: 

c) NH₃

  

13. Consider the following statements

i) Atmospheric pressure is less at the top of a mountain than at sea level

ii) Gases are much more compressible than solids or liquids

iii) When the atmospheric pressure increases the height of the mercury column rises Select the correct statement

a) I and II

b) II and III

c) I and III

d) I, II and III

Answer Key: 

d) I, II and III

  

14. Compressibility factor for CO₂ at 400 K and 71.0 bar is 0.8697. The molar volume of CO₂ under these conditions is

a) 22.04dm³

b) 2.24 dm³

c) 0.41 dm³

d) 19.5 dm³ 

Answer Key: 

c) 0.41 dm³

  

15. If temperature and volume of an ideal gas is increased to twice its values, the initial pressure P becomes
a) 4P
b) 2P
c) P
d) 3P

Answer Key: 

c) P

  

16. At identical temperature and pressure, the rate of diffusion of hydrogen gas is 3$\sqrt{3}$  times that of a hydrocarbon having molecular formula C _n H _{2n - 2}. What is the value of n?
a) 8
b) 4
c) 3
d) 1

Answer Key:
b) 4

 
17. Equal moles of hydrogen and oxygen gases are placed in a container, with a pin-hole through which both can escape what fraction of oxygen escapes in the time required for one-half of the hydrogen to escape. (NEET phase I)
a) 3/8
b) 1/2
c) 1/8
d) 1/4

Answer Key: 

c) 1/8

  

18. The variation of volume V, with temperature T, keeping pressure constant is called the coefficient of thermal expansion ie $\mathrm{\alpha }=\frac{1}{\mathrm{V}}$$\left(\begin{array}{c}\mathrm{<math\; xmlns="http://www.w3.org/1998/Math/MathML"><mi\; mathvariant="normal"><math\; xmlns="http://www.w3.org/1998/Math/MathML"><mfrac><mrow><mo>\partial </mo><mi\; mathvariant="normal">V</mi></mrow><mrow><mo>\partial </mo><mi\; mathvariant="normal">T</mi></mrow></mfrac></math></mi></math>}\end{array}\right)$_p For an ideal gas a is equal to 
a) T
b) 1/T
c) P

d) none of these

Answer Key:
b) 1/T

 
19. Four gases P, Q, R and S have almost same values of 'b' but their 'a' values (a, b are Vander Waals Constants) are in the order Q < R < S < P At a particular temperature, among the four gases the most easily liquefiable one is
a) P
b) Q
c) R
d) S

Answer Key:
a) P

 
20. Maximum deviation from ideal gas is expected from (NEET)

a) CH₄(g)

b) NH₃(g)

c) H₂g)

d) N₂(g)

Answer Key: 

b) NH₃(g)

 

21. The units of Vander Waals constants 'b' and 'a' respectively

a) mol L^{- 1} and Lat m²  mol  ^{- 1}

b) mol L and L atm mol

c) mol L and L³ atm mol

d) none of these

Answer Key:

c) mol L and L³ atm mol 

22. Assertion: Critical temperature of CO₂, is 304K, it can be liquefied above 304K.
Reason: For a given mass of gas, volume is to directly proportional to pressure at constant temperature
a) both assertion and reason are true and reason is the correct explanation of asser-tion
b) both assertion and reason are true but reason is not the correct explanation of assertion
c) assertion is true but reason is false
d) both assertion and reason are false

Answer Key:
d) both assertion and reason are false

 
23. What is the density of N2, gas at 227°C and 5.00 atm pressure? (R = 0.082 L atm K-1 mol  ^{- 1})
a) 1.40 g/L
b) 2.81 g/L
c) 3.41 g/L
d) 0.29 g/L

Answer Key:
c) 3.41 g/L

 
24. Which of the following diagrams correctly describes the behaviour of a fixed mass of an ideal gas? (T is measured in K)

Answer Key:

25. 25g of each of the following gases are taken at 27°C and 600 mm Hg pressure. Which of these will have the least volume?
a) HBr
b) HCl
c) HF
d) HI

Answer Key:
d) HI 

 

 

II. Short Answer Questions 

11th Chemistry

III. Long Answer Questions

11th Chemistry

IV. Exercise

11th Chemistry