Assertion and Reason Questions for Class 11 Chemistry Chapter 5 States of Matter
(a) Assertion and reason both are correct statements and reason is correct explanation for assertion.
(b) Assertion and reason both are correct statements but reason is not correct explanation for assertion.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
Q.1. Assertion : The plot of volume (V) versus pressure (P) at constant temperature is a hyperbola in the first quadrant.
Reason : V ∝ 1/P at constant temperature.
Q.2. Assertion : Compressibility factor (Z) for for non ideal gases is always greater than 1.
Reason : The gases which lave Z > 1 are difficult to compress.
AnswerAnswer: (d) : Compressibility factor (Z ) can be greater, equal or lesser than 1.
Q.3. Assertion : Vapour pressure of NH3 is higher than C2H5OH.
Reason : H-bonding is observed in both the molecules.
AnswerAnswer:(b) : H – bonding in liquid NH3 is weaker than C2H5OH. Thus, escaping tendency is higher and hence, the vapour pressure of NH3 is also higher.
Q.4. Assertion : The graph between P v/s 1/V is a straight line.
Reason : At constant temperature, P ∝ 1/V.
Q.5. Assertion : Three states of matter are the result of balance between intermolecular forces and thermal energy of the molecules.
Reason : Intermolecular forces tend to keep the molecules together but thermal energy of molecules tends to keep them apart.
Q.6. Assertion : van der Waals equation is applicable only to non-ideal gases.
Reason : Ideal gases obey the equation PV = nRT.
AnswerAnswer: (b) : The van der Waals equation is applicable to real gases only, while PV = nRT is applicable to ideal gases.
Q.7. Assertion : At constant temperature, PV vs V plot for real gases is not a straight line.
Reason : At high pressure all gases have Z > 1 but at intermediate pressure most gases have Z<1.