### Chemistry - Thermodynamics

#### Question - 1

N2+3H2 $\longrightarrow$ 2NH3+22kcal

• A it is an endothermic reaction
• B it is an exothermic reaction
• C system gets heated
• D None of the above

#### Question - 2

2SO2+O2 $\longrightarrow$ 2SO3

In this reaction some of the following facts are observed

I:Surrounding get heated

II:Increase in temperature favours dissociation of SO3 hence,

• A This is an endothermic reaction
• B This is an exothermic reaction
• C Pressure has no effect on this reaction
• D Concentration has no effect on this reaction

#### Question - 3

Dissolution of NH4Cl in H2O is

• A an exothermic reaction
• B an endothermic reaction
• C a reaction with $\Delta H=0$
• D a reaction with $\Delta S=0$

#### Question - 4

A+B+x1 $\longrightarrow$ C+D+X2

Select the correct statement

• A If x1 > x2 the reaction is exothermic
• B If x2> x1 thereaction is endothermic
• C If x2 > x1 exothermic
• D If x2=x1 the reaction is endothermic

#### Question - 5

N2 + O2 $\longrightarrow$ 2NO,$\Delta H$ =43.2kcal

Based on the reaction shown which statement is true?

• A 43.2 kcal are consumed when 1.00g of N2 reacts
• B 43.2 kcal are consumed when 1.00g of O2 reacts
• C 43.2 kcal are consumed when 1.00mol of O2 reacts
• D 43.2 kcal are released when 2.00molof NO are formed

#### Question - 6

If liquid is converted into solid state then

• A heat is observed
• B heat is evolved
• C no enthalpy change
• D heat change depends on nature of solvent

#### Question - 7

For the following reaction, N2+3H2$\rightleftharpoons$ 2NH3

increase in temperature favours dissociation of NH3,hence this reaction is

• A exothermic in forward direction and endothermic in backward direction
• B endothermic in forward direction and exothermic in backward direction
• C exothermic in forward direction
• D endothermic in forward direction

#### Question - 8

Consider the following changes
II: fusion
III: freezing
Iv: vaporisation
Exothermic changes are

• A I,II
• B I,III
• C I,IV
• D II,IV

#### Question - 9

Consider the following changes
II: fusion
III: freezing
Iv: vaporisation
Endothermic changes in above are

• A II,III
• B III,IV
• C I,II
• D II,IV

#### Question - 10

Consider the following reactions
I:C(graphite)+O2(g) $\longrightarrow$ CO2(g); $\Delta H^0=-x_1 cal$
II:CO(g)+$1\over2$O2(g) $\longrightarrow$ CO2(g); $\Delta H^0=-x_2 cal$
Based on the above data,$\Delta H^0_f(CO_2)$is

• A -x1 cal
• B -x2 cal
• C (x2-x1)cal
• D (x1-x2)cal