Fsc Part 1 Chemistry MCQ's Test For Full Book With Answers

Fsc Part 1 Chemistry MCQ's Test For Full Book

Sr. # Questions Answers Choice
1 The SI unit of enthalpy Calorie eV kj mol-1 J mol-1
2 Delta H for an endothermic reaction is Positive Negative Zero Depends on temperature
3 Which of the following is always negative in an exothermic reaction. Delta H Activation energy Entropy  Delta S
4 Consider a reaction with Delta H > 0 and Delta S<0 this reaction will be Spontaneous at all temperaturres Non spontaneous at all temperature Spontaneous only at high temperatures Spontaneous only atlow temperature
5 The enthalpy change for a reaction depends on. Pathway taken from reactants to products Presence of a catalyst Intitial and final states of the reactants and products Rate of the reaction
6 Which of the followng factors would lead to a greater enthalpy chage of hydration . A larger ionic reduis and a smaller charge A smaller ionic radius and a smaller charge A larger ionic radius and a larger charge A smaller ionic radius and alarger charge
7 Which of the followng quantitites is NOT typically determined using Hess's Law. Enthalpy change of formation  Activation energy Enthalpy chage f combustion Enthalpy chage of reaction 
8 The calorie content of food, often expressed in Calories (keal), is fundamentally related to which thermodynamic quantity during its metabolism or combustion. Enthealpy change Entropy change Gibbs free engnergy change Specific heat capacity
9 Suppose there are 100 molecules of a gas initially in jar A, which is connected to an evacuated jar B, When the stopcock is opened, the positive ways of arrangement of molecules will be  100 1/100 2/100 1/2 
10

Liquid crystals are used in thermometers becasue.

 <p>They arehighly reflective</p> <p>They glow at high temperatures</p> <p>Their color changes with temperature</p> <p>They conduct electricity</p>
11

Which of the following is NOT a property of liqud crystals.

 <p>Fludity</p> <p>Rigidity like crystals</p> <p>Complete isotropy</p> <p>Viscosity</p>
12

Why are cholestric liuquid crystals useful in medical diagonostics.

 <p>They kill bacteria</p> <p>They reat with tumors chemically</p> <p>They detect temperatur edifferences</p> <p>They absorb X -rays</p>
13

Which of the following is a unique optical property of liquid crystals.

 <p>They reflect ultravolet light</p> <p>They are always opaque</p> <p>They are anisotropic</p> <p>They are isotropic</p>
14

Liquid crystals exhibit properties of

 <p>Only solid</p> <p>Only liquid</p> <p>Both solids and liquids</p> <p>Gases and solids</p>
15

What typ of molecular shape in communly found in liquid crystals.

 <p>Spherical</p> <p>Rod like and elongated</p> <p>Spiral</p> <p>Cubic</p>
16

Which of the followign best describes the molecular arrangemetn in liquid crystals.

 <p>Random and disordered</p> <p>Fixed in all direcions</p> <p>Parallel and partically ordered</p> <p>Compleely rigid and fixed</p>
17

What happens to the shae of a NaCl crystal when 10% urea is present in its solution.

 <p>It becomes needle like</p> <p>It becomes larger</p> <p>It reamains the same</p> <p>It becomes cubic</p>
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