FREE GACE Chemistry Test Questions and Answers

Question 1

Which substance has the greatest chance of being a solid at STP?

Accepted Answer

Na

Answer

Kr

Answer

Xe

Answer

NH3

Question 2

Which of the following actions might raise a solution's freezing point?
I. Divide the mixture between two different containers. 
II. To boil off some of the solvent, heat the solution.
III. Start a reaction that will result in some of the solute precipitating.

Accepted Answer

III

Answer

I and III

Answer

II

Answer

I and II

Question 3

Cooling occurs to a gas with constant volume. Which gas-related claim must be accurate?

Accepted Answer

The gas molecules' kinetic energy has decreased.

Answer

The gas now has a higher density.

Answer

The gas is now lighter than before.

Answer

A liquid has formed from the gas.

Question 4

At STP, two moles of hydrogen and one mole of oxygen gas are mixed together in a closed container. Which of the ensuing assertions is accurate?

Accepted Answer

Greater than partial pressure of oxygen is partial pressure of hydrogen.

Answer

Two moles of water will be produced by the reaction of the hydrogen and oxygen.

Answer

More hydrogen is present than oxygen in terms of volume.

Answer

Gaseous hydrogen is heavier than oxygen in terms of mass.

Question 5

What link between two different materials can be best determined using Graham's law?

Accepted Answer

Mass and Diffusion Rate

Answer

Diffusion Rate and Temperature

Answer

Volume and Temperature

Answer

Pressure and Volume

Question 6

Which is the proper sequence for increasing the attraction forces between molecules?

Accepted Answer

London dispersion < Dipole - dipole < Hydrogen bonding < Ionic

Answer

Ionic < Dipole - dipole <London dispersion < Hydrogen bonding

Answer

Hydrogen bonding < London dispersion < Ionic < Dipole - dipole

Answer

Dopile - dipole < ionic < hydrogen bonding < London dispersion

Question 7

At 25 °C and 101 kPa of pressure, 1,000 mol of He gas is inflated into a weather balloon. What is the weather balloon's volume?

Accepted Answer

24.5 m3

Answer

2 m3

Answer

245 m3

Answer

24, 518 m3

Question 8

A mole of an ideal gas is heated to 25 °C and compressed to 10 L. What is the gas's pressure?

Accepted Answer

2.4 atm

Answer

0.2 atm

Answer

2.4 KPa

Answer

0.2 KPa

Question 9

4 moles of oxygen, 3 moles of nitrogen, and 7 moles of neon are present in a 10 L cylinder. The cylinder's temperature is raised from 20°C to 40°C. Calculate the percentage of the total neon partial pressure in the cylinder.

Accepted Answer

50%

Answer

70%

Answer

40%

Answer

90%

Question 10

Each flask containing the three liquids X, Y, and Z is suspended in a water bath that is 75°C. Each liquid's boiling point is as follows:
Z, 360 K  
X, 273 K
Y, 340 K
Which of the three liquids will reach boiling point at a temperature of 75 °C?

Accepted Answer

X and Y

Answer

Y and Z

Answer

X and Z

Answer

X, Y and Z