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Nursing Question Bank

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1265 available questions

Chemistry · Question 101

Which element has the highest electronegativity on the Pauling scale?

  1. Oxygen
  2. Chlorine
  3. Nitrogen
  4. Fluorine
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Correct answer: D

Fluorine

Fluorine has the highest Pauling electronegativity.

Chemistry · Question 102

What is the molecular shape of ammonia, NH3?

  1. Trigonal planar
  2. Trigonal pyramidal
  3. Tetrahedral
  4. Linear
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Correct answer: B

Trigonal pyramidal

Nitrogen has three bonding pairs and one lone pair. The molecular shape is trigonal pyramidal.

Chemistry · Question 103

What is the approximate H-O-H bond angle in a water molecule?

  1. 180 degrees
  2. 90 degrees
  3. 104.5 degrees
  4. 120 degrees
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Correct answer: C

104.5 degrees

The two lone pairs on oxygen reduce the bond angle to approximately 104.5 degrees.

Chemistry · Question 104

For a fixed amount of gas at constant temperature, Boyle's law states that pressure is:

  1. Directly proportional to volume
  2. Inversely proportional to volume
  3. Independent of volume
  4. Proportional to volume squared
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Correct answer: B

Inversely proportional to volume

Boyle's law gives PV = constant, so pressure rises when volume falls.

Chemistry · Question 105

What is the approximate value of the molar gas constant R in J mol^-1 K^-1?

  1. 1.38
  2. 8.314
  3. 22.4
  4. 0.0821
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Correct answer: B

8.314

In these units, R is approximately 8.314 J mol^-1 K^-1.

Chemistry · Question 106

What temperature on the Celsius scale corresponds to absolute zero?

  1. -273.15 degrees C
  2. 273.15 degrees C
  3. 0 degrees C
  4. -100 degrees C
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Correct answer: A

-273.15 degrees C

Zero kelvin corresponds to -273.15 degrees Celsius.

Chemistry · Question 107

Which is a colligative property of a dilute solution?

  1. Osmotic pressure
  2. Colour
  3. Viscosity
  4. Surface tension
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Correct answer: A

Osmotic pressure

Osmotic pressure depends on the concentration of dissolved particles rather than their chemical identity in the ideal dilute limit.

Chemistry · Question 108

When time is measured in seconds, what is the unit of a first-order reaction rate constant?

  1. s^-1
  2. mol L^-1 s^-1
  3. L mol^-1 s^-1
  4. s
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Correct answer: A

s^-1

In rate = k[A], dividing concentration per second by concentration leaves inverse seconds.

Chemistry · Question 109

How does a catalyst increase the rate of a chemical reaction?

  1. By providing a pathway with lower activation energy
  2. By changing the equilibrium constant
  3. By being permanently consumed
  4. By increasing activation energy
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Correct answer: A

By providing a pathway with lower activation energy

A catalyst provides an alternative pathway with a lower activation barrier and is regenerated.

Chemistry · Question 110

Assuming complete dissociation and ideal dilute behaviour, what is the pH of 0.01 M HCl?

  1. 7
  2. 12
  3. 1
  4. 2
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Correct answer: D

2

The hydrogen ion concentration is approximately 10^-2 M, so pH = -log10(10^-2) = 2.