उत्तरों सहित नर्सिंग प्रवेश परीक्षाओं के लिए रसायन विज्ञान वर्कशीट

Which element exists naturally as diatomic molecules (two atoms joined together)?

1. AIron
2. BHelium
3. COxygen
4. DSodium

What is absolute zero?

1. A0 °F, the temperature of a salt and ice mixture
2. B0 K, about −273 °C, the lowest possible temperature
3. C0 °C, the point at which pure water freezes into ice
4. D−100 °C, the coldest temperature on Earth

According to the Arrhenius definition, what does an acid produce in water?

1. AOxide ions (O²⁻)
2. BHydrogen ions (H⁺)
3. CHydroxide ions (OH⁻)
4. DSodium ions (Na⁺)

A patient's arterial blood pH is 7.25. How is this described?

1. ANeutral
2. BNormal
3. CAcidosis
4. DAlkalosis

Which coefficients balance __Na + __Cl₂ → __NaCl?

1. A1, 2, 1
2. B2, 1, 2
3. C1, 1, 1
4. D2, 2, 1

Why does stirring help a solid dissolve faster?

1. AIt raises the temperature of the solvent by friction a great deal
2. BIt increases the amount of solute that can dissolve in total
3. CIt brings fresh solvent into contact with the solid's surface
4. DIt turns the solid into a liquid

A gas occupies 4 L at 2 atm and 200 K. What is its volume at 1 atm and 400 K?

1. A16 L
2. B1 L
3. C4 L
4. D8 L

An isotope has a half-life of 8 days. How long does it take for 100 g to decay to 12.5 g?

1. A16 days
2. B32 days
3. C24 days
4. D64 days