उत्तरों सहित नर्सिंग प्रवेश परीक्षाओं के लिए रसायन विज्ञान वर्कशीट

What is the maximum number of electrons the first electron shell can hold?

1. A1
2. B18
3. C2
4. D8

In a chemical reaction, what is the limiting reactant?

1. AThe catalyst that controls the speed
2. BThe reactant that runs out first and stops the reaction
3. CThe reactant that is left over at the end
4. DThe reactant with the largest mass

Plants absorb energy from sunlight during photosynthesis. How is photosynthesis classified?

1. AEndothermic
2. BNeutralisation
3. CExothermic
4. DNuclear

What are London dispersion forces?

1. AWeak, temporary attractions caused by shifting electrons in molecules
2. BForces that hold protons together in the nucleus
3. CStrong bonds formed by transferring electrons
4. DAttractions between a hydrogen atom and a metal ion

Water has a high specific heat capacity. How does this help the human body?

1. AIt makes the blood more acidic
2. BIt helps keep body temperature stable
3. CIt allows oxygen to dissolve in water more easily
4. DIt makes water a poor solvent for salts

How many molecules are in 2 mol of carbon dioxide?

1. A6.02 × 10²³
2. B3.01 × 10²³
3. C1.20 × 10²⁴
4. D2.00 × 10²³

Which statement correctly distinguishes a scientific law from a scientific theory?

1. ALaws apply only to chemistry, theories only to biology
2. BA law describes what happens; a theory explains why it happens
3. CA theory becomes a law once it is proved
4. DA law is only a guess, while a theory is a proven fact

An unknown element is shiny, conducts electricity, and reacts vigorously with water to form a basic solution and hydrogen gas. In which group is it most likely?

1. AGroup 14 (carbon group)
2. BGroup 1 (alkali metals)
3. CGroup 17 (halogens)
4. DGroup 18 (noble gases)