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एक उदासीन परमाणु में 11 प्रोटॉन हैं। उसमें कितने इलेक्ट्रॉन हैं?

1. A12
2. B22
3. C11
4. D10

Carbon has an atomic mass of 12. What is the mass of 1 mole of carbon atoms?

1. A24 g
2. B12 g
3. C6 g
4. D1 g

What causes the pressure of a gas in a container?

1. AThe weight of the container pressing on the gas inside
2. BGas particles stopping and pushing outward
3. CGas particles colliding with the container walls
4. DGas particles sticking to the walls

What is the molar mass of calcium carbonate, CaCO₃ (Ca = 40, C = 12, O = 16 g/mol)?

1. A68 g/mol
2. B100 g/mol
3. C116 g/mol
4. D84 g/mol

How does evaporation differ from boiling?

1. AEvaporation produces a solid, while boiling produces a gas
2. BEvaporation happens only at the surface and at any temperature; boiling happens throughout the liquid at a set temperature
3. CEvaporation happens throughout the liquid at a set temperature; boiling happens only at the surface
4. DEvaporation needs a higher temperature than boiling

What percentage of the mass of water (H₂O, 18 g/mol) is hydrogen (H = 1 g/mol)?

1. AAbout 89%
2. BAbout 5.6%
3. CAbout 11%
4. DAbout 67%

CO₂ in blood forms carbonic acid: CO₂ + H₂O ⇌ H₂CO₃ ⇌ H⁺ + HCO₃⁻. An anxious patient hyperventilates and breathes off extra CO₂. What happens to blood pH?

1. AIt stays exactly 7.40, because CO₂ does not affect pH
2. BIt rises, because less CO₂ means fewer H⁺ ions
3. CIt falls, because oxygen is an acid
4. DIt falls, because less CO₂ means more H⁺ ions

Why does atomic radius decrease from left to right across a period?

1. AEach element adds a new electron shell
2. BNeutrons push the electrons outward less strongly
3. CThe atoms lose electrons across the period
4. DMore protons pull the electrons of the same outer shell closer