उत्तरों सहित नर्सिंग प्रवेश परीक्षाओं के लिए रसायन विज्ञान वर्कशीट

परमाणु के अन्य कणों की तुलना में किस कण का द्रव्यमान लगभग नगण्य होता है?

1. Aपूरा नाभिक
2. Bन्यूट्रॉन
3. Cइलेक्ट्रॉन
4. Dप्रोटॉन

What is a beta particle?

1. AA helium nucleus with two protons and two neutrons
2. BA neutron that leaves the nucleus
3. CA wave of visible light
4. DA high-energy electron released from a nucleus

What is an unsaturated solution?

1. AA solution with no solute at all
2. BA solution that can still dissolve more solute
3. CA solution that holds the maximum possible solute
4. DA solution with undissolved solid at the bottom

In 2KClO₃ → 2KCl + 3O₂, how many moles of O₂ form from 4 mol of KClO₃?

1. A3 mol
2. B8 mol
3. C6 mol
4. D4 mol

Why does the vapour pressure of a liquid increase as it is heated?

1. AMore molecules have enough energy to escape into the gas phase
2. BThe molecules become heavier and press harder on the surface
3. CThe attractions between the molecules become stronger
4. DThe liquid's volume decreases and squeezes out vapour

At 20 °C, about 36 g of NaCl dissolves in 100 g of water. If 50 g of NaCl is stirred into 100 g of water at 20 °C, what happens?

1. AAll 50 g dissolves
2. BAbout 36 g dissolves and about 14 g stays undissolved
3. CAbout 14 g dissolves and about 36 g stays undissolved
4. DNone of the salt dissolves

When water boils, what is overcome?

1. AThe forces holding the oxygen nucleus together
2. BThe covalent O–H bonds inside each molecule
3. CHydrogen bonds between water molecules
4. DThe ionic bonds between H⁺ and O²⁻

A solution of a strong acid has pH 2. It is diluted with water to 10 times its original volume. What is the new pH?

1. A20
2. B0.2
3. C3
4. D1