उत्तरों सहित नर्सिंग प्रवेश परीक्षाओं के लिए रसायन विज्ञान वर्कशीट

What does the subscript 2 in H₂O tell you?

1. AThere are two water molecules
2. BWater has a charge of 2
3. CEach molecule contains two oxygen atoms
4. DEach molecule contains two hydrogen atoms

What is an alpha particle made of?

1. A2 protons and 2 neutrons
2. BA single high-energy electron
3. CPure electromagnetic energy
4. D1 proton and 1 electron

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 with the largest mass
4. DThe reactant that is left over at the end

बफ़र विलयन क्या करता है?

1. Aउदासीनीकरण अभिक्रियाओं को तेज़ करता है ताकि pH शीघ्र ठीक 7 हो जाए
2. Bविलयन का तापमान स्थिर रखता है
3. Cथोड़ा अम्ल या क्षार मिलाने पर pH के परिवर्तन का प्रतिरोध करता है
4. Dकिसी भी अम्ल को प्रबल क्षार में बदल देता है

How does ionisation energy (the energy needed to remove an outer electron) generally change from left to right across a period?

1. AIt decreases
2. BIt first falls, then rises sharply
3. CIt increases
4. DIt stays the same

Which measurement has three significant figures?

1. A0.0056
2. B56
3. C5.0006
4. D0.00560

The true volume in a flask is 10.0 mL. A student measures it three times and gets 8.1 mL, 8.1 mL and 8.2 mL. How are these results best described?

1. ANeither accurate nor precise
2. BBoth accurate and precise
3. CPrecise but not accurate
4. DAccurate but not precise

In the fission reaction ²³⁵U + ¹n → ¹⁴¹Ba + ⁹²Kr + ? ¹n, how many neutrons are released?

1. A3
2. B1
3. C4
4. D2