उत्तरों सहित नर्सिंग प्रवेश परीक्षाओं के लिए रसायन विज्ञान वर्कशीट

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

1. A6 g
2. B12 g
3. C1 g
4. D24 g

In a chemical equation, what are the reactants?

1. AThe new substances formed, written to the right of the arrow
2. BThe starting substances, written to the left of the arrow
3. CThe numbers written in front of each formula
4. DThe catalysts written above the arrow

What is the SI unit of energy?

1. ANewton
2. BKelvin
3. CJoule
4. DWatt

When a nucleus emits a beta particle, how do its mass number and atomic number change?

1. AMass number rises by 1 and atomic number stays the same
2. BBoth fall by 1
3. CMass number falls by 4 and atomic number falls by 2
4. DMass number stays the same and atomic number rises by 1

50 g द्रव्यमान और 20 cm³ आयतन वाली वस्तु का घनत्व क्या है?

1. A1000 g/cm³
2. B70 g/cm³
3. C0.4 g/cm³
4. D2.5 g/cm³

What charge do group 16 elements such as oxygen and sulfur usually have as ions?

1. A2−
2. B2+
3. C6+
4. D1−

Element A has 1 valence electron and element B has 7 valence electrons, both in period 3. Which statement best compares them?

1. AA is a reactive metal and B is a reactive nonmetal
2. BBoth are metalloids
3. CBoth are unreactive because they are in the same period
4. DA is a nonmetal and B is a metal

Why does a sodium ion (Na⁺) have almost the same mass as a sodium atom?

1. AThe only difference is one electron, which has a tiny mass
2. BIons and atoms always have exactly the same mass
3. CThe ion gains a neutron that balances the loss
4. DThe ion has one fewer proton, which has a tiny mass