उत्तरों सहित नर्सिंग प्रवेश परीक्षाओं के लिए रसायन विज्ञान वर्कशीट

ठोस से सीधे गैस में परिवर्तन को क्या कहते हैं?

1. Aऊर्ध्वपातन (सब्लिमेशन)
2. Bसंघनन
3. Cनिक्षेपण (डिपॉज़िशन)
4. Dगलन

Between which kinds of elements do ionic bonds usually form?

1. AA metal and a nonmetal
2. BTwo nonmetals
3. CTwo identical metals
4. DTwo noble gases

What is the half-life of a radioactive isotope?

1. AThe time taken for the mass of a sample to double in size
2. BHalf the number of protons in the nucleus
3. CHalf the time it takes for all the atoms to decay
4. DThe time taken for half of the radioactive atoms in a sample to decay

A red blood cell is placed in a concentrated (hypertonic) salt solution. What happens?

1. AWater enters the cell, which swells and may burst
2. BWater leaves the cell, which shrinks
3. CSalt leaves the cell, which swells
4. DThe cell stays the same size and shape

Glucose has the molecular formula C₆H₁₂O₆. What is its empirical formula?

1. AC₂H₄O₂
2. BC₆H₁₂O₆
3. CCH₂O
4. DCHO

A bag of 5% (w/v) glucose solution (called 5% dextrose in the US) contains 5 g of glucose per 100 mL. How many grams of glucose are in 1 L?

1. A0.5 g
2. B500 g
3. C50 g
4. D5 g

In the reaction 2Na + Cl₂ → 2NaCl, which substance is the oxidising agent?

1. ANaCl
2. BNa⁺
3. CNa
4. DCl₂

Vitamin C is water-soluble and vitamin D is fat-soluble. What does this suggest about their molecules?

1. ABoth are equally polar
2. BVitamin C is nonpolar, while vitamin D is strongly polar
3. CBoth are ionic compounds
4. DVitamin C is polar, while vitamin D is mostly nonpolar