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Q. No.Which of the following statements about a compound is incorrect?
| 1. | A molecule of a compound has atoms of different elements. |
| 2. | A compound cannot be separated into its constituent elements by the physical method of separation. |
| 3. | A compound retains the physical properties of its constituent elements. |
| 4. | The ratio of atoms of different elements in a compound is fixed. |
Subtopic: Millimole/Equivalent Concept |
63%
Level 2: 60%+
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Match the following physical quantities with units.
| Physical quantity | Unit | ||
| A. | Molarity | (i) | mol kg–1 |
| B. | Molality | (ii) | mol L–1 |
| C. | Pressure | (iii) | Candella |
| D. | Luminous intensity | (iv) | Pascal |
Codes:
| A | B | C | D | |
| 1. | (i) | (iv) | (ii) | (iii) |
| 2. | (ii) | (i) | (iv) | (iii) |
| 3. | (i) | (iv) | (iii) | (ii) |
| 4. | (iv) | (i) | (iii) | (ii) |
Subtopic: Introduction |
93%
Level 1: 80%+
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The prefix peta used in the SI system is:
| 1. | \(10^{15}\) | 2. | \(10^{-15} \) |
| 3. | \(10^{18}\) | 4. | \(10^{-18} \) |
Subtopic: Introduction |
55%
Level 3: 35%-60%
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Match the prefixes given in List-I with their corresponding powers of ten in List-II, and choose the correct option.
Codes:
| List-I | List-II | ||
| a. | Micro | i. | m |
| b. | Mega | ii. | m |
| c. | Giga | iii. | m |
| d. | Femto | iv. | m |
| a | b | c | d | |
| 1. | i | iv | iii | ii |
| 2. | iii | iv | ii | i |
| 3. | ii | iii | iv | i |
| 4. | i | iii | iv | ii |
Subtopic: Introduction |
85%
Level 1: 80%+
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The number of moles of water present in a spherical water droplet of radius 1.0 cm are:
[Given: Density of water in the droplet = 1.0 g cm–3]
1. \( \dfrac{\pi}{18} \)
2. \( \dfrac{2\pi}{27} \)
3. \(24\pi\)
4. \( \dfrac{2\pi}{9} \)
[Given: Density of water in the droplet = 1.0 g cm–3]
1. \( \dfrac{\pi}{18} \)
2. \( \dfrac{2\pi}{27} \)
3. \(24\pi\)
4. \( \dfrac{2\pi}{9} \)
Subtopic: Introduction |
68%
Level 2: 60%+
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Find the Celsius scale reading corresponding to a temperature of 200°F.
1. 40°C
2. 94°C
3. 93°C
4. 30°C
Subtopic: Introduction |
69%
Level 2: 60%+
Hints
Consider the two statements:
| Statement I: | Scientific notation for 0.00016 is \(1.6 \times 10^{-3} \). |
| Statement II: | The volume of water to be added to change the molarity of a 200 mL 0.5 M aqueous solution to 0.1 M is 800 mL. |
| 1. | Statement I is correct, Statement II is correct. |
| 2. | Statement I is incorrect, Statement II is correct. |
| 3. | Statement I is correct, Statement II is incorrect. |
| 4. | Statement I is incorrect, Statement II is incorrect. |
Subtopic: Introduction |
52%
Level 3: 35%-60%
Hints
Which of the following correctly represents 234,000 and 6.0012 in scientific notation?
| 1. | \(2.34 \times 10^{-9} \text { and } 6 \times 10^3\) |
| 2. | \(0.234 \times 10^{-6} \text { and } 60012 \times 10^{-9}\) |
| 3. | \(2.34 \times 10^{-9} \text { and } 6.0012 \times 10^{-9}\) |
| 4. | \(2.34 \times 10^5 \text { and } 6.0012 \times 10^0\) |
Subtopic: Introduction |
84%
Level 1: 80%+
Hints
Subtopic: Introduction |
80%
Level 1: 80%+
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Subtopic: Introduction |
83%
Level 1: 80%+
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