Q. No.1. \(24~\text{g}~\text{of}~C~(12)\)
2. \(56~\text{g}~\text{of}~Fe~(56)\)
3. \(27~\text{g}~\text{of}~Al~(27)\)
4. \(108~\text{g}~\text{of}~Ag~(108)\)
| Column-I | Column-II | ||
| (A) | 28 g of He | (i) | 2 moles |
| (B) | 46 g of Na | (ii) | 7 moles |
| (C) | 60 g of Ca | (iii) | 1 mole |
| (D) | 27 g of Al | (iv) | 1.5 moles |
1. (A)→(iv), (B)→(iii), (C)→(ii), (D)→(i)
2. (A)→(i), (B)→(iii), (C)→(ii), (D)→(iv)
3. (A)→(iii), (B)→(ii), (C)→(i), (D)→(iv)
4. (A)→(ii), (B)→(i), (C)→(iv), (D)→(iii)
Match the following compounds with their corresponding number of moles:
| Compounds | Number of moles | ||
| A. | 88 g of CO2 | (I) | 0.25 mol |
| B. | 6.022×1023 molecules of H2O | (II) | 2.00 mol |
| C. | 5.6 L of O2 at STP | (III) | 1.00 mol |
| D. | 96 g of O2 | (IV) | 3.00 mol |
Choose the correct match:
A 4.4 g sample of an unknown gas occupies a volume of 2.24 L at NTP. Identify the gas from the following options .
1. Carbon dioxide
2. Carbon monoxide
3. Oxygen
4. Sulphur dioxide
Which of the following has the greatest number of molecules?
1. 64 g SO2
2. 44 g CO2
3. 48 g O3
4. 8 g H2
Oxygen consists of two isotopes:
\(O ^{16}\) with 90% natural abundance
\({O}^{18}\) with 10% natural abundance
Calculate the average atomic mass of oxygen based on its isotopic composition:
1. 17.4
2. 16.2
3. 16.5
4. 17
The number of atoms present in 8 g of sodium is expressed as x × 10²³. Calculate the value of x.
Given:
Nₐ = 6.02 × 10²³ mol⁻¹
Atomic mass of Na = 23 u
2. 5.03
3. 8.46
4. 3.50
| 1. | 5 : 2 | 2. | 2 : 5 |
| 3. | 1 : 2 | 4. | 5 : 4 |
What is the molecular mass of glucose (C6H12O6)?
1. 178.156 u
2. 182.162 u
3. 181.142 u
4. 180.162 u
A monoatomic gas has a vapour density of 8. If 5 grams of this gas is taken in a sample, then determine the total number of atoms present in the sample:
[Given : \(Vapour~ density = \dfrac{molar ~mass}{2}\)]
2. \(0.25 ~N_A\)
3. \(0.3125~N_A\)
4. \(N_A\)
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