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Quiz 1
Mdcat-past-papers - SZABMU - Chemistry Quiz
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Board: SZABMU | Subject: Chemistry |
1. Percentage composition by mass in CO2 is:
30% C & 70% O
25% C & 75% O
27.27% C & 72.72% O
40% C & 60% O
2. Al reacts with O₂ according to: 4Al + 3O₂ → 2Al₂O₃ 27g of Al will react with how much O₂?
8g
16g
24g
32g
3. One mole of a substance is the amount of that has the same number of particles as there are atoms in exactly:
1.008g of hydrogen gas (H₂)
12g of carbon-12 isotope
16g of oxygen gas (O₂)
12g of magnesium
4. Number of H₂O molecules in 10g of ice are:
3.34 × 10²³
0.331 × 10²³
33.1 × 10²³
10
5. The efficiency of a chemical reaction can be expressed as:
Theoretical yield
Actual yield
Percent yield
Maximum yield
6. 1 mol of any substance contains -------- particles:
6.02 × 10²³
6.02 × 10²⁴
6.02 × 10²²
3.01 × 10²³
7. N₂(g) + 3H₂(g) → 2NH₃(g) How many moles of N₂ are required to manufacture 8 moles of NH₃?
2.5 moles
4 moles
3.5 moles
5 moles
8. 1g of H₂ has:
1 mole
2 moles
0.5 moles
0.25 moles
9. According to Charles law volume of gas reduces to zero at:
-12°C
0°C
-273.15°C
-210°C
10. When the pressure of a gas is plotted against volume at constant temperature, the curve obtained is known as:
Isobar
Isotherm
Isochoric
Isotonic
11. Which variable mentioned in ideal gas is assumed to be a constant in other gas laws?
Volume
mmHg
Pressure
Number of moles
12. One calorie is equal to:
4.18J
4.18KJ
0.418KJmol⁻¹
0.418KJ
13. One Calorie is equivalent to:
4.184J
4.184KJ
0.4184J
0.4184KJ
14. The SI Unit of R in General Gas equation is:
8.3143 NmK⁻¹mol⁻¹
0.0821 dm³ atom mol⁻¹K⁻¹
8.3143 J mol⁻¹K⁻¹
0.0821 dm³ torr K⁻¹ mol⁻¹
15. Collision shown by gases involve the following:
No energy change
small energy change
No pressure change
large energy change
16. Equation PV = 1/3 mNc² is called:
ideal gas
Kinetic
Vander walls
Henderson
17. The real gases show deviation from ideal behaviour at:
low temperature & low pressure
Low temperature & high pressure
High temperature & low pressure
Not visible in the image.
18. When 2 ice cubes are pressed over each other they unit to form one cube due to:
Dipole dipole attraction
Covalent attraction
Van Der Waal's forces
H-bonding
19. Air is a mixture of gases. The molecules of air do not settle down due to:
Different molar mass
Presence of dust particles in air
Non polar nature of gases
Elastic collision of gas molecules
20. Intermolecular forces between molecules of ideal gas are:
Very strong
very weak
Zero
Moderately strong
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