Chemistry Mock Test 3 Practice
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NEET Physics Chemistry Mock Test 3
This subject-wise test sits between chapter-wise questions and a full mock so students can validate retention across multiple topics before moving deeper into exam simulation.
Preview all 30 questions in NEET Physics Chemistry Mock Test 3 (no login required)
- NEET Chemistry High-Yield Mixed Drills
1. In a period, increasing effective nuclear charge usually makes atomic radius:
- A. remains constant
- B. first decreases then increases always
- C. decreases (Correct)
- D. increases
Explanation: Effective nuclear charge increases across a period, pulling electrons closer.
- NEET Chemistry High-Yield Mixed Drills
2. Hybridisation of carbon in ethyne is:
- A. dsp2
- B. sp (Correct)
- C. sp2
- D. sp3
Explanation: Each carbon in ethyne has two sigma regions and two pi bonds, so hybridisation is sp.
- NEET Chemistry High-Yield Mixed Drills
3. Combustion reactions are usually exothermic, so their enthalpy change is:
- A. negative (Correct)
- B. positive
- C. zero always
- D. equal to entropy
Explanation: Exothermic reactions release heat, so delta H is negative at constant pressure.
- NEET Chemistry High-Yield Mixed Drills
4. If products are less than equilibrium requirement, the system shifts:
- A. backward
- B. stops immediately
- C. only if catalyst is added
- D. forward (Correct)
Explanation: When reaction quotient is less than equilibrium constant, products are deficient, so reaction moves forward.
- NEET Chemistry High-Yield Mixed Drills
5. How many moles are present in 5.6 g of N2?
- A. 0.25 mol
- B. 2 mol
- C. 0.2 mol (Correct)
- D. 1 mol
Explanation: Moles = given mass / molar mass = 5.6/28 = 0.2.
- NEET Chemistry High-Yield Mixed Drills
6. The maximum number of electrons in the shell n = 2 is:
- A. 50
- B. 8 (Correct)
- C. 18
- D. 32
Explanation: Maximum electrons in a shell = 2n^2 = 2 x 2^2 = 8.
- NEET Chemistry High-Yield Mixed Drills
7. For main-group elements across a period, the trend in atomic radius is:
- A. decreases (Correct)
- B. increases
- C. remains constant
- D. first decreases then increases always
Explanation: Effective nuclear charge increases across a period, pulling electrons closer.
- NEET Chemistry High-Yield Mixed Drills
8. Hybridisation of carbon in methane is:
- A. sp
- B. sp2
- C. dsp2
- D. sp3 (Correct)
Explanation: Methane has four sigma bonds around carbon, giving tetrahedral sp3 hybridisation.
- NEET Chemistry High-Yield Mixed Drills
9. For an exothermic reaction at constant pressure, enthalpy change is:
- A. zero always
- B. equal to entropy
- C. negative (Correct)
- D. positive
Explanation: Exothermic reactions release heat, so delta H is negative at constant pressure.
- NEET Chemistry High-Yield Mixed Drills
10. If Q
- A. only if catalyst is added
- B. forward (Correct)
- C. backward
- D. stops immediately
Explanation: When reaction quotient is less than equilibrium constant, products are deficient, so reaction moves forward.
- NEET Chemistry High-Yield Mixed Drills
11. How many moles are present in 2.8 g of N2?
- A. 0.1 mol (Correct)
- B. 1 mol
- C. 0.25 mol
- D. 2 mol
Explanation: Moles = given mass / molar mass = 2.8/28 = 0.1.
- NEET Chemistry High-Yield Mixed Drills
12. The maximum number of electrons in the shell n = 3 is:
- A. 8
- B. 32
- C. 50
- D. 18 (Correct)
Explanation: Maximum electrons in a shell = 2n^2 = 2 x 3^2 = 18.
- NEET Chemistry High-Yield Mixed Drills
13. Moving left to right in period 3, the outer shell is pulled:
- A. remains constant
- B. first decreases then increases always
- C. decreases (Correct)
- D. increases
Explanation: Effective nuclear charge increases across a period, pulling electrons closer.
- NEET Chemistry High-Yield Mixed Drills
14. Hybridisation of carbon in ethene is:
- A. dsp2
- B. sp2 (Correct)
- C. sp
- D. sp3
Explanation: Each carbon in ethene has three sigma regions and one pi bond, so hybridisation is sp2.
- NEET Chemistry High-Yield Mixed Drills
15. When a reaction releases heat to surroundings at constant pressure, delta H is:
- A. negative (Correct)
- B. positive
- C. zero always
- D. equal to entropy
Explanation: Exothermic reactions release heat, so delta H is negative at constant pressure.
- NEET Chemistry High-Yield Mixed Drills
16. When reaction quotient is smaller than equilibrium constant, net reaction direction is:
- A. backward
- B. stops immediately
- C. only if catalyst is added
- D. forward (Correct)
Explanation: When reaction quotient is less than equilibrium constant, products are deficient, so reaction moves forward.
- NEET Chemistry High-Yield Mixed Drills
17. How many moles are present in 28 g of N2?
- A. 1 mol (Correct)
- B. 0.25 mol
- C. 2 mol
Explanation: Moles = given mass / molar mass = 28/28 = 1.
- NEET Chemistry High-Yield Mixed Drills
18. The maximum number of electrons in the shell n = 4 is:
- A. 50
- B. 32 (Correct)
- C. 8
- D. 18
Explanation: Maximum electrons in a shell = 2n^2 = 2 x 4^2 = 32.
- NEET Chemistry High-Yield Mixed Drills
19. Across period 2 from Li to F, atomic radius mostly:
- A. decreases (Correct)
- B. increases
- C. remains constant
- D. first decreases then increases always
Explanation: Effective nuclear charge increases across a period, pulling electrons closer.
- NEET Chemistry High-Yield Mixed Drills
20. Hybridisation of carbon in ethyne is:
- A. sp2
- B. sp3
- C. dsp2
- D. sp (Correct)
Explanation: Each carbon in ethyne has two sigma regions and two pi bonds, so hybridisation is sp.
- NEET Chemistry High-Yield Mixed Drills
21. Combustion reactions are usually exothermic, so their enthalpy change is:
- A. zero always
- B. equal to entropy
- C. negative (Correct)
- D. positive
Explanation: Exothermic reactions release heat, so delta H is negative at constant pressure.
- NEET Chemistry High-Yield Mixed Drills
22. If products are less than equilibrium requirement, the system shifts:
- A. only if catalyst is added
- B. forward (Correct)
- C. backward
- D. stops immediately
Explanation: When reaction quotient is less than equilibrium constant, products are deficient, so reaction moves forward.
- NEET Chemistry High-Yield Mixed Drills
23. How many moles are present in 11 g of CO2?
- A. 0.25 mol (Correct)
- B. 1 mol
- C. 2 mol
Explanation: Moles = given mass / molar mass = 11/44 = 0.25.
- NEET Chemistry High-Yield Mixed Drills
24. The maximum number of electrons in the shell n = 2 is:
- A. 18
- B. 32
- C. 50
- D. 8 (Correct)
Explanation: Maximum electrons in a shell = 2n^2 = 2 x 2^2 = 8.
- NEET Chemistry High-Yield Mixed Drills
25. Across a period from left to right, atomic radius generally:
- A. remains constant
- B. first decreases then increases always
- C. decreases (Correct)
- D. increases
Explanation: Effective nuclear charge increases across a period, pulling electrons closer.
- NEET Chemistry High-Yield Mixed Drills
26. Hybridisation of carbon in methane is:
- A. dsp2
- B. sp3 (Correct)
- C. sp
- D. sp2
Explanation: Methane has four sigma bonds around carbon, giving tetrahedral sp3 hybridisation.
- NEET Chemistry High-Yield Mixed Drills
27. For an exothermic reaction at constant pressure, enthalpy change is:
- A. negative (Correct)
- B. positive
- C. zero always
- D. equal to entropy
Explanation: Exothermic reactions release heat, so delta H is negative at constant pressure.
- NEET Chemistry High-Yield Mixed Drills
28. If Q
- A. backward
- B. stops immediately
- C. only if catalyst is added
- D. forward (Correct)
Explanation: When reaction quotient is less than equilibrium constant, products are deficient, so reaction moves forward.
- NEET Chemistry High-Yield Mixed Drills
29. How many moles are present in 22 g of CO2?
- A. 0.25 mol
- B. 2 mol
- C. 0.5 mol (Correct)
- D. 1 mol
Explanation: Moles = given mass / molar mass = 22/44 = 0.5.
- NEET Chemistry High-Yield Mixed Drills
30. The maximum number of electrons in the shell n = 3 is:
- A. 50
- B. 18 (Correct)
- C. 8
- D. 32
Explanation: Maximum electrons in a shell = 2n^2 = 2 x 3^2 = 18.
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