COMSATS Chemistry — Thermochemistry
Thermochemistry is part of the Chemistry section of the NTS NAT-IE test COMSATS admits on (10 of the 90 MCQs). It breaks into 1 subtopic, and we hold 21 NAT-pattern practice MCQs on it, each with a written explanation. Tap a subtopic below to practise just that.
Subtopics (1)
How Thermochemistry is tested
Across the 7 NAT-pattern papers on ParhaiKrlo, Thermochemistry accounts for 5 questions. It appears in 5 of them, about 1 questions a paper. The heaviest was COMSATS Past Paper 07, with 1 question.
| Paper | Questions |
|---|---|
| COMSATS Past Paper 07 | 1 |
| COMSATS Past Paper 06 | 1 |
| COMSATS Past Paper 05 | 1 |
| COMSATS Past Paper 04 | 1 |
| COMSATS Past Paper 02 | 1 |
Thermochemistry MCQs from the NAT-pattern papers
Try each one before opening the answer. Each comes with a short explanation.
- Q1 · COMSATS Past Paper 07 · Thermochemistry
The neutralisation of a strong acid by a strong base is:
- A.dependent only on the indicator used
- B.accompanied by no heat change
- C.exothermic
- D.endothermic
Show answer
Answer: C. exothermic — H⁺ + OH⁻ → H₂O releases heat (about −57 kJ/mol).
- Q2 · COMSATS Past Paper 06 · Thermochemistry
The standard enthalpy of formation of an element in its standard state is:
- A.zero
- B.always positive
- C.always negative
- D.1 kJ/mol
Show answer
Answer: A. zero — Forming an element from itself in its standard state involves no change, so ΔH°f = 0.
- Q3 · COMSATS Past Paper 05 · Thermochemistry
Which of the following processes is endothermic?
- A.melting of ice
- B.combustion of methane
- C.neutralisation of an acid by a base
- D.freezing of water
Show answer
Answer: A. melting of ice — Melting absorbs heat to break the forces holding the solid together.