COMSATS Chemistry — Solutions and Electrochemistry
Solutions and Electrochemistry is part of the Chemistry section of the NTS NAT-IE test COMSATS admits on (10 of the 90 MCQs). It breaks into 2 subtopics, and we hold 25 NAT-pattern practice MCQs on it, each with a written explanation. Tap a subtopic below to practise just that.
Subtopics (2)
How Solutions and Electrochemistry is tested
Across the 7 NAT-pattern papers on ParhaiKrlo, Solutions and Electrochemistry accounts for 4 questions. It appears in 4 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 05 | 1 |
| COMSATS Past Paper 04 | 1 |
| COMSATS Past Paper 02 | 1 |
Solutions and Electrochemistry MCQs from the NAT-pattern papers
Try each one before opening the answer. Each comes with a short explanation.
- Q1 · COMSATS Past Paper 07 · Solutions and Electrochemistry
What is the oxidation number of manganese in KMnO₄?
- A.+4
- B.+6
- C.+5
- D.+7
Show answer
Answer: D. +7 — +1 + x + 4(−2) = 0 → x = +7.
- Q2 · COMSATS Past Paper 05 · Solutions and Electrochemistry
In an electrolytic cell, oxidation takes place at the:
- A.salt bridge
- B.both electrodes equally
- C.anode
- D.cathode
Show answer
Answer: C. anode — Oxidation always occurs at the anode.
- Q3 · COMSATS Past Paper 04 · Solutions and Electrochemistry
What mass of NaOH (molar mass 40 g/mol) is needed to make 500 cm³ of a 0.2 mol/dm³ solution?
- A.8 g
- B.4 g
- C.40 g
- D.0.4 g
Show answer
Answer: B. 4 g — Moles = 0.2 × 0.5 = 0.1 mol; mass = 0.1 × 40 = 4 g.