ECAT Chemistry — s-Block Elements
s-Block Elements is part of the Chemistry section of the UET ECAT (30 of the 100 MCQs). It breaks into 1 subtopic, and we hold 16 ECAT-pattern practice MCQs on it, each with a written explanation. Tap a subtopic below to practise just that.
Subtopics (1)
How s-Block Elements is tested
Across the 7 ECAT past papers on ParhaiKrlo, s-Block Elements accounts for 5 questions. It appears in 2 of them, about 2.5 questions a paper. The heaviest was ECAT Past Paper 05, with 3 questions.
| Paper | Questions |
|---|---|
| ECAT Past Paper 05 | 3 |
| ECAT Past Paper 01 | 2 |
s-Block Elements MCQs from the ECAT past papers
Try each one before opening the answer. Each comes with a short explanation.
- Q1 · ECAT Past Paper 05 · s-Block Elements
Which of the following hydrides is ionic in nature?
- A.NaH
- B.NH₃
- C.CH₄
- D.H₂S
Show answer
Answer: A. NaH — NaH contains Na⁺ and H⁻ ions; alkali-metal hydrides are ionic (saline) hydrides.
- Q2 · ECAT Past Paper 01 · s-Block Elements
Which of the following is NOT an alkali metal?
- A.Ra
- B.K
- C.Na
- D.All
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Answer: A. Ra — Radium is a Group 2 (alkaline earth) metal; K and Na are Group 1 alkali metals.
- Q3 · ECAT Past Paper 05 · s-Block Elements
Which equation represents the reaction when lithium nitrate is heated?
- A.2LiNO₃ → Li₂O
- B.4LiNO₃ → 4LiO₂ + 4NO₂ + O₂
- C.4LiNO₃ → 2Li₂O + 4NO₂
- D.4LiNO₃ → 2Li₂O + 4NO₂ + O₂
Show answer
Answer: D. 4LiNO₃ → 2Li₂O + 4NO₂ + O₂ — Like Group 2 nitrates, LiNO₃ decomposes to the oxide, NO₂ and O₂: 4LiNO₃ → 2Li₂O + 4NO₂ + O₂.