SPSC 25 YEARS PAST PAPERS 2001 TO 2026
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
- [SbF₆]⁻ + 1H₂F⁺
- H₂SbF₆ + 2F₂
- SbF₃ + H₂ + 2F₂
- None of these
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Explanation
The reaction between HF (hydrofluoric acid) and SbF₅ (antimony pentafluoride) forms the superacid fluoroantimonic acid (HSbF₆).This reaction leads to the formation of the hexafluoroantimonate ion ([SbF₆]⁻) and the protonated hydrogen fluoride ion (H₂F⁺).
نامیاتی اضافے کا رد عمل نہیں ہے۔ ______
- Dehydration
- Hydration
- Halogenation
- None of these
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Explanation
Dehydration is an elimination reaction, not an addition reaction, as it involves the removal of a water molecule.Hydration, Halogenation, and Hydrohalogenation are all addition reactions, where atoms or groups are added to a molecule.
مندرجہ ذیل میں سے کون آپریٹنگ سسٹم کی مثال نہیں ہے؟
- MacOS
- Android
- Microsoft Office
- None of these
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Explanation
MacOS, Android, and Windows are all operating systems that manage hardware and software resources.Microsoft Office is an application suite, not an operating system.
- K1[NO2]^2
- K2[NO3][CO]
- K1[NO3][NO]
- None of these
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Explanation
The rate law depends on the slowest (rate-determining) step, which is 2NO₂ → NO₃ + NO.Since this step involves two NO₂ molecules, the rate law is Rate = K₁[NO₂]²
- 2.9
- 4.5
- 7.2
- None of these
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Explanation
Pyruvic acid (CH₃COCOOH) is a weak acid with a pKa of around 2.5, This meaning it partially ionizes in water.Using the Henderson-Hasselbalch equation, the pH of a 0.1M solution of pyruvic acid is approximately 4.5.
- Lord Byron
- Lord Tennyson
- Matthew Arnold
- None of these
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Explanation
The line "Ah, love, let us be true to one another" is from "Dover Beach", a poem by Matthew Arnold.The poem reflects on the loss of faith and the uncertain nature of the world.
- Dictionary meaning
- Associative or emotive meaning
- Referential meaning
- None of these
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Explanation
Denotation refers to the literal or dictionary meaning of a word.In contrast, connotation (associative or emotive meaning) includes the feelings and ideas a word evokes.
- Lexicon
- Syntax
- Morphology
- None of these
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Explanation
A lexicon is a person's mental dictionary containing all the words they know, including meanings and usage.It differs from a standard dictionary as it includes personal vocabulary and word associations.
- It's not important
- It can change a person's life
- It doesn't matter
- None of these
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Explanation
Pygmalion highlights how education and language can transform an individual's social status and opportunities.The play illustrates this through Eliza Doolittle, who undergoes a dramatic change in speech and manners due to Professor Higgins' training.
- Language is influenced by cognition and experience
- Language is a social institution
- Language is arbitrary
- None of these
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Explanation
Cognitive Linguistics emphasizes that language is shaped by human perception, thought processes, and real-world experiences.It rejects the idea of language as an autonomous system and instead links it to cognitive functions like categorization and metaphor.
