SPSC Chemistry 25 years Past Papers

Q81: ____ is an unsaturated hydrocarbon.

ایک غیر مطمئن ہائیڈرو کاربن ہے۔ ______

CH₃CHCHCH₂CH₃

Benzene

Cyclohexane

None of these

Q82: A catalyst ______?

ایک اتپریرک کیا ہے؟

Increases the average kinetic energy of the reactants

Alters the reaction mechanism

Increases the activation energy

None of these

Q83: A laboratory reported a patient's fasting glucose level as 155 mg/dL (milligrams per deciliter). What is this value equal to in SI units?

861 mmol/L

0.00861 M

8.61 M

None of these

Q84: Gases conduct electricity at _____?

گیسیں _____ پر بجلی چلاتی ہیں؟

Ordinary pressure

High pressure

Low pressure

None of these

Q85: Laboratory ammonia is 14.3 M with a density of 0.898 g/mL. What is the mole fraction of ammonia in this solution?

0.2806 moles

0.1021 moles

0.9874 moles

None of these

Q86: The presence of unsaturation can be tested with _______?

کے ساتھ عدم اطمینان کی موجودگی کا تجربہ کیا جاسکتا ہے؟ _____

Baeyer’s reagent

Schiff’s reagent

Tollen’s reagent

None of these

Q87: Formic acid and acetic acid are distinguished from each other by reaction with ______?

فارمک ایسڈ اور ایسٹک ایسڈ ______ کے ساتھ رد عمل کے ذریعہ ایک دوسرے سے ممتاز ہیں؟

FeCl3

N3OH

HgCl2

None of these

Q88: Oxygen atom contain 8 protons, 8 electrons ______ neutrons.

8

16

7

None of these

Q89: What would be the transmittance reading on a spectrophotometer at 0.25 absorbance?

0.65 T

0.75 T

0.56 T

None of these

Q90: Paramagnetic compounds are _______ by the magnetic field.

پیرا میگنیٹک مرکبات مقناطیسی فیلڈ کے ذریعہ ______ ہیں۔

Attracted

Repelled

Neither of them

None of these