SPSC Chemistry 25 years Past Papers

Q51: Slight oxidation of a primary alcohol gives ______?

بنیادی الکحل کا ہلکا سا آکسیکرن ______ دیتا ہے؟

An aldehyde

A ketone

An ether

None of these

Q52: Ca(OH)₂ is commonly known as _____?

Washing soda

Quicklime

Slaked lime

None of these

Q53: Identify the false statement: Energy of IR is higher than the visible light, Energy of UV is higher than the visible light, Energy of IR is lower than the visible light, Energy of UV is higher than IR radiation

Energy of IR is higher than the visible light

Energy of UV is higher than the visible light

Energy of IR is lower than the visible light

Energy of UV is higher than IR radiation

Q54: A racemic mixture is a equimolar mixture of ______?

ایک ریسکم مرکب ______ کا ایک مساوی مرکب ہے؟

Enantiomers

Stereoisomers

Diastereomers

None of these

Q55: An equilibrium constant of 1 for a reaction means that the reaction is _______?

ایک ردعمل کے لئے 1 کا ایک مساوات کا مطلب یہ ہے کہ ردعمل _______ ہے؟

Not very favourable and will not form very much product

Very favourable and proceeds to mostly products with very little reactions left over

One that will yield 50% products and 50% reactants left over

None of these

Q56: With increase in temperature, the velocity of _____?

درجہ حرارت میں اضافے کے ساتھ ، _____ کی رفتار؟

Both gases and liquids increases

Gases increases and liquids decreases

Gases decreases and liquids increases

None of these

Q57: The color of KMnO₄ entirely disappears by the action of reducing agent is _____?

Aqueous ammonia

Basic medium

Acidic medium

None of these

Q58: The sweetest sugar is ______?

سب سے میٹھی چینی ______ ہے؟

Glucose

Sucrose

Fructose

None of these

Q59: Hydrogenation of cis-2-butane produces _______?

Butane

Trans-butane

2-butane

None of these

Q60: The formula of Chlorohydrin is ______?

کلوروہائڈرین کا فارمولا ______ ہے؟

C(OH)3 - C(OH)2Cl

CH(Cl)2 - CH(OH)(Cl)

HO-CH2-CH(OH)(Cl)

None of these