Past Paper 2025 12th Class Karachi Board Chemistry Objective (Science Pre-Engeneering and Pre-Medical Group)

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CHEMISTRY 2025

(Science Pre-Engineering & Pre-Medical Groups).

TIME: 3 Hours

(85 Marks)

SECTION 'A' (Multiple Choice Questions)(17)

NOTE: i) This section consists of 17 part questions and all are to be answered. Each question carries one mark.
ii) Do not copy the part questions in your answer book. Write only the answer in full against the proper number of the question and its part.
iii) The use of scientific calculator is allowed.

1. Choose the correct answer for each from the given options:

i) This give violet colour to the flame:
*Li *Na *K✓ *Be

ii) The order of reducing power of halide ion is:
* I- > Br- > Cl- > F- ✓ *F- > Cl- > Br- > I-
* I- > Cl- > F- > Br- *Br- > Cl- > I- > F-

iii) The coordination number of [Cr(en)3]+3 is:
*3 *4 *5 *6✓

iv) This fertilizer provide Nitrogen and Phosphorus in the plants:
*Urea *Potassium Nitrate
*Ammonium Nitrate *Diammonium Phosphate✓

v) This is hottest part of atmosphere .:
*Thermosphere✓ *Mesosphere
*Stratosphere *Troposphere

vi) Cathode in Castner Kellner Cell is:
*Titanium Blocks *Carbon rods
*Iron Container *Mercury ✓

vii) Diagonal relationship of lithium with:
*Be *Na *Ca *Mg✓

viii) This is low quality coal:
*Bituminous *Lignite✓ *Anthracite *Peat

ix) This is used as an Ink preservative:
*Benzene *Toluene
*Phenol *Acetophenone

x) This one is more acidic:
*Carboxylic acid *Phenol✓ *Alcohol *Water

xi) This is meta directing group:
*–OH *–NH2 *–CN ✓ *–OR

xii) Lucas reagent is a mixture of:
*Zn and Hg *Zn and HCl
*ZnCl2 and HCl✓ *NaOH and CaO

xiii) The hybridization in Carbonyl Carbon of aldehydes and ketones is:
*sp *sp2 ✓ *sp3 *dsp3

xiv) The molecule contains Ketonic group:
*Glucose *Galactose *Mannose *Fructose✓

xv) Ozone layer is present in:
*Troposphere *Stratosphere ✓
*Mesosphere *Thermosphere

xvi) Carbolic acid contains this functional group:
*–COOH *–NO2 *–OH ✓ *–SO3H

xvii) In s-block element this from super oxide:
*Mg *Li *Na✓ *Cs

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