Sahiwal Board Chemistry 12TH MCQs Past Paper 2021 QUIZ

Leave a Comment / Education / By Majid Ali

1 / 17

Which of the given will have the highest boiling point?

(a) Methanal

(b) Ethanal

(c) Propanal

(d) 2-Hexanone

2 / 17

Which reagent is used to reduce a carboxylic group to an alcohol?

(a) H₂ / Ni

(b) H₂ / Pd

(c) NaBH₄

(d) LiAlH₄

3 / 17

Acetic acid is manufactured by:

(a) Distillation

(b) Fermentation

(c) Ozonolysis

(d) Esterification

4 / 17

Phosphorus helps the growth of:

(a) roots

(b) leaves

(c) stem

(d) seed

5 / 17

The chemical formula of Fluorspar is:

(a) Ca₃(PO₄)₂F

(b) CaF₂

(c) Na₃AlF₆

(d) KCl·MgCl₂·6H₂O

6 / 17

The correct statement is:

(a) Na⁺ is smaller than Na atom

(b) Na⁻ is larger than Na atom

(c) Cl⁻ is smaller than Cl atom

(d) Cl⁻ (ion) and Cl (atom) are equal in size

7 / 17

Chile saltpetre has the chemical formula:

(a) NaNO₃

(b) KNO₃

(c) Na₂B₄O₇

(d) Na₂CO₃·H₂O

8 / 17

Which of the given element is not present abundantly in earth's crust?

(a) Silicon

(b) Aluminium

(c) Sodium

(d) Oxygen

9 / 17

Laughing gas is chemically:

(a) NO

(b) N₂O

(c) NO₂

(d) N₂O₄

10 / 17

Which is the strongest acid?

(a) HClO

(b) HClO₂

(c) HClO₃

(d) HClO₄

11 / 17

Which of the given compound will react with Tollen's reagent?

(a) CH₃-CHO

(b) CH₃-CH₂-OH

(c) CH₃-COOH

(d) CH₃-CO-CH₃

12 / 17

Which compound will have maximum repulsion with H₂O?

(a) CH₄

(b) C₂H₅OH

(c) CH₃Cl

(d) CH₃-O-CH₃

13 / 17

Elimination bimolecular reactions involve:

(a) first order kinetics

(b) second order kinetics

(c) third order kinetics

(d) zero order kinetics

14 / 17

Which compound is the most reactive one?

(a) Benzene

(b) Ethene

(c) Ethane

(d) Ethyne

15 / 17

The presence of a double bond in a compound is the sign of:

(a) saturation

(b) unsaturation

(c) substitution

(d) none

16 / 17

A double bond consists of:

(a) two sigma bonds

(b) one sigma and one pi-bond

(c) one sigma two pi-bonds

(d) two pi-bonds

17 / 17

The strength of binding energy of transition elements depends upon number of:

(a) electron pairs

(b) unpaired electrons

(c) neutrons

(d) protons

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