Chemistry-SPSC-Practice-2

Prepare for SPSC Chemistry examinations with 20 carefully designed MCQs covering Organic Chemistry, Inorganic Chemistry, Physical Chemistry, chemical bonding, chemical reactions, and coordination compounds. Test your knowledge with correct answers and explanations for effective competitive exam preparation.

Practice questions

Which type of reaction occurs when an alkene reacts with hydrogen (H₂) in the presence of a palladium catalyst?
- Addition
- Substitution
- Elimination
- Oxidation
Which of the following compounds is a ketone?
- CH₃CHO
- CH₃COCH₃
- CH₃CH₂OH
- CH₃COOH
Which of the following is a secondary alcohol?
- CH₃CH₂OH
- (CH₃)₂CHOH
- CH₃OH
- (CH₃)₃COH
The characteristic colours of many transition-metal complexes are mainly associated with:
- Transitions involving partially filled d-orbitals
- Transitions involving only s-orbitals
- Nuclear transitions
- Transitions involving only p-orbitals
Which reagent is commonly used to oxidise a primary alcohol to an aldehyde without normally causing further oxidation to a carboxylic acid?
- PCC
- KMnO₄
- Concentrated HNO₃
- NaBH₄
Which molecule has a tetrahedral molecular geometry?
- CO₂
- CH₄
- BF₃
- C₂H₄
Which of the following species acts as a nucleophile?
- H⁺
- OH⁻
- Cl⁺
- Br⁺
Which acid is stronger in aqueous solution?
- HClO
- HClO₄
- Both have equal strength
- Neither ionises in water
Which ion exhibits resonance stabilisation through equivalent Lewis structures?
- CH₄
- NO₃⁻
- NH₄⁺
- OH⁻
Which type of isomerism is exhibited by but-2-ene?
- Functional isomerism
- Chain isomerism
- Geometrical isomerism
- Optical isomerism
Which of the following complexes has square planar geometry?
- [Ni(CO)₄]
- [Pt(NH₃)₄]²⁺
- [Fe(CN)₆]³⁻
- [Co(NH₃)₆]³⁺
Which compound is aromatic according to Hückel's rule?
- Cyclohexane
- Benzene
- Cyclobutane
- Cyclopentene
Which reagent converts an alkyl halide into an alcohol through nucleophilic substitution?
- Aqueous NaOH
- KOH in ethanol
- Concentrated H₂SO₄
- Br₂ in water
Which gas is released when sodium carbonate reacts with hydrochloric acid?
- Hydrogen
- Carbon dioxide
- Oxygen
- Chlorine
Which molecule has a planar arrangement around each carbon atom involved in its carbon-carbon double bond?
- CH₄
- C₂H₄
- C₂H₆
- C₂H₂
Which compound is more acidic in aqueous solution?
- Ethanol
- Phenol
- Both have equal acidity
- Neither can donate a proton
What type of bonding predominantly holds sodium chloride (NaCl) together?
- Covalent bonding
- Ionic bonding
- Metallic bonding
- Hydrogen bonding
Which compound can undergo keto-enol tautomerism?
- CH₃COCH₃
- CH₄
- CH₃CH₃
- C₂H₂
Which substances are required to prepare a Grignard reagent from an alkyl halide?
- Magnesium and dry ether
- Zinc and hydrochloric acid
- Sodium and water
- Aluminium and hydrochloric acid
Which type of reaction occurs when benzene reacts with concentrated nitric acid in the presence of concentrated sulfuric acid?
- Addition
- Electrophilic substitution
- Elimination
- Free-radical substitution