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Chemistry MCQs

154 Questions Subject Test
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Atomic StructureChemical BondingReactionsOrganic Chemistry
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121
Medium css fpsc ppsc Uploaded: 14 Jul 2026

Which organic functional group is present in carboxylic acids?

  • A Hydroxyl group
  • B Carboxyl group COOH
  • C Carbonyl group
  • D Amino group
122
Easy fpsc Uploaded: 07 Aug 2026

What is the valency of carbon?

  • A 5
  • B 2
  • C 3
  • D 4
123
Medium fpsc ppsc nts Uploaded: 14 Jul 2026

Which gas is used in fire extinguishers to smother flames by displacing oxygen?

  • A Carbon dioxide
  • B Nitrogen
  • C Oxygen
  • D Water vapour
124
Easy fpsc Uploaded: 04 Sep 2026

Which law states that mass is neither created nor destroyed in a chemical reaction?

  • A Law of multiple proportions
  • B Law of definite proportions
  • C Law of conservation of mass
  • D Avogadro's Law
125
Medium css fpsc ppsc Uploaded: 14 Jul 2026

What is saponification in chemistry?

  • A Making soap by reacting fats with a strong alkali
  • B Conversion of oils to alcohol
  • C Adding hydrogen to unsaturated fats
  • D Making esters from acids and alcohols
126
Hard fpsc Uploaded: 04 Sep 2026

Increasing pressure on a gaseous equilibrium favors the side with:

  • A Fewer moles of gas
  • B Equal moles of gas
  • C More moles of gas
  • D No gas molecules
127
Medium fpsc ppsc nts Uploaded: 14 Jul 2026

What is the chemical name of the compound with formula Na2SO4?

  • A Sodium sulfite
  • B Sodium sulfate
  • C Sodium sulfide
  • D Sodium bisulfate
128
Medium fpsc Uploaded: 07 Aug 2026

Which type of chemical formula shows the actual number of atoms in a molecule?

  • A Molecular formula
  • B Structural formula
  • C General formula
  • D Empirical formula
129
Medium fpsc ppsc nts Uploaded: 14 Jul 2026

What is the chemical formula for ethanol the type of alcohol found in beverages?

  • A C2H5OH
  • B CH3OH
  • C C3H7OH
  • D C4H9OH
130
Medium fpsc Uploaded: 07 Aug 2026

Which of the following is the strongest acid?

  • A Acetic acid
  • B Hydrochloric acid
  • C Carbonic acid
  • D Citric acid
131
Medium css fpsc ppsc Uploaded: 05 Aug 2026

What is the chemical formula for ethanoic acid commonly found in vinegar?

  • A CH3COOH
  • B HCOOH
  • C CH3CH2COOH
  • D C3H7COOH
132
Medium fpsc ppsc nts Uploaded: 14 Jul 2026

What is the chemical formula for washing soda used in cleaning?

  • A NaHCO3
  • B NaCl
  • C Na2CO3
  • D NaOH
133
Medium fpsc Uploaded: 04 Sep 2026

Which type of isomerism involves the same molecular formula but different structural arrangements?

  • A Optical isomerism
  • B Conformational isomerism
  • C Structural isomerism
  • D Geometric isomerism
134
Medium fpsc ppsc nts Uploaded: 14 Jul 2026

What is the valency of carbon that makes it the basis of organic chemistry?

  • A 2
  • B 3
  • C 4
  • D 6
135
Medium fpsc Uploaded: 04 Sep 2026

What type of oxide typically forms when a non-metal reacts with oxygen?

  • A Acidic oxide
  • B Neutral oxide
  • C Amphoteric oxide
  • D Basic oxide
136
Medium fpsc Uploaded: 06 Aug 2026

Which type of bond involves the sharing of electron pairs?

  • A Ionic bond
  • B Covalent bond
  • C Metallic bond
  • D Hydrogen bond
137
Medium css fpsc ppsc Uploaded: 14 Jul 2026

What is the general formula of alkanes where n is the number of carbon atoms?

  • A CnH2n
  • B CnH2n+2
  • C CnHn
  • D CnH2n-2
138
Hard fpsc Uploaded: 06 Aug 2026

What is the standard unit of pressure in chemistry?

  • A Pascal
  • B Newton
  • C Joule
  • D Watt
139
Medium css fpsc ppsc Uploaded: 14 Jul 2026

Which element is liquid at room temperature and is the only non-metal element in this state?

  • A Mercury
  • B Bromine
  • C Gallium
  • D Caesium
140
Medium css fpsc ppsc Uploaded: 14 Jul 2026

What is an isotope?

  • A Atoms of different elements with the same mass
  • B Atoms of the same element with different numbers of protons
  • C Atoms of the same element with the same number of protons but different neutrons
  • D Atoms of different elements with the same electrons
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