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Chemistry MCQs

69 Questions Subject Test
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Atomic StructureChemical BondingReactionsOrganic Chemistry
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What is the concentration of a solution measured in moles per litre called?

  • A Normality
  • B Molality
  • C Formality
  • D Molarity
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Correct Answer: Option D — Molarity
Explanation: Molarity is the measure of concentration of a solution expressed as the number of moles of solute dissolved per litre of solution with units of mol/L or M.
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What is the empirical formula of benzene?

  • A C2H2
  • B C3H3
  • C C6H6
  • D CH
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Correct Answer: Option D — CH
Explanation: Benzene's molecular formula is C6H6, but its empirical formula simplifies to CH since the ratio of carbon to hydrogen atoms is 1:1. The empirical formula represents the simplest whole-number ratio of elements in a compound.
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What is the SI unit of amount of substance?

  • A Mole
  • B Litre
  • C Gram
  • D Kilogram
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Correct Answer: Option A — Mole
Explanation: The mole is the SI base unit for measuring the amount of substance, defined as containing exactly 6.02214076×10^23 elementary entities. It allows chemists to relate atomic-scale quantities to measurable macroscopic amounts.
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Which organic functional group is present in alcohols?

  • A Carbonyl group
  • B Hydroxyl group
  • C Carboxyl group
  • D Amino group
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Correct Answer: Option B — Hydroxyl group
Explanation: The hydroxyl group OH is the functional group present in all alcohols and is responsible for their characteristic properties such as being able to form hydrogen bonds with water.
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What is the term for the amount of energy required to remove an electron from an atom?

  • A Electron affinity
  • B Ionization energy
  • C Electronegativity
  • D Bond energy
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Correct Answer: Option B — Ionization energy
Explanation: Ionization energy is the minimum energy required to remove an electron from a gaseous atom or ion. It generally increases across a period and decreases down a group in the periodic table due to atomic structure.
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46
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Which process converts vegetable oils into solid fats by adding hydrogen in the presence of a nickel catalyst?

  • A Saponification
  • B Hydrogenation
  • C Esterification
  • D Fermentation
Permalink
Correct Answer: Option B — Hydrogenation
Explanation: Hydrogenation adds hydrogen gas to unsaturated vegetable oils in the presence of a nickel catalyst converting carbon to carbon double bonds to single bonds producing solid margarine.
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47
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Which indicator is colourless in acidic solution and pink in alkaline solution?

  • A Litmus
  • B Methyl orange
  • C Universal indicator
  • D Phenolphthalein
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Correct Answer: Option D — Phenolphthalein
Explanation: Phenolphthalein is colourless in acidic and neutral solutions but turns pink to magenta in alkaline solutions and is commonly used as an indicator in acid-base titrations.
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48
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Which chemical process is used to extract metals from their ores using carbon or electrolysis?

  • A Reduction
  • B Oxidation
  • C Neutralisation
  • D Chromatography
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Correct Answer: Option A — Reduction
Explanation: Reduction is used to extract metals from their ores by removing oxygen using a reducing agent like carbon or by electrolysis for more reactive metals like aluminium.
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What is the process of adding electrons in a redox reaction called?

  • A Oxidation
  • B Reduction
  • C Ionization
  • D Neutralization
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Correct Answer: Option B — Reduction
Explanation: Reduction refers to the gain of electrons by a substance during a redox reaction, resulting in a decrease of its oxidation state. It always occurs simultaneously with oxidation in a coupled electron transfer process.
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50
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What is the role of a catalyst in a chemical reaction?

  • A Increases activation energy
  • B Is consumed by the reaction
  • C Changes the products formed
  • D Increases reaction rate without being consumed
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Correct Answer: Option D — Increases reaction rate without being consumed
Explanation: A catalyst increases the rate of a chemical reaction by providing an alternative reaction pathway with lower activation energy and is not consumed or permanently changed during the process.
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What is the formula for calculating molarity?

  • A Moles/Volume in litres
  • B Mass/Volume
  • C Moles/Mass
  • D Volume/Moles
Permalink
Correct Answer: Option A — Moles/Volume in litres
Explanation: Molarity is calculated by dividing the number of moles of solute by the volume of solution in litres. It is a widely used concentration unit in chemistry expressed as mol/L or M.
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52
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What is the term for the energy required to remove one electron from a gaseous atom?

  • A Electron affinity
  • B Electronegativity
  • C Lattice energy
  • D Ionisation energy
Permalink
Correct Answer: Option D — Ionisation energy
Explanation: Ionisation energy is the minimum energy required to remove one electron from a gaseous atom in its ground state with first ionisation energy increasing across a period and decreasing down a group.
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53
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Which element has the highest electronegativity on the Pauling scale?

  • A Oxygen
  • B Chlorine
  • C Nitrogen
  • D Fluorine
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Correct Answer: Option D — Fluorine
Explanation: Fluorine has the highest electronegativity of all elements at 3.98 on the Pauling scale due to its small atomic size and high effective nuclear charge on its outer electrons.
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54
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Which of the following best describes Avogadro's number?

  • A 6.022 x 10^20
  • B 6.022 x 10^23
  • C 6.022 x 10^26
  • D 6.022 x 10^29
Permalink
Correct Answer: Option B — 6.022 x 10^23
Explanation: Avogadro's number, 6.022 x 10^23, represents the number of particles present in one mole of any substance. This fundamental constant bridges the gap between atomic-scale quantities and measurable macroscopic amounts of matter.
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55
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What is the chemical formula for potassium permanganate a strong oxidising agent?

  • A KMnO4
  • B K2MnO4
  • C K2SO4
  • D K2Cr2O7
Permalink
Correct Answer: Option A — KMnO4
Explanation: Potassium permanganate has the formula KMnO4 and is a strong oxidising agent used in water treatment as a disinfectant and in analytical chemistry as a titrating agent.
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Which type of formula shows all the bonds between atoms in a molecule?

  • A Empirical formula
  • B Structural formula
  • C Molecular formula
  • D Ionic formula
Permalink
Correct Answer: Option B — Structural formula
Explanation: A structural formula shows all the atoms in a molecule and the bonds between them either as a displayed formula showing each bond or as a condensed structural formula.
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57
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Which type of organic reaction adds atoms across a carbon to carbon double bond in alkenes?

  • A Substitution
  • B Addition
  • C Elimination
  • D Hydrolysis
Permalink
Correct Answer: Option B — Addition
Explanation: Addition reactions are characteristic of alkenes where atoms or groups add across the carbon-carbon double bond breaking it and forming two new single bonds with the carbon atoms.
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Which scientist proposed the modern periodic law?

  • A Antoine Lavoisier
  • B John Dalton
  • C Dmitri Mendeleev
  • D Henry Moseley
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Correct Answer: Option D — Henry Moseley
Explanation: Henry Moseley formulated the modern periodic law based on atomic number rather than atomic mass, which Mendeleev had originally used. Moseley's X-ray spectroscopy work corrected several anomalies in Mendeleev's original table.
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Which element has the highest melting point among all elements?

  • A Iron
  • B Tungsten
  • C Platinum
  • D Osmium
Permalink
Correct Answer: Option B — Tungsten
Explanation: Tungsten has the highest melting point of any element at approximately 3422°C, making it valuable for applications requiring extreme heat resistance such as light bulb filaments and welding electrodes.
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What does Avogadro's number represent?

  • A Number of atoms in 1 gram of hydrogen
  • B Number of particles in one mole of a substance
  • C Number of molecules in 1 litre of gas
  • D Number of protons in a nucleus
Permalink
Correct Answer: Option B — Number of particles in one mole of a substance
Explanation: Avogadro's number is approximately 6.022 x 10 to the power 23 and represents the number of atoms molecules or ions contained in one mole of any substance.
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