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NEET UG Some Basic Concepts of Chemistry — practice questions — page 4

Explore 105 free Some Basic Concepts of Chemistry questions in NEET UG Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Some Basic Concepts of Chemistry questions and exercises with answers

Showing questions 91–105 of 105.

The reactant that is used up first and limits the product formed is called the:Read the answer and worked solution →For N2 + 3H2 giving 2NH3, how much ammonia forms from 2 mol of N2 and 3 mol of H2?Read the answer and worked solution →What coefficient of O2 balances the equation P4 + O2 giving P4O10?Read the answer and worked solution →In the balanced equation 2C4H10 + xO2 giving 8CO2 + 10H2O, what is x?Read the answer and worked solution →What must never be changed when balancing a chemical equation?Read the answer and worked solution →Molarity is the number of moles of solute present in one:Read the answer and worked solution →Which concentration term changes when the temperature of a solution changes?Read the answer and worked solution →2 g of NaOH (40 g/mol) is dissolved to make 500 mL of solution. What is its molarity?Read the answer and worked solution →What volume of 1 M stock solution is needed to make 500 mL of a 0.2 M solution?Read the answer and worked solution →A solution has 1 mol of ethanol and 3 mol of water. What is the mole fraction of ethanol?Read the answer and worked solution →A concentrated solution that is diluted to prepare weaker solutions is called a:Read the answer and worked solution →0.5 mol of glucose is dissolved in 250 g of water. What is the molality of the solution?Read the answer and worked solution →Which of these drugs is used in cancer therapy?Read the answer and worked solution →In 1983 the metre was redefined in terms of:Read the answer and worked solution →Pure substances are further classified into which two groups?Read the answer and worked solution →

Worked practice questions

The reactant that is used up first and limits the product formed is called the:

  1. Excess reagent
  2. Reaction catalyst
  3. Limiting reagent
  4. Stock solution
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Correct answer: C. Limiting reagent

Once this reactant runs out the reaction stops, so it decides how much product can form.

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For N2 + 3H2 giving 2NH3, how much ammonia forms from 2 mol of N2 and 3 mol of H2?

  1. 4 mol
  2. 3 mol
  3. 1 mol
  4. 2 mol
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Correct answer: D. 2 mol

3 mol of H2 reacts with only 1 mol of N2, so hydrogen is limiting and gives 2 mol of NH3.

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What coefficient of O2 balances the equation P4 + O2 giving P4O10?

  1. 5
  2. 10
  3. 4
  4. 3
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Correct answer: A. 5

P4O10 holds 10 oxygen atoms, which five O2 molecules supply.

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More Chemistry topics

Amines and BiomoleculesChemical KineticsAldehydes, Ketones and Carboxylic AcidsEquilibriumRedox ReactionsHydrocarbonsChemical Bonding and Molecular StructureSolutions