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Elements, Compounds and Mixtures

concept builder on metals,non metals,compound molecule

15 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

Which of the following is responsible for a chemical reaction to occur?

  1. Atom
  2. Electron
  3. Molecule
  4. Ion
  5. Compound
Question 2 Multiple Choice (Single Answer)

When two elements are chemically combined, which of the following is formed?

  1. Atom
  2. Mixture
  3. Compound
  4. Molecule
  5. Elements cannot be combined
Question 3 Multiple Choice (Single Answer)

Which of the following non-metals exists in solid state at room temperature?

  1. Germanium
  2. Bromine
  3. Chlorine
  4. Nitrogen
  5. Sulphur
Question 4 Multiple Choice (Single Answer)

Which of the following statements is false?

  1. An electron is a sub atomic particle.
  2. Molecules are formed by chemical combinations of atoms.
  3. Alloy is a compound.
  4. Different elements are composed of the same atoms.
  5. The constituents of a compound do not retain their individual properties.
Question 5 Multiple Choice (Single Answer)

Which of the following metals exists in liquid state at room temperature?

  1. Iron
  2. Mercury
  3. Sodium
  4. Calcium
  5. Bromine
Question 6 Multiple Choice (Single Answer)

Which of the following molecules contains the same kind of atoms?

  1. Hyposulphite of soda
  2. Laughing gas
  3. Quartz
  4. Washing soda
  5. Hydrargyrum
Question 7 Multiple Choice (Single Answer)

Which of the following statements is false?

  1. Phosphorous is an illuminating element.
  2. Sodium metal when added to water produces flames.
  3. Graphite is a non-conductor of electricity.
  4. An element can exist in gaseous, liquid and solid states.
  5. Metals are lustrous.
Question 8 Multiple Choice (Single Answer)

Which of the following statements is false?

  1. Metals like copper, silver, and gold are used to make coins.
  2. Iodine and ammonia are sublimating substances.
  3. Nitrogen is a diatomic molecule.
  4. A mixture is pure where as a compound is impure.
  5. The chemical formula of tin oxide is SnO.
Question 9 Multiple Choice (Single Answer)

What is the Latin name of sodium?

  1. Aurum
  2. Natrium
  3. Stannous
  4. Plumbum
  5. Kalium
Question 10 Multiple Choice (Single Answer)

Which of the following is a non metal?

  1. Boron
  2. Tin
  3. Potassium
  4. Astatine
  5. Gallium
Question 11 Multiple Choice (Single Answer)

Which of the following metals is used to make steel?

  1. Silver
  2. Magnesium
  3. Ferrum
  4. Sodium
  5. Francium
Question 12 Multiple Choice (Single Answer)

Diamond is a different physical form of which of the following chemical elements?

  1. Carbon
  2. Silicon
  3. Graphite
  4. Igneous rock
  5. Metamorphic rock
Question 13 Multiple Choice (Single Answer)

How many total atoms are present in silica?

  1. Two
  2. One
  3. Three
  4. Four
  5. No atoms in silica.
Question 14 Multiple Choice (Single Answer)

Which of the following statements is false about a compound, which is combined in the fixed proportion?

  1. 4 grams of hydrogen combine with 32 grams of oxygen to give 36 grams of water.
  2. In the molecule of carbon dioxide, carbon and oxygen are present in fixed ratio of 3 : 8 by mass.
  3. In the molecule of water, hydrogen and oxygen are present in the ratio of 1 : 8.
  4. 12 grams of carbon combine with 32 grams of oxygen to give 40 grams of carbon dioxide.
  5. In the molecule of carbon monoxide (CO), the ratio of carbon and oxygen is 3 : 8.
Question 15 Multiple Choice (Single Answer)

Which of the following statements regarding an element is false?

  1. Elements combine randomly to form a compound.
  2. Elements are represented by symbols.
  3. The atoms of an element are different from atoms of other elements.
  4. The number of atoms present in a molecule of an element is known as the atomicity of the element.
  5. A compound can be split into simpler substances or elements.
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