An element in period 4 of the periodic table forms a basic oxide of formula P2O. (a) What is the valency of P ?

An element in period 4 of the periodic table forms a basic oxide of formula P2O.
a) What is the valency of P?
b) What name is given to the group of elements in which element P belongs

---

a) 1
b) Alkali metals

---

john3 answered the question on November 12, 2017 at 12:55

Exams With Marking Schemes

• Grade 1
• Grade 2
• Grade 3
• Grade 4
• Grade 5
• Grade 6
• Grade 7
• Grade 8
• Grade 9
• PP1
• PP2
• Playgroup
• Form 1
• Form 2
• Form 3
• Form 4

Related Questions

---

• An aqueous solution of hydrogen chloride gas reacts with manganese (IV) oxide to form chlorine gas while a solution of hydrogen chloride in methylbenzene does... (Solved)
  

  An aqueous solution of hydrogen chloride gas reacts with manganese (IV) oxide to form chlorine gas while a solution of hydrogen chloride in methylbenzene does not react with manganese (IV) oxide. Explain

  Date posted: November 12, 2017 .    Answers (1)

• (a)Name the type of polymerization involved in forming Dacron (b)Give one advantage of synthetic fibres over natural fibres (Solved)
  

  a) Name the type of polymerization involved in forming Dacron
  b) Give one advantage of synthetic fibres over natural fibres

  Date posted: November 12, 2017 .    Answers (1)

• List two properties of (1)a good precipitating reagent (2)a good precipitate. (Solved)
  

  List two properties of (1)a good precipitating reagent (2)a good precipitate.

  Date posted: November 10, 2017 .    Answers (1)

• Outline the steps of carrying out a Q-test. (Solved)
  

  Outline the steps of carrying out a Q-test.

  Date posted: November 10, 2017 .    Answers (1)

• Give two examples of each of the following. (a)Biological Samples (b)Agricultural samples. (Solved)
  

  Give two examples of each of the following (a)Biological Samples.(b)Agricultural samples.

  Date posted: November 10, 2017 .    Answers (1)

• Name the intermolecular forces of attraction in water. (Solved)
  

  Name the intermolecular forces of attraction in water.

  Date posted: November 9, 2017 .    Answers (1)

• Carbon (II) oxide, methane and hydrogen are major sources of energy. (i) State and explain three reasons why hydrogen is a very attractive fuel (Solved)
  

  Carbon (II) oxide, methane and hydrogen are major sources of energy.
  i) State and explain three reasons why hydrogen is a very attractive fuel.
  ii) State one disadvantage of using hydrogen fuel instead of methane.

  Date posted: November 9, 2017 .    Answers (1)

• Give one harmful effect of radioisotopes (Solved)
  

  Give one harmful effect of radioisotopes

  Date posted: November 9, 2017 .    Answers (1)

• Give two uses of hydrogen chloride (Solved)
  

  Give two uses of hydrogen chloride

  Date posted: November 9, 2017 .    Answers (1)

• (a) What is air pollution ? (b) State four gaseous substances present in unpolluted air (Solved)
  

  (a) What is air pollution?
  (b) State four gaseous substances present in unpolluted air

  Date posted: November 9, 2017 .    Answers (1)

• a) Why is air considered as a mixture rather than a compound ? (b) State one similarity between rusting and combustion of iron. (Solved)
  

  (a) Why is air considered as a mixture rather than a compound ?
  (b) State one similarity between rusting and combustion of iron.
  (c) Explain why iron nails rust faster in sodium chloride solution than in tap water.

  Date posted: November 9, 2017 .    Answers (1)

• Magnesium sulphate may be used as a laxative. What does this term laxative mean (Solved)
  

  Magnesium sulphate may be used as a laxative. What does this term laxative mean

  Date posted: November 9, 2017 .    Answers (1)

• Describe how you can differentiate between Lead (II) ions and Calcium ions using Sodium chloride (Solved)
  

  Describe how you can differentiate between Lead (II) ions and Calcium ions using Sodium chloride

  Date posted: November 9, 2017 .    Answers (1)

• Copper (II) Sulphate crystals were placed in a beaker containing water. State and explain the observations made after two days (Solved)
  

  Copper (II) Sulphate crystals were placed in a beaker containing water. State and explain the observations made after two days.

  Date posted: November 9, 2017 .    Answers (1)

• Explain why water fetched in rocky areas tend to boil at higher temperature than distilled water (Solved)
  

  Explain why water fetched in rocky areas tend to boil at higher temperature than distilled water

  Date posted: November 9, 2017 .    Answers (1)

• What type of bond is formed when Beryllium and oxygen react (Solved)
  

  What type of bond is formed when Beryllium and oxygen react

  Date posted: November 9, 2017 .    Answers (1)

• What are the optimum conditions of conversion of SO₂ to SO₃ (Solved)
  

  What are the optimum conditions of conversion of SO₂ to SO₃

  Date posted: November 9, 2017 .    Answers (1)

• (a) Noble gas are usually unreactive. Explain this phenomena. (b) Explain the meaning of the term ductility a property found in metals (Solved)
  

  (a) Noble gas are usually unreactive. Explain this phenomena.
  (b) Explain the meaning of the term ductility a property found in metals

  Date posted: November 9, 2017 .    Answers (1)

• What is a standard solution? (Solved)
  

  What is a standard solution?

  Date posted: November 9, 2017 .    Answers (1)

• Compare the reactivity of chlorine and bromine (Solved)
  

  Compare the reactivity of chlorine and bromine

  Date posted: November 9, 2017 .    Answers (1)