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7.1 Group 1

7.1 Group 1

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Question 10
H

0.39 g of potassium reacts completely with water. The solution is then made up to 250 cm3\mathrm{cm^{3}}cm3 with water.

2K+2H2O→2KOH+H2\mathrm{2K + 2H_{2}O \rightarrow 2KOH + H_{2}}2K+2H2​O→2KOH+H2​

Relative atomic masses: H = 1, O = 16, K = 39

What is the concentration of potassium hydroxide in the solution?

[1]
A

0.0200 mol dm−30.0200\,\mathrm{mol\,dm^{-3}}0.0200moldm−3

B

0.0279 mol dm−30.0279\,\mathrm{mol\,dm^{-3}}0.0279moldm−3

C

0.0400 mol dm−30.0400\,\mathrm{mol\,dm^{-3}}0.0400moldm−3

D

1.56 mol dm−31.56\,\mathrm{mol\,dm^{-3}}1.56moldm−3

Markscheme

7.1 Group 1 Questions

  1. GCSE
  2. /Chemistry
  3. /7.1 Group 1

75 exam-style questions on Edexcel GCSE Chemistry 7.1 Group 1, covering 7.1.1 Classifying elements by group in the periodic table and 7.1.2 Properties and reactions of the alkali metals. Each one has a worked solution and a mark scheme showing where the marks go.

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