PW International Board

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PW International Board

Q.Copper(II) sulfate crystals are blue. They are made by adding an excess of copper(II) oxide to sulfuric acid. The mixture is heated and stirred. It is then filtered and the filtrate is allowed to evaporate, leaving blue crystals.
Why is filtration necessary?

1 year ago | [YT] | 1

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PW International Board

Q.Which statement about ions and ionic bonding is correct?

1 year ago | [YT] | 1

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PW International Board

Q. Graphite is a form of carbon. Why can graphite be used as a lubricant?

1 year ago | [YT] | 4

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PW International Board

Q. An oxide of nitrogen has the following composition by mass: N, 30.4%; O, 69.6%. It has a relative molecular mass of 92. What is the molecular formula of the oxide of nitrogen?

1 year ago | [YT] | 1

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PW International Board

Q. During the electrolysis of concentrated hydrochloric acid, gases are produced at both electrodes. Which statement describes the test result for the gas collected at the negative electrode?

1 year ago | [YT] | 2

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PW International Board

Q. Which process is used to make an alkene from a long-chain alkane?

1 year ago | [YT] | 4

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PW International Board

Q. Which substance is not produced during the electrolysis of concentrated aqueous sodium chloride?

1 year ago | [YT] | 3

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PW International Board

Q. Which element has an oxide that is used as a food preservative?