Tag: chemistry

Questions Related to chemistry

When a copper vessel is exposed to moist air for a longer time. It aquires a dull green coating then the correct statement is 

chemistry metals reaction of metals reactions of metals chemical properties of metals

  1. It contains copper hydroxide

  2. It contains copper carbonate

  3. It is formed when copper reacts with moist air

  4. None of these

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Correct Option: A

The amphoteric metallic oxide is:

chemistry metals reaction of metals reactions of metals chemical properties of metals

  1. calcium oxide

  2. barium oxide

  3. zinc oxide

  4. copper (II) oxide

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Correct Option: C
Explanation:

 An amphoteric oxide is an oxide that can act as either an acid or base in a reaction.
$Al _2O _3$ is an amphoteric oxide. When reacted with HCl, it acts as a base to form the salt $AlCl _3$. When reacted with NaOH, it acts as an acid to form $NaAlO _2$.
also, zinc oxide is an amphoteric oxide.

Which one of the following is basic oxide?

chemistry metals reaction of metals reactions of metals chemical properties of metals

  1. Nitrous oxide

  2. Nitric oxide

  3. Carbon monoxide

  4. Zinc oxide

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Correct Option: D
Explanation:
Metals generally form basic  oxides, some of which are also amphoteric, such as aluminium  oxide, zinc oxide, lead oxide etc.
Non-metals generally form acidic oxides. Some oxides are neutral, such as nitrous oxide, nitric oxide, carbon monoxide water etc.

Name one metal in each part fitting the given description:

A metal that burns in oxygen with a bright light

chemistry metals reaction of metals reactions of metals chemical properties of metals

  1. Magnesium

  2. Iron

  3. Aluminium

  4. None of the above

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Correct Option: A
Explanation:

Magnesium is a metal that burns in oxygen with a bright light and the reaction can be written as:
$2Mg + O _{2} \rightarrow 2MgO$

Which metal is stored in kerosene oil?

chemistry metals reaction of metals reactions of metals chemical properties of metals

  1. Sodium

  2. Calcium

  3. Iron

  4. None of the above

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Correct Option: A
Explanation:

The metal stored in kerosene oil is Sodium(Na).

Name two product of the given reaction.

$Zn   + \underset{(Steam)}{H _2O}    \rightarrow       $

chemistry metals reaction of metals reactions of metals chemical properties of metals

  1. Zinc oxide, hydrogen

  2. Zinc, water

  3. Zinc oxide, water

  4. Zinc, hydrogen

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Correct Option: A
Explanation:

$ Zn + H _{2}O \rightarrow ZnO + H _{2}$
          (steam)

Which metals react with cold water?

chemistry metals reaction of metals reactions of metals chemical properties of metals

  1. Sodium, calcium, magnesium

  2. Iron, calcium, magnesium

  3. Iron, sodium, magnesium

  4. Potassium, sodium, magnesium

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Correct Option: A
Explanation:

The metals which react with cold water are; sodium, calcium and magnesium.

Which metal does not react with water?

chemistry metals reaction of metals reactions of metals chemical properties of metals

  1. $Cu$

  2. $Au$

  3. Both A and B

  4. $Fe$

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Correct Option: C
Explanation:

Copper, silver and gold are unreactive metals and do not react with water or mild acids. 

Which of the metals will not react with oxygen when heated?

chemistry metals reaction of metals reactions of metals chemical properties of metals

  1. Gold

  2. Iron

  3. Sodium

  4. None of the above

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Correct Option: A
Explanation:

Gold is a noble metal which does not react with oxygen on heating.

A metal which reacts with cold water vigorously producing hydrogen is:

chemistry metals reaction of metals reactions of metals chemical properties of metals

  1. zinc

  2. hydrogen

  3. sodium

  4. mercury

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Correct Option: C
Explanation:

All the alkali metals react vigorously with cold water. In each reaction, hydrogen gas is given off and the metal hydroxide is produced. The speed and violence of the reaction increases as you go down the group. This shows that the reactivity of thealkali metals increases as you go down group 1. And sodium is a group 1 element.

The correct option is C.