Tag: chemistry

Questions Related to chemistry

Which of the following materials can make cloth fire-proof?

aluminium patterns and properties of metals chemistry

  1. Copper oxide

  2. Aluminium sulphate

  3. Nickel chloride

  4. Magnesium sulphate

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Correct Option: B
Explanation:

Aluminium sulphate is used in producing fire proof textiles.

$Al {4}C _{3} + 12H _{2}O \rightarrow 3CH _{4} + $______

aluminium patterns and properties of metals chemistry

  1. $4 Al (OH) _{3}$

  2. $4 Al (OH) _{2}$

  3. $3 Al (OH) _{4}$

  4. $3 Al (OH) _{2}$

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Correct Option: A
Explanation:

$ Al _4C _3 + 12H _2O \rightarrow 3CH _4 + 4Al(OH) _3$

When Aluminium carbide $Al _4C _3$ undergoes hydrolysis forms a methane along with a aluminium hydroxide as a product.

$Re{O} {3}$ possess conductance and appearance like that of ____

aluminium patterns and properties of metals chemistry

  1. $Al$

  2. $B$

  3. $Cu$

  4. $Pt$

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Correct Option: C
Explanation:
Rhenium trioxide is an inorganic compound with the formula ReO3.
It is a red solid with a metallic lustre, which resembles Cu (copper) in appearance and conductance.

Bauxite, diaspore and cryolite are the ore of the:

aluminium patterns and properties of metals chemistry

  1. aluminium

  2. zinc

  3. copper

  4. silver

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Correct Option: A
Explanation:

Bauxite-$Al _2O _3$

Dispore- repeating units $AlO(OH)$
Cryolite- $Na _3AlF _6$
These are ores of aluminiunm.

Aluminium, deposited as vapour on a glass, forms good mirrors, essentially because:

aluminium patterns and properties of metals chemistry

  1. the coating is much smoother

  2. it does not scratch

  3. it has better shine than silver

  4. it does not tarnish in air

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Correct Option: D
Explanation:

Aluminium, deposited as vapour on a glass, forms good mirrors because it does not tarnish in air. If it tarnishes then the mirror would not be that good. Hence due to the property of it not tarnishing in air the mirror formed are good mirrors.

Which of the following metal is protected by a layer of its own oxide?

aluminium patterns and properties of metals chemistry

  1. Silver

  2. Sodium

  3. Aluminium

  4. Iron

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Correct Option: C
Explanation:

Aluminium is reactive and reacts spontaneously with water or air to form aluminium oxide $(Al _2O _3)$, forms a stable passive layer which protects aluminium from corrosion or further oxidation.

Crystalline metal can be transformed into metallic glass by :

aluminium patterns and properties of metals chemistry

  1. alloying

  2. pressing into thin plates

  3. slow cooling of molten metal

  4. very rapid cooling of molten metal

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Correct Option: D
Explanation:

Crystalline metal can be transformed into a metallic glass by very rapid colling of molten metal. On rapid cooling of molten metal gives amorphous solid which is nothing but metallic glass.
Hence option $D$ is correct.

Duralumin is a alloy. It does not contains:

aluminium patterns and properties of metals chemistry

  1. $Al$

  2. $Cu$

  3. $Mg$

  4. $Na$

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Correct Option: D
Explanation:

Duralumin is an alloy of aluminium that has copper and contains small amounts of magnesium, manganese, iron, and silicon: its applications requiring lightness and strength, as in aeroplane construction.So sodium is not present in Duralumin.

Hence option $D$ is correct.

A liquid cannot be compressed because it has a fixed volume.

chemistry materials liquid crystals liquid state the liquid state

  1. True

  2. False

  3. Either

  4. Neither

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Correct Option: A
Explanation:

1) A liquid is a nearly incompressible fluid that conforms to the shape of its container but retains a (nearly) constant volume independent of pressure.

2) When you compress liquid together, the molecular forces  become very strong stopping it from being compressed very much.

Hydrogen was collected in one case over water, and in another over mercury in the same conditions. In both cases, the volume of the gas was the same.
Amounts of hydrogen collected over?

chemistry materials liquid crystals liquid state the liquid state

  1. Both liquids were identical

  2. The water was greater

  3. The mercury was greater

  4. Noting can be predicted from the given data

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Correct Option: C