Tag: chemistry

Quizzes (490) Questions (9892)

Questions Related to chemistry

Multiple choice aluminium patterns and properties of metals chemistry

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

  1. Copper oxide

  2. Aluminium sulphate

  3. Nickel chloride

  4. Magnesium sulphate
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Aluminium sulphate is used in producing fire proof textiles.

Multiple choice aluminium patterns and properties of metals chemistry

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

  1. $4 Al (OH) _{3}$
  2. $4 Al (OH) _{2}$
  3. $3 Al (OH) _{4}$
  4. $3 Al (OH) _{2}$
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

Multiple choice aluminium patterns and properties of metals chemistry

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

  1. $Al$
  2. $B$
  3. $Cu$
  4. $Pt$
Reveal answer Fill a bubble to check yourself
C Correct answer
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.
Multiple choice aluminium patterns and properties of metals chemistry

Bauxite, diaspore and cryolite are the ore of the:

  1. aluminium

  2. zinc

  3. copper

  4. silver
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Bauxite-$Al _2O _3$

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

Multiple choice aluminium patterns and properties of metals chemistry

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

  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
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

Multiple choice aluminium patterns and properties of metals chemistry

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

  1. Silver

  2. Sodium

  3. Aluminium

  4. Iron
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

Multiple choice aluminium patterns and properties of metals chemistry

Crystalline metal can be transformed into metallic glass by :

  1. alloying

  2. pressing into thin plates

  3. slow cooling of molten metal

  4. very rapid cooling of molten metal
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

Multiple choice aluminium patterns and properties of metals chemistry

Duralumin is a alloy. It does not contains:

  1. $Al$
  2. $Cu$
  3. $Mg$
  4. $Na$
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

Multiple choice chemistry materials liquid crystals liquid state the liquid state

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

  1. True

  2. False

  3. Either

  4. Neither
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

Multiple choice chemistry materials liquid crystals liquid state the liquid state

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?

  1. Both liquids were identical

  2. The water was greater

  3. The mercury was greater

  4. Noting can be predicted from the given data
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When gas is collected over water, it is saturated with water vapor (Dalton's Law). The total pressure is the sum of gas pressure and water vapor pressure. Over mercury, there is negligible vapor pressure. For the same volume and total pressure, the dry gas amount must be higher in the mercury case.