Portland cement consists essentially of compounds of:

lime (calcium oxide,

C a O

)

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silica (silicon dioxide,

S i O_{2}

)

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alumina (aluminum oxide,

A l_{2} O_{3}

)

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all of them

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Solution

The correct option is A all of them
Limestone, sand, gypsum and coal dust are the materials required for the manufacture of cement. Lime, silica and alumina are contained in the above materials. Hence, the right answer is all of them.

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Similar questions

Q. Portland cement is made from lime, silica, alumina, iron oxide and gypsum.

Q. Four main oxides present in ordinary portland cement are : CaO,

A l_{2} O_{3}

S i O_{2}

and

F e_{2} O_{3}

. Identify the correct ascending order of their proportions in a typical composition of OPC.

The constituents used in the manufacturing of different types of glasses are given below.

Silica( ${SiO}_{2}$ ), Sodium Carbonate ( ${Na}_{2} {CO}_{3}$ ), Calcium Carbonate ( ${CaCO}_{3}$ ), Potassium Carbonate( $K_{2} {CO}_{3}$ ), Boron Oxide ( $B_{2} O_{3}$ ), Alumina ( ${Al}_{2} O_{3}$ ) and Lead Oxide ( $PbO$ )

Choose the option/s that correctly matches the constituents and its use.

Q. Important constituent of Portland and high alumina cements is?

Q. What kind of compound is

C a O

or Calcium Oxide.

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Portland cement consists essentially of compounds of:

The correct option is A all of themLimestone, sand, gypsum and coal dust are the materials required for the manufacture of cement. Lime, silica and alumina are contained in the above materials. Hence, the right answer is all of them.

The correct option is A all of them
Limestone, sand, gypsum and coal dust are the materials required for the manufacture of cement. Lime, silica and alumina are contained in the above materials. Hence, the right answer is all of them.