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Chemistry

Chemistry
Which substance is used to retard the setting action of cement?

CaSO4, 2H2O
Al2O3
Na2O + K2O
CaO

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Chemistry
How many electrons can be accommodated in d-orbital

6
8
10
3

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Chemistry
Supersonic jet causes pollution by thinning of

O3 layer
O 2 layer
CO2 layer
SO2 layer

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Chemistry
Cinnabar is an ore/mineral of

Lead
Molybdenum
Mercury
Manganese

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Chemistry
The coordination number of body centered atom in cubic structure is

6
8
10
4

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Chemistry
Natural rubber is a polymer of

Isoprene
Styrene
Vinyl acetate
Propene

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