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Chemistry

Chemistry
Ruby and sapphire are oxides of

Aluminium
Tin
Iron
Copper

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Chemistry
Adding Cl2 to benzene in the presence of AlCl3 is an example of :

Elimination reaction
Addition reaction
Substitution reaction
None of the options

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Chemistry
Number of6.023 × 1020 atoms present in one mole of a gas at STP is

6.023 × 1020
6.023 × 1023
'6.023 × 10–23
'6.023 × 10–20

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Chemistry
The constituents of automobile exhaust that can cause cancer is/are :

Oxides of nitrogen
Carbon monoxide
Lead
Polycyclic hydrocarbons

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Chemistry
The unit of ionic product of water (Kw) is :

Mol-1 let-2
Mol2 let-1
Mol2 let-2
Mol-1 let-1

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Chemistry
The drug ‘Marijuana’ is a

Mental stimulant
Hallucinating substance
Tranquillizer
Sedative

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