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Chemistry

Chemistry
What are the number of moles of CO2 which contains 16 g of oxygen?

0.4 mole
0.2 mole
0.25 mole
0.5 mole

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Chemistry
The most electropositive elements among the following is

Cs
Ca
K
Na

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Chemistry
Match the sourc in Column B with the product of Column A. (Product) Column B (Source)A. Formic acid1. LemonB. Citric acid 2. TamarindC. Tartaric acid3. Ants

A B C 2 3 1
A B C3 2 1
A B C 3 1 2
A B C 2 1 3

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Chemistry
In deep-sea diving, divers use a mixture of gases consisting of oxygen and

Helium
Argon
Hydrogen
Nitrogen

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Chemistry
The residue left after extracting juice from sugarbeet and sugarcane is called

Molasses
Bagasse
Biomass
Whey

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Chemistry
The following are the half lives of four active isotopes. Which one of the following is the most dangerous to handle?

3 billion years
0.01 minute
13 days
100 years

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