Some basic concepts of chemistry

The reactant which is entirely consumed when a reaction goes to completion is called

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NGSS.HS-PS1-7

How many atoms of magnesium are present in 96u of Magnesium

• 0.25

• 25

• 4

• 0.4

The volume of 1.7g of NH3 at STP (273K, 1atm) is

• 1.7L

• 2.24L

• 2.8L

• 3.4L

Number of moles present in 22.0g of carbondioxide is

• 2

• 22

• 0.5

• 0.25

The reactant which is entirely consumed when a reaction goes to completion is called

................ refers to the agreement of a particular value to the true value of the result.

What will be the molarity of a solution, which contains 5.85 g of NaCl(s) per

500 mL?

• 4

• 20

• 0.2

• 2

The number of atoms present in one mole of an element is equal to Avogadro

number. Which of the following element contains the greatest number of

atoms?

• 4g He

• 46g Na

• 0.4g Ca

• 12g He

The empirical formula and molecular mass of a compound are CH2O and

180 g respectively. What will be the molecular formula of the compound?

• C2H4O2

• HCHO

• C6H12O6

• CH3COOH

For aq sol, which is true

• 1m=1M

• 1m is less concentrated than 1M

• 1m is more concentrated than 1M

• Data insufficient