### Chemistry - Chemical Equations and Stoichiometry

#### Question - 1

What is the equivalent weight of KMnO4 in alkaline medium?

• A 31.60
• B 71.00
• C 52.66
• D 158.00

#### Question - 2

In the following reaction,
${ N }_{ 2 }(g)+3{ H }_{ 2 }(g)\rightarrow 2{ NH }_{ 3 }(g)$
Calculate the moles of NH3 obtained when 2 moles of N2 react with 3 moles of H2 .

• A 2 mol
• B 4 mol
• C 1 mol
• D 6 mol

#### Question - 3

How many kilograms of CaCO3 will be required to produce 56 kg CaO, if the sample is 90% pure?

• A 90 kg
• B 110 kg
• C 100 kg
• D 111.11 kg

#### Question - 4

What is the mass per cent of carbon in carbon dioxide?

• A 0.034%
• B 27.27%
• C 3.4%
• D 28.7%

#### Question - 5

Calculate the mass per cent of different elements in sodium sulphate.

• A Mass % of Na = 45.0; S = 32.37; O = 22.57
• B Mass % of Na = 32.37; S = 22.57; O = 45.0
• C Mass % of Na = 22.57; S = 45.0; O = 32.37
• D Mass % of Na = 32.37; S =45.0; O = 22.57

#### Question - 6

What is the percentage of gold in 20 carat gold?

• A 80
• B 95
• C 38.56
• D 83.33

#### Question - 7

2 moles of BaCl2 react with 2 mole of Na3PO4 according to the reaction $3BaC{ l }_{ 2 }+2N{ a }_{ 3 }{ PO }_{ 4 }\rightarrow { Ba }_{ 3 }{ \left( { PO }_{ 4 } \right) }_{ 2 }+6NaCl$ Calculate the maximum amount of Ba3(PO4)2 obtained.

• A 0.13 mol
• B 0.55 mol
• C 0.24 mol
• D 0.667 mol

#### Question - 8

If 0.56 g of a gas occupies 280 cm3 at STP, then what is the molecular mass of that gas?

• A 4.8
• B 44.8
• C 2
• D 22.4

#### Question - 9

How much of oxygen (in L) is required for the complete oxidation of 1.5 moles of sulphur into sulphur dioxide at STP?

• A 11.2
• B 22.4
• C 33.6
• D 44.8

#### Question - 10

If 500 mL of a 5 M solution is diluted to 1500 mL, what will be the molarity of the solution obtained?

• A 1.5 M
• B 1.66 M
• C 0.017 M
• D 1.59 M