How many grams of concentrated nitric acid solution should be used to prepare 250 mL of 2.0 M HNO3? The concentrated acid is 70% HNO3.

(1) 45.0 g conc. HNO3

(2) 90.0 g conc. HNO3

(3) 70.0 g conc. HNO3

(4) 54.0 g conc. HNO3

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Concentration Based Problem
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Mole fraction of the solute in a 1.00 molal aqueous solution is 

(1) 0.0177

(2) 0.0344

(3) 1.7700

(4) 0.1770

Concept Questions :-

Moles, Atoms & Electrons
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6.02x1020 molecules of urea are present in 100mL of its solution. The concentration of solution is 

(1) 0.02M

(2) 0.01M

(3) 0.001M

(4) 0.1M

Concept Questions :-

Moles, Atoms & Electrons
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Which has the maximum number of molecules?

(1) 7g N

(2) 2g H

(3) 16g NO

(4) 16g O

Concept Questions :-

Moles, Atoms & Electrons
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The number of moles of KMnO4 reduced by one mole of KI in an alkaline medium is 

(1) one fifth 

(2) five

(3) one

(4) two

Concept Questions :-

Equation Based Problem
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The number of moles of oxygen in 1L of air containing 21% oxygen by volume, under standard conditions, is 

(1) 0.0093 mole

(2) 2.10 moles

(3) 0.186 mole

(4) 0.21 mole

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Moles, Atoms & Electrons
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What volume of  oxygen gas (O2) measured at 0°C and 1 atm, is needed to burn completely 1L of  propane gas (C3H8) measured under the same conditions?

(1) 7L 

(2) 6L

(3) 5L

(4) 10L

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Equation Based Problem
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1 g of magnesium is burnt with 0.56g of oxygen in a closed vessel. Which reactant is left in excess and how much?

(At. weight of Mg = 24, O=16)

(1) Mg, 0.16g

(2) O2, 0.16g

(3) Mg, 0.44g

(4) O2, 0.28g

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Equation Based Problem
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Percentage of Se in peroxidase anhydrase enzyme is 0.5% by weight (at. weight = 78.4), then minimum molecular weight of peroxidase anhydrase enzyme is

(1) 1.568 x 10

(2) 15.68

(3) 2.168 x 10

(4) 1.568 x 10

Concept Questions :-

Moles, Atoms & Electrons
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Number of moles of MnO4- required to oxidise one mole of ferrous oxalate completely in acidic medium will be 

(1) 0.6 mole

(2) 0.4 mole

(3) 7.5 moles

(4) 0.2 mole

Concept Questions :-

Equation Based Problem
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