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.

(a) 45.0 g conc. HNO3

(b) 90.0 g conc. HNO3

(c) 70.0 g conc. HNO3

(d) 54.0 g conc. HNO3

Concept Questions :-

Concentration Based Problem
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

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

(a) 0.0177

(b) 0.0344

(c) 1.7700

(d) 0.1770

Concept Questions :-

Moles, Atoms & Electrons
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

6.02x1020 molecules of urea are present in 100mL of its solution. The concentration of solution is

(a) 0.02M

(b) 0.01M

(c) 0.001M

(d) 0.1M

Concept Questions :-

Moles, Atoms & Electrons
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Which has maximum number of molecules?

(a) 7g N

(b) 2g H

(c) 16g NO

(d) 16g O

Concept Questions :-

Moles, Atoms & Electrons
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The number of moles of KMnO4 reduced by one mole of KI in alkaline medium is

(a) one fifth

(b) five

(c) one

(d) two

Concept Questions :-

Equation Based Problem
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

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

(a) 0.0093 mole

(b) 2.10 moles

(c) 0.186 mole

(d) 0.21 mole

Concept Questions :-

Moles, Atoms & Electrons
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

What volume of  oxygen gas (O2) measured at $0°\mathrm{C}$ and 1 atm, is needed to burn completely 1L of  propane gas (C3H8) measured under the same conditions?

(a) 7L

(b) 6L

(c) 5L

(d) 10L

Concept Questions :-

Equation Based Problem
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

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)

(a) Mg, 0.16g

(b) O2, 0.16g

(c) Mg, 0.44g

(d) O2, 0.28g

Concept Questions :-

Equation Based Problem
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

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

(a) 1.568 x 10

(b) 15.68

(c) 2.168 x 10

(d) 1.568 x 10

Concept Questions :-

Moles, Atoms & Electrons
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Number of moles of Mn${\mathrm{O}}_{4}^{-}$ required to oxidise one mole of ferrous oxalate completely in acidic medium will be

(a) 0.6 mole

(b) 0.4 mole

(c) 7.5 moles

(d) 0.2 mole

Concept Questions :-

Equation Based Problem