The concentration of 69% nitric acid (by mass) in a sample with a density of 1.41 g / mL will be-

1. 15.44 mol/L

2. 17.14 mol/L

3. 20.06 mol/L

4. 12.26 mol/L

The mass of ammonia produced when 2.00 × 10³ g dinitrogen reacts with 1.00 ×10³ g of dihydrogen is: 

The total number of electrons present in 1.4 g of dinitrogen gas are:

1. \(6 . 023   \times   10^{23} \text{ electrons}\)

2. \(8 . 416   \times   10^{22} \text{ electrons}\)

3. \(4 . 214   \times   10^{23}   \text{ electrons}\)

4. \(3 . 927   \times   10^{24} \text{ electrons}\)

The mass of sodium acetate (CH₃COONa) required to make 500 mL of 0.375 molar aqueous solution would be -

Molar mass(sodium acetate) = 82.0245 g/mol

1. 17.86g

2. 31.76g

3. 20.34g

4. 15.38g

An oxide of iron contains 69.9% iron and 30.1% oxygen by mass. What is its empirical formula?

1. FeO

2. Fe₂O₃

3. Fe₃O₄

4. Fe₃O₂

If ${10}^{10}$ wheat grains are distributed each second, the time taken to distribute one Avogadro number of wheat grains would be -

$1.<mspace\; width="1em"></mspace>1.91<mspace\; width="1em"></mspace>\times <mspace\; width="1em"></mspace>{10}^6<mspace\; width="1em"></mspace>\mathrm{years}$
$2.<mspace\; width="1em"></mspace>2.31<mspace\; width="1em"></mspace>\times <mspace\; width="1em"></mspace>{10}^4<mspace\; width="1em"></mspace>\mathrm{years}$
$3.<mspace\; width="1em"></mspace>3.84<mspace\; width="1em"></mspace>\times <mspace\; width="1em"></mspace>{10}^{6<mspace\; width="1em"></mspace>}\mathrm{years}$
$4.<mspace\; width="1em"></mspace>1.91<mspace\; width="1em"></mspace>\times <mspace\; width="1em"></mspace>{10}^5<mspace\; width="1em"></mspace>\mathrm{years}$

A reading on Fahrenheit scale is $200°\mathrm{F}$. The same reading on celsius scale will be :
1. 40°C
2. 94°C
3. 93°C
4. 30°C

1. 1.5 M

2. 1.66 M

3. 0.017 M

4. 1.59 M

The mass percent of carbon in carbon dioxide is: 

The incorrect statement among the following is: