Some Basic Concepts of Chemistry - 9th Oct Contact Number: 9667591930 / 8527521718

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A mixture of NH_{4}NO_{3} and (NH_{4})_{2}HPO_{4} contain 30.40% mass per cent of nitrogen. What is the mass ratio of the two components in the mixture?

(1) 2:1

(2) 1:2

(3) 3:4

(4) 4:1

A metal M forms the sulphate M_{2}(SO_{4})_{3} _{.} A 0.596 gram sample of the sulphate reacts with excess ${\mathrm{BaCl}}_{2}$ to give 1.220 g ${\mathrm{BaSO}}_{4}$. What is the atomic weight of M? (Atomic weights: S=32, Ba=137.3)

(1) 26.9

(2) 69.7

(3)55.8

(4) 23

SO_{2}Cl_{2} (sulphuryl chloride) reacts with water to given a mixture of H_{2}SO_{4} and HCl. What volume of 0.2 M Ba(OH)_{2} is needed to completely neutralize 25 mL of 0.2 M SO_{2}Cl_{2} solution:

(1) 25 mL

(2) 50 mL

(3) 100 mL

(4) 200 mL

100 ${\mathrm{cm}}^{3}$ of a solution of an acid (Molar mass=98) containing 29.4 g of the acid per litre were completely neutralized by 90.0 cm^{3} of aq. NaOH containing 20 g of NaOH per 500 cm^{3}. The basicity of the acid is:

(1) 3

(2) 2

(3) 1

(4) data insufficient

A gaseous compound is composed of 85.7% by mass carbon and 14.3% by mass hydrogen. It's density is 2.28% g/litre at 300 K and 1.0 atm pressure. Determine the molecular formula of the compound:

(1) ${\mathrm{C}}_{2}{\mathrm{H}}_{2}$

(2) ${\mathrm{C}}_{2}{\mathrm{H}}_{4}$

(3) ${\mathrm{C}}_{4}{\mathrm{H}}_{8}$

(4) ${\mathrm{C}}_{4}{\mathrm{H}}_{10}$

When 22.4L of H_{2}(g) is mixed with 11.2L of Cl_{2}(g) each at STP, the moles of HCl(g) formed is equal to

1. 1 mole of HCl(g)

2. 2 moles of HCl(g)

3. 0.5 mole of HCl(g)

4. 1.5 moles of HCl(g)

1 c.c of N_{2}O at NTP contains :

(1) $\frac{1.8}{224}\times {10}^{22}$ atoms

(2) $\frac{6.02}{22400}\times {10}^{23}$ molecules

(3) $\frac{1.32}{224}\times {10}^{23}$ electrons

(4) All the above

What is the number of moles of O-atom in 126 amu of ${\mathrm{HNO}}_{3}$?

1. 2

2. $\frac{2}{{\mathrm{N}}_{\mathrm{A}}}$

3. 6

4. $\frac{6}{{\mathrm{N}}_{\mathrm{A}}}$

The number of gram molecules of oxygen in 6.02 × 10^{24} CO molecules are

1. 10 *g* molecules

2. 5 *g* molecules

3. 1 *g* molecules

4. 0.5 *g* molecules

The haemoglobin from the red blood corpuscles contains approximately 0.33% iron by mass. The molar mass of haemoglobin is 67,200. The number of iron atoms in each molecule of haemoglobin is -

(atomic mass of iron=56):

1. 2

2. 3

3. 4

4. 5

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