Some Basic Concepts of Chemistry - Test 1Contact Number: 9667591930 / 8527521718

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1.

What volume of H_{2} is liberated under similar conditions which released 2.24 dm^{3} O_{2} by electrolysis of water?

(1) 2.24 dm^{3}

(2) 1.12 dm^{3}

(3) 4.48 dm^{3}

(4) 0.56 dm^{3}

2.

How many moles of sodium carbonate is formed by decomposing 0.2 mole sodium

bicarbonate completely?

1. 0.1

2. 0.2

3. 0.4

4. 0.05

3.

200 ml of 1 M HCl solution is diluted so that the final molarity is 0.5 M. The volume of water added for dilution is

(1) 100

(2) 400

(3) 200

(4) 50

4.

5 g of NaOH is added in 200 ml of water. The molarity of resultant solution will be

1. 1 M

2. 0.725 M

3. 0.825 M

4. 0.625 M

5.

Find the volume of CO required to reduce 0.25 mole ferric oxide as per the given equation

Fe_{2}O_{3}+3CO$\to $2Fe+3CO_{2}

(1) 16.8 dm^{3}

(2) 67.2 dm^{3}

(3) 22.4 dm^{3}

(4) 44.8 dm^{3}

6.

What is the mass % of a solute in the solution obtained by dissolving 8 g of solute in 60 g of water?

1. 4.57%

2. 9.1%

3. 11.76%

4. 12.78%

7.

In Haber's process N_{2}+3H_{2} $\to $ 2NH_{3}, starting with 5L of N_{2} at STP and 5L of H_{2}, the limiting reagent will be

(1) N_{2}

(2) H_{2}

(3) Both N_{2} and H_{2}

(4) Neither N_{2} nor H_{2}

8.

50 g of a sample of Ca${\left(OH\right)}_{2}$ ¡s dissolved in 50 ml of O.5N HCl solution. The excess of HCl was neutrilized by 0.3N NaOH. The volume of NaOH used was 20cc. Calculate the percentage purity of Ca${\left(OH\right)}_{2}$

(${M}_{ca}$=40, ${M}_{0}$ = 16, ${M}_{H}$ = 1)

1. 14%

2. 1.4%

3. 0.14%

4. None of these

9.

${\mathrm{H}}_{2}+{\mathrm{O}}_{2}\to {\mathrm{H}}_{2}{\mathrm{O}}_{2}$

3 mole H_{2} is treated with x mole O_{2} to form 85 gm of ${\mathrm{H}}_{2}{\mathrm{O}}_{2}$. What is the value of x?

1. 2.5

2. 3

3. 3.5

4. 4

10.

Which of the following has maximum number of moles?

1. $1\mathrm{g}{\mathrm{H}}_{2}$

2. $5.6\mathrm{lit}.{\mathrm{SO}}_{2}\mathrm{at}\mathrm{NTP}$

3. 18 g gulcose

4. $3.011\times {10}^{22}{\mathrm{N}}_{2}\mathrm{molecule}$

11.

25 ml of a solution containing HCl and ${\mathrm{H}}_{2}{\mathrm{SO}}_{4}$ required 10 ml of a 1 N NaOH solution for neutralization. 20 ml of the same acid mixture on being treated with an excess of ${\mathrm{AgNO}}_{3}$ gives 0.1435 g of AgCl. The normality of HCl and normality of the ${\mathrm{H}}_{2}{\mathrm{SO}}_{4}$ are respectively

1. 0.40 N and 0.05 N

2. 0.05 N and 0.35 N

3. 0.05 N and 0.25 N

4. 0.40 N and 0.5 N

12.

x g of NaHCO3 is treated with 600 ml of $\frac{\mathrm{N}}{2}$ HCl and the excess of HCl is further neutralized by 100 ml of $\frac{\mathrm{N}}{2}$ NaOH.

Then the value of x would be

(1) 60

(2) 40

(3) 31

(4) 21

13.

How much minimum volume of oxygen will be required for complete combustion of 60 ml of ethylene enter (CH_{2}=CH_{2})

(1) 150 ml

(2) 170 ml

(3) 190 ml

(4) 180 ml

14.

x g of ${\mathrm{CaCO}}_{3}$ is treated with 400 ml $\frac{\mathrm{N}}{10}\mathrm{HCL}$, when all the ${\mathrm{CaCO}}_{3}$ is converted into ${\mathrm{CaCl}}_{2}$. The value of x would

1. 0.2

2. 0.8

3. 1.2

4. 2

15.

$\mathrm{NaoH}+{\mathrm{H}}_{2}{\mathrm{CO}}_{3}\to {\mathrm{NaHCO}}_{3}+{\mathrm{H}}_{2}\mathrm{O}$

x g NaOH when treated with excess of ${\mathrm{H}}_{2}{\mathrm{CO}}_{3}$ forms 100 milliequivalent of ${\mathrm{NaHCO}}_{3}$. The value of x would be

1. 4

2. 8

3. 10

4. 12

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