Some Basic Concepts of Chemistry Test

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The strength of $$H_{2}O_{2}$$ is expressed in several ways like molarity, normality, % (w/v), volume strength etc. The strength of $$10\:V$$ means $$1$$ volume of $$H_{2}O_{2}$$ on decomposition gives $$10$$ volumes of oxygen at $$STP$$ or $$1$$ litre of $$H_{2}O_{2}$$ gives $$10$$ litre of $$O_{2}$$ at $$STP$$. The decomposition of $$H_{2}O_{2}$$ is shown as under:

$$H_{2}O_{2} (aq) \rightarrow H_{2}O(l)+\displaystyle \frac {1}{2} O_{2} (g)$$

$$H_{2}O_{2}$$ can acts as oxidising as well as reducing agent. As oxidizing agent, $$H_{2}O_{2}$$ converted into $$H_{2}O$$ and as reducing agent, $$H_{2}O_{2}$$ converted into $$O_{2}$$. In both the cases, its $$n$$-factor is $$ 2$$.

$$\therefore$$ Normality of $$H_{2}O_{2}$$ solution $$ = 2 \times $$Molarity of $$H_{2}O_{2}$$ solution.

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$$40\: g\: Ba(MnO_{4} )_{2}$$ (mol. wt. $$= 375$$ g/mol) sample containing some inert impurities in acidic medium is completely reacted with $$125$$ mL of $$33.6\: V$$ of $$H_{2}O_{2}$$. What is the percentage purity of the sample?

Some Basic Conc...

Question 1

$$10\ ml$$

$$20\ ml$$

$$30\ ml$$

$$25\ ml$$

Question 2

$$45.45\%$$

$$43.34\%$$

$$34.23\%$$

$$35.67\%$$

Question 3

30

35

40

46

Question 4

30 ml

40 ml

43 ml

49 ml

Question 5

$$28.12 \%$$

$$70.31 \%$$

$$85 \%$$

None of the above

Question 6

$$70$$ ml

$$75$$ ml

$$80$$ ml

$$82$$ ml

Question 7

$$CH_{4}= 4.5 ml, CO_{2}= 1.5 ml$$

$$CH_{4}= 3.6 ml, CO_{2}= 2.5 ml$$

$$CH_{4}= 4.8 ml, CO_{2}= 1.8 ml$$

$$CH_{4}= 5.1 ml, CO_{2}= 2.8 ml$$

Question 8

$$2:1$$

$$1:2$$

$$3:4$$

$$4:1$$

Question 9

$$\displaystyle\:C_{2}H_{2}= 16 ml, CO= 24 ml$$

$$\displaystyle\:C_{2}H_{2}= 23 ml, CO= 14 ml$$

$$\displaystyle\:C_{2}H_{2}= 30 ml, CO= 26 ml$$

$$\displaystyle\:C_{2}H_{2}= 33 ml, CO= 28 ml$$

Question 10

$$46.67\%$$

$$23.34\%$$

$$60.00\%$$

$$20.00\%$$

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