Some Basic Concepts of Chemistry Test

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Some Basic Concepts of Chemistry Test - 77

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Weekly Quiz Competition

Question 1
1 / -0

0.1 g of a solution containing $$Na_2CO_3$$ and $$NaHCO_3$$ requires 10 mL of 0.01 N HCl for neutralization using phenolphthalein as an indicator. Wt % of $$Na_2CO_3$$ in the mixture is

A
25

B
32

C
50

D
10.6
Question 2
1 / -0

$$12\ g$$ of impure cyanogen undergoes hydrolysis by two different pathways :
i) $$(CN)_{2}+4H_{2}O \rightarrow (NH_{4})_{2} C_{2}O_{4}$$
ii) $$(CN)_{2}+2H_{2}O \rightarrow NH_{2}CONH_{2}$$
The same amount of urea was obtained when $$11.52\ g$$ of pure ammonium carbonate was heated. If $$20\ mL$$ of $$1.6\ M$$ acidic $$KMnO_{4}$$ was required to completely oxidise $$(NH_{4})_{2}C_{2}O_{4}$$ then which of the following statement is incorrect ?

A
$$\%$$ purity of cyanogen is $$86.67\%.$$

B
$$\%$$ purity of cyanogen is $$60.67\%.$$

C
$$\%$$ progress in case $$(i)$$ is $$40\%.$$

D
$$\%$$ progress in case $$(ii)$$ is $$60\%.$$
Question 3
1 / -0

A mixture of $$S{O_2}$$ and $${O_2}$$ was made to react in such a way that every gram of mixture gives maximum amount of $$S{O_3}$$. The mass % of $$S{O_2}$$ in the mixture is

A
30 %

B
80 %

C
60 %

D
None of these

Solution
Question 4
1 / -0

$$0.4$$ gm of an organic compound was treated according to Kjeldahl`s method. The ammonia evolved was absorbed in $$50$$ ml of $$0.5$$ M $$H_3PO_3$$. The residual acid required $$30$$ ml of $$0.5$$ M $$Ca(OH)_2$$. Find the percentage of $$N_2$$ in the compound.

A
$$20\%$$

B
$$50\%$$

C
$$70\%$$

D
$$45\%$$

Solution
Question 5
1 / -0

A sample of diesel has the same knocking characteristics as a 60 ml mixture of cetane and $$a$$- methyl naphthalene mixed in 2 :1 ratio .The cetane number of the diesel sample is :

A
60

B
40

C
66.6

D
33.3

Solution
Question 6
1 / -0

According to Avogadro's law the correct statement are
a) Volume of gas is directly proportional to the no. of moles at constant T and P.
b) The pressure of gas is directly proportional to temp. of the gas under all conditions.
c) Equal volumes of different gases under similar conditions consist of equal no. of molecules.
d) Equal volumes of different gas under same conditions have equal no. of atoms.

A
b,c

B
a,c

C
d,b

D
c,d
Question 7
1 / -0

A gas mixture contains $$50\%$$ helium and $$50\%$$ methane by volume. What is the percentage by mass of methane in the mixture?

A
$$20\%$$

B
$$30\%$$

C
$$50\%$$

D
$$80\%$$

Solution
Question 8
1 / -0

A compound contains 38.8% C, 16.0% H and 45.2% N. The formula of the compound would be

A
$$\mathrm { CH } _ { 3 } \mathrm { NH } _ { 2 }$$

B
$$\mathrm { CH } _ { 3 } \mathrm { CN }$$

C
$$\mathrm { C } _ { 2 } \mathrm { H } _ { 5 } \mathrm { CN }$$

D
$$\mathrm { CH } _ { 2 } ( \mathrm { NH } ) _ { 2 }$$

Solution
Question 9
1 / -0

The percent of $$N$$ in $$33\%$$ pure $$(NH_{4})_{2}SO_{4}$$ sample is:

A
$$28$$

B
$$14$$

C
$$7$$

D
$$None\ of\ these$$

Solution
Question 10
1 / -0

In a compound A containing carbon, hydrogen and oxygen, the $$\%$$ of hydrogen is one sixth that of carbon which is 1.5 times of oxygen. What is the simplest formula for the compound:-

A
$$C_2H_4O_2$$

B
$$C_2H_4O$$

C
$$C_2H_6O$$

D
$$CH_4O$$