Chemical Arithmetic Test 3

Total Questions:50 Total Time: 60 Min

Remaining:

 

Questions 1 of 50

Question:Which of the following elements of matter would best convey that there is life on earth

Answers Choices:

Oxygen

Hydrogen

Carbon

Iron

Questions 2 of 50

Question:The compound which is added to table salt for maintaining proper health is

Answers Choices:

KCl

\(KBr\)

\(NaI\)

\(MgB{r_2}\)

Questions 3 of 50

Question:Which of the following contains only one element

Answers Choices:

Marble

Diamond

Glass

Sand

Questions 4 of 50

Question:In known elements, the maximum number is of

Answers Choices:

Metals

Non-metals

Metalloids

None of these

Questions 5 of 50

Question:The number of significant figures in 60.0001 is

Answers Choices:

5

6

3

2

Questions 6 of 50

Question:A sample was weighted using two different balances. The result’s were (i) 3.929 g (ii) 4.0 g. How would the weight of the sample be reported

Answers Choices:

3.929 g

3 g

3.9 g

3.93 g

Questions 7 of 50

Question:Which of the following pairs of substances illustrate the law of multiple proportions

Answers Choices:

CO and \(C{O_{\rm{2}}}\)

\({H_2}O{\rm{ and }}{D_2}O\)

\(NaCl{\rm{ and }}NaBr\)

\(MgO{\rm{ and }}Mg{(OH)_2}\)

Questions 8 of 50

Question:1.0 g of an oxide of A contained 0.5 g of A. 4.0 g of another oxide of A contained 1.6 g of A. The data indicate the law of

Answers Choices:

Reciprocal proportions

Constant proportions

Conservation of energy

Multiple proportions

Questions 9 of 50

Question:In compound A, 1.00 g nitrogen unites with 0.57 g oxygen. In compound B, 2.00 g nitrogen combines with 2.24 g oxygen. In compound C, 3.00 g nitrogen combines with 5.11 g oxygen. These results obey the following law

Answers Choices:

Law of constant proportion

Law of multiple proportion

Law of reciprocal proportion

Dalton's law of partial pressure

Questions 10 of 50

Question:Hydrogen combines with oxygen to form \({H_2}O\) in which 16 g of oxygen combine with 2 g of hydrogen. Hydrogen also combines with carbon to form \(C{H_4}\) in which 2 g of hydrogen combine with 6 g of carbon. If carbon and oxygen combine together then they will do show in the ratio of

Answers Choices:

6 : 16 or 12 : 32

06:18

01:02

12:24

Questions 11 of 50

Question:2 g of hydrogen combine with 16 g of oxygen to form water and with 6 g of carbon to form methane. In carbon dioxide 12 g of carbon are combined with 32 g of oxygen. These figures illustrate the law of

Answers Choices:

Multiple proportions

Constant proportions

Reciprocal proportions

Conservation of mass

Questions 12 of 50

Question:An element forms two oxides containing respectively 53.33 and 36.36 percent of oxygen. These figures illustrate the law of

Answers Choices:

Conservation of mass

Constant proportions

Reciprocal proportions

Multiple proportions

Questions 13 of 50

Question:For preparing 0.1 N solution of a compound from its impure sample of which the percentage purity is known, the weight of the substance required will be

Answers Choices:

More than the theoretical weight

Less than the theoretical weight

Same as the theoretical weight

None of these

Questions 14 of 50

Question:1 mol of \(C{H_4}\)contains

Answers Choices:

\(6.02 \times {10^{23}}\)atoms of H

4 g atom of Hydrogen

\(1.81 \times {10^{23}}\)molecules of \(C{H_4}\)

3.0 g of carbon

Questions 15 of 50

Question:In the reaction \(2N{a_2}{S_2}{O_3} + {I_2} \to N{a_2}{S_4}{O_6} + 2NaI\), the equivalent weight of \(N{a_2}{S_2}{O_3}\)(mol. wt. = M) is equal to

Answers Choices:

M

\(M/2\)

\(M/3\)

\(M/4\)

Questions 16 of 50

Question:When potassium permanganate is titrated against ferrous ammonium sulphate, the equivalent weight of potassium permanganate is

Answers Choices:

Molecular weight /10

Molecular weight /5

Molecular weight /2

Molecular weight

Questions 17 of 50

Question:The mass of a molecule of water is

Answers Choices:

\(3 \times {10^{ - 26}}\)kg

\(3 \times {10^{ - 25}}\)kg

\(1.5 \times {10^{ - 26}}\)kg

\(2.5 \times {10^{ - 26}}\)kg

Questions 18 of 50

Question:1.24 gm P is present in 2.2 gm

Answers Choices:

\({P_4}{S_3}\)

\({P_2}{S_2}\)

\(P{S_2}\)

\({P_2}{S_4}\)

Questions 19 of 50

Question:The atomic weights of two elements A and B are 40 and 80 respectively. If x g of A contains y atoms, how many atoms are present in 2x g of B

Answers Choices:

\(\frac{y}{2}\)

\(\frac{y}{4}\)

y

2y

Questions 20 of 50

Question:Assuming fully decomposed, the volume of \(C{O_2}\)released at STP on heating 9.85g of \(BaC{O_3}\)(Atomic mass of Ba=137) will be

Answers Choices:

0.84 L

2.24 L

4.06 L

1.12 L

Questions 21 of 50

Question:What volume of \(N{H_3}\)gas at STP would be needed to prepare 100ml of 2.5 molal (2.5m) ammonium hydroxide solution

Answers Choices:

0.056 litres

0.56 litres

5.6 litres

11.2 litres

Questions 22 of 50

Question:If the density of water is 1 g \(c{m^{ - 3}}\)then the volume occupied by one molecule of water is approximately

Answers Choices:

\(18\,\,c{m^3}\)

\(22400\,\,c{m^3}\)

\(6.02 \times {10^{ - 23}}\,\,c{m^3}\)

\(3.0 \times {10^{ - 23}}\,\,c{m^3}\)

Questions 23 of 50

Question:Caffeine has a molecular weight of 194. If it contains 28.9% by mass of nitrogen, number of atoms of nitrogen in one molecule of caffeine is

Answers Choices:

4

6

2

3

Questions 24 of 50

Question:A 400 mg iron capsule contains 100 mg of ferrous fumarate, \({(CHCOO)_2}Fe\). The percentage of iron pasent in it is approximately

Answers Choices:

33%

25%

14%

8%

Questions 25 of 50

Question:The number of moles of oxygen in \(1\;L\) of air containing 21% oxygen by volume, in standard conditions, is

Answers Choices:

0.186 mol

0.21 mol

2.10 mol

0.0093 mol

Questions 26 of 50

Question:The number of molecules in \(8.96\;L\) of a gas at \({0^o}C\) and 1 atmosphere pressure is approximately

Answers Choices:

\(6.02 \times {10^{23}}\)

\(12.04 \times {10^{23}}\)

\(18.06 \times {10^{23}}\)

\(24.08 \times {10^{22}}\)

Questions 27 of 50

Question:The equivalent weight of a metal is 9 and vapour density of its chloride is 59.25. The atomic weight of metal is

Answers Choices:

23.9

27.3

36.3

48.3

Questions 28 of 50

Question:The molecular weight of a gas is 45. Its density at STP is

Answers Choices:

22.4

11.2

5.7

2

Questions 29 of 50

Question:The total number of protons in 10 g of calcium carbonate is (\({N_0} = 6.023 \times {10^{23}}\))

Answers Choices:

\(1.5057 \times {10^{24}}\)

\(2.0478 \times {10^{24}}\)

\(3.0115 \times {10^{24}}\)

\(4.0956 \times {10^{24}}\)

Questions 30 of 50

Question:The number of molecules in 16 g of methane is

Answers Choices:

\(3.0 \times {10^{23}}\)

\(6.02 \times {10^{23}}\)

\(\frac{{16}}{{6.02}} \times {10^{23}}\)

\(\frac{{16}}{{3.0}} \times {10^{23}}\)

Questions 31 of 50

Question:Number of molecules in 100 ml of each of \({O_2},\,N{H_3}{\rm{ and}}\,C{O_2}\)at STP are

Answers Choices:

In the order \(C{O_2} < {O_2} < N{H_3}\)

In the order \(N{H_3} < {O_2} < C{O_2}\)

The same

\(N{H_3} = C{O_2} < {O_2}\)

Questions 32 of 50

Question:The molecular weight of hydrogen peroxide is 34. What is the unit of molecular weight

Answers Choices:

\(g\)

\(mol\)

\(g\,mo{l^{ - 1}}\)

\(mol\,{g^{ - 1}}\)

Questions 33 of 50

Question:A sample of phosphorus trichloride \((PC{l_3})\) contains 1.4 moles of the substance. How many atoms are there in the sample

Answers Choices:

4

5.6

\(8.431 \times {10^{23}}\)

\(3.372 \times {10^{24}}\)

\(2.409 \times {10^{24}}\)

Questions 34 of 50

Question:The number of sodium atoms in 2 moles of sodium ferrocyanide is

Answers Choices:

\(12 \times {10^{23}}\)

\(26 \times {10^{23}}\)

\(34 \times {10^{23}}\)

\(48 \times {10^{23}}\)

Questions 35 of 50

Question:The percentage of oxygen in \(NaOH\) is

Answers Choices:

40

60

8

10

Questions 36 of 50

Question:The percentage of nitrogen in urea is about

Answers Choices:

46

85

18

28

Questions 37 of 50

Question:The percentage of \({P_2}{O_5}\)in diammonium hydrogen phosphate \({(N{H_4})_2}HP{O_4}\)is

Answers Choices:

23.48

46.96

53.78

71

Questions 38 of 50

Question:If \(1\frac{1}{2}\)moles of oxygen combine with Al to form \(A{l_2}{O_3}\)the weight of Al used in the reaction is (Al=27)

Answers Choices:

27 g

54 g

49.5 g

31 g

Questions 39 of 50

Question:The percentage of Se in peroxidase anhydrous enzyme is 0.5% by weight (atomic weight=78.4). Then minimum molecular weight of peroxidase anhydrous enzyme is

Answers Choices:

\(1.568 \times {10^4}\)

\(1.568 \times {10^3}\)

\(15.68\)

\(3.136 \times {10^4}\)

Questions 40 of 50

Question:\({H_2}\) evolved at STP on complete reaction of 27 g of Aluminium with excess of aqueous \(NaOH\) would be

Answers Choices:

22.4

44.8

67.2

33.6 litres

Questions 41 of 50

Question:To neutralise 20 ml of \(M/10\) sodium hydroxide, the volume of \(M/20\) hydrochloric acid required is

Answers Choices:

10 ml

15 ml

20 ml

40 ml

Questions 42 of 50

Question:Hydrochloric acid solutions A and B have concentration of 0.5 N and 0.1 N respectively. The volume of solutions A and B required to make 2 litres of 0.2 N hydrochloric are

Answers Choices:

0.5 l of A + 1.5 l of B

1.5 l of A + 0.5 l of B

1.0 l of A + 1.0 l of B

0.75 l of A + 1.25 l of B

Questions 43 of 50

Question:5 ml of N HCl, 20 ml of \(N/2\,\,{H_2}S{O_4}\) and 30 ml of \(N/3\,\,HN{O_3}\) are mixed together and volume made to one litre. The normality of the resulting solution is

Answers Choices:

\(N/5\)

\(N/10\)

\(N/20\)

\(N/40\)

Questions 44 of 50

Question:Under similar conditions of pressure and temperature, 40 ml of slightly moist hydrogen chloride gas is mixed with 20 ml of ammonia gas, the final volume of gas at the same temperature and pressure will be

Answers Choices:

100 ml

20 ml

40 ml

60 ml

Questions 45 of 50

Question:Number of moles of \(KMn{O_4}\)required to oxidize one mole of \(Fe({C_2}{O_4})\)in acidic medium is

Answers Choices:

0.6

0.17

0.2

0.4

Questions 46 of 50

Question:A hydrocarbon contains 86% carbon, 488ml of the hydrocarbon weight 1.68 g at STP. Then the hydrocarbon is an

Answers Choices:

Alkane

Alkene

Alkyne

Arene

Questions 47 of 50

Question:The ratio of amounts of \({H_2}S\)needed to precipitate all the metal ions from 100 ml of 1 M \(AgN{O_3}\)and 100 ml of 1 M \(CuS{O_4}\)will be

Answers Choices:

01:01

01:02

02:01

None of these

Questions 48 of 50

Question:How many grams of caustic potash required to completely neutralise 12.6 gm \(HN{O_3}\)

Answers Choices:

22.4 KOH

1.01 KOH

6.02 KOH

11.2 KOH

Questions 49 of 50

Question:\(1.5\) mol of \({O_2}\) combine with \(Mg\) to form oxide \(MgO\). The mass of \(Mg\) (at. mass 24) that has combined is

Answers Choices:

\(72\;g\)

\(36\;g\)

\(48\;g\)

\(24\;g\)

Questions 50 of 50

Question:100 g \({\rm{CaC}}{{\rm{O}}_{\rm{3}}}\) reacts with 1litre 1 N HCl. On completion of reaction how much weight of \(C{O_2}\) will be obtain

Answers Choices:

\(5.5\;g\)

\(11\;g\)

\(22\;g\)

\(33\;g\)

\(44\;g\)