Chemical Arithmetic Test 2

Total Questions:50 Total Time: 60 Min

Remaining:

 

Questions 1 of 50

Question:Given the numbers : 161cm, 0.161cm, 0.0161 cm. The number of significant figures for the three numbers are

Answers Choices:

3, 4 and 5 respectively

3, 3 and 3 respectively

3, 3 and 4 respectively

3, 4 and 4 respectively

Questions 2 of 50

Question:Significant figures in 0.00051 are

Answers Choices:

5

3

2

4

Questions 3 of 50

Question:Which of the following halogen can be purified by sublimation

Answers Choices:

\({F_2}\)

\(C{l_2}\)

\(B{r_2}\)

\({I_2}\)

Questions 4 of 50

Question:Difference in density is the basis of

Answers Choices:

Ultrafiltration

Molecular sieving

Gravity Separation

Molecular attraction

Questions 5 of 50

Question:The prefix zepto stands for

Answers Choices:

\({10^9}\)

\({10^{ - 12}}\)

\({10^{ - 15}}\)

\({10^{ - 21}}\)

Questions 6 of 50

Question:The significant figures in 3400 are

Answers Choices:

2

5

6

4

Questions 7 of 50

Question:The number of significant figures in 6.0023 are

Answers Choices:

5

4

3

1

Questions 8 of 50

Question:Given \(P = 0.0030m\), \(Q = 2.40m\), \(R = 3000m\), Significant figures in \(P,\,Q\) and \(R\) are respectively

Answers Choices:

2, 2, 1

2, 3, 4

4, 2, 1

4, 2, 3

Questions 9 of 50

Question:A sample of calcium carbonate \((CaC{O_3})\) has the following percentage composition : Ca = 40%; C = 12%; O = 48%. If the law of constant proportions is true, then the weight of calcium in 4 g of a sample of calcium carbonate obtained from another source will be

Answers Choices:

0.016 g

0.16 g

1.6 g

16 g

Questions 10 of 50

Question:n g of substance X reacts with m g of substance Y to form p g of substance R and q g of substance S. This reaction can be represented as, \(X + Y = R + S\) . The relation which can be established in the amounts of the reactants and the products will be

Answers Choices:

\(n - m = p - q\)

\(n + m = p + q\)

\(n = m\)

\(p = q\)

Questions 11 of 50

Question:Which of the following is the best example of law of conservation of mass

Answers Choices:

12 g of carbon combines with 32 g of oxygen to form 44 g of \(C{O_2}\)

When 12 g of carbon is heated in a vacuum there is no change in mass

A sample of air increases in volume when heated at constant pressure but its mass remains unaltered

The weight of a piece of platinum is the same before and after heating in air

Questions 12 of 50

Question:The law of multiple proportions is illustrated by the two compounds

Answers Choices:

Sodium chloride and sodium bromide

Ordinary water and heavy water

Caustic soda and caustic potash

Sulphur dioxide and sulphur trioxide

Questions 13 of 50

Question:Sulphur forms the chlorides \({S_2}C{l_2}{\rm{ and }}SC{l_2}\). The equivalent mass of sulphur in \(SC{l_2}\)is

Answers Choices:

8 g/mole

16 g/mole

64.8 g/mole

32 g/mole

Questions 14 of 50

Question:The sulphate of a metal M contains 9.87% of M. This sulphate is isomorphous with \(ZnS{O_4}.7{H_2}O\). The atomic weight of M is

Answers Choices:

40.3

36.3

24.3

11.3

Questions 15 of 50

Question:When 100 ml of 1\(M\,NaOH\)solution and 10 ml of 10\(N\,{H_2}S{O_4}\)solution are mixed together, the resulting solution will be

Answers Choices:

Alkaline

Acidic

Strongly acidic

Neutral

Questions 16 of 50

Question:In chemical scale, the relative mass of the isotopic mixture of oxygen atoms \(({O^{16}},\,{O^{17}},\,{O^{18}})\) is assumed to be equal to

Answers Choices:

16

16

17

11

Questions 17 of 50

Question:Equivalent weight of crystalline oxalic acid is

Answers Choices:

30

63

53

45

Questions 18 of 50

Question:The equivalent weight of an element is 4. Its chloride has a V.D 59.25. Then the valency of the element is

Answers Choices:

4

3

2

1

Questions 19 of 50

Question:1.25 g of a solid dibasic acid is completely neutralised by 25 ml of 0.25 molar \(Ba{(OH)_2}\)solution. Molecular mass of the acid is

Answers Choices:

100

150

120

200

Questions 20 of 50

Question:The oxide of a metal has 32% oxygen. Its equivalent weight would be

Answers Choices:

34

32

17

8

Questions 21 of 50

Question:The number of molecule at NTP in 1 ml of an ideal gas will be

Answers Choices:

\(6 \times {10^{23}}\)

\(2.69 \times {10^{19}}\)

\(2.69 \times {10^{23}}\)

None of these

Questions 22 of 50

Question:The specific heat of a metal is 0.16 its approximate atomic weight would be

Answers Choices:

32

16

40

64

Questions 23 of 50

Question:The weight of a molecule of the compound \({C_{60}}{H_{122}}\)is

Answers Choices:

\(1.4 \times {10^{ - 21}}\)g

\(1.09 \times {10^{ - 21}}\)g

\(5.025 \times {10^{23}}\)g

\(16.023 \times {10^{23}}\)g

Questions 24 of 50

Question:What is the weight of oxygen required for the complete combustion of 2.8 kg of ethylene

Answers Choices:

2.8 kg

6.4 kg

9.6 kg

96 kg

Questions 25 of 50

Question:Which of the following has least mass

Answers Choices:

\(2\;g\) atom of nitrogen

\(3 \times {10^{23}}\) atoms of \(C\)

1 mole of \(S\)

\(7.0\;g\) of \(Ag\)

Questions 26 of 50

Question:How many mole of helium gas occupy \(22.4\;L\) at \({0^o}C\) at 1 atm. pressure

Answers Choices:

0.11

0.9

1

1.11

Questions 27 of 50

Question:Volume of a gas at STP is \(1.12 \times {10^{ - 7}}\)cc. Calculate the number of molecules in it

Answers Choices:

\(3.01 \times {10^{20}}\)

\(3.01 \times {10^{12}}\)

\(3.01 \times {10^{23}}\)

\(3.01 \times {10^{24}}\)

Questions 28 of 50

Question:\(4.4\;g\) of an unknown gas occupies \(2.24L\) of volume at standard temperature and pressure. The gas may be

Answers Choices:

Carbon dioxide

Carbon monoxide

Oxygen

Sulphur dioxide

Questions 29 of 50

Question:The volume occupied by 4.4 g of \(C{O_2}\)at STP is

Answers Choices:

22.4 L

2.24 L

0.224 L

0.1 L

Questions 30 of 50

Question:The number of water molecules present in a drop of water (volume 0.0018 ml) at room temperature is

Answers Choices:

\(6.023 \times {10^{19}}\)

\(1.084 \times {10^{18}}\)

\(4.84 \times {10^{17}}\)

\(6.023 \times {10^{23}}\)

Questions 31 of 50

Question:One mole of calcium phosphide on reaction with excess of water gives

Answers Choices:

One mole of phosphine

Two moles of phosphoric acid

Two moles of phosphine

One mole of phosphorus pentoxide

Questions 32 of 50

Question:19.7 kg of gold was recovered from a smuggler. How many atoms of gold were recovered (Au =197)

Answers Choices:

100

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

\(6.02 \times {10^{24}}\)

\(6.02 \times {10^{25}}\)

Questions 33 of 50

Question:\(2g\) of oxygen contains number of atoms equal to that in

Answers Choices:

\(0.5g\) of hydrogen

\(4g\) of sulphur

\(7g\) of nitrogen

\(2.3g\) of sodium

Questions 34 of 50

Question:Molarity of liquid \(HCl\) with density equal to \(1.17g/cc\) is

Answers Choices:

36.5

18.25

32.05

4.65

Questions 35 of 50

Question:How many atoms are contained in one mole of sucrose \(({C_{12}}{H_{22}}{O_{11}})\)

Answers Choices:

\(45 \times 6.02 \times {10^{23}}\) atoms/mole

\(5 \times 6.62 \times {10^{23}}\) atoms/mole

\(5 \times 6.02 \times {10^{23}}\) atoms/mole

None of these

Questions 36 of 50

Question:The number of molecules of CO2 present in 44g of CO2 is

Answers Choices:

\(6.0 \times {10^{23}}\)

\(3 \times {10^{23}}\)

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

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

Questions 37 of 50

Question:In the reaction, \(4N{H_3}(g) + 5{O_2}(g) \to 4NO(g) + 6{H_2}O(g)\), When 1 mole of ammonia and 1 mole of \({O_2}\)are made to react to completion

Answers Choices:

1.0 mole of \({H_2}O\)is produced

1.0 mole of \(NO\)will be produced

All the oxygen will be consumed

All the ammonia will be consumed

Questions 38 of 50

Question:Haemoglobin contains 0.33% of iron by weight. The molecular weight of haemoglobin is approximately 67200. The number of iron atoms (At. wt. of Fe = 56) present in one molecule of haemoglobin is

Answers Choices:

6

1

4

2

Questions 39 of 50

Question:What quantity of ammonium sulphate is necessary for the production of \(N{H_3}\)gas sufficient to neutralize a solution containing 292 g of \(HCl\)? [HCl=36.5; \({(N{H_4})_2}S{O_4}\)=132; \(N{H_3}\)=17]

Answers Choices:

272 g

403 g

528 g

1056 g

Questions 40 of 50

Question:Vapour density of a gas is 22. What is its molecular mass

Answers Choices:

33

22

44

11

Questions 41 of 50

Question:Equivalent weight of \(KMn{O_4}\) acting as an oxidant in acidic medium is

Answers Choices:

The same as its molecular weight

Half of its molecular weight

One-third of its molecular weight

One-fifth of its molecular weight

Questions 42 of 50

Question:0.16 g of dibasic acid required 25 ml of decinormal NaOH solution for complete neutralisation. The molecular weight of the acid will be

Answers Choices:

32

64

128

256

Questions 43 of 50

Question:\(KMn{O_4}\) reacts with ferrous ammonium sulphate according to the equation \(MnO_4^ - + 5F{e^{2 + }} + 8{H^ + } \to M{n^{2 + }} + 5F{e^{3 + }} + 4{H_2}O\), here 10 ml of 0.1 M \(KMn{O_4}\) is equivalent to

Answers Choices:

20 ml of 0.1 M \(FeS{O_4}\)

30 ml of 0.1 M \(FeS{O_4}\)

40 ml of 0.1 M \(FeS{O_4}\)

50 ml of 0.1 M \(FeS{O_4}\)

Questions 44 of 50

Question:\(Ca{(OH)_2} + {H_3}P{O_4} \to CaHP{O_4} + 2{H_2}O\) the equivalent weight of \({H_3}P{O_4}\) in the above reaction is

Answers Choices:

21

27

38

49

Questions 45 of 50

Question:The mass of \(BaC{O_3}\) produced when excess \(C{O_2}\) is bubbled through a solution of 0.205 mol \(Ba{(OH)_2}\) is

Answers Choices:

81 g

40.5 g

20.25 g

162 g

Questions 46 of 50

Question:The amount of water that should be added to 500 ml of 0.5 N solution of \(NaOH\)to give a concentration of 10 mg per ml is

Answers Choices:

100

200

250

500

Questions 47 of 50

Question:A compound contains atoms of three elements in A, B and C. If the oxidation number of A is +2, B is +5 and that of C is – 2, the possible formula of the compound is

Answers Choices:

\({A_3}{(B{C_4})_2}\)

\({A_3}{({B_4}C)_2}\)

\(AB{C_2}\)

\({A_2}{(B{C_3})_2}\)

Questions 48 of 50

Question:What will be the volume of \(C{O_2}\)at NTP obtained on heating 10 grams of (90% pure) limestone

Answers Choices:

22.4 litre

2.016 litre

2.24 litre

20.16 litre

Questions 49 of 50

Question:The ratio of the molar amounts of \({H_2}S\) needed to precipitate the metal ions from \(20mL\) each of \(1M\;Cd{(N{O_3})_2}\) and \(0.5M\;CuS{O_4}\) is

Answers Choices:

01:01

02:01

01:02

Indefinite

Questions 50 of 50

Question:\(12g\) of \(Mg\)(at. mass 24) will react completely with acid to give

Answers Choices:

One mole of \({H_2}\)

1/2 mole of \({H_2}\)

2/3 mole of \({O_2}\)

Both 1/2 mol of \({H_2}\) and 1/2 mol of \({O_2}\)