# 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

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

5

3

2

4

## Questions 3 of 50

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

$${F_2}$$

$$C{l_2}$$

$$B{r_2}$$

$${I_2}$$

## Questions 4 of 50

Question:Difference in density is the basis of

Ultrafiltration

Molecular sieving

Gravity Separation

Molecular attraction

## Questions 5 of 50

Question:The prefix zepto stands for

$${10^9}$$

$${10^{ - 12}}$$

$${10^{ - 15}}$$

$${10^{ - 21}}$$

## Questions 6 of 50

Question:The significant figures in 3400 are

2

5

6

4

## Questions 7 of 50

Question:The number of significant figures in 6.0023 are

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

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

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

$$n - m = p - q$$

$$n + m = p + q$$

$$n = m$$

$$p = q$$

## Questions 11 of 50

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

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

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

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

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

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

16

16

17

11

## Questions 17 of 50

Question:Equivalent weight of crystalline oxalic acid is

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

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

100

150

120

200

## Questions 20 of 50

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

34

32

17

8

## Questions 21 of 50

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

$$6 \times {10^{23}}$$

$$2.69 \times {10^{19}}$$

$$2.69 \times {10^{23}}$$

None of these

## Questions 22 of 50

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

32

16

40

64

## Questions 23 of 50

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

$$1.4 \times {10^{ - 21}}$$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

2.8 kg

6.4 kg

9.6 kg

96 kg

## Questions 25 of 50

Question:Which of the following has least mass

$$2\;g$$ 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

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

$$3.01 \times {10^{20}}$$

$$3.01 \times {10^{12}}$$

$$3.01 \times {10^{23}}$$

$$3.01 \times {10^{24}}$$

## 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

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

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

$$6.023 \times {10^{19}}$$

$$1.084 \times {10^{18}}$$

$$4.84 \times {10^{17}}$$

$$6.023 \times {10^{23}}$$

## Questions 31 of 50

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

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)

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

$$0.5g$$ 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

36.5

18.25

32.05

4.65

## Questions 35 of 50

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

$$45 \times 6.02 \times {10^{23}}$$ 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

$$6.0 \times {10^{23}}$$

$$3 \times {10^{23}}$$

$$12 \times {10^{23}}$$

$$3 \times {10^{10}}$$

## 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

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

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]

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

33

22

44

11

## Questions 41 of 50

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

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

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

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

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

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

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 â€“ 2, the possible formula of the compound is

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

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

$$AB{C_2}$$

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

## 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

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

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

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 $${O_2}$$