# Chemical Arithmetic Test 1

Total Questions:50 Total Time: 60 Min

Remaining:

## Questions 1 of 50

Question:A picometre is written as

$${10^{ - 9}}$$m

$${10^{ - 10}}$$m

$${10^{ - 11}}$$m

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

## Questions 2 of 50

Question:One atmosphere is equal to

101.325 K pa

1013.25 K pa

$${10^5}$$Nm

None of these

## Questions 3 of 50

Question:Dimensions of pressure are same as that of

Energy

Force

Energy per unit volume

Force per unit volume

## Questions 4 of 50

Question:The prefix $${10^{18}}$$ is

Giga

Nano

Mega

Exa

## Questions 5 of 50

Question:81.4 g sample of ethyl alcohol contains 0.002 g of water. The amount of pure ethyl alcohol to the proper number of significant figures is

81.398 g

71.40 g

91.4 g

81 g

## Questions 6 of 50

Question:The unit J $$P{a^{ - 1}}$$is equivalent to

$${m^3}$$

$$c{m^3}$$

$$d{m^3}$$

None of these

## Questions 7 of 50

Question:From the following masses, the one which is expressed nearest to the milligram is

16 g

16.4 g

16.428 g

16.4284 g

## Questions 8 of 50

Question:The number of significant figures in $$6.02 \times {10^{23}}$$is

23

3

4

26

## Questions 9 of 50

Number of atoms in one gram of element

Number of millilitres which one mole of a gaseous substances occupies at NTP

Number of molecules present in one gram molecular mass of a substance

All of these

## Questions 10 of 50

Question:Different propartions of oxygen in the various oxides of nitrogen prove the

Equivalent proportion

Multiple proportion

Constant proportion

Conservation of matter

## Questions 11 of 50

Question:Two elements X and Y have atomic weights of 14 and 16. They form a series of compounds A, B, C, D and E in which the same amount of element X, Y is present in the ratio 1 : 2 : 3 : 4 : 5. If the compound A has 28 parts by weight of X and 16 parts by weight of Y, then the compound of C will have 28 parts weight of X and

32 parts by weight of Y

48 parts by weight of Y

64 parts by weight of Y

80 parts by weight of Y

## Questions 12 of 50

Question:Carbon and oxygen combine to form two oxides, carbon monoxide and carbon dioxide in which the ratio of the weights of carbon and oxygen is respectively 12 : 16 and 12 : 32. These figures illustrate the

Law of multiple proportions

Law of reciprocal proportions

Law of conservation of mass

Law of constant proportions

## Questions 13 of 50

Question:Which property of an element is always a whole number

Atomic weight

Equivalent weight

Atomic number

Atomic volume

## Questions 14 of 50

Question:Which one of the following properties of an element is not variable

Valency

Atomic weight

Equivalent weight

All of these

## Questions 15 of 50

Question:The modern atomic weight scale is based on

$${C^{12}}$$

$${O^{16}}$$

$${H^1}$$

$${C^{13}}$$

## Questions 16 of 50

Question:1 amu is equal to

$$\frac{1}{{12}}{\rm{of }}C - 12$$

$$\frac{1}{{14}}{\rm{of O - 16}}$$

$$1g{\rm{ of }}{H_2}$$

$$1.66 \times {10^{ - 23}}$$kg

## Questions 17 of 50

Question:7.5 grams of a gas occupy 5.8 litres of volume at STP the gas is

$$NO$$

$${N_2}O$$

$$CO$$

$$C{O_2}$$

## Questions 18 of 50

Question:The number of atoms in 4.25 g of $$N{H_3}$$is approximately

$$1 \times {10^{23}}$$

$$2 \times {10^{23}}$$

$$4 \times {10^{23}}$$

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

## Questions 19 of 50

Question:One litre of a gas at STP weight 1.16 g it can possible be

$${C_2}{H_2}$$

$$CO$$

$${O_2}$$

$$C{H_4}$$

## Questions 20 of 50

Question:The vapour density of a gas is 11.2. The volume occupied by 11.2 g of the gas at ATP will be

11.2 L

22.4 L

1 L

44.8 L

## Questions 21 of 50

Question:How much coulomb charge is present on 1g ion of $${N^{3 - }}$$

$$2.894 \times {10^5}$$Couloumb

$$6.6 \times {10^6}$$Couloumb

$$8.2 \times {10^6}$$Couloumb

$$5.2 \times {10^6}$$Couloumb

## Questions 22 of 50

Question:Ratio of $${C_p}$$and $${C_v}$$of a gas X is 1.4, the number of atom of the gas â€˜Xâ€™ present in 11.2 litres of it at NTP will be

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

$$1.2 \times {10^{23}}$$

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

$$2.01 \times {10^{23}}$$

## Questions 23 of 50

Question:If we consider that 1/6, in place of 1/12, mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will

Decrease twice

Increase two fold

Remain unchanged

Be a function of the molecular

mass of the substance

## Questions 24 of 50

Question:What should be the equivalent weight of phosphorous acid, if P=31; O=16; H=1

82

41

20.5

None of these

## Questions 25 of 50

Question:One gram of hydrogen is found to combine with 80g of bromine one gram of calcium valency=2 combines with 4g of bromine the equivalent weight of calcium is

10

20

40

80

## Questions 26 of 50

Question:The equivalent weight of $$MnS{O_4}$$is half its molecular weight when it is converted to

$$M{n_2}{O_3}$$

$$Mn{O_2}$$

$$Mn{O_4}$$

$$MnO_4^{2 - }$$

## Questions 27 of 50

Question:$$100\;mL$$ of $$P{H_3}$$ on decomposition produced phosphorus and hydrogen. The change in volume is

$$50\;mL$$ increase

$$500\;mL$$ decrease

$$900\;mL$$ decrease

Nil.

## Questions 28 of 50

Question:$$12g$$of $$Mg$$ (at. mass 24) on reacting completely with acid gives hydrogen gas, the volume of which at STP would be

$$22.4\;L$$

$$11.2\;L$$

$$44.8\;L$$

$$6.1\;L$$

## Questions 29 of 50

Question:Number of gm of oxygen in 32.2 g $$N{a_2}S{O_4}.10{H_2}O$$is

20.8

22.4

2.24

2.08

## Questions 30 of 50

Question:250 ml of a sodium carbonate solution contains 2.65 grams of $$N{a_2}C{O_3}$$. If 10 ml of this solution is diluted to one litre, what is the concentration of the resultant solution (mol. wt. of $$N{a_2}C{O_3}$$=106)

0.1 M

0.001 M

0.01 M

$${10^{ - 4}}\,$$M

## Questions 31 of 50

Question:A molar solution is one that contains one mole of a solute in

1000 g of the solvent

One litre of the solvent

One litre of the solution

22.4 litres of the solution

## Questions 32 of 50

Question:The number of oxygen atoms in 4.4 g of $$C{O_2}$$is approx.

$$1.2 \times {10^{23}}$$

$$6 \times {10^{22}}$$

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

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

## Questions 33 of 50

Question:How many molecules are present in one gram of hydrogen

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

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

$$2.5 \times {10^{23}}$$

$$1.5 \times {10^{23}}$$

## Questions 34 of 50

Question:The total number of gm-molecules of $$S{O_2}C{l_2}$$ in $$13.5g$$ of sulphuryl chloride is

0.1

0.2

0.3

0.4

## Questions 35 of 50

Question:The largest number of molecules is in

$$34g$$ of water

$$28g$$ of $$C{O_2}$$

$$46g$$ of $$C{H_3}OH$$

$$54g$$ of $${N_2}{O_5}$$

## Questions 36 of 50

Question:The number of moles of sodium oxide in $$620g$$ of it is

1 mol

10 moles

18 moles

100 moles

## Questions 37 of 50

Question:In which of the following pairs of compounds the ratio of C, H and O is same

Acetic acid and methyl alcohol

Glucose and acetic acid

Fructose and sucrose

All of these

## Questions 38 of 50

Question:How much of NaOH is required to neutralise 1500 $$c{m^3}$$of 0.1 $$N\,HCl$$ (Na = 23)

40 g

4 g

6 g

60 g

## Questions 39 of 50

Question:How much water should be added to 200 c.c of semi normal solution of $$NaOH$$to make it exactly deci normal

200 cc

400 cc

800 cc

600 cc

## Questions 40 of 50

Question:2.76 g of silver carbonate on being strongly heated yield a residue weighing

2.16 g

2.48 g

2.64 g

2.32 g

## Questions 41 of 50

Question:The solution of sulphuric acid contains 80% by weight $${H_2}S{O_4}$$. Specific gravity of this solution is 1.71. Its normality is about

18

27.9

1

10

## Questions 42 of 50

Question:Mohr's salt is dissolved in dil. $${H_2}S{O_4}$$ instead of distilled water to

Enhance the rate of dissolution

Prevent cationic hydrolysis

Increase the rate of ionization

Increase its reducing strength

## Questions 43 of 50

Question:Acidified potassium permanganate solution is decolourised by

Bleaching powder

White vitriol

Mohr's salt

Microcosmic salt

## Questions 44 of 50

Question:Approximate atomic weight of an element is 26.89. If its equivalent weight is 8.9, the exact atomic weight of element would be

26.89

8.9

17.8

26.7

## Questions 45 of 50

Question:In the preceeding question, the amount of $$N{a_2}C{O_3}$$ present in the solution is

2.650 g

1.060 g

0.530 g

0.265 g

## Questions 46 of 50

Question:How many ml of 1 (M) $${H_2}S{O_4}$$ is required to neutralise 10 ml of 1 (M) NaOH solution

2.5

5

10

20

## Questions 47 of 50

Question:Which of the following cannot give iodometric titrations

$$F{e^{3 + }}$$

$$C{u^{2 + }}$$

$$P{b^{2 + }}$$

$$A{g^ + }$$

## Questions 48 of 50

Question:A solution of 10 ml $$\frac{M}{{10}}FeS{O_4}$$was titrated with $$KMn{O_4}$$solution in acidic medium. The amount of $$KMn{O_4}$$used will be

5 ml of 0.1 M

10 ml of 1.1 M

10 ml of 0.5 M

10 ml of 0.02 M

## Questions 49 of 50

Question:1.12 ml of a gas is produced at STP by the action of 4.12 mg of alcohol, with methyl magnesium iodide. The molecular mass of alcohol is

16

41.2

82.4

156

## Questions 50 of 50

Question:The simplest formula of a compound containing 50% of element X (atomic mass 10) and 50% of element Y (atomic mass 20) is

$$XY$$
$${X_2}Y$$
$$X{Y_3}$$
$${X_2}{Y_3}$$