1. Foundation and Fundamentals of chemistry quiz I

What is the correct match of elements and atomic weights?

A-i, B-ii, C-iv, D-iii

A-i, B-ii, C-iii, D-iv

D-i, C-iii, B-ii, A-iv

A-iv, B-iii, C-ii, D-i

The molecular formula of silver chromate is

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AgCrO4

Ag2CrO4

Ag2CrO6

Ag2CrO7

The molecular formula of calcium nitrite is

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Ca3NO2

Ca(NO2)2

Ca(NO3)2

Ca3N2

The relative atomic mass of C in Na2CO3 is

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6

12

24

16

The formulas of sodium hypochlorite; potassium thiosulfate; and sodium dichromate are respectively

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NaClO, K2S2O3, Na2Cr2O7

NaClO, K2S2O3, NaCr2O7

NaClO3, KS2O3, Na2Cr2O7

NaClO3, K2S2O32-, Na2Cr2O7

The relative atomic mass of sodium is

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23 g

23

22 amu

23/12 g

The number of electrons in an atom of an element is equal to its

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Atomic weight

Atomic number

Mass number

Electron affinity

The relative atomic mass of chlorine is

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35

36

37

35.5

What is the correct match of elements and atomic weights? (S=32, Cl=35.5, Zn=65.5, P=31)

Choose the correct matching.

A-i, B-iv, C-iii, D-i

B-iv, C-iii, D-i

D-i, C-iii, A-iv

A-iv, B-iii, C-ii

According to IUPAC; atomic mass is expressed in terms of

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H-1

C-12

O-16

Cl-35

A symbol not only represents the name of the element but also its

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Atomic mass

Atomicity

Atomic number

Atomic volume

The molecular formulas of sodium bicarbonate; sodium carbonate; magnesium nitrite; and magnesium nitrate are respectively

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NaHCO3, Na2CO3, Mg(NO2)2, Mg(NO3)2

NaCO3, Na2HCO3, Mg(NO2)2, Mg(NO3)2

NaHCO3, NaCO3, MgNO2, Mg(NO3)2

NaHCO3, Na2CO3, Mg(NO2)3, Mg(NO3)2

Which pair of formulae is correct? (Ca/Na/NH4/Mg set)

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Ca2SO4 and MgCl2

Na2HCO3 and Mg3(PO4)2

NH4HCO3 and K2SO4

CaNO3 and (NH4)2OH

The radicals present in sodium thiosulfate are

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1 Na+ and 2 S2O32-

2 Na+ and 1 S2O32-

2 Na+ and 1 S2O42-

2 Na+ and 1 SO42-

The formulas of sulphite; sulphate; bisulphate; and bisulphite are respectively

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SO42-, SO32-, S2O32- and HSO3-

SO32-, SO42-, S2O32- and HSO3-

SO32-, SO42-, HSO4- and HSO3-

SO32-, S2O32-, HSO3- and HSO4-

The molecular formulas of silver chloride; ferrous carbonate; and cupric nitrate are respectively

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AgCl, FeCO3 and Cu(NO3)2

AgCl2, Fe2CO3 and CuNO3

AgCl2, FeCO2 and Cu2NO3

AgCl, Fe2(CO3)3 and Cu(NO3)2

Which pair of formulae is correct? (Ag/NH4/K/Zn set)

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Ag2CO3 and (NH4)3NO3

K2HCO3 and Zn3(PO4)2

AgHCO3 and K3PO4

ZnCO3 and (NH4)2PO4

Which of the following is not a chemical change?

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Sublimation

Combustion

Electrolysis

Rusting

The formulas of sulphite; thiosulphate; chlorate; and perchlorate are respectively

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SO42-, S2-, Cl- and ClO-

SO42-, SO32-, ClO3- and ClO4-

SO32-, S2O32-, Cl- and ClO4-

SO32-, S2O32-, ClO3- and ClO4-

Which process is a chemical change?

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Boiling water

Dissolving sugar

Cooking an egg

Melting ice cubes

Relative atomic mass is

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Number of protons

Number of protons + number of electrons

The number of times an atom is heavier than an oxygen atom

Number of times an atom is heavier than 1/12th of the C-12 isotope