To identify a cation metal in a nitrate salt. A student conduct a flame test. Predict the colour of the flame when student conduct a flame test with sodium nitrate.

• yellow

• red

• blue

• purple

Which element could be a transition metal ?

• Metal A = form colourless nitrate salt, low density, moderate melting point

• Metal B = form colourless nitrate salt, high density, high melting point

• Metal C = form coloured nitrate salt, high density, high melting point

• Metal D = form coloured nitrate salt, high density, low melting point

The reactions of metals A, B, C, and D are shown.

A + water = slow reaction;

B + water = no reaction;

C + water = vigorous reaction;

D + water = very slow reaction

What is the order of reactivity of the metals from least reactive to the most reactive ?

• A, B, C, D

• B, D, A, C

• C, A, D, B

• B, A, D, C

What is the method to prevent rusting of iron fences ?

• Painting

• Coating with zinc

• Covered with plastic

• Washing with weak acid

Which one shows the correct elements present in a certain alloy ?

• Steel = mixture of copper and carbon

• Brass = mixture of copper and iron

• Bronze = mixture of copper and tin

Type of isomerism shown by 3 – methyl pentane and 2 – methyl pentane ?

• Chain

• Position

• Geometry

Type of isomerism shown by hexane and 2,2 – dimethyl butane ?

• Chain

• Position

• Geometry

The chemical formula of an alkane ?

• C₈H₁₆, C₉H₁₈

• C₇H₁₆, C₁₀H₂₂

• C₉H₁₆, C₁₁H₂₄

Which one is the name of the isomers of the structure shown below ?

CH₃ – CH₂ – CH₂ – CH₂ – CH₃

• Pentane

• 2, 2 – dimethyl propane

• 3 – methyl pentane

• 3 – methyl butane

Petroleum can be separated into fractions. Which fractions has the lowest boiling point ?

• Bitumen

• Kerosene

• Diesel

• Refinery gas