Remedial - PT, Redox, Speed, ABS

Remedial - PT, Redox, Speed, ABS

7th Grade

5 Qs

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Remedial - PT, Redox, Speed, ABS

Remedial - PT, Redox, Speed, ABS

Assessment

Quiz

Chemistry

7th Grade

Practice Problem

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Created by

Staff Seet Seok Beng Stella

Used 1+ times

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5 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Which statement is correct when a mixture of ammonium carbonate and aqueous potassium hydroxide is warmed?

A gas is produced which forms white precipitate in limewater.

A gas is produced which turns damp blue litmus paper red.

A gas is produced which turns damp red litmus paper blue.

A gas is produced which extinguishes a lighted splint with a “pop” sound.

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

In which equation(s) does the oxidation state of manganese decrease?

(1)  MnO2   +    4HCl  →   MnCl2   +  Cl2   +   2H2O

(2)  MnO4- +  8H+  +  5Fe2+  →  5Fe3+  +  Mn2+  + 4H2O

(3)  2Mn(OH)2 +  H2O2  →   Mn2O3  +  3H2O

1, 2 and 3

1 and 2 only

2 and 3 only

3 only

3.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Using your knowledge of the halogens and their compounds, which statement(s) is/are correct?

(1) Silver astatide is an ionic compound.

(2) Bromine displaces astatine from a solution of potassium astatide.

(3) Astatine is a gas at room temperature.

1 and 2

1 and 3

2 only

3 only

4.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Which property of aluminium suggests it is not a transition metal?

conducts electricity

high melting point

low density

malleable

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which diagram shows the graphs of reaction 1 & 2 (volume of hydrogen produced, V, against time, t) ?

 

Reaction 1:

10 g of magnesium ribbon with excess 2.0 mol/dm3 hydrochloric acid

Reaction 2:

 5 g of magnesium powder with excess 2.0 mol/dm3 hydrochloric acid

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