EmSAT EmSAT Chemistry 3

Question 1

What is the oxidation state of sulfur in H₂SO₄?

Accepted Answer

+6

Answer

−2

Answer

0

Answer

+4

Question 2

What is a redox reaction?

Accepted Answer

A reaction where electrons are transferred between species

Answer

A reaction involving only acids

Answer

A reaction producing water only

Answer

A reaction at constant temperature

Question 3

Which element is reduced in: Zn + CuSO₄ → ZnSO₄ + Cu?

Accepted Answer

Copper

Answer

Zinc

Answer

Sulfur

Answer

Oxygen

Question 4

What is the rate of a chemical reaction?

Accepted Answer

The change in concentration of reactants/products per unit time

Answer

The energy released

Answer

The change in temperature

Answer

The pressure during reaction

Question 5

Which factor does NOT affect reaction rate?

Accepted Answer

Color of the reactants

Answer

Temperature

Answer

Concentration

Answer

Catalyst

Question 6

What is a catalyst?

Accepted Answer

A substance that speeds up a reaction without being consumed

Answer

A substance consumed in a reaction

Answer

A substance that increases activation energy

Answer

A product of the reaction