Chemical Reactions and Equations

What type of chemical reaction results in the formation of a single product?

• combustion

• synthesis

• decomposition

• displacement

Answer explanation

Synthesis reactions have the general form: A + B --> AB

Which of the following is a product that can be formed by double displacement reactions?

• gas

• precipitate

• water

• all of these

Tags

NGSS.MS-PS1-5

• Zn

• H

• S

• O

Which of the following equations represents a decomposition reaction?

Answer explanation

Decomposition reactions have the general form AB --> A + B

Tags

NGSS.MS-PS1-2

• double displacement reaction

• synthesis reaction

• decomposition reaction

• combustion reaction

Answer explanation

Double displacement reactions have the general form: AB + CD --> AD + CB

Tags

NGSS.MS-PS1-5

• double displacement reaction

• synthesis reaction

• decomposition reaction

• combustion reaction

Answer explanation

Combustion reactions are typically some fuel + O2 gas. When the fuel contains only C, H (and possibly O), the products are CO2 and H2O. This makes these reactions easy to identify.

Which of the following statements about the given reaction are correct? 3Fe(s) + 4H2O(g) ® Fe3O4(s) + 4H2(g) (i) Iron metal is getting oxidised (ii) Water is getting reduced (iii) Water is acting as reducing agent (iv) Water is acting as oxidising agent

• (a) (i), (ii) and (iii)

• (b) (iii) and (iv)

• (c) (i), (ii) and (iv)

• (d) (ii) and (iv)

Tags

NGSS.MS-PS1-2

The following reaction is used for the preparation of oxygen gas in the laboratory 2KClO₃ (s) + Heat --Catalyst--> 2KCl (s) + 3O₂ (g) Which of the following statement(s) is(are) correct about the reaction?

• (a) It is a decomposition reaction and endothermic in nature

• (b) It is a combination reaction

• (c) It is a decomposition reaction and accompanied by release of heat

• (d) It is a photochemical decomposition reaction and exothermic in nature

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-4

Which of the following are combination reactions?

• (a) (i) and (iii)

• (b) (iii) and (iv)

• (c) (ii) and (iv)

• (d) (ii) and (iii)

Tags

NGSS.HS-PS1-7

Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of the reaction involved?

• (i) Displacement reaction

• (ii) Precipitation reaction

• (iii) Combination reaction

• (iv) Double displacement reaction