SSC Papers Science

SSC Papers Science Set I

Q.1.Fill in the Blanks                                                               (3)

1. Corrosion can be prevented by using ____________.

2. Most of the acidic substances are ______ to taste.

3. Chemical formula for rust is_________.

Q.2.True or False                                                                    (2)

1. The pH of rainwater is 7.

2. Antioxidants are used to prevent oxidation.

Q.3.Find odd man out                                                           (1)

1. NaOH, Ca(OH)₂, NH₄OH, HCl

Q.4.Answer the following                                                     (8)

1. Give Reason : Edible oil is not allowed to stand for a long time in an iron or tin container.

2. Give Reason : Baking powder is used in preparation of spongy bread and cakes.

3. Write a balanced chemical equation : sodium carbonate is treated with dilute hydrochloric acid.

4. Classify the following reactions as combination, decomposition, displacement or double displacement reaction.

a.      CaCO₃ →CaO + CO₂

b.      K₂CrO₄ + BaSO₄ → BaCrO₄ + K₂SO₄

Q.5. Answer the following                                                     (6)

1. What is corrosion? How it can be prevented?

2. With a neat labelled diagram explain pH scale.