SSC Papers Science

SSC Papers Science Set II

Q.1.Fill in the Blanks                                                               (3)

1. The chemical formula for POP is _________

2. Phenolphthalein is _________ type of indicator.

3. ________ are used to prevent oxidation of foods.

Q.2.True or False                                                                    (2)

1. Methyl orange is an olfactory indicator.

2. Chemical reactions in which reactants gain oxygen is called reduction reaction.

Q.3.Find odd man out                                                           (1)

1. HCl, NaOH, H₂SO4, HNO₃.

Q.4.Answer the following                                                     (8)

1. Give Reason :Grills of doors and windows are always painted before they are used.

2. Give Reason :Sodium bicarbonate is used in fire extinguisher.

3. Write a balanced chemical equation :Carbondioxide is passed through calcium hydroxide.

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

a. H₂O + CO₂ →H₂CO₃

b. CuSO₄ + Zn → ZnSO₄ + Cu

Q.5. Answer the following                                                     (6)

1. What do you understand by the term redox reaction? Explain with one example.

2. With a neat labelled diagram explain pH scale.