SSC Paper SCIENCE Maharashtra Board
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.