Question 1: Which of the following is not a physical change?
Answer: (d) Combustion of Liquefied Petroleum Gas (LPG)
Question 2: The following reaction is an example of a
4NH3 (g) + 5O2 (g) ⇨ 4NO + 6H2O
Answer: (c) (i) and (iii)
Question 3: Which of the following statements about the given reaction are correct?
3Fe (s) + 4H2O (g) ⇨ Fe3O4 (s) + 4H2 (g)
Answer: (c) (i), (ii) and (iv)
Question 4: Which of the following are exothermic processes?
Answer: (a) (i) and (ii)
Question 5: Three beakers labelled as A, B and C each containing 25 mL of water were taken. A small amount of NaOH, anhydrous CuSO4 and NaCl were added to the beakers A, B and C respectively. It was observed that there was an increase in the temperature of the solutions contained in beakers A and B, whereas in case of beaker C, the temperature of the solution falls. Which one of the following statement(s) is (are) correct?
Answer: (c) (i) and (iv)
Question 6: A dilute ferrous sulphate solution was gradually added to the beaker containing acidified permanganate solution. The light purple colour of the solution fades and finally disappears. Which of the following is the correct explanation for the observation?
Answer: (d) KMnO4 is an unstable compound and decomposes in presence of FeSO4 to a colourless compound.
Question 7: Which among the following is (are) double displacement reaction(s)?
Answer: (b) (ii) Only
Question 8: Which among the following statement(s) is (are) true? Exposure of silver chloride to sunlight for a long duration turns grey due to
Answer: (b) (i) and (iii)
Question 9: Which one of the following processes involve chemical reactions?
Answer: (d) Heating copper wire in presence of air at high temperature
Question 10: Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by liberation of heat. This process is called slaking of lime. Calcium hydroxide dissolves in water to form its solution called lime water. Which among the following is (are) true about slaking of lime and the solution formed?
Answer: (b) (ii) and (iii)
Copyright © excellup 2014