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Acids Bases and Salts Test - 36

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Acids Bases and Salts Test - 36
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  • Question 1
    1 / -0
    A substance containing water of crystallization is known as a/an:
    Solution
    A salt associated with the water of crystallization is known as a hydrate (containing water). 
    Hence, the correct option is $$\text{C}$$.
  • Question 2
    1 / -0
    Acid rain causes damage to the historical monuments like Taj Mahal. Why?
    Solution
    Acid rain causes damage to historical monuments and other buildings. For example, the Taj Mahal, which is made of marble, is getting damaged because of a reaction to acid rain. Marble is a calcium carbonate that reacts with the acid and thus gets corroded.
  • Question 3
    1 / -0
    $$ 2H_3PO_4 + 3Na_2CO_3 \rightarrow $$
    What are the products formed?
    Solution
    On adding a carbonate to an acid, effervescence from carbon dioxide gas is released along with the formation of water and salt. 
    Phosphoric acid + sodium carbonate $$\rightarrow$$ sodium phosphate + water + carbon dioxide
    $$ 2H_3PO_4 + 3Na_2CO_3 \rightarrow 2Na_3PO_4 + 3H_2O + 3CO_2 $$
  • Question 4
    1 / -0
    Which of the following is a natural indicator?
    Solution
    Natural indicators are obtained from natural sources. All the above examples are natural indicators. A solution of china rose turns green in a basic solution, and bright pink or magenta in an acidic solution. Morning glories contain an anthocyanin called "heavenly blue anthocyanin" which changes from purplish red at $$pH\: 6.6$$ to blue at $$pH\: 7.7$$. Blueberries change from blue (around $$pH \:2.8-3.2$$) to red in a strongly acidic solution.
  • Question 5
    1 / -0
    Which of the following is used as a cleaning agent for domestic purposes and for softening hard water?
    Solution
    Sodium carbonate decahydrate ($$Na_2CO_3.10H_2O$$) also known as washing soda, is used as a cleaning agent and for softening hard water.
  • Question 6
    1 / -0
    Heated calcium sulphate with half a water of crystallization is commonly called as:
    Solution
    Plaster of Paris is chemically called calcium sulphate hemihydrate. Since, it is brought to use from Paris, called as "Plaster of Paris". It is prepared by heating gypsum at $$373K.$$ 
  • Question 7
    1 / -0
    Copper sulphate pentahydrate is commonly called _______, whereas ferrous sulphate heptahydrate is commonly called  ________ .
    Solution
    Copper sulphate pentahydrate ($$CuSO_4.5H_2O$$) commonly known as blue vitriol contains five water molecules, that give it a blue colour. Similarly, the green color of ferrous sulphate heptahydrate ($$FeSO_4.7H_2O$$) is due to the seven molecules of water present in it. 
  • Question 8
    1 / -0
    ? $$ \rightarrow BaSO_4(aq) + H_2O(l) $$
    What are the reactants used to carry out this reaction?
    Solution
    $$\textbf{Concept Applied:}$$ A neutralization reaction is when an acid and a base react to form water and salt and involves the combination of H+ ions and OH- ions to generate water. 
    $$\textbf{Correct Option:}$$ A
    $$\textbf{Explanation for correct option:}$$ The non-metal oxides can be neutralized with a base to form a salt and water.
    $$ SO_4(aq) + Ba(OH)_2(aq) \rightarrow BaSO_4(aq) + H_2O(l) $$
    $$\textbf{Explanation for incorrect options:}$$
    (B) $$HCl+Ba(OH)_2\rightarrow Bacl_2+H_2O$$
    (c) $$BaOH$$ not exist
  • Question 9
    1 / -0
    $$Na_2SO_4$$ has a $$pH$$ of:
    Solution
    Sodium sulphate ($$Na_2SO_4$$) is formed by a reaction between sodium hydroxide and sulphuric acid which are strong base and acid, respectively. Thus, it is a neutral salt with a $$pH$$ of 7.
  • Question 10
    1 / -0
    On adding $$HCl$$ to sodium bicarbonate containing a universal indicator, the color of indicator changes to ___________ and releases __________ .
    Solution
    Universal indicator added to $$NaHCO_3$$ is blue in color (universal indicator- blue = alkaline). When $$HCl$$ is added to this solution, the universal indicator changes to red colour and releases $$CO_2$$ gas (universal indicator- red = acidic). It also forms respective salt and water.

    $$ NaHCO_3   +    HCl   \rightarrow    NaCl   +   H_2O    +    CO_2   $$

    Dissolve $$CO_2$$ gas make the solution acid.

    $$H_2O+CO_2\rightarrow H_2CO_3$$
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