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2 mL of sodium hydroxide solution is added to a few pieces of granulated zinc metal taken in a test tube. When the contents are warmed, a gas evolves which is bubbled through a soap solution before testing. Write the equation of the chemical reaction involved and the test to detect the gas. Name the gas which will be evolved when the same metal reacts with dilute solution of a strong acid.
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What is the general name of chemical substances which bring about control and coordination in plants?
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Which of the following is not a plant hormone?
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Which of the processes, sexual reproduction or asexual reproduction, bring about maximum variations in the offsprings?
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Name one variation in humans connected with ears.
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Name an animal in which individuals can change sex. What does this indicate?
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On what basis is a chemical equation balanced?
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State whether the following statement is true or false:
A chemical equation can be balanced easily by altering the formula of a reactant or product.
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What is wrong with the following chemical equation?
\[\ce{Mg + O -> MgO}\]
Correct and balance it.
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What does the symbol (aq) represent in a chemical equation?
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How will you indicate the following effect in a chemical equation?
A solution made in water.
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How will you indicate the following effect in a chemical equation?
Exothermic reaction
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How will you indicate the following effect in a chemical equation?
Endothermic reaction
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Translate the following statement into a chemical equation and then balance the equation:
Phosphorus burns in oxygen to give phosphorus pentoxide.
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Translate the following statement into a chemical equation and then balance the equation:
Carbon disulphide burns in air to give carbon dioxide and sulphur dioxide.
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Translate the following statement into a chemical equation and then balance the equation:
Aluminium metal replaces iron from ferric oxide, Fe2O3, giving aluminium oxide and iron.
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Translate the following statement into a chemical equation and then balance the equation:
Barium chloride reacts with zinc sulphate to give zinc chloride and barium sulphate.
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Give one example of a chemical reaction.
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Complete and balance the following equation:
\[\ce{NaOH + {..........} -> Na2SO4 + H2O}\]
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Complete and balance the following equation:
\[\ce{Ca(OH)2 + {..........} -> CaCO3 + H2O}\]
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