Related InterviewSolutions

• A white powder is used by doctors to support fractured bones. (a) Write the name and chemical formula fo the powder. (b) How is this powder (c) When this white powder is mixed with water, a hard solid mass is obtained. Write a balanced chemical equations for the changes. (d) Give one more use of this white powder.
• When potassium iodide solution is added to a solution of lead (II) nitrate in a test tube, a precipitate is formed. (a) What is the colour of this precipitate? Name the compound precipitated. (b) Write the balanced chemical equation for this rection. (c) List two types of reactions in which this reaction can be placed.
• What happens when 5% alkaline potassium permanganate solution is added drop by drop to warm propyl alcohol (propanol) taken in a test tube? Explain with the help of a chemical equation.
• Distinguish between esterification and saponification reactions of organic compounds with the help of the chemical equation for each. Write one use of (i) esters and (ii) saponification process?
• Name one plant hormone which inhibits growth. Write its one more function.
• (a) Define reflex action. State its significance. (b) How do plants respond to external stimuli ?
• The rate of breathing in aquatic organisms is much faster than that seen in terrestrial organisms. Give reason. State the pathway of air form nostrials to the lungs in human beings. or Mention three characterisitc features of hormonal secretions in human beings.
• (a) In electrolysis of water, why is the volume of gas collected over one electrode double that gas collected over the other electrode ? (b) (i) What is observed whern a solution of potassium iodide is added to a solution of lead nitrate taken in a test tube ? (ii) What type of reaction is this ? (iii) Write a balanced chemical equation to represent the above reaction.
• List two observation you would record in your notebook 30 minutes after adding iron filling to copper sulphate solution.
• You are provided with a container made up of aluminium. You are also provided with solutions of dil HCl, dil `HNO_(3), ZnCl_(2)` and `H_(2)O`. Out of these solutions which solution, can bekept in the aluminium container ? Name the type of reaction taking place.