Question
Write short notes on the following: Electroplating.

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In the reaction represented by the following equation:
$\text{CuO(s)}\ +\ \text{H}_2(\text{g})\xrightarrow{\ \ \ \ \ \ \ \ \ \ \ \ }\text{Cu(s)}\ +\ \text{H}_2\text{O(1)}$
  1. Name the substance oxidised.
  2. Name the substance reduced.
  3. Name the oxidising agent.
  4. Name the reducing agent
Complete the chart - Classification of living organisms
The pancreas is made up of two parts A and B. The part A secretes insulin whereas part B secretes pancreatic juice.
  1. Which part is functioning as an endocrine gland? Why?
  2. What is insulin and what effect does it have in the body?
  3. Name the disease which can be treated by giving insulin injection.
  4. What does pancreatic juice contain? Where does pancreatic juice go?
  5. Name the life process in which pancreatic juice is made use of.
A Mendelian experiment consisted of breeding tall pea plants bearing violet flowers with short pea plants bearing white flowers. The progeny all bore violet flowers, but almost half of them were short. This suggested that the genetic make up (or genotype) of the tall parent can be depicted as:
  1. TTWW
  2. TTww
  3. TtWW
  4. TtWw
Give reason for your choice.
When a person eats sugary food, then organisms A present in his mouth act on sugar to produce a substance B. The substance B first dissolves the calcium salts from the top part C of the tooth and then from its middle part D forming holes E. These holes ultimately reach the part F in the lower part of tooth which contains nerves and blood vessels. The substance B irritates the nerve endings inside the tooth causing toothache.
  1. What are (i) organisms A, and (ii) substance B?
  2. What are (i) part C, and (ii) part D, of tooth known as?
  3. By what name are the holes E in the tooth known?
  4. Name the part F of the tooth.
  5. What will happen if organisms A reach part F of the tooth known?
Explain Bayer’s process.
With the help of a diagram, derive the formula for the resultant resistance of three resistors connected in series.
Explain the need and importance of space missions.
 How can the rate of the chemical reaction, namely, decomposition of hydrogen peroxide be increased?
When a mixture of gases $X$ and $Y$ is compressed to $300$atm pressure and then passed over a catalyst consisting of a mixture of zinc oxide and chromium oxide $($heated to a temperature of $300^\circ C),$ then an organic compounds $Z$ having the molecular formula $CH_4O$ is formed. $X$ is a highly poisonous gas which is formed in appreciable amounts when a fuel burns in a limited supply of air; $Y$ is a gas which can be made by the action of a dilute acid on an active metal; and $Z$ is a liquid organic compound which can react with sodium metal to produce hydrogen gas:
  1. What are $X, Y$ and $Z?$
  2. Write a balanced chemical equation of the reaction which takes place when $X$ and $Y$ combine to form $Z.$ Indicate the conditions under which the reaction occurs.