Write the equation for the reaction that occurs at the cathode during the extraction of aluminum by electrolysis.

Use graph paper for this question. Take 1 cm = 1 unit on both x and y axes.

1. Plot the following points on your graph sheets: A (-4, 0), B (-3, 2), C (0, 4), D (4, 1) and E (7, 3)      
2. Reflect the points B,
...

Copper sulphate solution reacts with sodium hydroxide solution to form a precipitate of copper hydroxide according to the equation:

 2NaOH + CuSO₄ → Na₂SO₄ + Cu(OH)₂ ↓

(i) What mass of copper...

The IUPAC name of dimethyl ether is

1. Ethoxy methane
2. Methoxy methane
3. Methoxy ethane                                                                                                                                                                     
4. Ethoxy ethane

Gigantism and Acromegaly are due to:

1. Hyposecretion of Thyroxine.
2. Hyposecretion of Growth hormone
3. Hypersecretion of Thyroxine
4. Hypersecretion of Growth hormone

The kind of twins formed from two fertilised eggs. 

Give appropriate biological / technical term

Ionic compounds have a high melting point.

Name two products each of the following industries:

1. petrochemical industry.
2. heavy engineering industry.
3. electronic industry.

Read the extract given below and answer the questions that follow:

One Sunday morning, when the animals assembled to receive their orders, Napoleon announced that he had decided upon a new policy....

Given below is an experimental setup to demonstrate a particular tropic movement in germinating seeds. Study the diagram and answer the questions that follow:

1. Label the parts 1 and 2.
2. Name the
...

What was the Khilafat Movement?

Testosterone and Oestrogen [organ which secretes]

Differentiate between the following pairs on the basis of what is indicated in the brackets.

State any two functions of the UNICEF and any two functions of WHO.

An enemy plane is at a distance of 300 km from a radar. In how much time the radar will be able to detect the plane? Take velocity of radio waves as 3 x 10⁸ m s^-1.

Write a balanced chemical equation: Reaction of excess ammonia with chlorine.

Lead nitrate solution is mixed with dilute hydrochloric acid and heated.