When a green iron salt is heated strongly, its colour finally changes to black and odour of burning sulphur is given out
Name the type of reaction that takes place during the heating of iron salt.

When a green iron salt is heated strongly, its colour finally changes to black and odour of burning sulphur is given out Name the iron salt.

Which type of chemical reactions take place when Limestone is heated.

When iron is heated with sulphur, iron sulphide is formed. What is the reaction called?

Name the product formed on strongly heating ferrous sulphate crystals. What type of chemical reaction occurs in this change?

When heated above 916^(@)C , iron changes its bcc crystalline from to fcc without the change in the radius of atom . The ratio of density of the crystal before heating and after heating is :

On heating copper powder in air, the surface of copper powder becomes coated with black CuO. How can this black be converted into brown copper? Write chemical equation for the reaction that occurs during the colour change.

Read the given passage and answers following questions : The particles of colloidal solution possess electrical charge which is responsible for the stability of these solutions. The charge on colloidal particles arises because of selective adsorption of ions which are common with their own lattice. The presence of charge on colloidal particles can be determined with the help of phenomenon known as electrophoresis. However, when some electrolyte is added, the charge on the particles of, dispersed phase gets neutralized and precipitation takes place. This process is also called coagulation. The coagulation is given by Hardy Schulze rules. According to these rules the ions carrying the charge opposite to that of sol particles are effective and coagulating power of an electrolyte is directly proportional to the fourth power of the valency of the ion. Coagulation can also occur by mutual precipitation , by electrophoresis, by persistent dialysis or by heating or cooling. Answer the following questions : Name the other ways by which coagulation can occur.

Write balanced chemical equation and identify the type of chemical reaction taking place when: Quick lime reacts vigorously with water releasing a large amount of heat.

Direction. In the follwing questions, a statement of assertion is followed by a statement of reason. While answering a question, you are required to choose the correct are out of the given four responses and mark it as (A). If both assertion and reason are true and reason is the correct explanation of the assertion, (B) if both assertion and reason are true but reason is not correct explanation of the assertion. (C) if asssertion is true, but reason if false, (D) if both assertion and reason are false Assertion : When a magnet is heated to a high temperature (cogn 1,000^@C) it loses its magnetism. Reason: The temperature of 1,000^@C is quite above the Curie temperature for iron.