Advertisements
Advertisements
Question
Care must be taken while diluting concentrated nitric acid with water. Why?
Solution
A highly exothermic reaction occurs when an acid or a base dissolves in water. Mixing concentrated nitric acid with water requires caution. Always slowly pour the acid into the water while stirring constantly. The heat produced when water is added to a concentrated acid can cause the mixture to splash out and hurt people's bums. Additionally, excessive local heating could cause the glass container to shatter.
APPEARS IN
RELATED QUESTIONS
In the extraction of aluminium: Name the process of concentration of bauxite.
Name the gas produced when calamine ore is calcined.
Identify the process given in following passage and draw neat labelled diagram showing the process.
Electrolysis of molten mixture of alumina (melting point > 20000C) is done in a steel tank. The tank has a graphite lining on the inner side. This lining does the work of a cathode. A set of graphite rods dipped in the molten electrolyte works as anode. Cryolite (Na3AlF6) and fluorspar (CaF2) are added in the mixture to lower its melting point upto 10000C.
Define the term : Gangue
Write equations for each of the above metal which reacts with water.
X is an element in the form of a powder. X burns in oxygen and the product is soluble in water. The solution is tested with litmus. Write down only the word which will correctly complete each of the following sentences:
(a) If X is a metal, then the litmus will turn ______.
(b) If X is a non-metal, then the litmus will turn ______.
(c) If X is a reactive metal, then ______ will be evolved, when X reacts with dilute sulphuric acid.
(d) If X is a non -metal, it will form _ oxide, which will form ______ solution with water.
(e) If X is a non -metal, it will not conduct electricity unless it is carbon in the form of ______.
Which one of the following is not true of metal :
Metals are good conductors of electricity.
Which one of the following is not true of metal :
Metals form non-polar covalent compounds
Explain the concept of Roasting.
A mineral from which the metal can be extracted economically and conveniently is known as ______.
