Classification of Matter
Classification of Matter: Overview
This topic covers concepts, such as, Mixtures, Elements and Compounds, Non-Metals & Metalloids etc.
Important Questions on Classification of Matter
Which of the following filler material can be used for brazing?
Assertion (A): Air is a pure substance but a mixture of air and liquid air in a cylinder is not a pure substance.
Reason (R): Air is homogeneous in composition but a mixture of air and liquid air is heterogeneous.
Almost of Earth's crust is made up of eight elements. Which of the following does NOT figure among these elements?
What is the chemical symbol of Magnesium?
The horizontal rows in the modern periodic table are called_____.
When we cut an onion, the vegetable emits an odour, and our eyes tear up. Which of the following compounds is responsible for the tears and odour resulting from freshly cut onions?
Topaz is of fluorine and aluminium ____.
Which one of the following element is Monatomic unit?
Which of the following is one of the metals used in LED semiconductor technology?
The elements of the groups to are called ______ elements or transition elements.
Which of the following is NOT used to make toothpaste?
Halogens have _____ electrons in their outermost shells.
.....is the heat energy that has to be supplied to change the state of a substance:
When the liquid is rapidly spun, the denser particles sink to the bottom while the lighter particles float to the top. This principle is applied in which of the following situation?
In a heterogeneous system, which of the following is correct?
A pure material that has only one type of atom and cannot be broken down into two or more simpler compounds by physical or chemical techniques is termed as _____________.
Food cans are coated with tin but not with zinc because _____.
Which one of the following is used for manufacturing safety matches?
Why is ethylene dibromide added to petrol?
It increases the octane number of fuel.
It helps in the elimination of lead oxide.
It removes the sulfur compound in petrol.
It serves as a substitute for tetraethyl lead.
Select the correct answer using the codes given below.
What happened when a hard-boiled egg after shelling is immersed in saturated brine?
