MCQ : Is Matter Around Us Pure - 1


10 Questions MCQ Test Science Class 9 | MCQ : Is Matter Around Us Pure - 1


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This mock test of MCQ : Is Matter Around Us Pure - 1 for Class 9 helps you for every Class 9 entrance exam. This contains 10 Multiple Choice Questions for Class 9 MCQ : Is Matter Around Us Pure - 1 (mcq) to study with solutions a complete question bank. The solved questions answers in this MCQ : Is Matter Around Us Pure - 1 quiz give you a good mix of easy questions and tough questions. Class 9 students definitely take this MCQ : Is Matter Around Us Pure - 1 exercise for a better result in the exam. You can find other MCQ : Is Matter Around Us Pure - 1 extra questions, long questions & short questions for Class 9 on EduRev as well by searching above.
QUESTION: 1

A pure substance/element contains

Solution:

A pure substance has a constant composition and cannot be separated into simpler substances by physical means. Elements: are pure substances made up of only 1 type of atom. Atoms of the same element are identical in properties.

QUESTION: 2

The smell of hydrogen sulphide (H2S) gas

Solution:

Hydrogen sulfide is a flammable, colorless gas with a characteristic odor of rotten eggs. It is commonly known as hydrosulfuric acid, sewer gas, and stink damp. People can smell it at low levels.

QUESTION: 3

Which of the following is not a mixture? 

Solution:

Carbon dioxide is not a mixture since it contain fixed ratio of oxygen and carbon in 2:1, which is a property of compound not a mixture.

QUESTION: 4

 Which of the following is a true solution? 

Solution:

Salt solution is a true solution.

QUESTION: 5

Which of the following is a chemical change? 

Solution:

 

Cooking of food is a chemical change because after cooking, the raw ingredients or the vegetables cannot be regained again in the raw form.

QUESTION: 6

The process of separation of insoluble solids from a liquid is called:

Solution:

Filtration is a method for separating an insoluble solid from a liquid. When a mixture of sand and water is filtered: the sand stays behind in the filter paper (it becomes the residue ) the water passes through the filter paper (it becomes the filtrate )

QUESTION: 7

Which of the following has the highest solubility at 313 K? 

Solution:
QUESTION: 8

An example of a liquid metal and a liquid non-metal is 

Solution:

Mercury is the only liquid metal and bromine is the only liquid non-metal. 

Mercury :

-Mercury is the only metal that is a liquid at normal temperatures and pressure. 

-Because of the behavior of the valence electrons, mercury has a low melting point, is an electrical and thermal conductor and doesn't form diatomic mercury molecules in the gas phase

Bromine:-

Bromine has 35 electrons and with7 electrons in its outer shell it has a valency of 1 so, is very reactive. 

But, the electrons are very spread out from the atomic nucleus, hence it behaves like a liquid.

- It is non-metallic because it is a halogen gas that is liquid at STP.

QUESTION: 9

Alloys are 

Solution:

Alloys are homogeneous mixtures of two or more elements. The elements could be two metals, or a metal and a non-metal.

QUESTION: 10

Brass is an example of a 

Solution:

Brass is an alloy made up of uniform composition of copper and zinc. It is a homogeneous mixture in which zinc and copper can be varied to create a range of brasses with varying properties.

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