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Which one of the following is the correct arrangement of metals in the decreasing order of their reactivity?

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Important Questions on Elements, Compounds and Mixtures

HARD
Chemistry>Introduction to Chemistry>Elements, Compounds and Mixtures>Elements
Where would you locate the element with electronic configuration 2, 8 in the Modern Periodic Table ?
EASY
Chemistry>Introduction to Chemistry>Elements, Compounds and Mixtures>Elements
Which of these cannot be placed under the category of elements?
EASY
Chemistry>Introduction to Chemistry>Elements, Compounds and Mixtures>Elements
Which one is not a compound?
MEDIUM
Chemistry>Introduction to Chemistry>Elements, Compounds and Mixtures>Elements
For each of the following, use letters to indicate whether the matter is element (E), compound (C) or mixture (M).
S. No. Matter Classification
1. Water   
2.  Mercury  
3.  Air  
4.  Tin  
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Chemistry>Introduction to Chemistry>Elements, Compounds and Mixtures>Elements

Read the passage and answer the following questions:

Element is the simplest form of a pure substance which cannot be divided further into another simple substance. Thus, we can say that it is made up of only one kind of atoms. Out of 114 elements known today, 92 are natural and rest are made by man. Elements can be classified as :

Metals, non-metals, metalloids, inert gases. To identify the elements, usually a symbol is assigned, e.g., C is the symbol for carbon. Elements are different from compounds, as they cannot be broken down further, whereas a compound can be broken down. Both elements and compounds are pure substances.

  1. Which of the following elements is not solid at room temperature?
EASY
Chemistry>Introduction to Chemistry>Elements, Compounds and Mixtures>Elements
Column I Column II
A. C12 H22 O11 (i) Element
B. Soda water (ii) Homogeneous mixture
c. Mist (iii) Compound
D. H2 (iv) Heterogeneous mixture

 

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Chemistry>Introduction to Chemistry>Elements, Compounds and Mixtures>Elements
There are about 118 different
EASY
Chemistry>Introduction to Chemistry>Elements, Compounds and Mixtures>Elements
An element is made up of only one kind of -
EASY
Chemistry>Introduction to Chemistry>Elements, Compounds and Mixtures>Elements
Element is the simplest form of a pure substance which cannot be divided further into another simple substance. Thus, we can say that it is made up of only one kind of atoms. Out of 114 elements known today, 92 are natural and the rest are made by man. Elements can be classified as:
Metals, non-metals, metalloids, inert gases. To identify the elements, usually, a symbol is assigned, e.g., C is the symbol for carbon. Elements are different from compounds, as they cannot be broken down further, whereas a compound can be broken down. Both elements and compounds are pure substances.
Rn, Ar, Xe  are all symbols of
MEDIUM
Chemistry>Introduction to Chemistry>Elements, Compounds and Mixtures>Elements
Two chemical species X and Y combine together to form a product P which contains both X and Y
X+Y→P 
X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following concerning the species X, Y and P are correct?
(i) P is a compound
(ii) X and Y are compounds
(iii) X and Y are elements
(iv) P has a fixed composition
EASY
Chemistry>Introduction to Chemistry>Elements, Compounds and Mixtures>Elements
Which of the following statements are true for pure substances? 
(i) Pure substances contain only one kind of particles. 
(ii) Pure substances may be compounds or mixtures. 
(iii) Pure substances have the same composition throughout. 
(iv) Pure substances can be exemplified by all elements other than nickel. 
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Chemistry>Introduction to Chemistry>Elements, Compounds and Mixtures>Elements
The element which is not common between the compounds called baking soda and soda ash is:
EASY
Chemistry>Introduction to Chemistry>Elements, Compounds and Mixtures>Elements
Which of these can be classified as elements?

Salt, water, hydrogen, sodium, oxygen

EASY
Chemistry>Introduction to Chemistry>Elements, Compounds and Mixtures>Elements
The substance made up of only one type of particle is
HARD
Chemistry>Introduction to Chemistry>Elements, Compounds and Mixtures>Elements
Which of the following pairs does not contain both elements?
EASY
Chemistry>Introduction to Chemistry>Elements, Compounds and Mixtures>Elements
Which of these elements are liquid in state?
EASY
Chemistry>Introduction to Chemistry>Elements, Compounds and Mixtures>Elements
Which of the following is the smallest unit of matter that has an independent existence?
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Chemistry>Introduction to Chemistry>Elements, Compounds and Mixtures>Elements
Odd one among the following, which does not belong to the set is
EASY
Chemistry>Introduction to Chemistry>Elements, Compounds and Mixtures>Elements
Which of the following is a compound?
HARD
Chemistry>Introduction to Chemistry>Elements, Compounds and Mixtures>Elements
Two chemical substances X and Y combine together to form a product P which contains both X and Y.
X +Y → P
X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following statements concerning X, Y and P are correct?
(i) P is a compound                                     (ii) X and Y are electrons
(iii) X and Y are elements                          (iv) P have a fixed composition