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Which of the following observations helps us to determine whether a chemical reaction has taken place?

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Important Questions on Chemistry

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General Knowledge>General Science>Chemistry>Fundamental Laws and Discoveries in Chemistry

Chemistry of carbon compounds is known is ______.

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General Knowledge>General Science>Chemistry>Fundamental Laws and Discoveries in Chemistry
Eka–Aluminum was named as __________ in the modern periodic table? 
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General Knowledge>General Science>Chemistry>Fundamental Laws and Discoveries in Chemistry
Hemoglobin in humans has the highest affinity for which of the following gases?
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General Knowledge>General Science>Chemistry>Fundamental Laws and Discoveries in Chemistry

______ is a process in which impure water is boiled, and the steam is collected and condensed in a separate container, leaving many of the solid contaminants behind.

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General Knowledge>General Science>Chemistry>Fundamental Laws and Discoveries in Chemistry
Which group of modern periodic table consists of elements with 2, 8, 6 electronic configuration? 
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General Knowledge>General Science>Chemistry>Fundamental Laws and Discoveries in Chemistry
In modern periodic table, zig-zag line separate _____:
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General Knowledge>General Science>Chemistry>Fundamental Laws and Discoveries in Chemistry
The absolute charge of the electron is _____.
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General Knowledge>General Science>Chemistry>Fundamental Laws and Discoveries in Chemistry
Which solution is isotonic with 6% w/v aqueous solution of urea? [Molar mass of Urea=60 gm. mol-1 ]
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General Knowledge>General Science>Chemistry>Fundamental Laws and Discoveries in Chemistry

For the third period of the periodic table, the shells maybe?

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General Knowledge>General Science>Chemistry>Fundamental Laws and Discoveries in Chemistry
Who discovered the proton, one of the fundamental particles of an atom?
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General Knowledge>General Science>Chemistry>Fundamental Laws and Discoveries in Chemistry
Among the following, the correct statement is:
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General Knowledge>General Science>Chemistry>Fundamental Laws and Discoveries in Chemistry
Dalton’s law is based on _____:

 
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General Knowledge>General Science>Chemistry>Fundamental Laws and Discoveries in Chemistry
One mole of dioxygen gas at STP is equal to
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General Knowledge>General Science>Chemistry>Fundamental Laws and Discoveries in Chemistry
Which of the following metals is found in free state in nature?
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General Knowledge>General Science>Chemistry>Fundamental Laws and Discoveries in Chemistry
What will be the mass of one atom of C12 ?
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General Knowledge>General Science>Chemistry>Fundamental Laws and Discoveries in Chemistry
Atomic mass of nitrogen is 14 u. Which of the following sample contain 6.022×1023 nitrogen atoms?
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General Knowledge>General Science>Chemistry>Fundamental Laws and Discoveries in Chemistry
Dispersed medium + Dispersion medium =
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General Knowledge>General Science>Chemistry>Fundamental Laws and Discoveries in Chemistry
The outer shell of which group of elements is complete in the modern periodic table?
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General Knowledge>General Science>Chemistry>Fundamental Laws and Discoveries in Chemistry
What conclusion can be drawn from C612 about carbon atom? 
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General Knowledge>General Science>Chemistry>Fundamental Laws and Discoveries in Chemistry
Which is the first element to be artificially produced?