Sublimation of Iodine is a
(a) Chemical change
(b) Physical change
(c) Natural change
(d) Undesirable change
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The property of an element to exist in two or more physical forms with same chemical properties but different physical properties is called
C) allotropy
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Write a note on sublimation.
1. All substances do not pass through the three states: solid-liquid-gas. 2. There are certain substances which normally pass from the solid to the vapour state directly and vice versa. 3. The...
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Which of the following cannot be separated by sublimation when it is mixed with Sand A) Salt
Correct option is A) Salt
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Uma : Mass is neither created nor destroyed during a chemical reaction. Rama : Matter is conserved in a chemical reaction.
A) Uma is correct, Rama is incorrect.
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Assertion (A) : All the chemical equations must be balanced. Reason (R) : Atoms are either created or destroyed in chemical reaction.
C) ‘A’ is correct, but ‘R’ is incorrect.
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The sum of physical and biological factors along with their chemical interactions that effect an organism is called …………
(C) Environment
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According to Mendeleev’s periodic law, the physical and chemical properties of elements are the periodic function of their …………..
Correct option is: (A) atomic weights According to Mendeleev's periodic law, the Physical and Chemical properties of elements are the periodic function of their atomic weight
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According to Mendeleev’s periodic law, the physical and chemical properties of elements are the periodic function of their …………..
2 Answers
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Rising and setting of the sun at a given place is a 1. periodic change. 2. undesirable change.
Rising and setting of the sun at a given place is a periodic change.
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Assertion : Chemical messenger gives message to the cell without entering the cell. Reason: Chemical messenger is received at the binding site of rece
Correct Answer - B Reason is the correct explanation of the assertion.
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