Among the following organic acids, the acid present in rancid butter is: 1) pyruvic acid 2) lactic acid 3) butyric acid 4) acetic acid
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Which of the following set of elements is written correctly in the order of their increasing metallic character? (a) Mg, Al, Si (b) C, O, N (c) Na, Li, ...
On moving from left to right in a period in the periodic table, the atomic number of elements increases. What happens to the size of the atoms of elements on moving from left to right in ...
Which one of the following does not increase while moving down the group of the periodic table: (a) Atomic radius (b) Metallic character (c) Valence electrons (d) Shells ...
The element which form a basic oxide has the atomic number of: (a) 18 (b) 17 (c) 14 (d) 19
The element which can form an acidic oxide should be the one whose atomic number is: (a) 6 (b) 16 (c) 12 (d) 19
The correct formula of the oxide of Eka-aluminium element predicted by Mendeleev’s was: (a) EaO3 (b) Ea2O2 (c) Ea2O3 (d) EaO
Which of the following are the correct characteristics of isotopes of an element? (i) Same atomic mass (ii) Same atomic number (iii) Same physical properties (iv) Same chemical properties ...
The atomic numbers of the elements Na, Mg, K and Ca are 11, 12, 19 and 20 respectively. The element having largest atomic radius is: (a) Mg (b) Na
The correct increasing order of the atomic radii of the elements oxygen, fluorine and nitrogen is: (a) O, F, N (b) N, F, O (c) O, N, F