Which of the following is used for disinfecting drinking water?
Which of the following statements is INCORRECT?
I) Bleaching powder is a pale yellow powder
II) Dry NH3 gas turns red litmus blue
III) The pH of rain water is nearly 7
IV) The pH of acid rain is nearly 5.6
There are 15 protons and 22 neutrons in the nucleus of an element. What is its mass number?
The element with the highest electron affinity among halogens is
An unbalanced chemical equation is called a
When large quantities of ___ are consumed, it tends to slow metabolic processes and to depress the central nervous system.
When iron is exposed to moist air, a reddish brown coating of hydrated Iron (III) Oxide (Fe2O3) is deposited on its surface. This reddish brown coating is called
In the Modern Periodic Table elements present in the same period will have the same
Plaster of Paris ______.
I. changes into gypsum on mixing with water
II. is CaSO4.2H2O
III. is used for decoration
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