Indian army has published the notification for SSC Tech 56 men and SSC Tech 27 women for the course commencing at OTA Chennai from April 2021
Magnesium ribbon is cleaned with sandpaper before burning in air. Choose the correct reason amongst the following statements
(I) Magnesium is a very reactive metal.
(II) A layer of magnesium oxide prevents further reaction.
(III) Magnesium reacts with nitrogen to form nitrites.
(IV) The melting point of magnesium is very high.
I and II
I and III
II, III and IV
All of these
The scatter light beam passing through the solution and make its path visible called -
Laser path
Suspension
Brownian movement
Tyndall effect
When two solutions having same osmotic pressure at a given temperature are called _______ solutions.
Hypotonic
Isotonic
Hypertonic
Isosmotic
A pure solution of glucose is made and kept aside. The lab assistants accidentally spilt little NaCl in the solution and refrained from reporting that to the student who was experimenting. On measuring the boiling point of the glucose solution, the change that can occur would be:
A decrease in boiling point
An increase in boiling point
No change in boiling point
Cannot be predicted
Which solution is used to preserve biological specimens in laboratories?
Formalin
Vinegar
Benzaldehyde
