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
Calcium carbonate is naturally available as limestone and can also be synthesized from quick lime.
It is seen that the compositions of the elements in both the natural and synthetic calcium carbonate are same.
The validity of which one among the following laws is confirmed by this observation?
Law of conservation of mass
Law of definite proportion
Law of multiple proportion
Avogadro’s law
When aqueous solutions of two salts are mixed, the third salt formed may appear as a solid precipitate or a clear solution depending upon the solubility of its ions. It is observed that all salts of Na, K, NH4 are soluble. All nitrates and bicarbonates are also soluble. All halides (chlorides, bromides, iodides) are soluble except those of Ag, Hg (I) and Pb. All sulphates are soluble except those of Ag, Ca, Ba and Pb.
Which one among the following combinations of solutions will produce a solid precipitate?
Sodium sulphate and barium chloride
Magnesium sulphate and barium bicarbonate
Lithium iodide and barium chloride
Ammonium sulphate and potassium bromide
A mixture containing Si02, NaCl and NH4C1 is taken for separating the constituents. The suitable steps required for this are
Sublimation - dissolution - filtration - crystallisation
Dissolution — filtration - crystallisation — distillation
Sublimation - evaporation - dissolution - decomposition
Dissolution — distillation - decomposition — evaporation
Iodised salt is a
Mixture of potassium iodide and common salt
Mixture of molecular iodine and common salt
Compound formed by combination of molecular iodine and common salt
Only potassium iodide
Which one among the following is a chemical process ?
Distillation of sea (salty) water
Crystallisation of impure salt (NaCl)
Production of Iodine (I2) from sea-weeds
Sublimation of iodine (I2)
