Which one of the following anions is present in the chain structure silicates?
Si2O
(Si2O2-5)n
(SiO32-)n
SiO
Identify the correct statement.
Gypsum is obtained by heating plaster of Paris
Plaster of Paris can be obtained by hydration of gypsum
Plaster of Paris is obtained by partial oxidation of gypsum
Gypsum contains a lower percentage of calcium than plaster of Paris
H3PO2 is the molecular formula of an acid of phosphorus. Its name and basicity respectively are
phosphorus acid and 2
hypophosphorus acid and 2
hypophosphorus acid and one
hypophosphoric acid and two
Bleaching powder reacts with a few drops of conc HCl to give
chlorine
hypo chlorous acid
calcium oxide
oxygen
Which of the following does not show electrical conduction?
Potassium
Graphite
Diamond
Sodium
Zn gives H2 gas with H2SO4 and HCl but not with HNO3 because
Zn act is oxidising agent when react with HNO3
HNO3 is weaker acid than H2SO4 and HCl
In electrochemical series Zn is placed above hydrogen
NO is reduced in preference to hydronium ion
Reapeated use of which one of the following fertilizers would increase the acidity of the soil?
Urea
Superphosphate of lime
Ammonium sulphate
Potassium nitrate
In borax bead test which compound is formed?
ortho borate
meta borate
double oxide
tetra borate
Which among the following is paramagnetic?
Cl2O
ClO2
Cl2O7
Cl2O6
Which of the following statements is not true?
HOCl is a stronger acid than HOBr
HF is a stronger acid than HCl
Among halide ions, iodide is the most powerful reducing agent
Fluorine is the only halogen that does not show a variable oxidation state
