Chemistry in Everyday Life — Chemistry STD 12 — Question

Which of the following d-block elements has the highest electrical conductivity at room temperature?

Which one of the following is an intermediate product in Stephen’s reaction?

Which one of the complex salt is acting as a photo sensitiser in photosynthesis process?

Consider the following statements.
(i) Enzyme catalysed reaction has maximum rate at optimum temperature
(ii) Enzyme catalysis is highly specific in nature
(iii) Catalytic activity of enzyme is decreased by coenzyrnes or activators.
Which of the above statement is / are not correct?

Consider the following statements.
(i) The outer sphere in coordination compound is called ionisation sphere.
(ii) The primary valences are non directional while secondary valences are directional.
(iii) The primary valances of a metal ion is negative and it is satisfied by positive ions.
Which of the above statements is/are not correct? .

AgCl precipitate dissolves in ammonium hydroxide due to the formation of ……………..

Which one of the following is called Hexane – 1, 6 – diamine?

Which type of leaching process convert insoluble sulphide ores into soluble sulphates?

Among the following, which is the strongest oxidizing agent?