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Class XI Chemistry S Block 3
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Question 1
In Nessler’s reagent, the ion present is
Question 2
Iron exhibits + 2 and +3 oxidation states. Which of the following statements about iron is incorrect?
Question 3
The main oxides formed on combustion of Li, Na and K in excess of air are, respectively:
Question 4
Which statement is wrong?
Question 5
Match compounds given in (X) with their use in (Y) –
A | Liquid Na metal | 1 | Breathing apparatus submarine |
B | Potassium stearate | 2 | Explosive |
C | Potassium superoxide | 3 | Coolant in nuclear reactor |
D | Potassium nitrate | 4 | Soft soap |
Hence correct order is -
Question 6
A chemistry student trying to detect the metallic ion in a salt, makes a paste on the clean Pt wire-loop of the salt with concentrated HCl. When he takes a small amount of this paste and keeps it in a non-luminous Bunsen flame, the colour of the flame changes to grassy green. He, should therefore conclude that the metal is -
Question 7
The metals Li, Na, K and Rb and their salts, when introduced into flame, give the following characteristic colour to flame -
Question 8
The ionic radii of alkali metal ions in water (hydrated radii) are in the order -
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Nov 8NEET & AIIMS