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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