Question
Which of the following metals does not liberate hydrogen
gas when reacted with cold water but does so with steam?Solution
Magnesium reacts very slowly with cold water, and the reaction may not be observable at room temperature. However, when heated with steam, magnesium reacts more vigorously, forming magnesium oxide (MgO) and hydrogen gas (H ₂ ). Reaction with steam: Mg (s) + H ₂ O (g) → MgO (s) + H ₂  (g)
In the following question, select the wrong number from the given alternatives.
43, 50, 64, 85, 113, 138
Select the wrong term in the series.
312, 320, 304, 328, 295, 336
Select the number from among the given options that is wrong in the following series.
22, 30, 46, 78, 146, 270
A series is given with one wrong term. Select the wrong number from the given series.
15, 27, 41, 57, 74, 95, 117
Find the wrong number in the series given below.
5, 16, 50, 157, 463, 1394
Find the wrong number in the given series?
43, 47, 51, 56, 61, 67, 73, 80, 89
Select the wrong number from the given alternatives.
64, 32, 32, 48, 98, 240
Find the wrong number in the given series.
45, 50, 60, 80, 120, 180, 360
Find the wrong number in the given series.
17, 17, 51, 255, 1789, 16065
Find the wrong term in the series given below.
38, 44, 32, 50, 24, 56, 20Â
