Which one of the following elements does not form solid hydrogen carbonate?

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Q: 12 (CDS-II/2016)

Which one of the following elements does not form solid hydrogen carbonate?

question_subject: 

Science

question_exam: 

CDS-II

stats: 

0,12,85,16,13,32,36

keywords: 

{'solid hydrogen carbonate': [0, 0, 0, 1], 'elements': [0, 0, 2, 5], 'caesium': [0, 0, 0, 7], 'potassium': [1, 0, 0, 2], 'sodium': [10, 2, 12, 23], 'lithium': [0, 0, 3, 6]}

The correct answer is option 2: Potassium.

Solid hydrogen carbonates, also known as bicarbonates, are compounds that contain the bicarbonate ion (HCO3-) combined with a metal ion. This combination forms a salt that is solid at room temperature.

Sodium hydrogen carbonate (NaHCO3), also known as baking soda, is a common example of a solid hydrogen carbonate. Caesium hydrogen carbonate (CsHCO3) and lithium hydrogen carbonate (LiHCO3) are also examples of solid hydrogen carbonates.

However, potassium (K) does not form a solid hydrogen carbonate. Potassium bicarbonate (KHCO3) does exist, but it is not a solid at room temperature. Instead, it is a white crystalline powder that can be easily dissolved in water.

Therefore, the correct option is 2: Potassium does not form a solid hydrogen carbonate.