Dolomite is a double carbonate, $$\(\mathrm{CaMg}\left(\mathrm{CO}_{3}\right)_{2}\)$$, and can be used instead of calcium carbonate for treating acidic soils. The three statements all refer to the agricultural use of these carbonates. 1 Dolomite and calcium carbonate are both less soluble than $$\(\mathrm{Ca}(\mathrm{OH})_{2}\)$$. 2 One mole of dolomite has the same neutralising effect as one mole of calcium carbonate. 3 Dolomite and calcium carbonate both increase the pH of acidic soils. Which statements are correct?
A.
1 and 2 only
B.
1 and 3 only
C.
2 and 3 only
D.
1, 2 and 3
Exam No：9701_m24_qp_12 Year：2024 Question No：20
Answer:
B
Knowledge points:
10.1.1 describe, and write equations for, the reactions of the elements with oxygen, water and dilute hydrochloric and sulfuric acids
10.1.2 describe, and write equations for, the reactions of the oxides, hydroxides and carbonates with water and dilute hydrochloric and sulfuric acids
10.1.3 describe, and write equations for, the thermal decomposition of the nitrates and carbonates, to include the trend in thermal stabilities
10.1.4 describe, and make predictions from, the trends in physical and chemical properties of the elements involved in the reactions in 10.1.1 and the compounds involved in 10.1.2, 10.1.3 and 10.1.5
10.1.5 state the variation in the solubilities of the hydroxides and sulfates
Solution:
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