Which of the following species has the largest ionic radius?
A. S2− B. K+ C. CI− D. Ca2+ Correct Answer: Option D = Ca2+ Ecplanation: Atomic radius is determined as the distance between the nuclei of two identical atoms bonded together. The atomic radius of atoms generally decreases from left to right across a period. The...
What is the empirical formula of a hydrocarbon containing 0.160 moles of carbon and 0.640 moles of hydrogen
A. CH2 B. CH3 C. CH4 D. C2H4 Correct Answer: Option C = CH4
Student Y carried out the same exercise but used phenolphthalein as an indicator. Which of the following statements about the titration is true?
Student X titrated 25 cm3 of Na2CO3 with 0.1 mol dm−3 HCI, using methyl orange as an indicator. Student Y carried out the same exercise but used phenolphthalein as an indicator. Which of the following statements about the titration is true? A. hydrogen chloride gas...
The Bohr model of the atom proposed the existence of
A. the nucleus B. electron shells C. nucleons D. neutrons Correct Answer: Option B – electron shells
The 25°C evaporation of a 100 cm³ solution of K2CO3 to dryness gave 14g of the salt. What is the solubility of K2CO3 at 25°? [K2CO3 = 138]
A. 0.01 mol dm−3 B. 0.101 mol dm−3 C. 1.01 mol dm−3 D. 10.0 mol dm−3 Correct Answer: Option C – 1.01 mol dm−3Products
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