Question

Which of the following statements is incorrect? (a) Hydrogen is the most abundant element in the universe (b) The giant planets Jupiter and Saturn consist mostly hydrogen (e) The isotopes of hydrogen have different physical properties (d) Hydrogen is used to reduce lighter metal oxides (more active than iron) to metals. ​

Answer 1

Answer:

e is incorrect statement

Answer 2

Of the following statements (d) Hydrogen is used to reduce lighter metal oxides (more active than iron) to metals is incorrect.

• Hydrogen is considered to be the most abundant in the universe as it's believed from the Big Bang theory's massive explosion that resulted in formation of two major gases mainly hydrogen and helium where hydrogen is the most abundant one. Hence, option a is correct.
• The outer planets are also called as the gas giants. Jupiter and Saturn are largest and second largest respectively. The gas giants are mainly formed of hydrogen. Hence, option b is correct.
• Isotopes have similar chemical properties but different physical properties due to difference in their atomic masses. Hence, all isotopes of hydrogen have different physical properties. Hence, c is correct.
• Hydrogen can only reduce metals oxides that lie below it on the reactivity series. Hence, it won't be able to reduce metals more active than iron. Hence, option d is incorrect.