Please ans Q23 Q23. Which of the following equations are incorrect? Give reason. i) H2 SO4 + Cu →CuSO4 + H2 ii) 2K + H2O →K2O + H2 iii) 2Mg + O2 → 2MgO Mg + H2O → Mg (OH)2
Q.10. a) What happens when copper is left exposed to air?
Write chemical equation too.
b) Identify the element in following cases:
i) the most malleable metal.
ii) the hardest substance known.
iii) the lustrous nonmetal.
iv) the liquid nonmetal at room temperature.
Sodium is stored in kerosene.
Don't give links,plz.
Please ans Q23
Q23. Which of the following equations are incorrect? Give reason.
i) H2 SO4 + Cu CuSO4 + H2
ii) 2K + H2O K2O + H2
iii) 2Mg + O2 2MgO
Mg + H2O Mg (OH)2