Fill in the blanks with correct choices given in brackets.
(i) Basic radical formed by aluminium is__________. [Al²⁺/Al³⁺]
(ii) Using carbon dioxide and water,__________ is formed by plants in the presence of sunlight. [Galactose/Glucose]
(iii) The formula of green solid chromium oxide obtained on heating orange colored ammonium dichromate is__________ [CrO₂/Cr₂O₃]
(iv) Bombarding beryllium atom with alpha particles results in formation of carbon isotope and__________[electron/neutron]
(v) The maximum number of electrons in L shell is....[18/8]
Answers
Answer:
al+2 , glucose Cr2 O3................
Filling in the blanks with correct choices :
(i) Basic radical formed by aluminium is Al³⁺ .
• Al has an atomic number of 13. Therefore, its electronic arrangement is 2, 8, 3.
• Al has 3 valence electrons which it readily loses to form a basic radical and combine with another element.
• Therefore, Al forms a basic radical of Al³⁺ .
(ii) Using carbon dioxide and water, glucose is formed by green plants in the presence of sunlight.
• 6CO₂ + 6H₂O + sunlight + chlorophyll → C₆H₁₂O₆ + 6O₂
Plants prepare their food in the presence of sunlight in the form of glucose.
(iii) The formula of green solid chromium oxide obtained on heating orange colored ammonium dichromate is Cr₂O₃ .
• (NH4)₂Cr₂O₇ + ∆ → Cr₂O₃ + N₂ + 4H₂O
(iv) Bombarding beryllium atom with alpha particles results in the formation of a carbon isotope and neutron.
• An alpha particle is a positively charged particle with 2 protons and 2 neutrons, used for radioactive reactions.
• Be + ⁴₂α → ¹²₆C + ¹₀n
(v) The maximum number of electrons in L shell is 8.
• Number of electrons in a shell is given as 2n², where n is the number of the shell.
• L denotes the 2nd shell.
• Therefore, number of electrons in L shell = 2 × 2² = 8