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NECO CHEMISTRY PRACTICAL ANSWERS NUMBER 1 ANOTHER VERSION *(1a)* Tabulate Volume of pipette used=25cm3. Indicator used= Methyl orange Under Titration, Rough, 1st, 2nd, 3rd, Final burette reading; |25.00| |23.40| |23.50| 23.60| Initial burette reading; |0.00| |0.00| |0.00| |0.00| Volume of A used; |25.00| |23.40| |23.50| |23.60| *(1ai)* Average volume of Acid used=23.40+23.50+23.60/3 =70.5/3=23.50cm3 *(1aii)* This is because it is a reaction between a weak acid and strong base *(1aiii)* A funnel should be used while transferring the acid into the burette. . *(1bi)* Conc of A in mol|dm³ =? Conc of A in g|dm³ = 12.75g|dm³ Molar mass of A, NaHSO⁴ = 23+1+32+64 =120g|dm³ From. Conc(mol/dm³) = conc(g/dm³)/molar mass Conc =12.75/120 Conc =0.106mol/dm³ *(1bii)* Con of B in mol/dm³ =? Ca =0.106, Cb =? Va =23.50cm³, Vb =25.00cm³ na=1 , nb=1 From; CaVa/CbVb=na/nb Cb=CaVanb/Vbna Cb=0.106*23*50*1/25.00*1 Cb=2.5/25 Cb=0.1mol/dm³ *(1biii)* Conc of B in g/dm³=? Molar mass of B , NaOH=23+16+1=40g/mol From; conc(g/dm³)=conc(mol/dm³)*molar mass =0.1*40 =4.0g/dm³ *(1biv)* Mass of salt formed =? Recall mole of NaHSO⁴=? From; mole =con(mol/dm³)*vol(cm³)/1000 Mole=0.106*23.50/1000 Mole=0.0025mol of NaHSO⁴ By proportion 1mol of NaHSO⁴ produce 1mol of Na²SO⁴ 0.0025mol of NaHSO⁴ will produce X mol of Na²SO⁴ X=0.0025*1=0.0025mol of NaSO⁴ Molar mass of Na²SO⁴=(23*2) + 32 + (16*4) =46+32+64 =142g/mol Recall; mole =mole/molar mass Mass =mole * molar mass Mass =0.0025*142 Mass =0.36g of Na²SO⁴ ==================================== [27/06, 9:34 pm] null: NECO CHEMISTRY PRACTICAL NUMBER 2 *(2a)* TEST C + 5cm³ of distilled water OBSERVATION It dissolve completely INTERFERENCE C is a soluble salt *(2bi)* TEST Solution + NaOH + Heat OBSERVATION Effervescence occurs in which a colourless gas with pungent smell and turns red litmus paper to blue is given off. INFERENCES NH³ gas from NH⁴+ is present *(2bii)* TEST Stirring rod of HCL + gas given off OBSERVATION a gas which gives a pop sound is given off INFERENCES H² is present *(2ci)* TEST Solution C + drops of BaCL² OBSERVATION a white precipitate is formed INFERENCES CO²^-3, SO²^-4, SO²^-3, May be present. *(2cii)* TEST Solution in C(i) + dil HCL OBSERVATION the white precipitate dissolve is dil HCL and effervescence occurs in which a colourless and odourless gas which turns blue litmus red and lime water milky is given off INTERFERENCE CO² gas from CO²^3- confirmed ==================================== [27/06, 9:41 pm] null: NECO 2025 CHEMISTRY PRACTICAL ANSWERS NUMBER 3 *(3a)* (i)Ca²+ (ii)Pb²+ (3bi) concentrated acid can be defined as an acid formed when a large quantity of an acid dissolve in a small or little volume of water. *(3bii)* A strong acid is defined as a type of acid that ionize completely in a solution *(3c)* Activated charcoal is used as an adsorbent material *(3d)* (i)Reddish - Brown (ii) I - red, II - brown. ==================================== Completed!

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Each region, Northern, Western, Mid-Western, and Eastern, retained autonomy over matters like education, health, and local governance, while the federal government managed defense, foreign affairs, and currency. (iii) Parliamentary system: Nigeria continued to operate under a parliamentary system of government. The Prime Minister, who was the head of government, was chosen from the majority party in the federal House of Representatives and held executive powers, while the President performed mainly ceremonial duties. (iv) Bicameral legislature: The Constitution provided for a two-chamber National Assembly consisting of the Senate and the House of Representatives. This bicameral structure ensured representation of both regional and national interests in the lawmaking process. (v) Judicial independence: The Constitution established a Supreme Court as the highest court of appeal, with powers to interpret the Constitution and ensure justice. Judges were appointed independently, reinforcing the principle of separation of powers and protecting the judiciary from political interference. (vi) Citizenship and fundamental rights: The Constitution defined Nigerian citizenship and guaranteed fundamental human rights such as freedom of speech, religion, movement, and protection from discrimination. These provisions aimed to promote national unity and protect individual liberties within the diverse Nigerian society. *NECO HISTORY* *NUMBER NINE* (9) (i) Formation of political parties: Nigerian nationalists established political parties to mobilize support and challenge colonial rule. These parties, such as the Nigerian National Democratic Party (NNDP) and later the National Council of Nigeria and the Cameroons (NCNC), served as platforms for demanding self-governance and organizing political activities across the country. (ii) Use of the press: Nationalists used newspapers and journals to educate the public, criticize colonial policies, and spread nationalist ideas. Publications written in both English and local languages helped raise political awareness and unify diverse groups around the goal of independence. (iii) Petitions and constitutional negotiations: Nationalist leaders engaged in formal dialogue with the British government through petitions and participation in constitutional conferences. They used these forums to demand gradual constitutional reforms that expanded Nigerian participation in governance. (iv) Public protests and rallies: Organized demonstrations, rallies, and strikes were used to express mass dissatisfaction with colonial rule. These peaceful protests often involved students, workers, and market women, showing broad-based support for the nationalist cause and pressuring colonial authorities. (v) Educational campaigns: Nationalists promoted education as a tool for liberation. They established schools and supported learning as a means to empower Nigerians intellectually and politically, creating a class of educated citizens who could challenge colonial dominance. (vi) Collaboration and alliances: Nationalist leaders formed coalitions and alliances across ethnic and regional lines to present a united front. Despite ideological differences, they worked together in conferences and political movements to demand greater autonomy and eventually full independence from British rule.