Nkojọpọ....
|
Tẹ mọ́ & Dì mú láti fà yíká. |
|||
|
Tẹ ibi lati pa |
|||
Ibeere 1 Ìròyìn
The number of hydrogen ions in 1.0dm6.00x103 of a 0.25 mole dm6.00x10-3 tetraoxosulphate(Vl) acid solution is
[Avogadro constant = 6.0 x 1 0]
Awọn alaye Idahun
Ibeere 2 Ìròyìn
At s.t.p, a mole of chlorine occupies 22.4dm3. If the temperature is changed to 35°C and the pressure to 750mHg the of the new volume will be [Cl = 35.5]
Awọn alaye Idahun
Ibeere 6 Ìròyìn
Which formula is used to indicate the degree of acidity of an acid?
Awọn alaye Idahun
Ibeere 7 Ìròyìn
What change will occur to the equilibrium mixture
\( 2CrO^{2-}_4(aq) + 2H^+(aq) ⇔ Cr_2O^{2-}_7(aq) + H_2O(l) \) when excess sodium hydrogen solution is added?
Awọn alaye Idahun
Ibeere 9 Ìròyìn
What mass of copper is deposited when 6.5g of granulated zinc reacts with excess copper(II) tetraoxosulphate(VI) solution?
The equation for the reaction is: Zn(s) + \( CuSO_4(aq)→ ZnSO_4(aq)+ Cu(s)\)[CU= 64; Zn=65]
Awọn alaye Idahun
Ibeere 11 Ìròyìn
Which method is used for the purification of copper from its ore?
Awọn alaye Idahun
Ibeere 12 Ìròyìn
What change will occur during the electrolysis of brine using carbon electrodes?
Awọn alaye Idahun
Ibeere 13 Ìròyìn
An atom of element X has an electronic configuration of \( 1s^22p^33s^23p^2. \) In which group of the periodic table is X?
Awọn alaye Idahun
Ibeere 16 Ìròyìn
What is the number of moles of NaHCO3in 250cm3 of its solution if the solution contains 8.4 g of NaHCO3 in 1 dm3 of the solution. [Na = 23, 0 = 16, C = 12, H = 1)
Awọn alaye Idahun
Ibeere 18 Ìròyìn
In the reaction 2H2S(g) + SO2(g) → 2H2SO(I)+3S(s)SO2is acting as _agent
Awọn alaye Idahun
Ibeere 19 Ìròyìn
Why is tetraoxosulphate(VI) acid NOT used for making carbon dioxide from calcium carbonate? It is
Awọn alaye Idahun
Ibeere 21 Ìròyìn
B is an isotope of the element \(^{238} _{92}Ur\). The isotope B has
Awọn alaye Idahun
Ibeere 22 Ìròyìn
What is the concentration (in mol dm3) of a solution containing 28 g of potassium hydroxide per 100 cm3 of solution? (K=39; H=1; 0=16)
Awọn alaye Idahun
Ibeere 23 Ìròyìn
Why does the treatment of cotton fabrics with dilute acids weaken the materials?
Awọn alaye Idahun
Ibeere 25 Ìròyìn
An organic compound gave the following results on analysis: C = 29.3% ; H = 5.7%; Br = 65%.
What is the empirical formula of the compound? [C = 12, H = 1, Br=80]
Awọn alaye Idahun
Ibeere 28 Ìròyìn
What is the change in the oxidation number of phosphorus in the following reaction?
4P(s) + 5O2(ag) → 2P2O5(s)
Awọn alaye Idahun
Ibeere 30 Ìròyìn
How many Faradays of electricity are required to liberate 9g of aluminium? [Al = 27]
Awọn alaye Idahun
Ibeere 31 Ìròyìn
Naturally occurring lithium consists of 90% \( ^7_3Li \text{ and 10% } ^6_3 Li. \) What is the relative atomic mass of lithium?
Awọn alaye Idahun
Ibeere 32 Ìròyìn
Which separation technique is routinely applied in the petroleum industry?
Awọn alaye Idahun
Ibeere 34 Ìròyìn
What mass of silver is deposited when a current of 2.6 A is passed through a solution of a silver salt for 40 minutes? [Ag= 108 ; F=96500C]
Awọn alaye Idahun
Ibeere 35 Ìròyìn
Ethene decolourises acidified potassium tetraoxomanganate(VII) solution. Which gas will decolourise bromine water?
Awọn alaye Idahun
Ibeere 36 Ìròyìn
Small amounts of compounds of transition metals are sometimes added to glass during manufacture in order to make the glass
Awọn alaye Idahun
Ibeere 38 Ìròyìn
The boiling point of water is higher than the boiling point of ethanol because
Awọn alaye Idahun
Ṣe o fẹ tẹsiwaju pẹlu iṣe yii?