Inapakia....
|
Bonyeza na Ushikilie kuvuta kuzunguka |
|||
|
Bonyeza Hapa Kufunga |
|||
Swali 1 Ripoti
Ethene decolourises acidified potassium tetraoxomanganate(VII) solution. Which gas will decolourise bromine water?
Maelezo ya Majibu
Swali 2 Ripoti
B is an isotope of the element \(^{238} _{92}Ur\). The isotope B has
Maelezo ya Majibu
Swali 3 Ripoti
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)
Maelezo ya Majibu
Swali 4 Ripoti
The boiling point of water is higher than the boiling point of ethanol because
Maelezo ya Majibu
Swali 6 Ripoti
What change will occur during the electrolysis of brine using carbon electrodes?
Maelezo ya Majibu
Swali 7 Ripoti
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?
Maelezo ya Majibu
Swali 8 Ripoti
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]
Maelezo ya Majibu
Swali 10 Ripoti
Why does the treatment of cotton fabrics with dilute acids weaken the materials?
Maelezo ya Majibu
Swali 11 Ripoti
Which compound will give propane when it Is dehy drated by an excess of hot, concentrated tetraoxosvlphate(VI) acid?
Maelezo ya Majibu
Swali 14 Ripoti
What is the change in the oxidation number of phosphorus in the following reaction?
4P(s) + 5O2(ag) → 2P2O5(s)
Maelezo ya Majibu
Swali 15 Ripoti
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]
Maelezo ya Majibu
Swali 16 Ripoti
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]
Maelezo ya Majibu
Swali 17 Ripoti
How many Faradays of electricity are required to liberate 9g of aluminium? [Al = 27]
Maelezo ya Majibu
Swali 19 Ripoti
Naturally occurring lithium consists of 90% \( ^7_3Li \text{ and 10% } ^6_3 Li. \) What is the relative atomic mass of lithium?
Maelezo ya Majibu
Swali 23 Ripoti
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]
Maelezo ya Majibu
Swali 24 Ripoti
In the reaction 2H2S(g) + SO2(g) → 2H2SO(I)+3S(s)SO2is acting as _agent
Maelezo ya Majibu
Swali 28 Ripoti
Which separation technique is routinely applied in the petroleum industry?
Maelezo ya Majibu
Swali 29 Ripoti
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)
Maelezo ya Majibu
Swali 32 Ripoti
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]
Maelezo ya Majibu
Swali 33 Ripoti
Small amounts of compounds of transition metals are sometimes added to glass during manufacture in order to make the glass
Maelezo ya Majibu
Swali 34 Ripoti
An atom of element X has an electronic configuration of \( 1s^22p^33s^23p^2. \) In which group of the periodic table is X?
Maelezo ya Majibu
Swali 35 Ripoti
Why is tetraoxosulphate(VI) acid NOT used for making carbon dioxide from calcium carbonate? It is
Maelezo ya Majibu
Swali 38 Ripoti
Which formula is used to indicate the degree of acidity of an acid?
Maelezo ya Majibu
Je, ungependa kuendelea na hatua hii?