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Tambaya 2 Rahoto
Which metal is extracted from bauxite?
Tambaya 3 Rahoto
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)
Tambaya 4 Rahoto
The pH of water is 7.
What is the pH of orange juice?
Tambaya 5 Rahoto
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?
Bayanin Amsa
Tambaya 6 Rahoto
What is the change in the oxidation number of phosphorus in the following reaction?
4P(s) + 5O2(ag) → 2P2O5(s)
Bayanin Amsa
Tambaya 8 Rahoto
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)
Bayanin Amsa
Tambaya 9 Rahoto
Which hydrocarbon does NOT exhibit structural isomerism?
Tambaya 10 Rahoto
Which metal bromide is widely used in photography?
Tambaya 11 Rahoto
Which is NOT a synthetic polymer?
Tambaya 13 Rahoto
Ethene decolourises acidified potassium tetraoxomanganate(VII) solution. Which gas will decolourise bromine water?
Tambaya 14 Rahoto
The boiling point of water is higher than the boiling point of ethanol because
Bayanin Amsa
Tambaya 15 Rahoto
Which element is the most electronegative?
Tambaya 16 Rahoto
A calcium atom and a calcium ion have the same
Tambaya 17 Rahoto
Which separation technique is routinely applied in the petroleum industry?
Bayanin Amsa
Tambaya 18 Rahoto
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]
Tambaya 19 Rahoto
In the reaction 2H2S(g) + SO2(g) → 2H2SO(I)+3S(s)SO2is acting as _agent
Bayanin Amsa
Tambaya 20 Rahoto
Naturally occurring lithium consists of 90% \( ^7_3Li \text{ and 10% } ^6_3 Li. \) What is the relative atomic mass of lithium?
Bayanin Amsa
Tambaya 21 Rahoto
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]
Bayanin Amsa
Tambaya 22 Rahoto
The reaction C2H6 → C2H + H2 is known as
Tambaya 24 Rahoto
Why is tetraoxosulphate(VI) acid NOT used for making carbon dioxide from calcium carbonate? It is
Bayanin Amsa
Tambaya 26 Rahoto
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]
Bayanin Amsa
Tambaya 27 Rahoto
What change will occur during the electrolysis of brine using carbon electrodes?
Bayanin Amsa
Tambaya 28 Rahoto
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]
Tambaya 30 Rahoto
Small amounts of compounds of transition metals are sometimes added to glass during manufacture in order to make the glass
Bayanin Amsa
Tambaya 31 Rahoto
Which statement is NOT true about the composition of starch?
Tambaya 32 Rahoto
An atom of element X has an electronic configuration of \( 1s^22p^33s^23p^2. \) In which group of the periodic table is X?
Tambaya 33 Rahoto
How many Faradays of electricity are required to liberate 9g of aluminium? [Al = 27]
Bayanin Amsa
Tambaya 34 Rahoto
What is the IUPAC name of CH3CCI=C(CH3)2?
Tambaya 36 Rahoto
Which metal is a constituent of both bronze and solder?
Tambaya 37 Rahoto
Why does the treatment of cotton fabrics with dilute acids weaken the materials?
Bayanin Amsa
Tambaya 38 Rahoto
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]
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