Wird geladen....
|
Drücken und Halten zum Ziehen |
|||
|
Hier klicken, um zu schließen |
|||
Frage 1 Bericht
Naturally occurring lithium consists of 90% \( ^7_3Li \text{ and 10% } ^6_3 Li. \) What is the relative atomic mass of lithium?
Antwortdetails
Frage 2 Bericht
The reaction C2H6 → C2H + H2 is known as
Frage 3 Bericht
An atom of element X has an electronic configuration of \( 1s^22p^33s^23p^2. \) In which group of the periodic table is X?
Antwortdetails
Frage 4 Bericht
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)
Frage 5 Bericht
The boiling point of water is higher than the boiling point of ethanol because
Antwortdetails
Frage 6 Bericht
Which compound will give propane when it Is dehy drated by an excess of hot, concentrated tetraoxosvlphate(VI) acid?
Antwortdetails
Frage 10 Bericht
What is the change in the oxidation number of phosphorus in the following reaction?
4P(s) + 5O2(ag) → 2P2O5(s)
Antwortdetails
Frage 13 Bericht
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)
Antwortdetails
Frage 14 Bericht
B is an isotope of the element \(^{238} _{92}Ur\). The isotope B has
Antwortdetails
Frage 15 Bericht
How many Faradays of electricity are required to liberate 9g of aluminium? [Al = 27]
Antwortdetails
Frage 16 Bericht
The pH of water is 7.
What is the pH of orange juice?
Frage 17 Bericht
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]
Frage 18 Bericht
Which separation technique is routinely applied in the petroleum industry?
Antwortdetails
Frage 19 Bericht
Small amounts of compounds of transition metals are sometimes added to glass during manufacture in order to make the glass
Antwortdetails
Frage 20 Bericht
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]
Antwortdetails
Frage 22 Bericht
Which statement is NOT true about the composition of starch?
Frage 23 Bericht
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?
Antwortdetails
Frage 24 Bericht
Which is NOT a synthetic polymer?
Frage 26 Bericht
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]
Frage 27 Bericht
Ethene decolourises acidified potassium tetraoxomanganate(VII) solution. Which gas will decolourise bromine water?
Frage 28 Bericht
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]
Antwortdetails
Frage 29 Bericht
Why is tetraoxosulphate(VI) acid NOT used for making carbon dioxide from calcium carbonate? It is
Antwortdetails
Frage 30 Bericht
What is the IUPAC name of CH3CCI=C(CH3)2?
Frage 31 Bericht
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]
Frage 33 Bericht
What change will occur during the electrolysis of brine using carbon electrodes?
Antwortdetails
Frage 35 Bericht
Which hydrocarbon does NOT exhibit structural isomerism?
Frage 36 Bericht
Why does the treatment of cotton fabrics with dilute acids weaken the materials?
Antwortdetails
Frage 38 Bericht
In the reaction 2H2S(g) + SO2(g) → 2H2SO(I)+3S(s)SO2is acting as _agent
Antwortdetails
Möchten Sie mit dieser Aktion fortfahren?