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Oxyacetylene flame is used for iron-welding because it
Sodium metal is always kept under oil because it
Transition metals possess variable oxidation states because they have
Alloys are best prepared by
Aluminium hydroxide is used in the dyeing industry as a
Carbon is tetravalent because
Sulphur (IV) oxide bleaches by
When steam is passed over red-hot carbon, the substances produced are
Which of the following gases can be collected by the method of downward delivery?
The allotrope of carbon used in the decolourization of sugar is
Which of the following shows little or no net reaction when the volume of the system is decreased?
N\(_2\)O\(_4\),(g) ↔ 2NO\(_2\)(g)
In the endothermic reaction above, more product formation will be favoured by
Which of the following hydrogen halides has the highest entropy value?
2CO(g) + O\(_2\)(g) → 2CO\(_2\)(g)
Given that ΔH[CO]is -110.4 kJmol-1 and ΔH[CO\(_2\)] is -393.0 kJmol-1, the energy change for the reaction above is
The mass of silver deposited when a current of 10A is passed through a solution of silver salt for 4830s is
[Ag = 108, 1F = 96500 Cmol-1]
In the electrolysis of brine, the anode is
Which of the following acts as both reducing and oxidizing agent?
ZnO(s) + CO(g) → Zn(s) + CO\(_2\)(g)
In the reaction above, Zinc has been
The oxidation state of chlorine in HClO\(_4\) is
What volume of 0.5 mol dm\(^{-3}\) H\(_2\)SO\(_4\) will exactly neutralize 20cm\(^3\) of 0.1 mol dm\(^{-3}\) NaOH solution?