Which of the following in a molar solution would be the pro duct conductor of electricity?
How many moles of oxygen atoms are presented in 4.0g of the gas. (O= 16)
In the periodic table, the entire element within the same group has the same
How many atoms are there in 0.3mole of an element? {Avogadro's constant =6.0 x10²³)
Milk exposed to air for a few days tastes sour due to the presence of ____.
A substance which produces the hydroxonium ion as the only positive ion when dissolved in water is
Petrol can be obtained from fuel oil by
Which of the following is not true of metals?
Which of the following is not a property of chlorine?
If calcium has atomic number 20 and mass number 40, the constituent of the atom is _____
In the reaction between sodium hydroxide and sulphuric acid solutions. What volume of 0.5molar sodium hydroxide would exactly neutralize 10cm³ of 1.25molar sulphuric acid?
A small quantity of solid ammonium chloride (NH4Cl) was heated gently in a test tube. The solid gradually disappear to produce a mixture of two gases later a white cloudy deposit was observed on the cooler part of the test tube. The ammonium chloride is said to have undergone
Elements P, Q, R, S have 6, 11, 15, & 17 electrons respectively. Therefore
An element X forms the following compounds with chlorine NCl4, XC3. XC2 this illustrates the
The oxidation state of chlorine in potassium chlorate is ______.
When carbon dioxide is bubbled into limewater, a white precipitate is formed. If the passage of the gas is continued, the precipitate disappears. The reasons for this is _____
The following reactions are stages in important industrial processes
(i) N2(g) + O2 – 2NH3(g) ∆H is
negative
(ii) 2SO2(g) + O2(g) – 2S03(g) ∆H is
negative
(iii) N2(g) + O3(g) – 2NO(g) ∆H is
positive.
Which of the above forward reactions is favoured by a decrease in the concentration of the pressure and an increase in temperature?
Methanoic acid mixes with water in all proportions and has about the same boiling point as water. Which of the following methods would you adopt to obtain pure water from a mixture of sand, water and methanoic acid
Which of the following statements applies during the electrolysis of sodium hydroxide solution using platinum electrodes?
Which of the following statement is true? When the potassium atom forms its ion