Which of the following hydroxides is not readily soluble in water?
- A. NH\(_4\)OH
- B. Ca(OH)\(_2\)
- C. NaOH
- D. KOH
Which of the following oxides has a giant covalent structure?
- A. Al\(_2\)O\(_3\)
- B. Na\(_2\)O
- C. P\(_4\)O\(_10\)
- D. SiO\(_2\)
The bond between NH\(_3\) and H\(^+\) in NH4\(^+\) is?
- A. dative
- B. covalent
- C. hydrogen
- D. electrovalent
When 250 cm3 of a saturated solution of CuSO\(_4\) at 30ยฐC was evaporated to dryness, 5.0 g of the salt was obtained..
What is the solubility of the salt at 30ยฐC? [CuSO\(_4\) = 160]
- A. 0.031
- B. 0.125
- C. 0.640
- D. 1.560
What volume of oxygen at s.t.p is required to burn completely 7.5 dm\(^3\) of methane according to the following equation?
CH\(_4\) \(_g\) + 20\(_2\) \(_g\) โ CO\(_2\) \(_g\) + H\(_2\)O\(_g\)
- A. 3.75 dm\(^3\)
- B. 7.59 dm\(^3\)
- C. 15.0 dm\(^3\)
- D. 30.0dm\(^3\)
The initial volume and pressure of a given mass of gas is V and 3.P. What is its pressure if its volume is increased to 2V at constant temperature?
- A. 3 P
- B. 2P
- C. \(frac{3}{2}\) P
- D. \(frac{2}{3}\) P
f 5.0 cm\(^-3\) of 0.200 mol dm(^-3\) Na\(_2\)CO\(_3\) was diluted to 250cm(^-3\) solution, what would be the concentration of the resulting solution?
- A. 0.004 mol dm(^-3\)
- B. 0.020 mol dm(^-3\)
- C. 0.200 mol dm(^-3\)
- D. 0.400 mol dm(^-3\)
Which of the following standard conditions is not correct about energy changes?
- A. Standard temperature is 298K
- B. B. Standard pressure is 1 atm
- C. Concentration of solution must be 1 mol/dm\(^3\)
- D. ฮH at 298 K is the activation energy
Which of the following reactions are always exothermic? 1. Neutralization Il. Decomposition III. Combustion
- A. I and II only
- B. I and III only
- C. II and IIl only
- D. I, II and III
Which of the following statements is correet for a reaction at equilibrium?
- A. All reactions cease to occur
- B. The eaction has gone to completion
- C. The rates of the forward and backward reactions are equal
- D. The amount of product equals the amount of reactants
Which of the following substances is not a reducing agent?
- A. C
- B. CO
- C. O\(_2\)
- D. H\(_2\)
Which of the following compounds would release hydrogen when reacted with sodium metal?
I. CH\(_3\)COOH
II. CH\(_3\)CH\(_2\)OH
III. CH\(_3\)COOCH\(_3\)
- A. I only
- B. I and II only
- C. Il and IIl only
- D. I and Ill only
An alkanol containing 60% carbon by mass would have a molecular formula [H=1.0. C-12.0, O= 16.0]
- A. CH\(_3\)OH
- B. C\(_2\)H\(_5\)OH
- C. C\(_3\)H\(_7\)OH
- D. C\(_4\)H\(_9\)OH
Which of the following compounds has the lowest boiling point?
- A. C\(_4\)H\(_10\)
- B. CH\(_3\)COOH
- C. H\(_2\)O
- D. C\(_2\)H\(_5\)OH
The type of isomerism exhibited by cis and trans isomers is?
- A. positional
- B. geometrical
- C. functional
- D. optical
The following molecules have double covalent bonds between two atoms except?
- A. oxygen
- B. carbon (IV)oxide
- C. ethene
- D. water
Which of the following solids would not decompose on heating?
- A. Ammonium chloride
- B. Lead (i) trioxonitrate (V)
- C. Potassium trioxocarbonate (IV)
- D. Sodium hydrogen trioxocarbonate (IV)
The boiling point of pentane is higher than that of propane because?
- A. carbon-carbon single bonds are stronger than carbon-hydrogen bonds.
- B. Pentane has more covalent bonds to break
- C. Pentane does not burn easily as propane
- D. The intermolecular forces in pentane are stronger than those of propane
A factor that is considered most important when siting a chemical industry is?
- A. nearness to other industrial establishments
- B. nearness to raw materials
- C. favourable climate conditions
- D. availability of storage facilities
Which of the following pairs of elements has the greatest difference in electronegativity?
- A. Na and F
- B. Na and CI
- C. Na and Br
- D. Na and I
A balanced chemical equation is based on the law of?
- A. Periodicity
- B. Constant composition
- C. Multiple proportion
- D. Conservation of mass