Which of the following arrangement of elements is in decreasing order of electronegativity?
- A. Na, Mg, Al, Si, P
- B. Na, A1, Mg, P, Si
- C. P, Mg, Na, Si, Al
- D. P, Si, Al, Mg, Na
Which of the following metals does not react with water to produce hydrogen?
- A. Copper
- B. Potassium
- C. Sodium
- D. Zinc
“Electrons always occupy the lowest empty energy level” is a statement of
- A. Aufbau Principle
- B. Hund's rule
- C. Pauli Exclusion Principle
- D. Periodic law
. If 20 cm\(^3\) of sodium hydroxide was neutralized by 20 cm\(^3\) of 0.01 mol dm3 tetraoxosulphate(VI) acid, what is the concentration of the solution?
- A. 0.010
- B. 0.020
- C. 0.100
- D. 0.150
How many moles of H\(_2\)SO4 are there in 50 cm\(^3\) of 0.108 mol dm\(^3\) solution of the acid?
- A. 5.4x 10
- B. 5.4 x 10\(^{-3}\)
- C. 5.4 x 10\(^{-2}\)
- D. 5.4x 10\(^{-1}\)
Which of the following statements about the solubility of a salt is correct?
- A. A salt whose solubility increases with temperature would not crystallize easily on cooling
- B. A salt whose solubility is independent of temperature would normally crystallize out on cooling
- C. Crystallization would be efficient in separating out a salt whose solubility increases considerably with temperature
- D. Solubility of a solid does not affect its crystallization
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 30°C was evaporated to dryness, 5.0 g of the salt was obtained..
What is the solubility of the salt at 30°C? [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\(_2\) \(_g\) → 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. ΔH 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