An element used in the production of matches is
- A. nitrogen
- B. aluminium
- C. copper
- D. sulphur
According to the Kinetic Theory an increase in temperature causes the kinetic energy of particles to
- A. decrease
- B. increase
- C. be zero
- D. remain constant
To what temperature must a gas at 273k be heated in order to double both its volume and pressure?
- A. 298K
- B. 546K
- C. 819K
- D. 1092K
Which of the following is an example of a chemical change?
- A. dissolution of salt in water
- B. rusting of iron
- C. melting of ice
- D. separating a mixture by distillation
The type of bonding in [Cu(NH\(_3\))\(^4\)]\(^{2+}\) is
- A. coordinate
- B. electrovalent
- C. metallic
- D. covalent
What is the PH of 0.00 1 moldm\(^3\) solution of the sodium hydroxide
- A. 14
- B. 13
- C. 12
- D. 11
The Sulphide which is insoluble in dilute hydrochloric acid is
- A. FeS
- B. CuS
- C. ZnS
- D. Na2S
A substance that is used as a ripening agent for fruits is
- A. ethene
- B. propane
- C. methane
- D. butane
According to Charles’ law, the volume of a gas becomes zero at
- A. 0°C
- B. -100°C
- C. -273°C
- D. -373°C
A given amount of gas occupies 10.0dm\(^3\) at 4atm and 273°C. The number of moles of the gas present is?
[Molar volume of gas at s.t.p = 22.4dm\(^3\)]
- A. 0.89 mol
- B. 1.90 mol
- C. 3.80 mol
- D. 5.70 mol
X(g) + 3Y(g) —- 2z(g) H = +ve. if the reaction above takes place at room temperature, the G will be
- A. negative
- B. zero
- C. positive
- D. indeterminate
Ca(OH)2(s) + 2NH4Cl(s) → CaCl2(s) + 2H2O(l) + X. In the reaction above X is
- A. NO2
- B. NH3
- C. N2O
- D. NO2
Water for town supply is chlorinate to make it free from
- A. bad colour
- B. bacteria
- C. temporary hardness
- D. permanent hardness
The furring of kettles is caused by the presence in water of
- A. calcium hydrogentrioxocarbonate (IV)
- B. calcium trioxocarbonate (IV)
- C. calcium tetraoxosulphate (VI)
- D. calcium hydroxide
Due to the high reactivity of sodium, it is usually stored under
- A. water
- B. mercury
- C. paraffin
- D. phenol
If 100cm3 of oxygen pass through a porous plug is 50 seconds, the time taken for the same volume of hydrogen to pass through the same porous plug is? [O = 16, H = 1]
- A. 10.0s
- B. 12.5s
- C. 17.7s
- D. 32.0s
Calculate the amount in moles of a gas which occupies 10.5 dm3 at 6 atm and 30oC [R = 0.082 atm dm3 K-1 mol-1]
- A. 2.536
- B. 1.623
- C. 4.736
- D. 0.394
Ethene is prepared industrially by
- A. Reforming
- B. Polymerization
- C. Distillation
- D. Cracking
A particle that contains 9 protons, 10 neutrons and 10 electrons is
- A. positive ion
- B. neutral atom of a metal
- C. neutral atom of a non-metal
- D. negative ion
In the laboratory preparation of trioxonitrate (V) acid the nitrogen(iv) oxide formed as a by-product is removed by
- A. further heating
- B. adding concentrated H2SO4
- C. cooling the acid solution with cold water
- D. bubbling air through the acid solution
The gas that can be collected by downward displacement of air is
- A. chlorine
- B. sulphur (IV) oxide
- C. carbon (IV) oxide
- D. ammonia