Fats and oils are?
- A. addition products of long chain fatty acids and alkali
- B. addition products of long-chain fattyy acids and glycerol
- C. condensation products of long-chain fatty acids and glycerol
- D. condensation products of formaldehyde and glycerol
- E. liquids at 20°C
When air is compressed?
- A. its density decreases
- B. it solidifies
- C. its temperature decreases
- D. its temperature increases
- E. its temperature remains unchanged
If an organic compound decolorizes bromine water then the compound is?
- A. saturated
- B. supersaturated
- C. unsaturated
- D. a solid
- E. protonated
When sodium nitrate dissolves in water, ∆H is positive. This means that?
- A. the reaction is catalysed
- B. the reaction is complete
- C. the reaction is exothermic
- D. the reaction is endthermic
- E. sodium nitrate is highly soluble in water
Na2CO3 + 2HCI → 2NaCI + H2O + CO2. Using the above equation, what volume of carbondioxide, measured at s.t.p is liberated when 53g of sodium carbonate is dissolved in hydrochloric acid?
(1 mole of gas occupies 22.4 dm3 at s.t.p)
(Na = 23, C = 12, O = 16)
- A. 44.8 dm3
- B. 11.2 dm3
- C. 100.1 dm3
- D. 3.0 dm3
- E. 22.4 dm3
100 cm3 of oxygen is made to react with 50 cm 3 of hydrogen, and the whole reaction mixture was then passed through anhydrous calcium chloride. What is the volume of gas left?
- A. 5 cm3
- B. 25 cm3
- C. 50 cm3
- D. 75 cm3
- E. 100 cm3
9.8g of solid potassium chlorate (KCIO3) were added to 40 cm3 of water and heated to dissolve all the solid. As he solution cooled, crystals of potassium chlorate started forming at 60°C. The solubility of potassium chlorate at 66°C is therefore?
- A. 24.5 mole per dm3
- B. 0.2 mole per dm3
- C. 10.0 mole per dm3
- D. 20.0 mole per dm3
- E. 2.0 mole per dm3
When air is passed through alkaline pyrogallol and then over quicklime, the only gases left are?
- A. nitrogen and carbondoxide
- B. the rare gases
- C. nitrogen and oxygen
- D. nitrogen and the rare gases
- E. nitrogen, carbonioxide and the rare gases
The nitrogen gas obtained by burning an excess of phosphorus in air has a density higher than the nitrogen from nitrogen compounds because the nitrogen from air is contaminated with?
- A. some unburnt phosporus
- B. P2O5 vapour
- C. some oxygen
- D. rare gases
- E. carbondioxide
If atom X with six electrons in its outermost shell combines with atom Y with one electron in its outermost shell to form an ionic compound, then?
- A. six atoms of X will combine with one of Y
- B. two atoms of X will combine with six of Y
- C. one atom of X will combine with two of Y
- D. two atoms of X will combine with one of Y
- E. one atom of X will combine with six of Y
When a little brine was added to a metal nitrate a white precipitate was formed which first turned violet and then black on exposure to ai. The metal nitrate is therefore?
- A. sodium nitrate
- B. mercuric nitrate
- C. lithium nitrate
- D. silver nitrate
- E. potassium nitrate
If the temperature of a gas is increased?
- A. the kinetic energy of the emolecules will decrease
- B. the pressure will decrease if the volume is constant
- C. the gas will occupy a greater volume if the pressure is constant
- D. the mass of the gas will decrease
- E. the pressure and volume will increase
If the rate of diffusion of oxygen gas is taken as 1, what will be rated of diffusion of methane whose relative molar mass is 16?
- A. 2.0
- B. 1.8
- C. 1.4
- D. 1.0
- E. 0.5
Which of the following equations represents an oxidizing action of sulphur dioxide?
- A. SO2 + 2HNO2 → H2SO4 + 2NO2 + heat
- B. 2SO2 + 2H2O + O2 → 2H2SO4
- C. SO2 + 2H2O + CI2 → H2SO4 + 2HCI
- D. SO2 + 2H2S → 3S + 2H2O
- E. K2Cr2O7 + H2SO4 + 3SO2 → K2SO4 + Cr2(SO4)3 + H2O
Which of the following represents ethyl ethanonate?
- A. CH3CH2CO2CH3
- B. (CH3CO2)2O
- C. CH3CH2CO2CH2CH3
- D. CH3CO2CH2CH3
- E. CH3CH2COCH2CH3
The production of ammonia by the haber process may be represented by the equilibrium equation N2(g) + 3H2(g) ↔ 2NH3 ∆H = -22KJ. Therefore the production of ammonia will be favoured by?
- A. only high pressure
- B. only high temperature
- C. a combination of high temperature and low pressure
- D. a combination of low temperature and high pressure
- E. low pressure
When a solution of silver (l) nitrate is saturated with hydrogen sulphide, a black precipitate forms which is?
- A. H2S
- B. Ag2S
- C. PbS
- D. HNO3
- E. S
1.00 g of the oxide of metal X (atomic mass = 64) gave 0.80 g of the metal when reduced with hydrogen.
The formula of the oxide is?
- A. X2O
- B. XO
- C. XO2
- D. X2O3
- E. X3O4
In the chemical reaction A + B \(\to\) C + D, more of D is formed?
- A. if the concentrated of A is reduced
- B. if the concentrated of B is reduced
- C. if the concentrated of C is reduced
- D. if the concentration of C is increased
- E. if D is continuously removed from the reaction mixture
In the reaction N2(g) + O(g)
↔ 2NO(g) produced i an increase in the total pressure will?
- A. cause less nitrogen to be produced in the equilibrium mixture
- B. cause less nitric oxide to be produced in the equilibrium mixture
- C. cause more nitric oxide to be produced in the equilibrium mixture
- D. cause more oxygen to be produced in the equilibrium mixture
- E. have no effect
Which of the following CANNOT be obtained by fractional distillation of petroleum?
- A. Ether
- B. Methane
- C. Butane
- D. Ethene
- E. Hydrogen