Which of the following is NOT correct test for the named organic compound in each case?
- A. Butanoic acid solution gives effervescence with Na2CO3 solution
- B. Glucose when reacted with Na2CrO4 at 0°C will show immediate discharge of colour
- C. When but-2-ene is reacted with dilute solution of KMnO4 the purple colour of KMnO is discharged readily even room temperature
- D. When butan-2-ol is boiled with butanoic acid with a drop of concentrated H2SO4 a sweet smelling liquid is produced
How will a metal X, which reacts explosively with air and with dilute acids be best extracted from its ores?
- A. Electrolysis of solution of its salts
- B. Decomposition of its oxides
- C. Displacement from solution by an alkali metal
- D. Electroiysis of fused salt
Which of the following compounds would give lilac flame coloration and a white precipitate with acidified barium chloride solution?
- A. KCI
- B. NaNO3
- C. K2SO4
- D. CaSO4
A white solid suspected to be lead trioxonitrate (V) zinc trioxocarbonate (IV) or calcium trioxocabonate (IV) was heated strongly. Its residue which was yellow when hot and white when cold is?
- A. lead (II) oxide
- B. calcium oxide
- C. zinc oxide
- D. lead nitrate
Which of the following does NOT contain aluminium as component?
- A. Over-head cables
- B. Duralumin
- C. Container for caustic soda
- D. Container for nitric acid
The iron (III) oxide impurity in bauxite can be removed by?
- A. Fractional crystallization in acid solution
- B. dissolution in sodium hydroxide and filtration
- C. extraction with concentrated ammonia and reprecipitation
- D. electroysis of molten mixture
What are the values of x, y and z respectively in the equation: xCu + yHNO3 → xCu(NO3)2 + 4H2O + zNO?
- A. 4: 1: 2
- B. 3:8:2
- C. 2:8:3
- D. 8:3:2
Ammonia gas is normally dried with?
- A. concentrated sulphuric acid
- B. quicklime
- C. anhydrous calcium chloride
- D. magnesium sulphate
A substance Z reacts with NaOH to give salt and water only. When Z is treated with dilute HCl, a gas is evolved which gives a yellow suspension on passing into concentrated H2SO4. Substance Z is?
- A. NaHS
- B. Na2SO3
- C. Na2S
- D. NaHSO3
When chlorine is passed into water and subsequently exposed to sunlight, the gas evolved is?
- A. HCl
- B. HOCl
- C. O2
- D. Cl2O
Which of the following sulphides is insoluble in dilute HCl?
- A. Na2S
- B. ZnS
- C. CuS
- D. FeS
Which of the following metals does NOT form a stable trioxocarbonate (IV)?
- A. Fe
- B. Al
- C. Zn
- D. Pb
- E. none of the options is correct
In the course of an experiment, two gases X and Y were produced. X turned wet lead ethanoate to black and Y bleached moist litmus paper. What are the element(s) in each of the gases X and Y respectively?
- A. H and S;Cl
- B. H and O;Cl
- C. H and S;C and O
- D. H and Cl;S and O
Which of the following will react further with oxygen to form higher oxide?
- A. NO and H2O
- B. CO and CO2
- C. SO2 and NO
- D. CO2 and H2O
Oxygen-demanding waste are considered to be a water pollutant because they?
- A. deplete oxygen which is necessary for the survival of aquatic organism
- B. increase oxygen which is necessary for survival of aquatic organism
- C. increase other gaseous substances which are necessary for the survival of aquatic organisms
- D. deplete other gaseous species which is necessary for the survival of aquatic organisms
The exhaust fumes from a garage in a place that uses petrol of high sulphur content are bound to contain?
- A. CO and SO3
- B. CO and SO2
- C. CO,SO2 and SO3
- D. CO and H2S
When steam is passed through red hot carbon, which of the following are produced?
- A. Hydrogen oxygen and carbon (IV) oxide
- B. Hydrogen and carbon (IV) oxide
- C. Hydrogen and carbon (II) oxide
- D. Hydrogen and trioxocarbonate (IV) acid
The reaction Mg + H2O → MgO + H2 takes place only in the presence of?
- A. excess Mg ribbon
- B. excess cold water
- C. very hot water
- D. steam
The approximate volume of air containing 10cm3 of oxygen is?
- A. 20 cm3
- B. 25 cm3
- C. 50 cm3
- D. 100 cm3
What is the consequences of increasing pressure on the equilibrium reaction ZnO(s) + H2(g) Zn(s) + H2O(I)?
- A. The equilibrium is driven to the left
- B. The equilibrium is driven to the right
- C. There is no effect
- D. More ZnO is produced
20 cm3 of 1.0 molar NH4OH solution when neutralized with 20.05cm3 of 0.1 molar HCl liberated -102 joules of heat. Calculate the heat of neutralization of NH4OH?
- A. -51.O KJ mol-
- B. +57.3 KJ mol-
- C. +57.O KJ mol-
- D. +51.0 KJ mol-