Which of the following in aqueous solution is neutral to litmus?
- A. NH4CI
- B. NaCO3
- C. FeCl3
- D. NaCl
Which of the following dilute solutions has the lowest pH value?
- A. Calcium trioxocarbonate (IV)
- B. Sodium trioxocarbonate (IV)
- C. Hydrochloric acid
- D. Ethanoic acid
A substance S is isomorphous with another substance R. When a tiny crystals of S is added into a supersaturated solution of R?
- A. S dissolves in the solution
- B. crystals of R are precipitated
- C. there is no observable change
- D. R and S react to generate heat
The ion that may be assumed to have negligible concentration in a sample of water that lathers readily with soap is?
- A. Mg+
- B. K+
- C. CO22-
- D. HCO3
Starch can be converted to ethyl alcohol by?
- A. distillation
- B. fermentation
- C. isomerization
- D. cracking
Which of the following are made by the process of polymerization?
- A. Nylon and soap
- B. Nylon and artificial rubber
- C. Soap and butane
- D. Margarine and nylon
The general formula of an alkyl halide (where X represents the halide) is?
- A. CnH2n 2X
- B. CnH2n + 1X
- C. CnH2n + 2X
- D. CnH2nX
Which of the following substance is a mixture?
- A. Granulated sugar
- B. Sea-water
- C. Sodium chloride
- D. Iron fillings
Which of the following compounds is NOT formed by the action of chlorine on methane?
- A. CH3CI
- B. C2H5CI
- C. CH2CI2
- D. CHCI3
When ethanol is heated with excess concentrated sulphuric acid, the ethanol is?
- A. oxidized to ethene
- B. polymerized to polyethene
- C. dehydrated to ethene
- D. dehydrated to ethyne
What reaction takes place when palm-oil is added to potash and foam are observed?
- A. Neutralization
- B. Saponification
- C. Esterification
- D. Salting-out
Which of the following is used as an ‘anti-knock’ in automobile engines?
- A. Tetramethyl silane
- B. Lead tetra-ethyl
- C. Glycerol
- D. n-heptane
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