To obtain pure carbon(ii)oxide from its mixture with carbon(iv)oxide, the mixture should be?
- A. Passed over heated copper(ii)oxide
- B. Bubbled through water
- C. Bubbled through conc H\(_2\)SO\(_4\)
- D. Bubbled through conc NAOH
The most important element on the earth’s crust is?
- A. Nitrogen
- B. Hydrogen
- C. Oxygen
- D. Fluorine
Aluminum hydroxide is used in the dyeing industry as a?
- A. Dye
- B. Dispersant
- C. Salt
- D. Mordant
An electron can be added to a halogen atom to form a halide ion with?
- A. 8 valence electrons
- B. 7 valence electrons
- C. 2 valence electrons
- D. 3 valence electrons
When a solid substance disappears completely as a gas on heating, the substance is said to have undergone?
- A. Sublimation
- B. Crystallization
- C. Distillation
- D. Evaporation
When cathode rays are deflected onto the electrode of an electrometer, the instrument becomes?
- A. Bipolar
- B. Negatively charged
- C. Positively charged
- D. Neutral
The general formula for the Alkanals is?
- A. R\(_2\)CO
- B. RCHO
- C. ROH
- D. RCOOR
Proteins in acid solution undergo?
- A. Substitution
- B. Fermentation
- C. Hydrolysis
- D. Polymerisation
What mass of water is produced when 8.0g of hydrogen reacts with excess oxygen?
- A. 8.0g
- B. 16.0g
- C. 36.0g
- D. 72.0g
The chlorinated alkane often used industrially to remove grease is?
- A. Tetrachloromethane
- B. Chloromethane
- C. Trichloromethane
- D. Dichloromethane
The substance often used for vulcanization of rubber is?
- A. Chlorine
- B. Hydrogen peroxide
- C. Sulphur
- D. Tetraoxosulphate(vi) acid
An organic compound that does not undergo a reaction with both hydrogen cyanide and hydroxylamine can be?
- A. Alkene
- B. Alkanal
- C. Alkanone
- D. Alkanoic Acid
Which of the following types of bonding does not involve the formation of new substances?
- A. Metallic
- B. Covalent
- C. Co-ordinate
- D. Electrovalent
What quantity of electricity will liberate 0.125 mole of oxygen molecules during the electrolysis of dilute sodium chloride solution?
- A. 24,125 C
- B. 48,250 C
- C. 72,375 C
- D. 96,500 C
A gaseous metallic chloride MCl consists of 20.22% of M by mass. The formula of the chloride is?
[ M = 27, Cl = 35.5]
- A. MCl
- B. MCl\(_2\)
- C. MCl\(_3\)
- D. M\(_2\)Cl\(_6\)
32g of anhydrous copper(ii)tetraoxosulphate(vi) dissolved in 1dm\(^3\) of water generated 13.0kj of heat. The heat solution is?
- A. 26.0kj/mol
- B. 65.0kj/mol
- C. 130.0kj/mol
- D. 260.0kj/mol
Helium is used in observation of ballons because it is?
- A. Light and combustible
- B. light and non-combustible
- C. heavy and combustible
- D. heavy and non-combustible
Deliquescent substances are also?
- A. efflorescent
- B. anhydrous
- C. hygroscopic
- D. insoluble
Chromatography is used to separate components of mixture which differ in their rates of ?
- A. diffusion
- B. migration
- C. reaction
- D. sedimentation
A few drop of conc HCL are added to about 10cm\(^3\) of a solution of PH 3.4. The PH of the resulting mixture is?
- A. less than 3.4
- B. greater than 3.4
- C. unaltered
- D. the same as that of the pure water
The shape of ammonia molecule is?
- A. Trigonal planar
- B. Octahedral
- C. Square planar
- D. Tetrahedral