The type of chemical bond that exists between potassium and oxygen in potassium oxide is
- A. ionic
- B. metallic
- C. covalent
- D. dative
Electrovalent compounds are characterized by
- A. solubility in ethanol
- B. high molar mass
- C. high melting point
- D. strong oxidizing ability
An element Z has a combining power of 3. Which of the following formulae is correct of its compounds?
- A. ZSO3
- B. Z3CI2
- C. Z 2O 3
- D. ZS3
Chlorine atom forms \(Cl^{-}\) by
- A. losing one electron
- B. Sharing one electron
- C. Donating lone pair of electrons
- D. Gaining one electron
The atoms of four elements are represented as 20Q, 16R, 10S and 8T Which of the elements would be unreactive?
- A. Q
- B. R
- C. S
- D. T
The greenhouse effect is a climatic condition associated with the presence of excess
- A. carbon (IV) oxide
- B. hydrogen sulphide
- C. nitrogen (ll) oxide
- D. ammonia gas
Environmental pollution problems are generally more severe in countries which have
- A. dense population
- B. low birth rate
- C. great land mass
- D. limited industries
Which of the following is needed to produce slag during the extraction of iron in the blast furnace?
- A. Cryolite
- B. Limestone
- C. Carbon
- D. Sulphur
Geometric (cis-trans) isomerism is exhibited by
- A. C 2H 2CI 2
- B. CH2CI5
- C. C 4H 10
- D. C5H12
Which of the following is a secondary alkanol?
- A. OHCI2-CH2OH
- B. H2C=CH-CH2OH
- C. CH 3-CH(OH)-CH 3
- D. CH3-(CH2)3-CH2OH
Alkanoates are produced from alkanols by
- A. fermentation
- B. saponification
- C. oxidation
- D. esterification
Which of the following compounds reacts with sodium hydroxide to form a salt?
- A. CH 3CH 2COOH
- B. (CH3) 3COH
- C. CH3CH=CH 2
- D. C 6H 12O 6
Which of the following compounds is unsaturated?
- A. 2-methylbutane
- B. Chloromethane
- C. Methylbenzene
- D. 1,2-dibromoethane
Which of the following is the most reactive towards bromine?
- A. Methane
- B. Benzene
- C. Ethyne
- D. Hexane
How many carbon atoms are present in one molecule of 2-methylpropane?
- A. 2
- B. 3
- C. 4
- D. 5
When dilute copper (ll) chloride solution is electrolysed, the reaction at the cathode is represented by the equation
- A. Cu → Cu2+ + 2e-
- B. Cu2+ + 2e- → Cu
- C. 40H- - 4e- → O2 + 2H2O
- D. 2CI- → CI2 + 2e
Equal volumes of water were added to one mole of each of the following compounds. Which of them produced the largest number of ions
- A. Glucose
- B. Sodium trioxonitrate (V)
- C. Ethananoic acid
- D. Silver chloride
Which of the following is not correct about oxidation number convention? The oxidation number of a/an
- A. element in the free state is zero
- B. monatomic ion is equal to its charge
- C. alkali meta like sodium in its compounds is + 1
- D. atom of a diatomic molecules is + 2
What will be the effect of increase in pressure on the following system at equilibrium? 2NH2(g) N2(g) + 3H2(g)
- A. Activation energy will decrease
- B. the forward reaction will be favoured
- C. the concentration of ammonia will increase
- D. the reaction will go to completion
Consider the reaction represented by the following equation: H2(g) + 12(g) → 2HI(g). The number of effective collisions of molecules of the reactants decreases as
- A. the temperature is raised
- B. the pressure increased
- C. the volume of the system is increased
- D. a catalysty is intoduced into the system
Which of the following lowers the activation energy of a chemical reaction?
- A. Freezing mixture
- B. Reducing agent
- C. Water
- D. Catalyst