Chemistry Past Questions And Answers
At 2.0 atm pressure, the volume of a gas is 4.0 L. If the pressure is reduced to 1.0 atm while keeping the temperature constant, what will be the new volume of the gas?
- A. 2.0 L
- B. 6.0 L
- C. 8.0 L
- D. 4.0 L
The inherited traits of an organism are controlled by?
- A. RNA molecules
- B. Nucleotides
- C. DNA molecules
- D. Enzymes
Which of the following molecules has a triple bond in its structure?
- A. CH4
- B. NH3
- C. N2
- D. O2
Which of the following compounds 'will undergo additional reaction?
- A) Ethyne
- B) Butane
- C) Pentane
- D) Ethanol
An isomer of C5H12 is
- A) 2–ethyl butane
- B) butane
- C) 2–methyl butane
- D) 2–methyl propane
The common feature of reactions at the anode is that
- A. electrons are consumed
- B. ions are reduced C. oxidation is involved D. the electrode dissolves B. ions are reduced
- C. oxidation is involved
- D. the electrode dissolves
Which of the following substances increases in mass when heated in air?
- A. Sodium chloride
- B. lodine crystals
- C. Magnesium ribbon
- D. Copper (ll) oxide
In a mixture of gases which do not react chemically together, the pressure exerted by the individual gases is called
- A. atmospheric pressure
- B. partial pressure
- C. total pressure
- D. vapour pressure
If sulphur (IV) oxide and methane are released simultaneously at the opposite ends of a narrow tube, the rates of diffusion Rso2 and Rch4 will be in the ratio? (S = 32, O = 16, C = 12, H = 1)
- A. 4:1
- B. 2:1
- C. 1:2
- D. 1:4
Which of the following is a non-metal that remains liquid at room temperature?
- A. Chlorine
- B. Phosphorus
- C. Bromine
- D. Helium