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Chemistry Past Questions
The general formula for the alkanals is
- A. ROH
- B. R2CO
- C. RCOOR1
- D. RCHO
The structural component that makes detergent dissolve more quickly in water than soap is
- A. –SO3 –Na+
- B. –COO-Na+
- C. –SO4- Na+
- D. –COO-K+
Carbohydrates are compounds containing carbon, hydrogen and oxygen in the ratio
- A. 3:01:01
- B. 2:01:01
- C. 1:02:01
- D. 1:01:01
In which of the following reactuions does reduction take place
- A. Fe2+ - e- Fe3+
- B. 2O2- → O2 + 4e-
- C. Cr - 2e- → Cr2+
- D. 2H+ + 2e- →H2
Zinc and carbon rods are used as anode and cathode respectively in a
- A. Voltaic cell
- B. Lead accumulator
- C. Leclanche cell
- D. Daniel cell
sulphur (IV) oxide bleaches by
- A. Reduction
- B. Oxidation
- C. Hydration
- D. Absorption
3Cu + pHNO3 → 3Cu(NO3)2 + 4H2O + xNO In the equation above, the values of p and x respectively are
- A. 1 and 3
- B. 2 and 3
- C. 6 and 2
- D. 8 and 2
An isomer of C5H12 is
- A. Butane
- B. 2-methylbutane
- C. 2-methylprpane
- D. 2-ethylbutane
Ethanoic acid is
- A. Tribasic
- B. Unionizeable
- C. Monobasic
- D. Dibasic
Na2CO3(aq) + 2HCI(aq) → 2NaCI(aq) + H2O(l) + CO2(g) How many moles of sodium trioxocarbonate (IV) are there in a 25cm3 solution which required 10cm3 of 0.05 mol dm-3 hydrochloric acid solution to neutralize it?
- A. 0.100mloe
- B. 0.001mole
- C. 1.000mole
- D. 0.010mole