An unknown organic compound X has a relative molecular mass of 180. It is a colourless crystaline solid, readily soluble in water. X contains the elements C, H and O in the atomic ratio 1: 2:1. The compound has a sweet teste and melts on heating. In the presence of yeast and in the absence of air, X is converted to compound Y and a colourless gas. Compound Y reacts with sodium metal to produce a gas Z which gives a ‘pop’ sound with a glowing splint. Y also reacts with ethanoic acid to give a sweet smelling compound W.
Compound W is
- A. a soap
- B. an oil
- C. an alkane
- D. an ester
- E. sucrose
The three-dimensional shape of methane is
- A. hexagonal
- B. trigonal
- C. linear
- D. tetrahedral
- E. cubical
Some copper (ll) sulphate pentahydrate (CuSO4 5H2O), was heated at 120 oC with the following results. Wt of crucible = 10.00 g; Wt of crucible + CuSO4 5H2O =14.98g; Wt of crucible + residue = 13.54 g. How many molecules of water of crystalization were lost?
[H = 1, Cu = 63.5, O = 16, S = 32]
- A. 1
- B. 2
- C. 3
- D. 4
- E. 5
If an element has the electronic configuration 1s 2 2s2 2p3 3s2 3p4, it is
- A. a metal
- B. an alkaline earth metal
- C. an s-block element
- D. a p-Block element
- E. a transition element
Consecutive members of an alkane homologous serires differ by
- A. CH
- B. CH2
- C. CH3
- D. CnHn
- E. CnH
The flame used by welders in cutting metals is
- A. butane gas flame
- B. acetylene flame
- C. kerosene flame
- D. oxy-acetylene flame
- E. oxygen flame
The alkanol obtained from the production of soap is
- A. ethanol
- B. glycerol
- C. methanol
- D. propanol
- E. glycol
X is a crystalline salt of sodium solution of X in water turns litmus red and produces a gas which turns lime water milky when added to sodium carbonate. With barium chloride solution, X gives hydrochloric acid. X is
- A. Na 2CO 3
- B. NaHCO 3
- C. NaHSO 4
- D. Na 2SO 4