The alkyl group is represented by the general formula
- A. CnH2n
- B. CnH2n β 2
- C. CnH2n + 1
- D. CnH2n + 2
The enzyme used in the hydrolysis of starch to dextrin and maltose is?
- A. lipase
- B. amylase
- C. invertase
- D. zymase
The reaction of halogens with alkanes in the presence of sunlight is an example of
- A. oxidation reaction
- B. addition reaction
- C. hydrogenation reaction
- D. substitution reaction
Calculate the amount in moles of silver deposited when 9650C of electricty is passed through a solution of silver salt [= 96500 Cmol-1]
- A. 0.05
- B. 10.80
- C. 10.00
- D. 0.10
Tin is unaffected by air at ordinary temperature due to its?
- A. Low melting point
- B. Weak electropositive character
- C. High boiling point
- D. White lustrous appearance
The mass of silver deposited when a current of 10A is passed through a solution of silver salt for 4830s is β (Ag = 108 F = 96500(mol-1)
- A. 54.0g
- B. 27.0g
- C. 13.5g
- D. 108.0g
The shape of ammonia molecules is
- A. trigonal planar
- B. octahedral
- C. square planar
- D. tetrahedral
\(^{226}_{88}Ra\) β \(^x_{86}Rn\) + alpha particle
- A. 226
- B. 220
- C. 227
- D. 222
When ΞH is negative, a reaction is said to be
- A. endothermic
- B. exothermic
- C. reversible
- D. ionic
The ideal gas laws and equations are true for all gases at
- A. low pressures and lower temperatures
- B. low temperatures and high pressures
- C. high pressures and high temperatures
- D. low pressure and high temperatures
The salt formed from a weak acid and a strong base hydrolyzes in water to form
- A. A saturated solution
- B. an acidic solution
- C. a buffer solution
- D. an alkaline solution
Incomplete oxidation of ethanol yields
- A. CH3COOH
- B. CH3COCH3
- C. CH3CH2OCH2CH3
- D. CH3CHO
A sample of orange juice is found to have a PH of 3.80. What is the concentration of the hydroxide ion in the juice?
- A. 1.6 \(\times\) 10-4
- B. 6.3 \(\times\) 10-11
- C. 6.3 \(\times\) 10-4
- D. 1.6 \(\times\) 10-11
When few drops of concentrated trioxonitrate(V) acid is added to an unknown sample and wanned an intense yellow colouration is observed. The likely functional group present in the sample is
- A. NH2RCHCOOH
- B. CHO
- C. CO
- D. CNH2
An isomer of C5H12 is
- A. 2βethyl butane
- B. butane
- C. 2βmethyl butane
- D. 2βmethyl propane
A given mass of gas occupies 2dm3 at 300k. At what temperature will its volume be doubled, keeping the pressure constant?
- A. 400k
- B. 480k
- C. 550k
- D. 600k
For a general equation of the nature xP + yQ β mR + nS, the expression for the equilibrium constant is
- A. k [P]x [Q]y
- B. \(\frac{[P]^x [Q]^y}{[R]^m [S]^n}\)
- C. \(\frac{[R]^m [S]^n}{[P]^x [Q]^y}\)
- D. \(\frac{m[R] n[S]}{x[P] y[Q] }\)
The constituent of air necessary in the rusting process are
- A. O2 and H2O
- B. Ar and CO2
- C. CO2 and H2O
- D. O2 and CO2
In the laboratory preparation of ethyl ethanoate, the water present in the mixture is removed using ?
- A. Anhydrous CaCl2
- B. concentrated NaCO4
- C. dilute NaOH
- D. concentrated H2SO4
The process that occurs when two equivalent forms of a compound are in equilibrium is
- A. Isotopy
- B. Resonance
- C. Isomerism
- D. Reforming