Arrange the following elements in order of increasing electron affinity: Br2CI2
I 2
F 2
- A. I 2CI2Br2F 2
- B. I 2Br2CI2F 2
- C. CI2 I 2Br2F 2
- D. Br2CI2 I 2 F 2
Consider the following elements and their electronic configurations
W: 1s22s2
X: 1s 22s22p6
Y: 1s22s22p63s2
Z: 1s22s22p63s23p2. Which of the elements belong to the same group in the periodic table?
- A. W and X only
- B. Y and Z only
- C. W and Y only
- D. W, Y and Z only
Elements in the same group of the periodic table have
- A. the same number of valence electrons
- B. the same number of electron shells
- C. different chemical behaviour
- D. the same atomic size
Which of the following statements is not true of halogens?
- A. they exist in different physical states
- B. they exist as diatomic molecules
- C. their ionic radii decrease down the group
- D. their melting and bolling points increase down the group
Atom \(^{234} _{88} Q\) decay by alpha emission to give an atom R. The atomic number and mass number of atom R are respectively
- A. 86 and 230
- B. 87 and 234
- C. 88 and 233
- D. 90 and 238
What is the atomic number of an element whose cation Y+ has the electronic configuration 1s22s22p6?
- A. 9
- B. 10
- C. 11
- D. 12
The valence electrons in a chloride ion are [17CI]
- A. 2p electrons only
- B. 3s and 3p electrons only
- C. 3p and 3d electrons only
- D. 3p electrons only
Find the number of neutrons in an atom represented by 4521X.
- A. 21
- B. 24
- C. 45
- D. 66
The mass spectrometer can be used to measure mass of
- A. an atom
- B. an electron
- C. a proton
- D. a neutron
Which of the these metals will not liberate hydrogen from dilute HCI?
- A. Copper
- B. Iron
- C. Magnesium
- D. Zinc
What volume will 0.5 g of H2 occupy at s.t.p? [H = 1; 1 mole of a gas occupy 22.4 dm3 at s.t.p.]
- A. 2.24 dm3
- B. 5.60dm3
- C. 11.20dm3
- D. 44.80dm3
Pig-iron is brittle because it contains
- A. a high percentage of carbon as impurity
- B. calcium trioxosilicate (IV)
- C. unreacted haematite
- D. undecomposed limestone
The following substances are heavy chemicals except
- A. sodium trioxocarbonate (IV)
- B. tetraoxosulphate (VI) acid
- C. lead (lV) tetraethyl
- D. sodium hydroxide
Which of the following methods can be used to separate a mixture of two miscible liquids with different boiling points?
- A. Decantation
- B. Distillation
- C. Evaporation
- D. Filtration
from the following ores is iron extracted? I. Haematite ll. Bauxite III. Magnetite IV. Cassiterite
- A. l and ll only
- B. l and lll only
- C. l, ll and lll only
- D. l, ll, lll and lV
Glucose reduces Fehling’s solution on warming to
- A. copper (l) oxide
- B. copper (ll) oxide
- C. copper (l) chloride
- D. copper (ll) hydroxide
Which of the following compounds reacts readily with sodium to liberate hydrogen?
- A. CH3CH2CH3
- B. CH3COOH
- C. CH3 CH2CHO
- D. CH3 CH(OH)CH3
Consider the reaction below: Vegetable oil \(\frac{H2;NI catalyst}{High temperature}\) product. The reaction is applied in the manufacture of?
- A. drugs
- B. margarine
- C. paraffin wax
- D. soapy detergents
Hydrocarbons which react with ammoniacal copper (l) chloride solution conform to the general molecular formula
- A. CnH2n
- B. CnH2n
- C. CnH2n+2
- D. CnH2n-2
Alkenes undergo the following reactions except
- A. addition
- B. hydration
- C. polymerization
- D. substitution
Which of the following pairs of substances can be distinguished by use of NaHCO3 solution?
- A. CH 3CH2OH and HCOOCH3
- B. CH 3CH2OH and CH3COOH
- C. CH3COOH and HCOOH
- D. CH 3CH2OH and CH3OH