What is the value of -14oC on the Kelvin temperature scale?
- A. 259K
- B. 287 K
- C. 287oK
- D. 259oK
What is the percentage by weight of calcium in Ca(OCI)2? [Ca = 40, Cl = 35.5, O = 16]
- A. 28.0%
- B. 31.6%
- C. 43.8%
- D. 44.5%
Consider the reaction represented by the equation: 2NaHCO3 → Na2CO 3 + H 2O + CO 2. What is the mass of sodium trioxocarbonate (lV) produced by the complete decomposition of 33.6 g of sodium hydrogen trioxocarbonate (IV)? [NaHCO3 = 84, Na2CO3 = 106]
- A. 10.6 g
- B. 16.8 g
- C. 21.2 g
- D. 42.4 g
How many molecules are there in 14 g of nitrogen at s.t.p.? [N = 14, Avogadro’s constant = 6.02 x 1023 mol-1]
- A. 6.02 x 1023
- B. 3.01 x 1023
- C. 8.43 x 1024
- D. 1.20 x 1024
The number of particles in one mole of a chemical compound is the
- A. atomic number
- B. avogadro's number
- C. mass number
- D. oxidation number
Which of the following molecules is not linear in shape?
- A. CO2
- B. O 2
- C. NH3
- D. HCI
In bonded atoms, increase in electronegativity difference,
- A. increases polarity
- B. decreases polarity
- C. has no effect on polarity
- D. brings the polarity to zero
Which of the following arrangements is in order of increasing ionization energy?
- A. AI, Si, P, S
- B. Si, AI,S,P
- C. S,P,Si,AI
- D. P, Si,S,AI
Which of the following properties of covalent compounds is not correct? They
- A. are non-electrolytes
- B. are mostly gaseous and volatile liquids
- C. have low melting point
- D. have high boiling points
Which of the statements about the behaviour of the atom is correct?
- A. atomic size decreases down the group
- B. atomic size increases across the period
- C. anions are smaller than the parent atom
- D. cations are smaller than the parent atom
An element Q forms a compound QCI5. In which group of the periodic table is Q?
- A. l
- B. lll
- C. V
- D. VII
Which of the following electronic configurations correctly represents an element in period 3 of the periodic table?
- A. 1s2 2s2 2p2
- B. 1s2 2s2 2p6
- C. 1s2 2s2 2p6 3s2 3p4
- D. 1s2 2s2 2p6 3s2 3p6 4s1
Which of the following ions is isoelectronic with neon? [3Li, 3F, 10Ne, 17CI,19K]
- A. CI-
- B. F-
- C. K+
- D. Li,+
The following properties are characteristics of transition elements except
- A. formation of complex ions
- B. fixed oxidation states
- C. formation of coloured compounds
- D. catalytic abilities
Which of the following elements has the electronic configuration:1s22s22p63s23p1? [11Na, 13A1,
14N,16S]
- A. Al
- B. Na
- C. N
- D. S
How many orbitals are associated with the p-sub energy level?
- A. 2
- B. 3
- C. 5
- D. 6
Consider the reaction represented by the equation: 23892U + 10 → 139 56Ba + 94 36Kr + 31 0n. The reaction represents a
- A. nuclear fission
- B. nuclear fusion
- C. radioactive decay
- D. spontaneous disintegration
If 100 atoms of element X contains 70 atoms of 9X and 30 atoms of 11X, calculate the relative atomic mass of X
- A. 9.6
- B. 10.6
- C. 11.6
- D. 20.0
Which of the following scientists discovered the neutron?
- A. Ernest Rutherford
- B. J.J Thompson
- C. James Chadwick
- D. R. A. M illikan