Which of the following hydroxides will readily dissolved in water?
- A. Cu(OH)2
- B. NaOH
- C. Pb(OH)2
- D. Zn(OH)2
Which of the following compounds is not a double salt?
- A. Zn(OH)NO3
- B. KAI(SO4)2
- C. KCr(SO4)2
- D. (NH4)2Fe(SO4)2
Which of the following dilute acids does not react with metals to liberate hydrogen?
- A. CH3COOH(aq)
- B. HCI(aq)
- C. H2SO4(aq)
- D. HNO3(aq)
Salts that contain water of crystallization are said to be
- A. anhydrous
- B. deliquescent
- C. efflorescent
- D. hydrated
Consider the reaction represented by the following equation: H 2(g) + \(\frac{1}{2}\) O(g) → H 2O(g) ∆H =-285.8 KJmo -1 ∆H represents the enthalpy of
- A. formation
- B. hydration
- C. neutralization
- D. solution
In a chemical reaction, ∆H is positive when
- A. H (product) >H (reactant)
- B. H(product) < H (reactant)
- C. H (product) = H (reactant)
- D. H (product) = Zero (reactant)
In a mixture of gases which do not react chemically together, the pressure exerted by the individual gases is called
- A. atmospheric pressure
- B. partial pressure
- C. total pressure
- D. vapour pressure
Which of the following expressions correctly represents Charles’ law?
- A. PV = K
- B. R \(\alpha \frac{1}{\sqrt{p}\)
- C. PV = RT
- D. V = KT
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,+