What is the percentage composition of carbon
in Ca(HCO3)\(_{2}\) ?
[ Ca = 40.0, 0= 16.0, C = 12.0, H= 1.0]
- A. 22.2%
- B. 14.8%
- C. 7.4%
- D. 3.7%
Which of the following elements would displace copper from a solution of copper ions?
- A. silver
- B. gold
- C. lead
- D. mercury
If 50 cm\(^{3}\) of a saturated solution of KNO\(_{3}\) at 40 °C contained 5.05 g of the salt, its solubility at the same temperature would be
[KNO\(_{3}\) = 101]
- A. 1.0 mol dm\(^{-3}\)
- B. 1.5 mol dm\(^{-3}\)
- C. 2.0 mol dm\(^{-3}\)
- D. 5.0 mol dm\(^{-3}\)
What number of moles of oxygen would exert a pressure of 10 atm at 320 K in an 8.2 dm\(^{3}\) cylinder?
[R=0.082 atm dm\(^{-3}\) mol\(^{-1}\) K\(^{-1}\)]
- A. 0.32
- B. 1.52
- C. 3.13
- D. 31.25
A hydrogen chloride gas reacted with oxygen gas to yield water and chlorine gas. The mole ratio of the hydrogen chloride gas to water is
- A. 1:3
- B. 2:1
- C. 3:1
- D. 4:1
Which of the following statements about liquids is/are true?
I. Liquids maintain their volume at constant temperature.
II. Liquids have fixed shape
III. Liquids do not diffuse
IV. Change in pressure affects volume of liquids
- A. I only
- B. IV only
- C. I and IV only
- D. II and III only
When air in a syringe is compressed such that there is no change in temperature, the
- A. air liquefies
- B. pressure increases
- C. intermolecular space increases
- D. density decreases
Consider the following reaction equation
N\(_{2}\)(g) + 3H\(_{2(g)}\) ⇌ 2NH3(g) ∆H = -92kJ
Increasing the temperature of the reaction would
- A. shift the equilibrium to the right
- B. increase the yield of ammonia
- C. decrease the amount of hydrogen
- D. decrease the yield of ammonia
Which of the following statements about an equilibrium system is correct?
- A. Forward and backward reactions occur at the same rate
- B. The concentrations of reactants must equal that of the products
- C. The concentrations of, reactants and products can be changed by adding a catalyst,
- D. The concentrations of reactants and products are not affected by a change in temperature
Which of the following gases is alkaline?
- A. NO\(_{2}\)
- B. CO\(_{2}\)
- C. NH\(_{3}\)
- D. N\(_{2}\)O
Graphite is used as a dry lubricant due to the presence of
- A. mobile electrons
- B. free electrons
- C. octahedral structures
- D. layered structures
What is the partial pressure of oxygen at s.t.p. in a gaseous mixture containing 100 cm3 of oxygen and 900 cm3 of nitrogen gas?
- A. 1.0 atm
- B. 0.1 atm
- C. 9.0 atm
- D. 0.9 atm
Which of the following acids would form normal salt only?
- A. Tetraoxosulphate(VI) acid
- B. Trioxonitrate(V) acid
- C. Tetraoxophosphate(V) acid
- D. Trioxosulphate(IV) acid
Consider the following reaction equation:
CaO + SiO\(_{2}\) ——> CaSiO\(_{3}\)
Silicon(IV) oxide is acting as
- A. a basic oxide
- B. a reducing agent
- C. an acidic oxide
- D. an oxidizing agent
Before a reaction could take place, there should be
- A. ionization of reactant particles
- B. breakage of bonds of products
- C. breakage of bonds of reactants
- D. ionization of product particles
A white precipitate was formed when BaCl\(_{2(aq)}\) was added to an aqueous solution
of a salt X. The precipitate dissolved in dilute HCl with rapid effervescence. Salt X is likely to contain
- A. SO\(_{4}\) \(^{2-}\) ions
- B. SO\(_{3}\) \(^{2-}\) ions
- C. NO\(_{3}\)- ions
- D. SO\(_{3}\) \(^{2-}\)- ions
Increasing the temperature generally
- A. decreases the solubility of a solid in a liquid but increases the solubility of a gas in a liquid.
- B. increases the solubility of a solid in a liquid but decreases the solubility of a gas in a liquid.
- C. increases the solubility of both a solid and a gas in a liquid
- D. decreases the solubility of both a solid and a gas in a liquid
If 5.0 g of marble reacts with 25.0 cm3 hydrochloric acid, which of the following combinations has the fastest reaction rate?
- A. Marble chips and 2.0 mol dm\(^{-3}\) HCl\(_{(aq)}\)
- B. Marble chips and 2.5 mol dm\(^{-3}\) HCl\(_{(aq)}\)
- C. Powdered marble and 2.5 mol dm\(^{-3}\) HCl\(_{(aq)}\)
- D. Powdered marble and 2.0 mol dm\(^{-3}\) HCl\(_{(aq)}\)
A colourless gas with a pungent smell is evolved when dilute hydrochloric acid is added to a sample of a salt. The gas evolved could turn
- A. acidified K\(_{2}\)Cr\(_{2}\)O\(_{7}\) solution colourless
- B. acidified KMnO\(_{4}\) solution colourless
- C. Fe(NO\(_{3}\))\(_{2}\) solution green
- D. Pb(NO\(_{3}\))\(_{2}\) paper black
The IUPAC name for CH\(_{3}\)CHCH\(_{3}\)CHCLCHCH\(_{3}\)CH\(_{2}\)CH\(_{3}\) is
- A. 2, 4 - dimethyl - 3 - chlorohexane
- B. 3, 5 - dimethyl - 4 - chlorohexane
- C. 4 - chloro - 3, 5 - dirnethylhexane
- D. 3 - chloro - 2, 4 - dimethylhexane
Oxochlorate(I) acid is used as a bleaching agent because it is
- A. a weak acid
- B. a reducing agent.
- C. an oxidizing agent
- D. a strong acid.