The complete hydrogenation of C 6
H 6 in the presence of nicked catalyst at 200oC gives
- A. C6H8
- B. C 6H10
- C. C 6H 12
- D. C 6H 14
Which of the following substances is suitable solvent for perfumes?
- A. Benzene
- B. Ethanol
- C. Turpentine
- D. Water
What product is formed at the cathode during the electrolysis of concentrated sodium chloride solution using carbon electrodes?
- A. Chlorine
- B. Hydrogen
- C. Oxygen
- D. Sodium
What is the oxidation number of chromium in K2CrO4?
- A. +1
- B. +2
- C. +4
- D. +6
Which of these cell notations is the correct representation of a Daniell cell?
- A. Zn(s) / Zn2+(aq) // Cu2+(aq)/Cu(s)
- B. Cu(s) / CU2+(aq) // Zn2+(aq) / Zn(s)
- C. Zn2+(aq) / Zn(s) // Cu2+(aq) /Cu(s)
- D. Cu2+(aq) / Cu(s) // Zn(s) / Zn2+(aq)
Consider the reaction represented by the following equation: N2(g) + 3H2(g) ⇌ 2NH3(g); ∆H = – 92kJmol1. Finely divided iron is used as catalyst in the reaction in order to
- A. lower the value of ∆H
- B. increase the time for attainment of equilibrium
- C. shorten the time for attainment of equilibrium
- D. decrease the yield of ammonia
A solution of a salt X reacts with AgNO3 solution to give white precipitate which dissolves in excess aqueous ammonia. X contains
- A. CI-
- B. Pb 2+
- C. SO 2-
- D. Zn2+
What process is illustrated below? S(s) ⇌H2O⇌ S (aq)
- A. Decomposition of a solid
- B. Melting of a solid
- C. Formation of saturated solution of a solid
- D. Sublimation of a solid
Which of the following compounds is a basic salt?
- A. Mg(NO3)2
- B. (NH4)2SO4
- C. K4Fe(CN)6
- D. Zn(OH)CI
Consider the reaction represented by the equation: Ca(OH)2(aq) + CO 2(g) → CaCO3(s) + H 2O(l)
in the reaction above, CO 2 acts as
- A. an acidic oxide
- B. an oxidizing agent
- C. a basic oxide
- D. a dehydrating agent
In which of the following compound (s) will heat be absorbed on adding water?
l. KNO\(_3\) II. Concentrated H\(_2\)SO\(_4\) III. NH\(_4\)CI
- A. I only
- B. lll only
- C. l and lll only
- D. ll and lll only
Which of the following statements is true of the molecules of a gas under ideal conditions? The molecules
- A. move at random
- B. undergo inelastic collisions
- C. attract each other
- D. occupy a large volume
Which of the following gases is light than air?
- A. CO2
- B. SO2
- C. HCI
- D. NH3
When air is successively passed through sodium hydroxide solution, alkaline pyrogallol and then concentrated tetraoxosulphate (VI) acid, its remaining components are
- A. oxygen and water vapour
- B. oxygen and nitrogen
- C. carbon (IV) acid and noble gases
- D. nitrogen and noble gases
What is the IUPAC name of the compound represented by the molecular formula NaCIO4?
- A. Sodium tetraoxochlorate (l)
- B. Sodium tetraoxochlorate (IV)
- C. Sodium tetraoxochlorate (VI)
- D. Sodium tetraoxochlorate(VII)
How many atoms are there in one mole of hydrogen gas? [Avogadro’s constant = 6.02 x 1023mol-1]
- A. 1.2 x 10 23
- B. 6.0 x 10 23
- C. 1.2 x10 24
- D. 6.0 x 10 24
14.8 g of a salt (z)dissolved in 250 cm3 of distilled water gives a concentration of 0.80 mol dm-3. Calculate the molar mass of the salt (z).
- A. 13.5 g mol-1
- B. 18.5 g mol-1
- C. 47.4 g mol-1
- D. 74.0 g mol-1
Which of the following species does not contain a co-ordinate bond?
- A. AI2CI6
- B. CCI4
- C. H3O+
- D. NH + 4
Which of the following compounds has hydrogen bonds between its molecules?
- A. HF
- B. HBr
- C. HCI
- D. HI.
If the difference between the electronegativities of two elements is large, the type of bond that can be formed between them is
- A. covalent
- B. dative
- C. ionic
- D. metallic
Which of the following statements about sodium is not true?
- A. Na+ is smaller in size than Na
- B. Na is smaller in size than Na+
- C. Na+ has fewer electrons than Na
- D. The effective nuclear charge in Na+ is greater than in Na