The determination of heat of combustion is carried out with
- A. a thermometer
- B. a bomb calorimeter
- C. an evaporating dish
- D. a boiling tube
Which of the following gases contains the highest number of atoms at s.t.p?
- A. 6 moles of neon
- B. 3 moles of oxygen
- C. 2 moles of chlorine
- D. 1 mole of ethane
A given volume of oxygen diffused through a porous partition in 8 seconds. How long would it take the same volume of carbon (IV) oxide to diffuse under the same condition? [C = 12.0, O = 16.0]
- A. 5.8 seconds
- B. 6.8 seconds
- C. 9.4 seconds
- D. 11.0 seconds
Which of the following apparatus can be used to measure accurately a specific volume of a liquid?
- A. Beaker
- B. Conical flask
- C. Measuring cylinder
- D. Pipette
What is the volume occupied by 2 moles of ammonia at s.t.p?
- A. 44.8 dm-3
- B. 22.4 dm-3
- C. 11.2 dm-3
- D. 5.6 dm-3
A solution of sodium trioxocarbonate (IV) contains 10.6g in 250cm3 of solution. Calculate the concentration of the solution. [Na2CO3 = 106.0]
- A. 0.4 mol dm-3
- B. 1.0 mol dm-3
- C. 10.6 mol dm-3
- D. 25.0 mol dm-3
Consider the neutralization reaction represented by the following equation: Na2CO3 + 2HNO 3 → 2NaNO3 + H2O + CO2 The stoichiometric ratio of acid to base is
- A. 2:2
- B. 2:1
- C. 1:2
- D. 1:1
The bonds in crystaline ammonium chloride are?
- A. covalent and dative
- B. ionic and covalent
- C. ionic covalent and dative
- D. ionic covalent and hydrogen bond
Which of the following molecules has a triple bond in its structure?
- A. CH4
- B. NH3
- C. N2
- D. O 2
Which of the following molecules has a linear shape?
- A. CH4
- B. CO 2
- C. H2S
- D. NH 3
A solid substance with high melting and boiling points is likely to be a/an
- A. covalent compound
- B. dative covalent compound
- C. electrovalent compound
- D. non-metal
Which of the following species correctly represented an ion of M with 13 protons and 10 electrons?
- A. 10M 3+
- B. 10M 3-
- C. 13M 3+
- D. 13M 3-
If X is a group lll element, its oxide would be represented as
- A. X3O2
- B. X3O
- C. X2O3
- D. XO3
Which of the following statements about chlorine and iodine at room temperature is correct?
- A. Chlorine is gas and iodine is solid
- B. Chlorine is liquid and iodine is gas
- C. Chlorine and iodine are gases
- D. Chlorine is solid and iodine is liquid
Which of the following elements is a d-block element?
- A. Calcium
- B. lron
- C. Lithium
- D. Silicon
The energy change which accompanies the addition of an electron to a gaseous atom is
- A. atomization
- B. electron affinity
- C. electronegativity
- D. ionization
Which of the following equations represents beta decay?
- A. \(\frac{14}{7}\)N + \(\frac{4}{2}\)He → \(\frac{8}{17}\)O + \(\frac{1}{1}\)H
- B. \(\frac{8238}{92}\)U → \(\frac{234}{90}\)Th + \(\frac{4}{2}\)He
- C. \(\frac{8238}{92}\)U → \(\frac{239}{93}\)Np + \(\frac{0}{-1}\)e
- D. \(\frac{13}{7}\)N + \(\frac{4}{2}\)He → \(\frac{16}{8}\)O + \(\frac{1}{1}\)H
Which of the following noble gases has electronic structure similar to that of N in NH\(_3\)? [\(^{14}_7\)N]
- A. 2He
- B. 10Ne
- C. 18Ar
- D. 36Kr
Which of the following elements exhibits the same chemical properties as the atom \(\frac{35}{17}\)X? An element with
- A. atomic number 17
- B. atomic number 18
- C. mass number 35
- D. mass number 52
An important medical use of nuclear radiations is
- A. activation analysis
- B. carbon dating
- C. radiotherapy
- D. tissue regeneration
The electron configuration of carbon atom in its excited state is [ 6C]
- A. 1s22s 22px12py 1
- B. 1s 2 2s 22px 22pyo
- C. 1s12s22px12py12pz1
- D. 1s 22s12px12py12pz1