Electropositivity of elements across the periodic table normally
- A. remains constant down the group
- B. increases across the period
- C. decreases across the period
- D. decreases down the group
The atom with the electron configuration
1s\(^{2}\)2s\(^{2}\)2p63s\(^{2}\)3p\(^{6}\)3d\(^{10}\)4s\(^{2}\)4p\(^{4}\) is in
- A. period 4, p- block
- B. period 3, p- block
- C. period 4, d- block
- D. period 3, d- block
Which of the following statements about atoms of a metal is correct? They
- A. readily accept electrons
- B. are soft
- C. are held together by covalent bond
- D. are held together by a sea of electron cloud
An oxide has the following properties. It
I. is a white powder
II. reacts with HCI.
III. reacts with NaOH
IV. is insoluble in water
The oxide is
- A. alkaline
- B. amphoteric
- C. acidic
- D. neutral
The electron configuration of carbon atom in its excited state is
- A. 1s\(^{2}\)2s\(^{2}\)2px\(^{2}\)2py\(^{0}\)
- B. 1s\(^{2}\)2s\(^{2}\)2px\(^{1}\)2py\(^{1}\)
- C. 1s\(^{2}\)2s\(^{1}\)2px\(^{1}\)2py\(^{1}\)2pz\(^{1}\)
- D. 1s\(^{1}\)2s\(^{2}\)2px\(^{1}\)2py\(^{1}\)
Which of the following properties indicate that an element is a metal. It
I. reacts with oxygen to form an acidic oxide
II. forms ionic chlorides
III. has variable oxidation states
IV. displaces hydrogen from dilute HCl
- A. I and III only
- B. I and II only
- C. II and IV only
- D. I, II, III and IV
Ionization energy increases across the period in the periodic table because
- A. atomic number increases
- B. effective nuclear charge increases
- C. mass number decreases
- D. screening effect decreases
The IUPAC name of the compound CH3CH(CH3)CHCH2 is
- A. 2 - methyl but - 1 - ene
- B. 2 - methyl but - 2 - ene
- C. 3 - methyl but - 1 - ene
- D. 3 - methyl but - 2 - ene
The maximum number of covalent bonds formed by nitrogen is
- A. 1
- B. 2
- C. 3
- D. 4
Which of the following bond types is intermolecular?
- A. Covalent bond
- B. Hydrogen bond
- C. Ionic bond
- D. Metallic bond
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