MCQs4All - Chemistry Collection

Chemistry MCQs for NTS, FPSC, CSS, PPSC, PMS, UTS, FTS, OTS, Teaching, CT, PTC, SST, B.Ed, M.Ed of past papers

Question. Which of the elements do not fall in stair case of the modern periodic table__________________?
  1. Si
  2. As
  3. Te
  4. None of the above
Question. The atoms of same element having same atomic number but different mass number are called____________________?
  1. Isobars
  2. Isomers
  3. Isotopes
  4. Isotropes
Question. True increasing order of acidity of the oxides of Mn is_________________?
  1. MnO < MnO2 < Mn2O7
  2. Mn2O7 > MnO2 > MnO
  3. MnO2 > MnO > Mn2O7
  4. MnO2 > Mn2O7 > MnO
Question. Water of crystallization can be removed by________________?
  1. drying
  2. heating
  3. evaporation
  4. All of the above
Question. Orgosterol is__________________?
  1. Orgocalciferol
  2. Vitamin D2
  3. Sterol
  4. all of the above
Question. Which one of the following is a buffer solution ?
  1. brine
  2. blood
  3. glue
  4. solution of CuSO4
Question. For industrial preparation of CH3CHO catalytic promoter is_________________?
  1. PdCl2
  2. Cu2Cl2
  3. CuCl2
  4. PbCl2
Question. Acid present in acid rain may be__________________?
  1. H2SO4
  2. HNO3
  3. both A and B
  4. none
Question. When CO2 is made to react with ethy1 magnesium iodide in dry ether followed by acid hydrolysis yields______________?
  1. Carboxylic acid
  2. Ethanoic acid
  3. Propanoic acid
  4. Butanoic acid
Question. What catalyst is employed when benzene is prepared from acetylene at 70°C?
  1. Cr2O3 + A2O3 + SiO2
  2. Raney nickel
  3. Organo-nickel
  4. Ni 250 – 300°C
Question. Which statement is consistent with Hunds rule ?
  1. Electrons fill orbitals with parallel spins until all the orbitals of the same energy are half filled then they go into sub-shells with anti-parallel (opposite) spin.
  2. The electrons in the same atom cannot have the same four quantum numbers
  3. There is maximum of two electrons is an orbital.
  4. None
Question. Which of the following way in used for classification of chromatography ?
  1. Shape
  2. Phase
  3. Mechanism
  4. All
Question. A single chlorine free radical can destroy how many ozone molecules ?
  1. 10
  2. 100
  3. 10000
  4. 100000