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 one of the following is not a periodic property ?
  1. Melting point of elements
  2. Boiling point of elements
  3. Ionization energy of elements
  4. Coordination number of ions
Question. When enthalpy of reactants is higher than product then reaction will be_________________?
  1. endothermic
  2. spontaneous
  3. non-spontaneous
  4. exothermic
Question. Which statement is wrong ?
  1. the amount of ozone layer is greater in the region close to the equator
  2. ozone acts as filter for UV radiations
  3. in the equatorial region it acts as pollutant
  4. CFCs play effective role in removing O3 in the stratosphere
Question. By the addition of base in waterpH will be_______________?
  1. more than 7
  2. less than 7
  3. equal to 7
  4. no effect
Question. Nitrates of which pair gives different products on thermal decomposition___________________?
  1. Na K
  2. Mg Ca
  3. Li Na
  4. Li Ca
Question. Nylon is obtained by heating___________________?
  1. Acrylic acid
  2. Epichlorohydrin
  3. Vinyl chloride
  4. Adipic acid with hexamethylene diamine
Question. Centrifugal forces are balanced in atom by__________________?
  1. Attractive forces
  2. Repulsive force
  3. Electrons
  4. Neutrons
Question. 18g glucose is dissolved in 90g water the relative lowering in vapour pressure is equal to ___________________?
  1. 8
  2. 5.1
  3. 6
  4. one/fifty one
Question. Which of the following can be used in laptops ?
  1. Silver oxide battery
  2. Fuel cell
  3. Nickel cadmium cell
  4. Lead accumulator
Question. 2nd orbit is ___________ away from nucleus of H-atom as compared to 1st orbit is ?
  1. 2-times
  2. 3-times
  3. 4-times
  4. 6 times
Question. In CCI4 I2 shows________________?
  1. Red colour
  2. Purple colour
  3. Blue colour
  4. Yellow colour
Question. The number of formula units in 29.25g of common salt_________________?
  1. 6.022 x 1023
  2. 3.01 x 1023
  3. 2 x NA
  4. 4 x 6.022 x 1023
Question. 95% ethanol is called_________________?
  1. methylated spirit
  2. wood spirit
  3. rectified spirit
  4. absolute alcohol