Q.1- A measured temperature on Fahrenheit scale is 200 °F. What will this reading be on Celsius scale?
Q.2- If 500 mL of a 5M solution is diluted to 1500 mL, what will be the molarity of the solution obtained?
(a) 1.5 M
(b) 1.66 M
(c) 0.017 M
(d) 1.59 M
Q.3- The number of atoms present in one mole of an element is equal to Avogadro number. Which of the following element contains the greatest number of atoms?
(a) 4g He
(b) 46g Na
(c) 0.40g Ca
(d) 12g He
Q.4- The density of dots in a region represents the probability density of finding electrons in the region. On the basis of above diagram which of the following statements is incorrect?
(a) 1s and 2s orbitals are spherical in shape.
(b) The probability of finding the electron is maximum near the nucleus.
(c) The probability of finding the electron at a given distance is equal in all directions.
(d) The probability density of electrons for 2s orbital decreases uniformly as distance from the nucleus increases.
Q.5- Which of the following statements about the electron is incorrect?
(a) It is a negatively charged particle.
(b) The mass of electron is equal to the mass of neutron.
(c) It is a basic constituent of all atoms.
(d) It is a constituent of cathode rays.
Q.6- Two atoms are said to be isobars if.
(a) they have same atomic number but different mass number.
(b) they have same number of electrons but different number of neutrons.
(c) they have same number of neutrons but different number of electrons.
(d) sum of the number of protons and neutrons is same but the number of protons is different.
Q.7- Which of the following elements can show covalency greater than 4?
(d) Both b and c
Q.8- Which of the following sequences contain atomic numbers of only representative elements?
(a) 3, 33, 53, 87
(b) 2, 10, 22, 36
(c) 9, 35, 51, 88
(d) Both a and c
Q.9- A person living in Shimla observed that cooking food without using pressure cooker takes more time. The reason for this observation is that at high altitude:
(a) pressure increases
(b) temperature decreases
(c) pressure decreases
(d) temperature increases
Q.10- As the temperature increases, average kinetic energy of molecules increases. What would be the effect of increase of temperature on pressure provided the volume is constant?
(c) remains same
(d) becomes half
Q.11- In which of the following, functional group isomerism is not possible?
(c) Alkyl halides
Q.12- The fragrance of flowers is due to the presence of some steam volatile organic compounds called essential oils. These are generally insoluble in water at room temperature but are miscible with water vapour in vapour phase. A suitable method for the extraction of these oils from the flowers is:
(c) Distillation under reduced pressure
(d) Steam distillation
Q.13- The molecules having dipole moment are ___________.
(a) 2, 2-Dimethylpropane
(d) Both b and c
Q.14- Which of the following statements is not true about classical smog?
(a) Its main components are produced by the action of sunlight on emissions of automobiles and factories.
(b) Produced in cold and humid climate.
(c) It contains compounds of reducing nature.
(d) It contains smoke, fog and sulphur dioxide.
Q.15- Biochemical Oxygen Demand, (BOD) is a measure of organic material present in water. BOD value less than 5 ppm indicates a water sample to be ___________.
(a) rich in dissolved oxygen.
(b) poor in dissolved oxygen.
(c) highly polluted.
(d) not suitable for aquatic life.