Mock Test-3 (Paper-1) (Question 51-100)

Total Questions: 50

31. Which one of the following forms an irreversible complex with hemoglobin of the blood?

Correct Answer: (c) Carbon monoxide
Solution:Carbon monoxide gas forms an irreversible complex with the hemoglobin of the blood.

32. The gas used in the manufacture of Vanaspati Ghee from Vanaspati Oil is -

Correct Answer: (a) Hydrogen
Solution:Vanaspati ghee is manufactures from vegetable oil by a process called 'hydrogenation' By passing hydrogen gas. Vegetable Oil contains unsaturated fatty acids; upon hydrogenation it is converted into saturated fatty acids to form Vanaspati ghee.

33. Methyl Isocyanate gas, which was involved in the disaster in Bhopal in December 1984, was used in the Union Carbide factory for production of:

Correct Answer: (d) Pesticides
Solution:Methyl Isocyanate gas (MIC) is used in preparation of agricultural product pesticide, a posionous substance.

34. Which of the following are the properties of an electron?

1. Electron is a constituent of cathode ray

2. Electron is a negatively charged particle

3. The mass of the electron is equal to the mass of the proton

4. Electron is deflected by the electric field but not by magnetic field

Select the correct answer using the code given below:

Correct Answer: (a) 1 and 2 only
Solution:Cathode rays are composed of negatively charged particle electron.

35. In the process of electroplating a utensil with zinc,

Correct Answer: (c) the utensil is made the cathode and pure zinc is made the anode
Solution:The zinc serves as a sacrificial anode, so that it cathodic ally protects exposed steel.

36. Which of the following is a chemical change?

Correct Answer: (b) Burning of magnesium in air
Solution:Physical changes no new product (s) are formed. Chemical changes are those which are irreversible and involves formation of new product (s). Burning of magnesium is chemical change in which magnesium oxide is formed  2Mg + O₂ → 2MgO

37. Hydrofluoric acid is not kept in glass bottles because it reacts with

Correct Answer: (d) silicon dioxide of glass
Solution:Hydrofluoric acid is one of the most dangerous acids known. It needs to be treated differently than even strong acids like sulphuric and hydrochloric. HF reacts with many materials, therefore, should be avoided from coming in contact with glass, concrete, metals, water other acids, oxidizers, reducers, alkalis, combustibles, organics and ceramics

Hydrofluoric acid slowly dissolves silicon dioxide (SiO₂) which is a major component of most of the types of glass. It forms water soluble Hexafluoro silicic acid (H2SiF6) and gaseous silicon tetrafluoride (SiF4). This particular property of the acid is used to etch glass for removing particularly stubborn stains.

38. The tracking of people by trained dogs is based on the recognition of which of the following compounds in the sweat from feet?

Correct Answer: (a) Carboxylic acids
Solution:The tracking of people by trained dogs is based on the recognition of carboxylic acid in sweat from feet.

39. From which mineral is radium obtained.

Correct Answer: (c) Pitchblende
Solution:Radium was discovered in 1898 by Madame Curie from pitchblende a material that contains uranium.

40. C11 - L - methyl-methionine is used for

Correct Answer: (a) brain tumor and parathyroid imaging
Solution:C11 - L - methyl-methionine is used in position emission tomography (PET) to locate and differentiate primary brain tumor and also to monitor the therapeutic effect of tumour irradiation.