Q.1:- Which of the following may be used as food preservative ?
- Benzene
- Sodium Benzoate
- Toluene
- Sodium Meta-Aluminate
Q.2:- It is reported that there is an ongoing decrease in the pH value of ocean water because of global warming. It happens due to ? [UPSC (CPF) Exam 2015]
- Larger uptake of CO2 by ocean water
- Lesser uptake of CO2 by ocean water
- Larger uptake of atmospheric Nitrogen by ocean water
- Lesser uptake of atmospheric nitrogen by ocean water
Q.3:- Which one of the following was used as a chemical weapon in the First World War ? [IAS Exam 1997]
- Carbon Monoxide
- Hydrogen Cyanide
- Mustard Gas
- Water Gas
Q.4:- It is dangerous to leave the car engine running in a closed garage, because it may cause serious pollution due to poisoning of emission of ?
- CO2
- CO
- Unburnt Petrol
- SO2
Q.5:- The water pollution in river is measured by the dissolved amount of ? [IAS Exams 1998]
- Chlorine
- Ozone
- Nitrogen
- Oxygen
Q.6:- Which one of the following diseases is caused through the wound or injury or surfaces of unsterilized surgical instruments ? [CDS Exam 2006]
- Kala Azar
- Chancroid
- Diptheria
- Tetanus
Q.7:- Which one of the following sets of elements was primarily responsible for the origin of life on the Earth ? [IAS Exam 2012]
- Hydrogen, Oxygen, Sodium
- Carbon, Hydrogen, Nitrogen
- Oxygen, Calcium, Phosphorous
- Carbon, Hydrogen, Potassium
Q.8:- The increasing abundance of greenhouse gases in atmosphere has led to the following effect except ? [CDS Exam 2007]
- Global Warming
- Depletion of Ozone Layer in the stratosphere
- Oxygen fertilization effect
- Carbon dioxide fertilization effect
Q.9:- The father of modern chemistry is ?
- Priestley
- Lavoisier
- Dalton
- Mendeleev
Q.10:- Diamond is ?
- An element
- A compound
- A mixture
- A liquid
Q.11:- Which one of the following substances does not have a melting point ? [NDA Exams 2006]
- Bromine
- Sodium Chloride
- Mercury
- Glass
Q.12:- The number of unpaired electrons in carbon atom is ?
- 2
- 4
- 1
- 3
Q.13:- Rutherford’s alpha-scattering experiment related to the size of the ?
- Nucleus
- Atom
- Electron
- Neutron
Q.14:- 31P15 and 30Si14 are called ?
- Isotopes
- Isotones
- Isobars
- None of the above
Q.15:- Which of the following elements is not radio-active ? [SSC Exams 2013]
- Zirconium
- Uranium
- Radium
- Plutonium
Q.16:- The compound which contains ionic bond is ?
- CH4
- N2
- CaCl2
- CCl4
Q.17:- Energy produced in nuclear reaction is given by ?
- Charle’s Law
- Grahm’s Law
- Gay-Lussac’s Law
- Einstein’s Law
Q.18:- An example of a covalent molecule is ? [SSC Exam 2013]
- Potassium Chloride
- Sodium Chloride
- Lead Chloride
- Carbon Tetrachloride
Q.19:- NaCl has ?
- Covalent Bond
- Ionic Bond
- Coordinate Bond
- None of the above
Q.20:- A reducing agent is a substance which can ?
- Accept electrons
- Donate electrons
- Accept protons
- Donate protons
Q.21:- The acidic Hydrogen is present in ?
- Ethyne
- Ethene
- Benzene
- Ethane
Q.22:- Breath analysers used by police to test drunken drivers works on the chemical basis of ? [SSC Exams 2015]
- Redox reactions
- Acid-base reactions
- Precipitation reactions
- Complexion reaction
Q.23:- Tartaric acid is obtained from ?
- Apples
- Citrus Fruit
- Grapes
- Tomato
Q.24:- Maleic acid is found in the ?
- Apples
- Vinegar
- Milk
- Lemon
Q.25:- The temperature at which the catalytic activity of the catalyst is maximum, is called ?
- Critical temperature
- Room Temperature
- Absolute Temperature
- Optimum Temperature