Q. Liquid nitrogen can be used as -
1) Coolant for computers
2) Method for instantly freezing food and drinks
3) cryopreservation of biological samples
4) All of the above
Q. Which of the following is a volatile organic compound?
1) Acetaldehyde
2) Sulphuric Acid
3) Hydrochloric Acid
4) Both (1) and (2)
Q. Which of the following gases leaked during the Bhopal gas tragedy?
1) Methyl isocyanide
2) Methyl isocyanate
3) Ethyl isocyanide
4) Ethyl isocyanate
Q. Which one among the following is an example of chemical change?
1) Sublimation of camphor
2) Melting of ice
3) Heating of an iron rod
4) Mixing of NaOH and HCl
Q. For Aluminium (Al) (atomic number: 13, mass number: 27), which one among the following statements is not correct?
1) The number of electrons present in Al is 13
2) The number of protons present in Al is 13
3) The number of neutrons present in Al is 14
4) The valency of Al is 2
Q. Which one among the following has a valency of 3?
1) Carbon
2) Oxygen
3) Nitrogen
4) Sodium
Q. Which one among the following is an example of an oxidation reaction?
1) Freezing of water
2) Dissolving sugar in water
3) Rusting of iron
4) Boiling of petrol
Q. What is the maximum number of electrons that can occupy the first shell of an atom?
1) 2
2) 4
3) 8
4) 16
Q. Which one among the following is commonly used as an antiskinning agent in paints?
1) Gelatin
2) N-methyl pyrrolidone
3) Pyridine
4) Polyhydroxy phenol
Q. The chemical reaction: 2AgCl(s) → 2Ag(s) + Cl2(g) takes place -
1) In dark
2) In sunlight
3) on heating
4) Under high pressure
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