Which one of following is not a property of pure quartz ?
Which one of following is not a property of pure quartz ?
A. Coloured solid
B. Brittle
C. Hard
D. All of above
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Main use of salt in diet is to : ___________?
Main use of salt in diet is to : ___________?A. ease the process of cooking
B. increase the taste
C. produce small amount of hydrochloric acid required for digestion
D. inclease solubility of food particles in water1 molar solution of glucose in water contains weight of glucose________________?
1 molar solution of glucose in water contains weight of glucose________________?A. 180g/dm3
B. 170g/dm3
C. 190g/dm3
D. 195g/dm3The number of lone pairs in XeOF4 is_________?
The number of lone pairs in XeOF4 is_________?A. O
B. 1
C. 2
D. 3Greater value of standard reduction potential greater will be tendency__________________?
Greater value of standard reduction potential greater will be tendency__________________?A. to get oxidized
B. to get reduced
C. to accept electrons
D. both B and CWhich of the following is a substance?
Which of the following is a substance?
A. Sea water
B. Brass
C. Tape water
D. Graphite
E. SandIn chemistry, a substance refers to a matter which has specific composition and specific properties which do not change. A substance can be an element or a compound. A substance typically has a constant composition, which can not be separated by physical methods. Seawater and sand are not substances, because they have varied compositions and their components can be separated by physical methods.
The average salinity of sea water is________?
The average salinity of sea water is________?A. 3%
B. 3.5%
C. 2.5%
D. 2%