Chemistry is the study of the substances that make up matter. It looks at their properties, how they react with each other, and how these reactions can create new substances.
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Question 291: When each of the nitrates of Potassium, Magnesium and iron is heated,
Options:
A) all the nitrates decompose to their oxides
B) the nitrate of magnesium gives the nitrite and oxygen
C) the nitrates of iron magnesium and iron give the oxides
D) the nitrate of iron gives the nitrite and oxygen
E) the nitrate of the magnesium is not decomposed
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The correct answer is C .
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Question 292:
How many alkoxyalkanes can be obtained from the molecular formula CHO?
Options:
A) 4
B) 2
C) 1
D) 3
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The correct answer is D .
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Question 293: 3. 06 g of a sample of potassium trioxochlorate (V) (KCIO) was required to make a saturated solution with 10cm3 of water at 25oC. The solubility of the salt at 25oC is [K =39, Cl = 35.5, O = 16]
Options:
A) 5.0 moles dm3
B) 3.0 moles dm3
C) 2.5 moles dm3
D) 1.0 molesv
E) 0.5 moles dm3
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The correct answer is C .
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Question 294:
The salt that reacts with dilute hydrochloric acid to produce a pungent smelling gas which decolourizes acidified purple potassium tetraoxomanganate (VII) solution is
Options:
A) NaSO
B) NaSO
C) NaS
D) NaCO
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The correct answer is B .
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Question 295:
What is the state of matter in which particles are widely spaced and move freely with high kinetic energy?
Options:
A) Liquid
B) Solid
C) Plasma
D) Gas
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The correct answer is D .
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Question 296: The number of isomers that can be obtained from 04R0 is
Options:
A) 3
B) 4
C) 1
D) 5
E) 2
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The correct answer is E .
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Question 297: Oil spillage in ponds and creeks can be cleaned up by?
Options:
A) burning off the oil layer
B) spraying with detergent
C) dispersal with compressed air
D) spraying with hot water
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The correct answer is B .
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Question 298: The arrangement of particles in crystal lattices can be studied using
Options:
A) X-rays
B) -rays
C) -rays
D) -rays
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The correct answer is A .
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Question 299: An example of oxidation - reduction enzyme is
Options:
A) amylase
B) protease
C) lipase
D) dehydrogenase
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The correct answer is D .
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Question 300: Which of the following statements is NOT true of electrovalent compounds?
Options:
A) They are solids
B) They do not vaporized easily
C) They usually dissolve in water
D) The elements forming the compounds normally have their valency electrons in a shared state
E) They conduct electricity
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The correct answer is D .