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.
-
Question 451: The product formed when propanol is heated over a copper catalyst in the absence of oxygen are
Options:
A) CH3CH2CHO and H2
B) CH3CHO and CO2
C) CH3CH2COOH and H2
D) CH3COOH and CO2
Show Answer
The correct answer is D .
-
Question 452:
Hard water is water with high concentrations of dissolved ions, in particular calcium and
Options:
A) magnesium ions
B) nitrogen ions
C) phosporus ions
D) helium ions
Show Answer
The correct answer is A .
-
Question 453: If an equilibrium reaction has ∆H < O, the reaction will proceed favorably in the forward reaction at?
Options:
A) low temperatures
B) high temperatures
C) all temperatures
D) all pressures
Show Answer
The correct answer is A .
-
Question 454: The oxidation number of manganese in KMnO4 is?
Options:
A) +1
B) +3
C) +5
D) +7
E) +2
Show Answer
The correct answer is D .
-
Question 455: To make coloured glasses, small quantities of oxides of metals which form coloured silicates are often added to the reaction mixture consisting of Na2CO3 and SiO2. Such a metals is a?.
Options:
A) pottasium
B) barium
C) zinc
D) copper
Show Answer
The correct answer is D .
-
Question 456:
What type of reaction is involved in the formation of alkanols from alkenes?
Options:
A) Elimination reaction
B) Redox reaction
C) Substitution reaction
D) Addition reaction
Show Answer
The correct answer is D .
-
Question 457: Due to the high reactivity of sodium, it is usually stored under
Options:
A) water
B) mercury
C) paraffin
D) phenol
Show Answer
The correct answer is C .
-
Question 458:
2Na 2 O 2(s) + 2H 2 O 2(1) → 4 NaOH(s) +O2(s)
The substance that is oxidized in the reaction above is
Options:
A) 2NaO2(s)
B) NaOH(aq)
C) H2O(1)
D) O2(g)
Show Answer
The correct answer is A .
-
Question 459: The property which makes alcohol soluble in water is the
Options:
A) boiling point
B) hydrogen bonding
C) ionic character
D) covalent nature
Show Answer
The correct answer is B .
-
Question 460:
Which of the following reactions is an oxidation process?
Options:
A) 2H + 2e H
B) 2O + 4e O
C) OCl + HO + 2e 2OH + Cl
D) Cl + e Cl
Show Answer
The correct answer is B .