Tag: science & technology

Quizzes (551) Questions (11015)

Questions Related to science & technology

Multiple choice general knowledge science & technology

manganese(IV) sulfate

  1. Mn3(SO4)2

  2. Mn(SO4)2

  3. Mn3SO4

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Manganese(IV) indicates Mn^4+ ion. Sulfate is SO4^2- with a -2 charge. To balance the +4 charge of manganese, two sulfate ions are needed, giving Mn(SO4)2. Option B is correct.

Multiple choice general knowledge science & technology

potassium hydroxide

  1. KOH

  2. K2OH

  3. K(OH)2

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Potassium (K) forms a +1 ion, and hydroxide (OH) is a -1 polyatomic ion. They combine in a 1:1 ratio to give KOH. K2OH would imply K2+ which doesn't exist, and K(OH)2 would require a +2 charge.

Multiple choice general knowledge science & technology

nickel(II) nitrite

  1. Ni(NO2)3

  2. Ni2(NO2)2

  3. Ni3(NO2)2

  4. Ni(NO2)2
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Nickel(II) means Ni2+. Nitrite is NO2- with a -1 charge. To balance +2 and -1, you need two nitrite ions: Ni(NO2)2. Ni(NO2)3 would give -3, and the formulas for B and C don't balance charges.

Multiple choice general knowledge science & technology

zinc(II) nitrite

  1. Zn(NO2)2

  2. Zn2(NO2)3

  3. Zn2NO2

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Zinc(II) is Zn2+. Nitrite (NO2-) has a -1 charge. Two nitrite ions are needed to balance the +2 charge, giving Zn(NO2)2. Option B would give Zn4+ which doesn't exist, and Zn2NO2 doesn't balance.

Multiple choice general knowledge science & technology

platinum(II) carbonate

  1. Pt2CO3

  2. PtCO3

  3. Pt3(CO3)2

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Platinum(II) is Pt2+. Carbonate (CO3) has a -2 charge. The 2+ and 2- cancel in a 1:1 ratio, giving PtCO3. Pt2CO3 would be Pt4+, and Pt3(CO3)2 doesn't represent the correct charge balance.

Multiple choice general knowledge science & technology

aluminum sulfite

  1. AlSO3

  2. Al3(SO3)2

  3. Al2(SO3)3

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Aluminum is Al3+. Sulfite (SO3) has a -2 charge. To balance +3 and -2, you need the LCM: 2 aluminum atoms (+6 total) and 3 sulfite ions (-6 total), giving Al2(SO3)3. AlSO3 doesn't balance.

Multiple choice general knowledge science & technology

magnesium nitrite

  1. Mg(NO2)2

  2. Mg3(NO2)2

  3. Mg2(NO2)3

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Magnesium is Mg2+. Nitrite (NO2-) has a -1 charge. Two nitrite ions are needed to balance +2, giving Mg(NO2)2. Mg3(NO2)2 doesn't balance correctly, and Mg2(NO2)3 would be Mg4+.

Multiple choice general knowledge science & technology

barium sulfate

  1. Ba(SO4)2

  2. Ba(SO4)3

  3. Ba2(SO4)3

  4. BaSO4
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Barium (Ba) has a valency of +2, and the sulfate ion (SO4) has a valency of -2. When they combine, the charges balance in a 1:1 ratio, resulting in the chemical formula BaSO4. Other options incorrectly represent the ionic charges or stoichiometry.

Multiple choice general knowledge science & technology

nickel(II) sulfite

  1. NiSO3

  2. Ni2SO3

  3. Ni3(SO3)2

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Nickel(II) is Ni2+. Sulfite (SO3) has a -2 charge. They balance in a 1:1 ratio, giving NiSO3. Ni2SO3 would require Ni4+, and Ni3(SO3)2 doesn't represent Ni2+ correctly.