Science - Atoms and Molecules
Exam Duration: 45 Mins Total Questions : 30
Identify the symbols of lead and mercury respectively
- (a)
Hg, Pb
- (b)
Pb, Hg
- (c)
Le, Me
- (d)
Ld, My
How many moles of oxygen atoms are present in one mole of acetic acid?
- (a)
1 mole
- (b)
3 moles
- (c)
2 moles
- (d)
6 moles
Calculate the weight in grams present in 0.7 moles of sodium.
- (a)
\({ 16.1 }_{ g }\)
- (b)
\({ 16.2 }_{ g }\)
- (c)
\({ 16.3 }_{ g }\)
- (d)
\(0.161_{ g }\)
How many moles are present in 540 g of glucose\({ C }_{ 6 }{ H }_{ 12 }{ O }_{ 6 }\) ?
- (a)
2 moles
- (b)
3 moles
- (c)
4 moles
- (d)
1 mole
The approximate production of sodium carbonate per month is 424 x \({ 10 }^{ 6 }\)g while that of methyl alcohol is 320x \({ 10 }^{ 6 }\)g Which of the following is produced more in terms of number of moles?
- (a)
Sodium carbonate
- (b)
Methyl alcohol
- (c)
Both (A) and (B)
- (d)
Data insufficient
Calculate the weight of 3.0 moles of \(KC/{ O }_{ 3 }\)
- (a)
245 g
- (b)
249 g
- (c)
367.5 g
- (d)
24.5 g
Identify the correct increasing order of molecular weights of the given compounds.
- (a)
\({ H }_{ 2 }O>{ H }_{ 2 }S>{ CO }_{ 2 }>{ SO }_{ 2 }\)
- (b)
\({ H }_{ 2 }O>{ H }_{ 2 }S<{ CO }_{ 2 }>{ SO }_{ 2 }\)
- (c)
\({ H }_{ 2 }O<{ H }_{ 2 }S<{ CO }_{ 2 }<{ SO }_{ 2 }\)
- (d)
\({ H }_{ 2 }O>{ H }_{ 2 }S>{ CO }_{ 2 }<{ SO }_{ 2 }\)
Calculate the number of moles present in 400 grams of \({ Caco }_{ 3 }\)
- (a)
2 moles
- (b)
3 moles
- (c)
1 mole
- (d)
4 moles
Calculate the number of atoms present in 6.4 g of sulphur.
- (a)
\(2.4\times { 10 }^{ 23 }\quad atoms\)
- (b)
\(2.4\times { 10 }^{ -23 }\quad atoms\)
- (c)
\(1.2\times { 10 }^{ 23 }\quad atoms\)
- (d)
\(1.2\times { 10 }^{ -23 }\quad atoms\)
How many gram atoms are present in 256g of \({ O }_{ 2 }\)
- (a)
6 gram atoms
- (b)
32 gram atoms
- (c)
14 gram atoms
- (d)
36 gram atoms
Calculate the number of atoms present in 71g of \({ CI }_{ 2 }\)
- (a)
\(1.205\times \)\({ 10 }^{ -24 }\)
- (b)
\(1.205\times { 10 }^{ 23 }\)
- (c)
\(1.205\times { 10 }^{ 24 }\)
- (d)
\(1.205\times { 10 }^{ -23 }\)
Calculate the weight in grams of 0.75 gram moles of NaHC\({ O }_{ 3 }\)
- (a)
64 9
- (b)
63 g
- (c)
65 g
- (d)
66 g
How many grams of \(Na_{ 2 }C{ O }_{ 3 }\) are to be weighed to get 0.1 mole \(Na_{ 2 }C{ O }_{ 3 }\)
- (a)
10 g
- (b)
5 g
- (c)
10.6 g
- (d)
12.6 g
A molecular formula is a short form representation of 'X: Identify 'X' from the following
- (a)
A compound
- (b)
An element
- (c)
A mixture
- (d)
An alloy
Calculate the weight of 0.8 moles of magnesium
- (a)
20g
- (b)
19.2 g
- (c)
30 g
- (d)
31.2 g
Calculate the number of grams present in 0.5 moles of acetylene.
- (a)
13g
- (b)
14g
- (c)
16g
- (d)
13.5g
Calculate the number of iron atoms in a piece of iron weighing 2.8 g. (Atomic mass of iron = 56)
- (a)
\(30.11\times { 10 }^{ 23 }\) atoms
- (b)
\(30.1\times { 10 }^{ 23 }\)atoms
- (c)
\(3.0115\times { 10 }^{ 22 }\)atoms
- (d)
\(301.1\times { 10 }^{ 23 }\)atoms
If the formula of chromic acid is \(H_{ 2 }{ CrO }_{ 4 }\)then what is the formula of divalent metal chromate?
- (a)
\(M{ CrO }_{ 4 }\)
- (b)
\(M_{ 2 }{ CrO }_{ 4 }\)
- (c)
\(M_{ 2 }{ (CrO }_{ 4 })_{ 3 }\)
- (d)
\(M_{ 3 }{ CrO }_{ 4 }\)
Calculate the number of moles of zinc in 23.3 g.
- (a)
0.37 moles
- (b)
0.36 moles
- (c)
0.5 moles
- (d)
0.53 moles
How many grams of sodium oxalate are to be weighed to get 0.1 mole of sodium oxalate (\({ Na }_{ 2 }C_{ 2 }{ O }_{ 4 }\))?
- (a)
13.4 g
- (b)
1.34 g
- (c)
134 g
- (d)
0.134 g
Calculate the number of atoms of sulphur present in 0.5 moles of \({ Na }_{ 2 }S_{ 2 }{ O }_{ 3 }\)
- (a)
\(62.02\times 10^{ 23 }atoms\)
- (b)
\(622\times 10^{ 23 }atoms\)
- (c)
\(6.023\times 10^{ 23 }atoms\)
- (d)
\(6.02\times 10^{ -23 }\)
How many moles are present in 5.3 g of anhydrous sodium carbonate?
- (a)
0.03 moles
- (b)
0.04 moles
- (c)
0.05 moles
- (d)
0.01 moles
What will be the weight of 0.1 mole \({ CaCO }_{ 3 }\) of in grams?
- (a)
11 g
- (b)
12 g
- (c)
3 g
- (d)
10g
Calculate the weight of sulphur present in 1.5 moles of hydrogen sulphide.
- (a)
48 g
- (b)
50 g
- (c)
60 g
- (d)
70 g
Calculate the mass of one molecule of H2O
- (a)
\(29.88\times 10^{ 23 }g\)
- (b)
\(2.988\times 10^{ 23 }g\)
- (c)
\(0.2988\times 10^{ 23 }g\)
- (d)
\(2.988\times 10^{ -23 }g\)
What weight of sodium contains the same number of atoms as those in 8 grams of oxygen?
- (a)
10.5 g
- (b)
13.5 g
- (c)
11.5 g
- (d)
14.2 g
Carbon and oxygen react to produce carbon dioxide. What is the weight of oxygen required to convert 1.5 g of carbon to carbon dioxide?
- (a)
2 g
- (b)
6 g
- (c)
1 g
- (d)
4 g
Selenium ingestion of 90 micrograms per day causes loss of hair.How many selenium atoms are there in this sample?(Atomic weight of Se= 78.96)
- (a)
\(6.8\times 10^{ 23 }atom\)
- (b)
\(8.8\times 10^{ 17 }atoms\)
- (c)
\(8.8\times 10^{ 22 }atoms\)
- (d)
\(6.9\times 10^{ 17 }atoms\)
Which of the following element's gram weight is 6 9 for 0.25 moles of that element?
- (a)
Chlorine
- (b)
Magnesium
- (c)
Boron
- (d)
Carbon
How many gram atoms and number of atoms are present in 20 g of calcium?
- (a)
\(0.05gram\quad atoms\quad and3.1\times l0^{ 23 }atoms\)
- (b)
\(0.5gram\quad atoms\quad and3.01\times 10^{ 23 }atoms\)
- (c)
\(0.5gram\quad atoms\quad and3.1\times 10^{ 23 }atom\)
- (d)
\(0.2gram\quad atoms\quad and3.1\times 10^{ 23 }atoms\)