Major Competitive Exams
Q. What is the next number in the series: 12, 24, 36, 48, ...? (2023)
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Solution
The series increases by 12 each time. The next number is 48 + 12 = 60.
Correct Answer: C — 72
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Q. What is the next number in the series: 2, 4, 8, 16, ?
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Solution
The series is a geometric progression where each number is multiplied by 2. Therefore, 16 * 2 = 32.
Correct Answer: C — 32
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Q. What is the next number in the series: 3, 6, 11, 18, ...? (2023)
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Solution
The differences between the numbers are 3, 5, 7, which increase by 2 each time. The next difference is 9, so 18 + 9 = 27.
Correct Answer: B — 26
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Q. What is the next number in the series: 5, 10, 20, 40, ...? (2023)
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Solution
The series is a geometric progression where each number is multiplied by 2. The next number is 40 * 2 = 80.
Correct Answer: D — 80
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Q. What is the next number in the series: 7, 14, 28, 56, ...? (2023)
A.
70
B.
112
C.
140
D.
168
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Solution
The series is a geometric progression where each number is multiplied by 2. The next number is 56 * 2 = 112.
Correct Answer: B — 112
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Q. What is the next shape in the sequence? (2022)
A.
Shape A
B.
Shape B
C.
Shape C
D.
Shape D
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Solution
Shape B follows the sequence logically based on the previous shapes.
Correct Answer: B — Shape B
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Q. What is the next term in the sequence: 3, 6, 11, 18, ?
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Solution
The differences are 3, 5, 7, which increase by 2 each time. 18 + 8 = 26.
Correct Answer: B — 26
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Q. What is the next term in the series: 2, 3, 5, 7, ?
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Solution
These are prime numbers: 2, 3, 5, 7, next is 11.
Correct Answer: C — 11
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Q. What is the normal pH range of human blood? (2019)
A.
6.8 - 7.2
B.
7.35 - 7.45
C.
7.0 - 7.5
D.
7.8 - 8.0
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Solution
The normal pH range of human blood is tightly regulated between 7.35 and 7.45, which is essential for proper physiological function.
Correct Answer: B — 7.35 - 7.45
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Q. What is the normal pH range of human urine? (2022)
A.
4.5 - 5.5
B.
6.0 - 7.0
C.
7.5 - 8.0
D.
9.0 - 10.0
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Solution
The normal pH range of human urine is typically between 6.0 and 7.0, indicating it is slightly acidic.
Correct Answer: B — 6.0 - 7.0
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Q. What is the normal respiratory rate for a healthy adult at rest? (2022)
A.
10-12 breaths per minute
B.
12-20 breaths per minute
C.
20-30 breaths per minute
D.
30-40 breaths per minute
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Solution
The normal respiratory rate for a healthy adult at rest is typically between 12 to 20 breaths per minute.
Correct Answer: B — 12-20 breaths per minute
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Q. What is the normality of a solution containing 1 mole of H2SO4 in 1 liter of solution?
A.
1 N
B.
2 N
C.
0.5 N
D.
4 N
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Solution
Normality (N) = equivalents of solute / liters of solution. H2SO4 provides 2 equivalents, so N = 2 moles / 1 L = 2 N.
Correct Answer: B — 2 N
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Q. What is the normality of a solution containing 2 moles of H2SO4 in 1 liter of solution?
A.
2 N
B.
4 N
C.
1 N
D.
0.5 N
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Solution
Normality (N) = equivalents of solute / liters of solution. H2SO4 provides 2 equivalents, so 2 moles × 2 = 4 N.
Correct Answer: B — 4 N
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Q. What is the normality of a solution containing 3 moles of H2SO4 in 1 liter of solution? (2022) 2022
A.
3 N
B.
6 N
C.
1.5 N
D.
0.5 N
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Solution
Normality (N) = n * molarity, where n = number of equivalents. For H2SO4, n = 2. Thus, N = 2 * 3 M = 6 N.
Correct Answer: B — 6 N
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Q. What is the normality of a solution containing 3 moles of H2SO4 in 2 liters of solution? (H2SO4 is a diprotic acid)
A.
3 N
B.
6 N
C.
1.5 N
D.
1 N
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Solution
Normality (N) = equivalents of solute / liters of solution. H2SO4 has 2 equivalents per mole, so 3 moles = 6 equivalents. Normality = 6 equivalents / 2 L = 3 N.
Correct Answer: B — 6 N
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Q. What is the normality of a solution containing 4 moles of H2SO4 in 2 liters of solution? (H2SO4 is a diprotic acid)
A.
4 N
B.
2 N
C.
8 N
D.
1 N
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Solution
Normality (N) = number of equivalents / liters of solution. H2SO4 has 2 equivalents per mole, so 4 moles = 8 equivalents. Normality = 8 equivalents / 2 L = 4 N.
Correct Answer: C — 8 N
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Q. What is the normality of a solution containing 4 moles of H2SO4 in 2 liters of solution?
A.
4 N
B.
8 N
C.
2 N
D.
1 N
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Solution
Normality (N) = equivalents of solute / liters of solution. H2SO4 has 2 equivalents, so 4 moles = 8 equivalents. N = 8 eq / 2 L = 4 N.
Correct Answer: B — 8 N
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Q. What is the normality of a solution that is 1 M in H2SO4?
A.
1 N
B.
2 N
C.
0.5 N
D.
4 N
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Solution
Normality (N) = Molarity (M) x number of equivalents. H2SO4 has 2 acidic protons, so 1 M x 2 = 2 N.
Correct Answer: B — 2 N
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Q. What is the number of atoms in 2 moles of aluminum (Al)? (2044)
A.
6.022 x 10^23
B.
1.2044 x 10^24
C.
3.011 x 10^23
D.
12.044 x 10^24
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Solution
Number of atoms = moles x Avogadro's number = 2 moles x 6.022 x 10^23 atoms/mole = 1.2044 x 10^24 atoms.
Correct Answer: B — 1.2044 x 10^24
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Q. What is the number of atoms in 2 moles of CaCO3?
A.
6.022 x 10^23
B.
1.2044 x 10^24
C.
3.011 x 10^23
D.
1.8066 x 10^24
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Solution
Each CaCO3 has 5 atoms (1 Ca, 1 C, 3 O). Number of atoms = moles x atoms per molecule x Avogadro's number = 2 moles x 5 x 6.022 x 10^23 = 1.206 x 10^24 atoms.
Correct Answer: D — 1.8066 x 10^24
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Q. What is the number of atoms in 2 moles of Na2SO4?
A.
6.022 x 10^23
B.
1.2044 x 10^24
C.
1.2044 x 10^25
D.
3.011 x 10^23
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Solution
Na2SO4 has 2 Na + 1 S + 4 O = 7 atoms. Number of atoms = moles x atoms per mole = 2 moles x 7 atoms = 14 atoms = 1.2044 x 10^24 atoms.
Correct Answer: B — 1.2044 x 10^24
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Q. What is the number of atoms in 2 moles of NaCl? (2044)
A.
6.022 x 10^23
B.
1.2044 x 10^24
C.
1.2044 x 10^25
D.
3.011 x 10^23
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Solution
Each NaCl unit has 2 atoms (Na and Cl). Therefore, 2 moles of NaCl contain 2 x 6.022 x 10^23 x 2 = 1.2044 x 10^24 atoms.
Correct Answer: B — 1.2044 x 10^24
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Q. What is the number of moles in 10 grams of H2? (2020)
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Solution
Molar mass of H2 = 2 g/mol. Number of moles = mass/molar mass = 10 g / 2 g/mol = 5 moles.
Correct Answer: A — 0.5
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Q. What is the number of moles in 10 grams of hydrogen gas (H2)? (2019)
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Solution
Molar mass of H2 = 2 g/mol. Number of moles = 10g/2g/mol = 5 moles.
Correct Answer: B — 0.5
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Q. What is the number of moles in 10 grams of Na?
A.
0.43
B.
0.22
C.
0.5
D.
0.1
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Solution
Molar mass of Na = 23 g/mol. Number of moles = mass / molar mass = 10 g / 23 g/mol = 0.43 moles.
Correct Answer: A — 0.43
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Q. What is the number of moles in 10 grams of NaOH?
A.
0.25
B.
0.5
C.
0.75
D.
1
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Solution
Molar mass of NaOH = 23 + 16 + 1 = 40 g/mol. Number of moles = mass/molar mass = 10 g / 40 g/mol = 0.25 moles.
Correct Answer: B — 0.5
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Q. What is the number of moles in 100 grams of NaOH?
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Solution
Molar mass of NaOH = 23 + 16 + 1 = 40 g/mol. Number of moles = mass/molar mass = 100 g / 40 g/mol = 2.5 moles.
Correct Answer: A — 1
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Q. What is the number of moles in 180 grams of glucose (C6H12O6)?
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Solution
Molar mass of C6H12O6 = 6*12 + 12*1 + 6*16 = 180 g/mol. Number of moles = mass/molar mass = 180 g / 180 g/mol = 1 mole.
Correct Answer: A — 1
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Q. What is the number of moles in 250 mL of a 2 M NaCl solution? (2021)
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Solution
Moles = Molarity x Volume (L) = 2 M x 0.250 L = 0.5 moles.
Correct Answer: A — 0.5
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Q. What is the number of moles in 44 grams of carbon dioxide (CO2)? (2023)
A.
1 mole
B.
2 moles
C.
0.5 moles
D.
0.25 moles
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Solution
The molar mass of CO2 is 44 g/mol. Therefore, 44 g of CO2 corresponds to 1 mole.
Correct Answer: A — 1 mole
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