MHT-CET
Q. What is the common oxidation state of nitrogen in ammonia (NH3)? (2023) 2023
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Solution
In ammonia (NH3), nitrogen has an oxidation state of -3.
Correct Answer: A — -3
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Q. What is the concentration in mol/L of a solution made by dissolving 58.5 grams of NaCl in 1 liter of water? (Molar mass of NaCl = 58.5 g/mol) (2023) 2023
A.
1 M
B.
0.5 M
C.
2 M
D.
0.25 M
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Solution
Moles of NaCl = 58.5 g / 58.5 g/mol = 1 mole. Molarity = 1 mole / 1 L = 1 M.
Correct Answer: A — 1 M
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Q. What is the concentration of a solution if 5 g of NaOH is dissolved in 250 mL of water? (2020)
A.
0.5 M
B.
1 M
C.
0.2 M
D.
0.1 M
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Solution
Moles of NaOH = 5 g / 40 g/mol = 0.125 mol. Molarity = 0.125 mol / 0.25 L = 0.5 M.
Correct Answer: B — 1 M
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Q. What is the concentration of H+ ions in a solution with pH 3? (2019) 2019
A.
0.001 M
B.
0.01 M
C.
0.1 M
D.
1 M
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Solution
Concentration of H+ = 10^(-pH) = 10^(-3) = 0.001 M.
Correct Answer: B — 0.01 M
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Q. What is the concentration of H+ ions in a solution with pH 4?
A.
0.0001 M
B.
0.01 M
C.
0.1 M
D.
1 M
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Solution
[H+] = 10^(-pH) = 10^(-4) = 0.0001 M.
Correct Answer: A — 0.0001 M
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Q. What is the coordinates of the centroid of the triangle with vertices (0, 0), (6, 0), and (3, 6)? (2022)
A.
(3, 2)
B.
(2, 3)
C.
(3, 3)
D.
(4, 2)
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Solution
Centroid = ((0+6+3)/3, (0+0+6)/3) = (3, 2).
Correct Answer: A — (3, 2)
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Q. What is the coordination number of the central metal ion in the complex ion [Co(NH3)6]Cl3? (2021)
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Solution
In the complex ion [Co(NH3)6]Cl3, the central metal ion Co is surrounded by 6 ammonia (NH3) ligands, which gives it a coordination number of 6.
Correct Answer: C — 6
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Q. What is the coordination number of the complex ion [Co(NH3)5Cl]Cl2? (2023)
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Solution
In the complex [Co(NH3)5Cl]Cl2, cobalt is surrounded by five ammonia ligands and one chloride ligand, giving it a coordination number of 6.
Correct Answer: C — 6
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Q. What is the coordination number of the complex ion [Co(NH3)6]Cl3? (2022) 2022
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Solution
The coordination number is determined by the number of ligands attached to the central metal ion. Here, Co is surrounded by 6 NH3 ligands.
Correct Answer: B — 6
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Q. What is the cross product of vectors A = i + j and B = j + k? (2022)
A.
i + k
B.
i - k
C.
j - i
D.
k - j
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Solution
A × B = |i j k| |1 1 0| |0 1 1| = i(1*1 - 0*1) - j(1*1 - 0*0) + k(1*0 - 1*0) = i - j.
Correct Answer: A — i + k
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Q. What is the current through a 10Ω resistor connected to a 20V battery? (2020)
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Solution
Using Ohm's law, I = V/R = 20V / 10Ω = 2A.
Correct Answer: B — 2A
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Q. What is the current through a 12Ω resistor connected to a 24V battery? (2023)
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Solution
Using Ohm's law, I = V/R = 24V / 12Ω = 2A.
Correct Answer: B — 2A
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Q. What is the current through a 12Ω resistor when a voltage of 48V is applied? (2023)
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Solution
Using Ohm's law, I = V/R = 48V / 12Ω = 4A.
Correct Answer: B — 6A
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Q. What is the derivative of f(x) = 1/x?
A.
-1/x^2
B.
1/x^2
C.
-x
D.
x
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Solution
The derivative f'(x) = d/dx(1/x) = -1/x^2.
Correct Answer: A — -1/x^2
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Q. What is the derivative of f(x) = 3x^2 + 5x - 7? (2021) 2021
A.
3x + 5
B.
6x + 5
C.
6x - 5
D.
3x^2 + 5
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Solution
The derivative f'(x) = d/dx(3x^2 + 5x - 7) = 6x + 5.
Correct Answer: B — 6x + 5
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Q. What is the derivative of f(x) = 5x^4?
A.
20x^3
B.
5x^3
C.
15x^3
D.
4x^3
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Solution
The derivative f'(x) = d/dx(5x^4) = 20x^3.
Correct Answer: A — 20x^3
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Q. What is the derivative of f(x) = e^(2x)?
A.
2e^(2x)
B.
e^(2x)
C.
e^(x)
D.
2x*e^(2x)
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Solution
Using the chain rule, f'(x) = d/dx(e^(2x)) = 2e^(2x).
Correct Answer: A — 2e^(2x)
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Q. What is the derivative of f(x) = x^3 - 4x + 6?
A.
3x^2 - 4
B.
3x^2 + 4
C.
x^2 - 4
D.
3x^2 - 6
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Solution
The derivative f'(x) = d/dx(x^3 - 4x + 6) = 3x^2 - 4.
Correct Answer: A — 3x^2 - 4
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Q. What is the derivative of f(x) = x^3 - 4x?
A.
3x^2 - 4
B.
3x^2 + 4
C.
x^2 - 4
D.
3x^2 - 2
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Solution
The derivative f'(x) = d/dx(x^3 - 4x) = 3x^2 - 4.
Correct Answer: A — 3x^2 - 4
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Q. What is the derivative of f(x) = x^4 + 2x^3 - x + 1? (2017)
A.
4x^3 + 6x^2 - 1
B.
4x^3 + 2x^2 - 1
C.
3x^3 + 6x^2 - 1
D.
4x^3 + 2x - 1
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Solution
The derivative f'(x) = d/dx(x^4 + 2x^3 - x + 1) = 4x^3 + 6x^2 - 1.
Correct Answer: A — 4x^3 + 6x^2 - 1
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Q. What is the determinant of G = [[1, 1, 1], [1, 2, 3], [1, 3, 6]]? (2023)
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Solution
Det(G) = 1(2*6 - 3*3) - 1(1*6 - 1*3) + 1(1*3 - 1*2) = 1(12 - 9) - 1(6 - 3) + 1(3 - 2) = 3 - 3 + 1 = 1.
Correct Answer: A — 0
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Q. What is the determinant of G = [[1, 2], [2, 4]]? (2020)
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Solution
Determinant of G = (1*4) - (2*2) = 4 - 4 = 0.
Correct Answer: A — 0
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Q. What is the determinant of G = [[2, 2], [2, 2]]? (2020)
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Solution
Det(G) = (2*2) - (2*2) = 4 - 4 = 0.
Correct Answer: A — 0
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Q. What is the determinant of H = [[3, 1], [2, 4]]? (2023)
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Solution
The determinant of H is calculated as (3*4) - (1*2) = 12 - 2 = 10.
Correct Answer: A — 10
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Q. What is the determinant of the identity matrix I = [[1, 0], [0, 1]]? (2021)
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Solution
Det(I) = (1*1) - (0*0) = 1 - 0 = 1.
Correct Answer: B — 1
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Q. What is the determinant of the matrix E = [[1, 2, 3], [0, 1, 4], [5, 6, 0]]? (2021)
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Solution
The determinant of E is calculated using the rule of Sarrus or cofactor expansion, resulting in -14.
Correct Answer: A — -14
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Q. What is the determinant of the matrix \( A = \begin{pmatrix} 1 & 2 \\ 3 & 4 \end{pmatrix} \)? (2021)
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Solution
The determinant of a 2x2 matrix \( A = \begin{pmatrix} a & b \\ c & d \end{pmatrix} \) is given by \( ad - bc \). Here, \( 1*4 - 2*3 = 4 - 6 = -2 \).
Correct Answer: A — -2
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Q. What is the determinant of the matrix \( F = \begin{pmatrix} 1 & 2 & 3 \\ 0 & 1 & 4 \\ 5 & 6 & 0 \end{pmatrix} \)? (2022)
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Solution
Using the determinant formula for 3x3 matrices, we find \( 1(1*0 - 4*6) - 2(0*0 - 4*5) + 3(0*6 - 1*5) = 1(0 - 24) - 2(0 - 20) + 3(0 - 5) = -24 + 40 - 15 = 1 \).
Correct Answer: A — -14
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Q. What is the determinant of the matrix \( G = \begin{pmatrix} 2 & 3 \\ 5 & 7 \end{pmatrix} \)? (2023)
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Solution
The determinant is \( 2*7 - 3*5 = 14 - 15 = -1 \).
Correct Answer: A — 1
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Q. What is the determinant of the matrix \( I = \begin{pmatrix} 4 & 2 \\ 1 & 3 \end{pmatrix} \)? (2021)
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Solution
The determinant is \( 4*3 - 2*1 = 12 - 2 = 10 \).
Correct Answer: A — 10
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