Adding a suitable catalyst
Increasing the concentration of P
Increasing the temperature
Decreasing the temperature
Correct answer is C
No explanation has been provided for this answer.
Sulphur exists in six forms in the solid state. This property is known as
Isomerism
Allotropy
Isotopy
Isomorphism
Correct answer is B
No explanation has been provided for this answer.
25cm\(^3\)
10cm\(^3\)
20cm\(^3\)
50cm\(^3\)
Correct answer is D
Equation of reaction : 2NaOH + H\(_2\)SO\(_4\) → Na\(_2\)SO\(_4\) + 2H\(_2\)O
Concentration of a base, CB = 0.5M
Volume of acid, V\(_A\) = 10cm\(^3\)
Concentration of an acid, C\(_A\) = 1.25M
Volume of base, V\(_B\) = ?
Recall:
\(\frac{C_A V_A}{C_B V_B} = \frac{n_A}{n_B}\) ... (1)
N.B: From the equation,
\(\frac{n_A}{n_B} = \frac{1}{2}\)
From (1)
\(\frac{1.25 \times 10}{0.5 \times V_B} = \frac{1}{2}\)
\(\frac{12.5}{0.5V_B} = \frac{1}{2}\)
25 = 0.5V\(_B\)
VB = 50.0 cm\(^3\)
+5 to +3
+6 to +3
-2 to +3
+7 to +3
Correct answer is B
Cr\(_2\)O\(_7 ^{2-}\) + 6Fe\(^{2+}\) + 14H\(^{+}\) \(\to\) 2Cr\(^{3+}\) + 6Fe\(^{3+}\) + 7H\(_2\)O
The oxidation of Cr in Cr\(_2\)O\(_7 ^{2-}\) :
Let the oxidation of Cr = x;
2x + (-2 x 7) = -2 \(\implies\) 2x - 14 = -2
2x = 12 ; x = +6
Hence, the change in oxidation of Cr = +6 to +3
Which of the following pairs cannot be represented with a chemical formula?
air and bronze
bronze and sodium chloride
copper and sodium chloride
caustic soda and washing soda
Correct answer is A
No explanation has been provided for this answer.