MCQs Preparation

When catalyst and reactants are present in same phase, catalyst is called:

A. Homogenous catalyst
B. Heterogeneous
C. Organic catalyst
D. None of the above

A. Homogenous catalyst

In chemistry, when a catalyst is present in the same phase (gas or liquid) as the reactants, it’s called a homogeneous catalyst. Heterogeneous catalysts, on the other hand, are in a different phase than the reactants.

When catalyst and reactants are present in same phase, catalyst is called: Read More »

Which of the following system is equilibrium?

A. An open pan of water is boiling on stove while temperature of water is constant.
B. Water is freezing in an open ice box. Temperature of water is constant.
C. An anti-bill follows its daily b/c. The population of anti-bill is constant
D. Balloon contains air and few drops of water, the pressure in ballon is constant.

C. An anti-bill follows its daily b/c. The population of anti-bill is constant

Which of the following system is equilibrium? Read More »

How many moles of sulphur are there in 64 grams of the element?

A. 1
B. 2
C. 3
D. 4

B. 2

Here’s how we can find the number of moles:

  1. Molar mass of Sulphur (S): 32 grams per mole (g/mol)
  2. Given mass of Sulphur: 64 grams (g)

Formula:

Number of moles (mol) = Mass (g) / Molar mass (g/mol)

Calculation:

Number of moles (mol) = 64 g / 32 g/mol = 2 mol

Therefore, there are 2 moles of sulphur in 64 grams of the element.

How many moles of sulphur are there in 64 grams of the element? Read More »

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