Chemistry Mart Sem 1 set A

How many protons, electrons and neutrons are there in an ion of chlorine isotope

• 35p, 35e, 17n

• 35p, 17e, 18n

• 17p, 35e, 17n

• 17p, 18e, 18n

The p_x, p_y, p_z, orbitals of the same quantum number differ in...

• shape

• energy

• spatial orientation

• size

All of the following orbitals are allowed , EXCEPT

• 7s

• 2d

• 4f

• 6f

The forces of attraction between hydrogen molecules are

• Covalent bonds

• London forces

• Hydrogen bonds

• London forces

The molecule BF₃ is an example of a molecule that

• obeys the octet rule.

• has and incomplete octet.

• has an expanded octet.

• has odd number of electrons.

Based on the phase diagram of pure substance X, choose the correct statement

• S is critical point of X

• Solid X and gas X exist in equilibrium at point T

• The density solid X is higher than liquid X

• The curve QR is refer to solid and liquid exist in equilibrium

The following reaction is exothermic.

3NO(g) ⇌ N₂O(g) + NO₂(g)

Predict what will happen if the temperature is increased.

• K_C will increase

• More NO₂ will be produced

• The equilibrium position will shift to the left

• More NO will be consumed

Which of the following salts forms an aqueous solution with the lowest pH?

• NH₄NO₃

• Ca(NO₃)₂

• KNO₃

• Mg(NO₃)₂

Element Q has the following electronic configuration: 1s² 2s² 2p⁴

• Q is an element of group 6

• Q has the oxidation of -2

• Q combines with an alkaline metal, M to form M₂Q

The table shows the Van Der Waals constant for water and sulphur dioxide

We can conclude that

• H₂O molecule are smaller and less attracted to each other than SO₂

• H₂O molecule are smaller and more attracted to each other than SO₂

• H₂O molecule are larger and more attracted to each other than SO₂