Which of the following are isoelectronic species ?

Related Mcqs:

1. Which of the following set has all species isoelectronic__________________?

   A. F – Cl – Br
   B. Li+1 – Na+1 – K+1
   C. F – Ne – Na+
   D. H+ – H- – H

2. Which one of the following species is not an electrophile ?

   A. NH3
   B. Br+
   C. H+
   D. BF3

3. The species which donate two electron pairs in a coordination compound is called__________________?

   A. ligand
   B. mono-dentate ligand
   C. poly-dentate ligand
   D. bi-dentate ligand

4. In an electrolysis of aqueous Sodium Flouride, the species that moves towards Anode is _________?

   A. Flouride
   B. Sodium
   C. H²O
   D. None of them

   Submitted by: Aamir khan Hullio

5. Species are formed in one step of reaction mechanism and used up in another step are called:

   A. Catalyst
   B. Intermediate
   C. inhibitor
   D. activated complex

   Submitted by: Said wali shah

6. When benzene is substituted by halogens only which one of the following halogens only which one of the following halogens is given the number one position in the ring while writing the name of compound ?

   A. Bromine
   B. Chlorine
   C. Fluorine
   D. Iodine

7. Which of the following statements about isotopes is correct ?

   A. Isotopes with odd atomic number are abundant
   B. Isotopes with odd atomic number and even mass number are abundant
   C. Isotopes with even atomic number and even mass number are abundant
   D. Isotopes with even atomic number and odd mass no are abundant

8. Which of the following ion formation is always exothermic ?

   A. Uni-negative
   B. Uni-positive
   C. Di-negative
   D. Di-positive

9. As a substance moves from a solid to a liquid all of the following changes occur except ?

   A. molecules become more disordered.
   B. K.E of the molecules decreases
   C. intermolecular forces become weaker.
   D. molecules move more frequently.

10. In the van der Waals equation (P + n2a / v2) (v – nb) = nRT which of the following statement is not true ?

    A. n2a/v correct for the intermolecular forces.
    B. nb correct for the volume occupied by gas molecules.
    C. at high densities the equation reduces to the ideal gas law
    D. all of the above statements are correct.