NEET INTRODUCTORY TEST SERIES 8 CHEMISTRY

1. The group number, number of valence electrons, and valency of an element with atomic number 32, respectively, are

(a) 11, 2, 3
(b) 14, 4, 4
(c) 12, 3, 4
(d) 13, 3, 4

2. Which of the following is incorrect from the following

(a) Unp – Db               
(b) Uuu – Rg
(c) Uuo – Ts    
(d) Unn – Fm

3. The correct order of ionic radius are

a) K⁺ > Na > Mg ²⁺
b) Na > Na⁺ > Ca ²⁺
c) O^– < O ^2- < O
d) N^3- > F^– < F

4. Which one of the following group of atoms or ions is not iso-electronics ?

a) Na⁺, Mg²⁺, Al³⁺
b) Ne, Na⁺, Al³⁺
c) He, H^–, Li ⁺
d) K⁺, Ca²⁺, Ne

5. In which of the following options the order of arrangement does not agree with the variation of property indicated against it?

(a) B < C O (Ionization Enthalpy)
(b) Li < Na < K < Rb (Metallic Character)
(c) O < O- < O2- (Ionic Size)
(d) F < Cl < Br < I (Electron Gain Enthalpy)

6. Assertion : Mendeleev’s left the gap under aluminium and silicon and called these Eka aluminium and Eka – silicon, respectively.
     Reason : Dobereiner arranged elements on the basis of increasing atomic number.

(a) If both assertion and reason are true and reason is the correct explanation of assertion.
(b) If both assertion and reason are true but reason is not the correct explanation of assertion.
(c) If assertion is true but reason is false.
(d) If both assertion and reason are false.

7. The IUPAC symbol for the element Nobelium is

a) Uno
b) Uue
c) Unb
d) Uns

8. Choose the incorrect order among the following :

a) Li₂O < Na₂O < K₂O (Basicity)
b) Al₂O₃ < SiO₂ < P₂O₅ (Acidity)
c) B₂O₃ < Al₂O₃ < Ga₂O₃ < In₂O₃ (Acidity)
d) P₂O₅ > SO₃ > Cl₂O₇ (Basicity)

9. Which one of the following processes proceeds with the absorption of energy ?

a) Cl + e^– → Cl-
b) F + e^– → F-
c) O^– + e^– → O^2-
d)  O + e^– → O-

10. Which of the following statements are not correct ?

a) Gallium wes earlier called eka –aluminium
b) 4^th period begins with Rubidium
c) 14 elements of 6^th period are called Lanthanoids
d) Henry Moseley discovered the relationship between X-ray spectra and atomic number of the elements.

11. At 25 ºC the vapour pressure of methyl alcohol is 96.0 torr. What is the mole fraction of CH₃OH in a solution in which the partial vapour pressure of CH₃OH is 23.0 torr at 25 ºC!

(a) 0.5
(b) 0.32
(c) 0.15 
(d) 0.24

12. The vapour pressures of ethanol and methanol are 44.5 mm and 88.7 mm Hg respectively. An ideal solution is formed at the same temperature by mixing 60 g of ethanol with 40 g of methanol Calculate the mole fraction of methanol in the vapour.

(a) 0.55
(b) 0.65
(c) 0.35
(d) 0.25

13. A solution of sulphuric acid in water exhibits

(a) negative deviation from Raoult’s law
(b) positive deviation from Raoult’s law
(c) ideal properties
(d) the applicability of Henry’s law.

14. 15 g of methyl alcohol is dissolved in 35 g of water. What is the mass percentage of methyl alcohol in solution?

(a) 30%
(b) 50%
(c) 70%
(d) 75%

15. The molarity of 20% (w/w) solution of sulphuric acid is 2.55 M. The density of the solution is

(a) 1.25 g cm³ 
(b) 0.125 g L^-1
(c) 2.55 g cm³
(d) unpredictable.

16. Solubility curve of Na₂SO₄10H₂O in water with temperature is given as in the figure, we can say that


a) solution process is exothermic
b) solution process is exothermic till 34 d ºC and endothermic after 34 ºC
c) solution process is endothermic till 34 ºC and exothermic thereafter
d) solution process is endothermic.

17. The vapour pressure of pure liquid A at 310°C is 120 torr. The vapour pressure of this liquid in solution with liquid B is 72 torr. Calculate the mole fraction of A in solution if the mixture obeys Raoult’s law.

(a) 0.06
(b) 0.9
(c) 0.3
(d) 0.6

18. The diagram given below is a vapour pressure composition diagram for a binary solution of A and B.


In the solution, A – B interactions are
(a) similar to A – A and B – B interactions
(b) greater than A – A and B – B interactions
(c) smaller than A – A and B – B interactions
(d) unpredictable.