JEE Main Chemistry Practice Questions and Answers

1. Metal that can not be obtained by the electrolysis of its aqueous solution is
1) silver 2) copper 3) gold 4) potassium

2. The reaction between potassium and nitrogen produces
A. K3N B. KN3 C. KNO2 D. KNO3
1) A only 2) B only 3) a mixture of C and D 4) none of these

3. A solution of common salt containing dissolved carbon dioxide is saturated with ammonia. The product obtained is
1) (NH4)2 CO3 2) Na2 CO3 3) NH4 HCO3 4) NaHCO3

4. Which of the following hydroxide has low solubility product in aqueous solutions
1) NaOH 2) Mg(OH)2 3) KOH 4) Ca(OH)2

5. Magnesium cannot be obtained by chemical reduction using carbon. This is because
1) Carbon is more electropositive than magnesium
2) Carbon is a very weak reducing agent
3) Carbon reacts with magnesium to form carbides
4) Carbon does not react with magnesium

6. MgCl2.6H2O on heating forms ‘X’ and finally transforms to ‘Y’ on strong heating. ‘X’ and ‘Y’ are respectively
1) Mg(OH)Cl, MgO 2) MgO, Mg(OH)2
3) MgO, Mg(OH)Cl 4) Mg(OH)2, Mg(OH)Cl

7. Assertion(A): Mg2+ ions are precipitated by adding NH4OH in the presence of NH4Cl Reason(R): Mg(OH)2 is less soluble in water
1) A and R are true, R properly explain A
2) A and R are true, R does not explain A
3) A is true, but R is false
4) A is false, but R is true

8. Anhydrous aluminium chloride is covalent. But it is dissolved in water and hydrated ions are formed. This is due to the fact that
1) aluminium is trivalent
2) water is polar
3) lattice energy is high with Al3+
4) hydration energy is high with Al3+

9. The distance between two adjacent carbon atoms is graphite is ‘x’pm and between two adjacent layers is ‘y’pm. The ratio of ‘x’ and
‘y’ is about
1) 1 : 1 2) 2 : 5 3) 2 : 1 4) 4 : 5

10. Read the following statements :
(A) CCl4 does not undergo hydrolysis
(B) Carbon is easily attacked by fluorine
(C) PbCl4 is a good oxidising agent
(D) Carborandum is a covalent solid Number of correct statement in the above list is
1) only 1 2) two 3) three 4) all

11. Carbon dioxide Silicon dioxide
1. Gas at room 1. Solid at room temperature temperature
2. Has sp hybridisation 2. Has sp3 of central atom hybridisation of
central atom
3. Has only double 3. Has only single bond bond
4. Molecular formula 4. Molecular is CO2 formula is SiO2
Wrong in the differences of the table is
1) 1 2) 2 3) 3 4) 4

12. Acid used for making permanent marking on the glass surface is
1) HF 2) HNO3 3) H2SO4 4) HClO4

13. Number of ‘O’ atoms around ‘N’ of N2O3 and N2O5 are n1 and n2.
Number of ‘O’ atoms around ‘P’ of P4O6 and P4O10 are n3 and n4.
These numbers are respectively
1) 2, 3, 4 and 5 2) 2, 3, 3 and 4
3) 1, 2, 3 and 4 4) 3, 5, 6 and 10

14. Correct order of volatility of hydrides of group 15 elements is
1) NH3 > PH3 > AsH3 > SbH3
2) PH3 > AsH3 > SbH3 > NH3
3) PH3 > AsH3 > NH3 > SbH3
4) PH3 > NH3 > AsH3 > SbH3

15. Gas ‘A’ is passed through water to form a saturated solution. This solution gives a white precipitate with silver nitrate. This solution dissolves magnesium, liberating a colourless gas ‘B’. ‘A’ and ‘B’ are respectively
1) Cl2, CO2
2) Cl2, H2
3) CO2, Cl2
4) H2, Cl2

16. A mixture of noble gases can be separated by
1) adsorption and desorption of charcoal
2) liquification process
3) electrolysis of their molten fluorides
4) reaction with steam

17. Super phosphate of lime contains the pair of ions
1) SO2-4 , HPO2-4 2) HSO-4 , HPO-4 3) SO2-4, H2PO-4 4) HSO-4, PO3-4

18. Which of the following is same for H2 and D2
1) bond length 2) bond energy
3) rate of diffusion 4) rate of reaction

19. Regarding chromium peroxide CrO5, which of the following is false
1) oxidation state of Cr is +10
2) it is blue coloured
3) it has two peroxy bonds
4) it is stable in ether

20. ‘X’ is a colourless oxide of nitrogen which on exposure to air gives brown coloured ‘Y’. If ‘X’ and ‘Y’ are both gases at room
temperature, their nature
1) X is paramagnetic and Y is diamagnetic
2) Y is paramagnetic and X is diamagnetic
3) both X and Y are diamagnetic
4) both X and Y are paramagnetic

21. Structure of XeF4 molecule and bond angle are respectively
1) tetrahedral, 109.5o 2) trigonal, 120o
3) square planar, 90o 4) octahedral, 90o

22. Oxyacid of sulphur that has persulpide linkage
1) H2SO3 2) H2SO4 3) H2S2O7 4) H2S3O6

23. Aqueous solution of which of the following acts as bleaching agent
1) NCl3 2) PCl3 3) NF3 4) PCl5

KEY
1)4 2)4 3)1 4)2 5)3 6)1 7)4 8)4 9)2 10)4 11)4 12)1 13)2 14)3 15)2 16)1 17)3 18)1 19)1 20)4 21)3 22)4 23)1

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