Following are model questions with key for JEE Main – Inorganic Chemistry. The Chemistry is an highly important for JEE Main candidates. Here we are giving some model / practice questions along with Key / Answers:
1. Halogen that is naturally available even in positive oxidation numbers is
1) fluorine 2) chlorine 3) bromine 4) iodine
2. The ring of cyclic trimer of sulphur trioxide contains
1) 3 atoms 2) 5 atoms 3) 6 atoms 4) 8 atoms
3. Number of delocalised pi electrons in chlorate ion is
1) 2 2) 3 3) 4 4) 6
4. The formation of ozone in a ozonser is favoured from oxygen theoretically at
1) high temperature and high pressure
2) low temperature and high pressure
3) low temperature and low pressure
4) high temperature and low pressure
5. Number of atoms of diborane in the formation of both the banana bonds is
1) 3 2) 4 3) 6 4) 8
6. Which of the following is a double salt
A. Potash alum B. Mohr’s salt
C. Carnallite D. Cuprammonium sulphate
1) B, D 2) A, C, D 3) A, B, C 4) A, B, C, D
7. Fusion of chromite ore with sodium carbonate and oxygen gives
1) sodium chromate 2) sodium dichromate
3) chromyl chloride 4) chromic oxide
8. Consequences of lanthanide contraction are
A) Elements of 4f are difficult to separate
B) Zr and Hf have almost same size
C) Hg has higher ionisation energy than that or Cd
1) A and B only 2) A and C only
3) B and C only 4) A, B and C
9. Regarding transition elements, a false statements is
1) they exhibit variable oxidation states
2) their compounds are all paramagnetic
3) they are familiar to form alloys
4) their presence in reactions proved an increase in rates
10. Assertion (A): AgCl and AgI are separated using ammonia
Reason (R): Ammonia molecule has a lone pair and acts as a ligand
1) Both A and R are true, R properly explains A
2) Both 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
11. Incorrect regarding manganate and permanganate
1) both can act as oxidants
2) both have same colour
3) both are isostructural
4) both have same bond angles
12. 10 grams of magnalium an treating with aqueous caustic soda liberated H2, which occupies 11.2 lit at STP. The mass percentage of magnesium in the alloy is about
1) 2% 2) 10% 3) 24% 4) 80%
13. Which of the following pairs represent ores of the same metal
1) Sphelerite, Cinnabar 2) Siderite, Hematite
3) Limonite, Bauxite 4) Magnetite, Galena
14. Assertion (A): Mercury can be stored in bottles made up of iron
Reason (R): Iron does not form inter metallic compound with mercury
1) Both R and A are true, R properly explains A
2) Both R and A are true, R does not explain A
3) A is true, but R is false
4) A is false, but R is true
15. Read the following statements
I Silver is usually extracted by hydrometallurgy
II Iron is usually obtained by pyrometallurgy
III Mercury is obtained by thermal reduction of sulphide
IV Potassium is obtained by electrolytic reduction of fused chloride
Number of statements that are correct is
1) 1 2) 2 3) 3 4) 4
16. In aluminothermic process, the ratio of moles of ferric oxide and reducing agent is
1) 3 : 1 2) 1 : 3 3) 2 : 1 4) 1 : 2
17. Increasing order of the mass percentage of copper in the following alloys is
A) Deverda alloy B) Bell metal
C) Duralumin D) Aluminium bronze
1) A < B < C < D 2) D < C < B < A
3) C < D < A < B 4) B < A < D < C
KEY: 1-4; 2-3; 3-3; 4-2; 5-2; 6-3; 7-1; 8-4; 9-2; 10-2; 11-2; 12-2; 13-2; 14-1; 15-4; 16-4; 17-3.