Free Class-X-Chemistry Mock Test -Semister-1

All About Chemistry3 years ago3 years ago01 mins

1.Identify the most electronegative element among the following Cl Mg K Si

2. Elements A, B and C have atomic number 11, 6 and 17 respectively. The nature of bond between- A and C, B and C, C and C are respectively- Ionic, Covalent, Covalent Ionic, Ionic, Covalent Covalent, Ionic, Covalent All Covalent

3. An element(A) belonging to group 15 and 2nd period . This element when combine with hydrogen forms a compound with ______ covalent bonds _______ lone pair electrons. 2, 3 3, 1 1, 3 2, 2

4. The % of oxygen in Na2CO3.10H2O is- [ Na= 23, C=12, O=16, H=1] 77.2% 22.7% 72.7% 27.7%

5. Calculate the % of C in anhydrous oxalic acid. (COOH)2 . [C=12, O=16, H=1] 26.67% 16.67% 36.67% 66.67%

6. Calculate the empirical weight of CH3CH2CH2CH2-O-O-H. [C=12, H=1, O=16] 50 45 30 35

7. A compound produces a pungent smelling gas when heated with ammonium salt. The expected pH of the compound is 2 7 10 6

8.The ion which is selectively discharged at the anode among the following Cl- SO4 2- OH- Br-

9.The compound which will not furnish any ions when dissolved in water carbon tetrachloride sodium nitrate ammonium chlorided formic acid

10. The purpose of using sulphuric acid during electrolysis of water Volatile Reducing Non volatile Oxidising

11.The entity which possess a coordinate bond bicarbonate ion chloride ion oxalate ion ammonium ion

12. The colour of the fumes produced at the anode when molten lead bromide is subjected to electrolysis Colourless Yellow Reddish brown Black

13. The type of salt formed by acetic acid Only acid salt Only normal salt One acid salt + one normal slat Basic salt

14. The electrolyte taken during the electroplating of silver Silver nitrate Silver chloride Sodium argentocyanide Silver iodide

15. The compound which can pass electricity in aqueous state. cuprous chloride carbon tetrachloride methane ethanol

16. When CuSO4 solution is electrolysed using Pt electrode, the observation seen are- Reddish brown deposit at cathode, Blue colour of the solution fades. Pale blue deposit at cathode, Blue colour of the solution remain same Reddish brown deposit at cathode, Blue colour of the solution remain same Pale blue deposit at cathode, Blue colour of the solution fades.

17.The cathode used, anode used, cathode reaction and anode reaction during the electroplating of an article with nickel are- Block of pure nickel metal, Article to be electroplated, Ni - 2e- = Ni2+, Ni2++2e-= Ni Article to be electroplated, block of pure nickel metal, Ni - 2e- = Ni2+, Ni2++2e-= Ni Article to be electroplated, block of pure nickel metal, Ni2++2e-= Ni, Ni - 2e- = Ni2+ Block of pure nickel metal, Article to be electroplated, Ni2++2e-= Ni, Ni - 2e- = Ni2+

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