CUET Questions — Chemistry

Q22. In the extraction of metallic Zn from calamine ore (ZnCO₃) following steps are involved: (A) Distillation of impure Zn (B) Calcination of the ore (C) Hydraulic washing of ore (D) Reduction of ZnO

Q18. Identify incorrect statement about H2 - O2 fuel cell from the following: (a) At cathode O2 is reduced to OH- (b) At anode H₂ is oxidized to form water (c) The cell runs continuously even if react

Q8. An analysis of iron oxide shows that its formula is Fe1.903. What percentages of iron exists as Fe3+ and Fe4+ ions: (a) Fe3+ = 82.98% and Fe++ = 17.02% (b) Fe3+ = 84.21% and Fe4+ = 15.79% (c) Fe3+

Q30. The isotope 19K42 has a half life of about 12 hours. What fraction of the initial concentration of 19K42 remains after 48 hours. (a) 1/4 (b) 1/8 (c) 1/12 (d) 1/16

Q45. The product (X) is: R-CH=CH-CHO + NH2-C-NH-NH2 → X (image of reaction: alpha,beta-unsaturated aldehyde + semicarbazide -> product X) (a) R-CH=CH-CH=CH-NH-NH2 (b) R-CH=CH-CH=N-C-NH-NH2 (c) R-CH2-C

Q37. The formation of micelle takes place only: (A) above a particular temperature called kraft temperature (B) above a particular concentration called critical micelle concentration (C) when catalyst

Q6. When dilute aqueous solution of KI (excess) is added to AgNO3 solution, the charge on the AgI colloidal, particles formed will be:

Q45. In hydrogen fuel cell, the reactants are bubbled through which electrodes?

Q50. Fehling Solution A and B respectively, are: (a) Alkaline solution of sodium potassium tartrate and alcoholic copper sulphate (b) Aqueous copper sulphate and alkaline solution off Rochelle salt (c

Q35. Which of the following pairs of transition metal ions is the strongest oxidizing agent?