+2 - Chemistry - Important one mark questions -Third Set - Part 1

Third set of objective type questions for Chemistry syllabus is provided below.

1. Among the following ------------ is a paramagnetic

(a)    O₂                      (b)     CN                        (c) CO                  (d)     NO⁺

2. According to planks quantum theory--------------

(a) E=mc²               (b) E=hν                 (c) λ=                     (d) K.E=mc²/2

3. The least magnetic stable element in the periodic table is

(a) Lithium            (b) Cesium             (c) Iodine               (d) Flourine

4. Pcl₃ on hydrolysis gives

(a) HPO₃                (b) H₃PO₄               (c) H₃PO₂                (d) H₃PO₃

5. Excess of NaOH reacts with Zn to form

(a) ZnH₂                 (b) Na₂ZnO₂            (c) ZnO                  (d) Zn(OH)₂

6. The number of unpaired electrons in Fe³⁺ ion is

(a) 2                      (b) 3                      (c) 4                      (d) 5

7. The strongest base among the following is

  (a) Sc(OH)₃           (b) La(OH)₃            (c) Lu(OH)₃             (d) yb(OH)₃