Chemistry 1st Paper MCQ-(Combined All Board)-2018

1. $\mathrm{A}^{n+}+\mathrm{K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right] \rightarrow \text { precipitate }$

If the precipitate is red -

i. the element of $\mathrm{A}^{\mathrm{n}^{+}}$ion is transition clement

ii. it forms' complex compound having four co-ordination number

iii. it shows diamagnetic properties

Which one is correct?

2. Which of the following is used to measure the volume of solution accurately?

3. Octet incomplete compounds are-

i. $\mathrm{NH}_{3}$

ii. $\mathrm{BF}_{3}$

iii. $\mathrm{ALCl}_{3}$

Which one is correct?

4. Which one of the following produces highest heat of neutralization by the reaction with sodium hydroxide?

5. Which ion of the following forms coloured composund?