BPSC Chemistry Lecturer Past Papers

The cholesteryl - benzoate is?

1. An example of colloidal solution
2. An example of liquid crystal
3. An example of immiscible solution
4. A constituent of buffer solution

‘He’ gas effuse from a hole of 10 dm^3 vessel in “5” seconds. The time for effusion of O2 from the same hole of 10 dm^3 will be?

1. 4 seconds
2. 12 seconds
3. 14.1 seconds
4. 10 seconds

Which of the following molecule is polar and its dipole moment is 5.33 x 10^-30 Cm?

1. CO2
2. SO2
3. CCl4
4. CH4

The co-ordination number and oxidation state of Cobalt in the given complex Na4[Co(C2O4)3] are respectively?

1. 6 and +3
2. 3 and +2
3. 3 and +4
4. 3 and +5

The metal ions of transition metals are paramagnetic. The magnetic moment towards magnetic field is greatest of?

1. Fe^+2
2. Fe^+3
3. Co^+2
4. Cr^+3

The F-S-F bond angles in SF6 are?

1. 109°28
2. 120° only
3. 90°
4. 90° and 180°

In a process at constant volume ΔE =_____?

1. ΔH
2. ΔT
3. q
4. ΔV

Which one of the following statements about the mass spectrum of CH3Br is correct?

1. Last two peaks are of equal size at m/z values of 94 and 96
2. Last two peaks are in the ratio of 3:1 at m/z value of 94 and 96
3. Just one peak for molecular ion at m/z values of 95
4. Just one peak for molecular ion at m/z value of 44

Magnetic susceptibility (χ) measures on?

1. Guoy balance
2. Analytical balance
3. Faraday balance
4. Both A and C

Natural rubber consists of polymers of the organic compound?

1. Isoprene
2. Alkaloid
3. Terpene
4. None