﻿ The amount of BaSO4 precipitated on mixing BaCl2 (0.5 M) with H2S

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# 1.The amount of BaSO4 precipitated on mixing BaCl2 (0.5 M) with H2SO4 (1 M) will correspond to0.5 M 1.0 M 1.5 M 2.0 M

A.

0.5 M

[Ba2+] = 0.5 mol L-1

[S${\mathrm{O}}_{4}^{2-}$] = 1mol L-1

Ba2+ (aq) + S${\mathrm{O}}_{4}^{2-}$ (aq) $⇌$ BaSO4 (s)

0.5 mol of Ba2+ would react with 0.5 mol of S${\mathrm{O}}_{4}^{2-}$ ions to form 0.5 mol of BaSO4.

2.

One mole of SO3 was placed in a vessel of 1 L capacity at a certain temperature and the following equilibrium was established.

2SO3 (g) $⇌$ 2SO2 (g) + O2 (g)

If 0.6 moles of SO2 were formed at equilibrium, Kc for the reaction will be

• 0.036

• 0.45

• 0.54

• 0.675

3.

$\mathrm{\alpha }$-particles can be detected by using

• thin aluminium sheet

• barium sulphate

• zinc sulphide screen

• gold foil

4.

The pair of amphoteric hydroxides is

• Be(OH)2, Al(OH)3

• Al(OH)3, LiOH

• B(OH)3, Be(OH)2

• Be(OH)2, Mg(OH)2

5.

For the reaction of one mole of zinc dust with one mole of sulphuric acid in a bomb calorimeter, $∆$U and w correspond to

• $∆$U < 0, w = 0

• $∆$U < 0, w < 0

• $∆$U > 0, w = 0

• $∆$U > 0, w > 0

6.

In a decay process ${}_{\mathrm{Z}}{}^{\mathrm{A}}\mathrm{X}$ changes into ${}_{\mathrm{Z}-1}{}^{\mathrm{A}}\mathrm{Y}$. Which process is this?

• $\mathrm{\beta }$-decay

• ${\mathrm{\beta }}^{+}$ decay

• $\mathrm{\alpha }$- decay

• $\mathrm{\gamma }$- decay.

7.

Which of the following arrangement is possible?

•  n l m s 5 2 2 +1/2
•  2 2 0 -1/2
•  3 -2 1 +1/2
•  0 0 1 +1/2

8.

How many significant figures are present in 0.0000135?

• 7

• 8

• 4

• 3

9.

Assertion : Molecular nitrogen is less reactive than molecular oxygen.

Reason: The bond length of N2 is shorter than that of oxygen.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

10.

Assertion : NF3 is a weaker ligand than N(CH3)3.

Reason : NF3 ionizes to give F- ions in aqueous solution.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.