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Chemistry CBSE Medical Test - 1

A test by Muggu.

Test Questions

Question

How many moles of electrons weight one kilogram?

Answers

Correct	Answer Text
	$\frac {1}{9.108 \quad 6.023}*10^8$
	$\frac {6.023}{9.108}10^{24}$
	$6.03*10^{23}$
	$\frac {1}{9.10^8}10^{21}$

Question

Two flasks X and Y have capacity 1L and 2L respectively and each of them contain 1 mole of gas. The temperature of the flasks are so adjusted that average speed of molecules in X is twice as there in Y. The pressure in flask X would be

Answers

Correct	Answer Text
	Half of that in Y
	8 times of that in Y
	Same as that in Y
	Twice of that in Y

Question

Match list -1 list -II and select the correct answer

Answers

Correct	Answer Text
	A-4, B-5, C-2, D-3
	A-1, B-5, C-4, D-3
	A-5, B-1, C-3, D-4
	A-1, B-2, C-4, D-5

Question

Given $NH_{3(g)} \quad 3Cl_{2(g)} \rightarrow NCl_3 \quad 3HCl_{(g)}, \quad H_1$
$N_{2(g)} \quad 3H_{2(g)} \quad 2NH_{3(g)}, H_2$
$H_{2(g)} \quad Cl_{2(g)} \quad 2HCL, H_3$
The heat of formation on $NCl_{3(g)}$ in terms of $\Delta H_1, \Delta H_2 \quad and \quad \Delta H_3$ is

Answers

Correct	Answer Text
	$\Delta H_f=\Delta H_1-\frac {H_2}{2} \quad \frac {3}{2} \quad H_3$
	None of these
	$\Delta H_f = \Delta H_1+\frac {H_2}{2} \quad \frac {3}{2} \quad H_3$
	$\Delta H_f=-\Delta H_1-\frac {H_2}{2} \quad \frac {3}{2} \quad H_3$

Question

Consider the general hypothetical reaction $A_{(s)}\leftrightharpoons 2B_{(g)}+3C_{(g)}$
If the concentration of C at equilibrium is doubled then after the equilibrium is re-established the concentration of B will be

Answers

Correct	Answer Text
	One half of the original value
	$2\sqrt {2}$ times of the original value
	$\frac {1}{2\sqrt {2}}$ time of original value
	Two times the original value

Question

At a certain temperature the dissociation constants of formic acid and acetic acid are $1.8*10^{-4} \quad and \quad 1.8*10^{-5}$ respectively. The concentration of acetic acid solution in which the hydrogen ion has the same concentration as in 0.001 M formic acid solution equal to

Answers

Correct	Answer Text
	0.001 M
	0.01 M
	0.0001 M
	0.1 M

Question

When copper is heated with a certain concentration of nitric acid, nitric oxide, nitrogen dioxide are liberated in equal volumes according to the equation
$xCu+yHNO_3\rightarrow Cu(NO_3)_2+NO+NO_2+H_2O$
The coefficient x and y are

Answers

Correct	Answer Text
	2 and 3
	2 and 6
	3 and 8
	1 and 3

Question

When sulphur is dissolved in oleum a deep solution containing polyatomic sulphur cation is obtained. The formula of the cation present is -

Answers

Correct	Answer Text
	$S_{18}^{2+}$
	$S_{19}^{2+}$
	$S_8^{2+}$
	$S_4^{2+}$

Question

The most stable corbocation is-

Answers

Correct	Answer Text

Question

At high temperature the compound S_4N_4 decomposes completely into N_2 and sulphur vapour. If all measurements are made under the same conditions of temperature and pressure it is found that for each volume of S_4N_4 decomposed 2.5 volume of gaseous products are formed. Molecular formala of sulphur is

Answers