Find Out What You Want: AIEEE Practice Questions On Chemistry.......

AIEEE Practice Questions On Chemistry.......

Tuesday, December 21, 2010

Some Practice Questions on Chemistry.. And Stay Tunes We are posting regulerly

For reaction , 80% A is decomposed in 1 hr. 96% is decomposed in 2 hrs. 99.2% is decomposed in 3 hrs. and 99.84% is decomposed in 4 hrs. What is the order of reaction?

Selected	Possible Answer
	first
	second
	zero
	can not be predicted

$A_{(solid)} \rightleftharpoons A_{(liquid)}- X Kcals.$ Volume of $A_{(solid)}>volume A_{(liquid)}$ . If pressure is increased to the system, then melting point of sulphur is

Selected	Possible Answer
	decreased
	at first increases then it decreases
	remains unchanged
	increased

For the reaction $: 2A+2B+C \rightarrow A_2B+BC$ the rate expression is, $rate \infty [A]^2[B]$ , rate constant is $3*10^{-2}L^2 mol^{-2} sec^{-1}$ . Relation between the initial concentration of the reactants are $A_0=B_0=\frac {1}{2}C_0=0.3 moles/litre$ . The rate of reaction after 25%C is converted into products is

Selected	Possible Answer
	$3.2*10^{-2}L^2 mol^{-2} sec^{-1}$
	0
	none of these
	$11.25*10^{-8}L^2 mol^{-2} sec^{-1}$

The value of Van Der Waal’s constant a for the gases and are 1.36, 1.39, 4.17 and 2.253 unit respectively. The gas which can be liquefied most easily is

Selected	Possible Answer

2 mol and 3 mol gas are allowed to react in a 20 L flask at 400 K and after complete conversion of into $NH_3 \quad 10 L \quad H_2O$ was added and temperature reduced to 300 K. Pressure of the gas after reaction is $: N_2+3H_2 \rightarrow 2NH_3$

Selected	Possible Answer
	3R x 300/10
	3R x 300/20
	R x 300/10
	R x 300/20

A G.M. counter is used to study the radio-active process. In the absence of radio-active substance A it counts 3 disintegration per second (dps). At the start in the presence of A it records 23 dps; and after 10 minutes 13 dps.

(1). What does it count after 20 minutes? (2). What is half-life of A?

Selected	Possible Answer
	8 dps, 10 min
	5 dps, 20 min
	5 dps, 10 min
	5 dps, 5 min

When $1*10^{-3}$ mole of the chloride of an element Y was completely hydrolyzed, it was found that the resulting solution requires 20 ml of 0.1 M aqueous silver nitrate for complete precipitation of chloride ion. Element Y could be

Selected	Possible Answer
	sulphur
	aluminium
	silicon
	phosphorus

If the ratio of co-ordination no. P to that of Q be Y : Z, then the formula of the solid is

Selected	Possible Answer


	$P_{1/y} Q_{1/z}$
	none

Allylic bromination of propane by NBS to form allyl bromide is a

Selected	Possible Answer
	free radical substitution reaction
	nucleophilic addition reaction
	electrophilic addition reaction
	free radical addition reaction

In the equation for expansion of work against atmosphere w = – P D V, which one (S) does P represent

Selected	Possible Answer
	all of the above
	pressure of the surroundings
	some constant pressure
	pressure of the system

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