Chemical Kineti...

The incorrect statement is:

A first order reaction has a rate constant $$1.5\times10^{-3}\:sec^{-1}$$. How long will 5.0 g of this reactant take to reduce to 1.25 g.

In a zero order reaction half life is 100 sec. After how much time 78 fraction of reactant will be reacted?

The rate constant for a zero order reaction is $$2\times10^{-2}\:mol\:L^{-1}\:sec^{-1}$$, if the concentration of the ractant after $$25 sec$$ is $$0.25 M$$, calculate the initial concentration.

The half-life period of a first order reaction is $$15\: minute.$$ How much reaction will be completed in $$30\:minute$$?

In a first order reaction the concentration of reactant decreases from 800 $$mol/dm^3$$ to $$50 mol/dm^3$$ in $$2\times 10^4 sec$$. The rate constant of reaction in $$sec^{-1}$$ is:

A reaction which is of first order w.r.t reactant $$A$$, has a rate constant $$6$$ $${min}^{-1}$$. If we start with $$[A]=0.5mol$$ $${L}^{-1}$$, when would $$[A]$$ reach the value of $$0.05 mol$$ $${L}^{-1}$$?

For the reaction: $${H}_{2}+{Cl}_{2}\overset { sunlight }{ \longrightarrow}2HCl$$ the order of reaction is :

A mixture of 2 gases -A (reactive) and X (inert) is kept in a closed flask when A decomposes as per the following roaction at 500 k
$$\displaystyle A(g)\rightarrow 2B(g)\rightarrow 2B(g)+3C(\varphi )+4D(s)$$
$$\displaystyle P^{\circ}=210mm Hg$$
$$\displaystyle P_{t}(10\, mins)=330mm\, Hg$$
$$\displaystyle P_{\infty t}=430mm\, Hg$$
Vapour pressure of $$\displaystyle C(\varphi )$$ at 500 K is 20 mm Hg
Calculate the half-life of A ?

When sugar is stirred with a spoon in a glass of water, more sugar is dissolved and faster. Why?