TS EAMCET 2017 :: Chemistry :: General questions

• Chemistry - General questions

Which of the following are the correct representations of a zero-order reaction. where A represents the reaction? 

Answer:

Explanation:

i,ii,iv

 In zero order R' n

   $t_{1/2}\propto \frac{[A]_{0}}{2K}$

Which of the following corresponds to the energy of the possible excited state of hydrogen?

Answer:

Explanation:

The different energy levels of an atoms  are given by the equation . $E_{n}=-13.6 Z^{2}/n^{2}eV$

Z is the atomic number of hydrogen =1

 n=1,2,3 and so on much that the ground state has n=1 and the secondary  energy level (first , excited state) has n=2

 So,  for first excited  state ,n=2

 E=-13.6 /2²=-13.6/4=-3.4eV

Heating a mixture of $Cu_{2}O$ and $Cu_{2}S$ will give 

Answer:

Explanation:

$2 Cu_{2}O+Cu_{2}S \rightarrow 6Cu+SO_{2}$

Cuprous sulphide brings about a reduction of cuprous oxide. This reaction takes place in the Bessemer converter during the metallurgy of copper.

The monomers of buna-S rubber are

Answer:

Explanation:

 The monomers present in buna-S rubber are

(i)1,3 butadiene

$ (CH_{2}=CH-CH=CH_{2})$

The bonding in diborane $[B_{2}H_{6}]$ can be described by

Answer:

Explanation:

Diborane molecular formula $B_{2}H_{6}$

Diborane has 4 two centre -two  electron $(2C-2e^{-})$ bonds and 2 three -centre -two electron $(3C-2e^{-})$ bonds

• Chemistry - General questions