Explore topic-wise InterviewSolutions in .

Describe giving all practical details, how would you prepare :

(a) copper sulphate crystals from a mixture of charcoal and black copper oxide,

(b) zinc sulphate crystals from zinc dust (powdered zinc and zinc oxide),

(c) sodium hydrogen carbonate crystals.

(d) Calcium sulphate from calcium carbonate.

What is Antimatter

Continuing the inheritance story from the where we left – now the ore is concentrated. What would you do next with the now concentrated and dried ore?

Which one is the formula of formaldehyde?

Metal A has electronic configuration of 2, 8, 1 and metal B has 2, 8, 8, 2 which is more reactive. Identify these metals and give their reactions with dil HCl.

Draw electron dot structures for each of the following:

(a) MgCl₂

(b) CaO

(c) NaCl

(i)What is aqua regia?

(ii)Give any two uses of aqua regia.

What remains in the petri dish if a mixture of salt, sand and water is heated?

Question 15
Explain the mechanism of cleansing action of soaps.

Which feature of ammonia leads to the formation of ammonium ion when dissolved in water?

Which of the following reaction will provide maximum voltage?

Given:

$Z{n}^{2+}\left(aq\right)+2e^{-}\to Zn\left(s\right);E^0=-0.76V$

$C{u}^{2+}\left(aq\right)+2e^{-}\to Cu\left(s\right);E^0=0.34V$

$A{g}^{+}\left(aq\right)+e^{-}\to Ag\left(s\right);E^0=0.80V$

$2H^{+}\left(aq\right)+2e^{-}\to H_2\left(g\right);E^0=0V$

$N{i}^{2+}\left(aq\right)+2e^{-}\to Ni\left(s\right);E^0=-0.25V$

An electrophile is:

(a) What happens when a piece of iron metal is placed in copper sulphate solution ? Name the type of reaction involved.

(b) Write balanced chemical equation with state symbols for the following reaction:

Barium chloride solution reacts with sodium sulphate solution to give insoluble barium sulphate and a solution of sodium chloride.

How does electronic configuration of atoms change in a period with increase in atomic number? [2 MARKS]

Sulphuric acid is used in the manufacture of other acids due to its :

Question 3

Find out, from the table, the medium having highest optical density. Also, find the medium with lowest optical density.



$\begin{array}{cccc}Materialmedium& Refractiveindex& Materialmedium& Refractiveindex\\ Air& 1.0003& CanadaBalsam& 1.53\\ Ice& 1.31& -& -\\ Water& 1.33& Rocksalt& 1.54\\ Alcohol& 1.36& -& -\\ Kerosene& 1.44& Carbondisulphide& 1.63\\ Fusedquartz& 1.46& Denseflintglass& 1.65\\ Turpentineoil& 1.47& Ruby& 1.71\\ Benzene& 1.50& Sapphire& 1.77\\ Crownglass& 1.52& Diamond& 2.42\end{array}$

If velocity of an electron in I orbit of H atom is V, what will be the velocity of electron in $3^{rd}$ orbit of $L{i}^{2+}$:

What are the various steps in a food chain called?