Recent questions tagged p-block-elements

In the preparation of $H_2SO_4$ by contact process , why is $ SO_3$ hot absorbed directly in water to form $H_2SO_4$?

asked Nov 17, 2016 by meena.p

1 answer

Draw the structure of the following $a)H_2S_2O_8 \\ b)X_eO_3 \\ c) HOClO_2 $

asked Nov 15, 2016 by meena.p

1 answer

Complete the following reactions : (i) $P_4 +8SOCl_2 \to \\ (ii)\;I^{-}+O_3+H_2O \to $

asked Nov 15, 2016 by meena.p

2 answers

What happens when (i) Chorine gas is passed through a hot concentrated solution of $NaOH$? (ii) Sulphur dioxide gas is passed gas is passed through an aqueous solution of $Fe(III) $ salt ?

asked Nov 14, 2016 by meena.p

1 answer

Explain giving a suitable reason for each of the following : a)Transition metal and their compounds are generally found to be good catalysts. b) Transition metal and their compounds generally exhibit a para-magnetic behaviour .

asked Nov 11, 2016 by meena.p

1 answer

Explain why inspite of nearly the same electronegativity , oxygen forms hydrogen bonding while chloride does not

asked Nov 11, 2016 by meena.p

1 answer

p- Dichlorobenzene has higher melting point and lower solubility than o- and m- isomers Discuss.

asked Nov 7, 2016 by meena.p

1 answer

Explain giving a reason for each of the following situation : (i) In aqueous medium, HCl is stronger acid than HF (ii) White phosphorus is more reactive than red phosphorous.

asked Nov 4, 2016 by meena.p

1 answer

When Cons $H_2SO_4$ was added into an unknown salt present in a test tube, a brown gas (A) was evolved . This gas intensified when copper turnings were also added into this test tube . On cooling , the gas (A) changed into a colourless gas (B) (a) identify the gases A and B.

asked Nov 3, 2016 by meena.p

1 answer

Calculate the number of unpaired electrons in the following gaseous ions : $(i)Mn^{3+} (ii) Cr^{3+} (iii) V^{3+} (iv) Ti ^{3+} $ Which one of these is most stable in aqueous solutions ?

asked Nov 1, 2016 by meena.p

1 answer

How many Isomers are there for octahedral complex $[COCl_2(en)(NH_3)_2]^+$

asked Oct 31, 2016 by meena.p

1 answer

What is meant by disproportionation of an oxidation state ? Give an example

asked Oct 27, 2016 by meena.p

1 answer

Give the reasons for the following : (a) $CN^{-}$ ions is known but $CP^{-} $ ion is not known (b) $NO_2$ dimerizes to form $N_2O_4$ (c) $ICI$ is more reactive that $I_2$

asked Oct 27, 2016 by meena.p

1 answer

Predict which of the following will be colourless in aqueous solution ? $Ti^{3+},V^{3+},Sc^{3+},Mn^{2+},Fe^{3+},Co^{2+}$ and $MnO_4^{-}$

asked Oct 26, 2016 by meena.p

1 answer

Draw the structure of $BrF_3$ molecule

asked Oct 24, 2016 by meena.p

1 answer

Out of $H_2O$ and $H_2S$ which one has higher, bond angle ?

asked Oct 21, 2016 by meena.p

1 answer

(a) Give one reaction of D- glucose which cannot be explained by its open chain structure . (b)Give one example each for essential and non essential amino acids (c) Differentiate between keratin and insulin .

asked Oct 20, 2016 by meena.p

1 answer

Complete the following reactions: $(i) X_eF_6 +H_2O \to$ _+ ___ $\\ (ii) X_eF_6 +H_2O \to$ _ + ___ $ \\ (iii) Cl_2+H_2O \to$ _ + ___

asked Oct 13, 2016 by meena.p

1 answer

Using the following information determine the boiling point of a mixture contains $1560$ gm benzene and $1125\; gm$ chlorobenzene, when the external pressure is $1000\; torr$ Assume the solution is ideal.Given : Molar mass of benzene =$ 78$ ; Molar mass of chlorobenzene = $112.5$

asked Jan 18, 2016 by meena.p

1 answer

A cylinder contains $0.03\; m^3$ of Argon gas at a temperature of $25^\circ C$ and a pressure of $1.2\; MPa$. Find the internal energy of the gas.

asked Jul 29, 2014 by balaji.thirumalai

1 answer