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Deliquescence...

Deliquescence and Alkaline Earth Metal Halides

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Q. Which of the following statement(s) is/are correct ?

$K_{2} C r_{2} O_{7}$ solution becomes yellow on increasing pH beyond $7$
Orange colour of $C r_{2} O_{7}^{2 -}$ is due to d-d transition
$N a_{2} C r_{2} O_{7}$ is preferred over $K_{2} C r_{2} O_{7}$ in volumetric analysis
Both (B) & (C)

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Q.

Dehydration of hydrates of halides of calcium, barium and strontium i.e., $C a C l_{2} . 6 H_{2} O, B a C l_{2} .2 H_{2} O, S r C l_{2} . 2 H_{2} O,$
can be achieved by heating these become wet on keeping in the air. Which of the following statements. Is correct about these halides?
(a) Act as dehydrating agent
(b) Can absorb mositure from air
(c) Tendency to form hydrate decrease from calcium to barium
(d) All of the above

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Q. To an aqueous solution containing ions such as

A l^{3 +}, Z n^{2 +}, C a^{2 +}, F e^{3 +}, N i^{2 +}, B a^{2 +} and C u^{2 +}

was added conc.

H C l

, followed by

H_{2} S

.

The total number of cation precipitated during this reactions is/are :

2
4
3
1

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Q. Few drops of

H N O_{3}

are added to the II group before proceeding to the III group cation analysis to:

None of these
precipitate III group cation
convert $F e^{2 +}$ to $F e^{3 +}$
convert $F e^{3 +}$ to $F e^{2 +}$

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Q. Choose the correct statement(s):

$B e C O_{3}$ is kept in the atmosphere of $C O_{2}$ since, it is least thermally stable
$B e$ dissolves in an alkali solution forming $[B e (O H)_{4}]^{2 -}$
$B e F_{2}$ forms complex ion with $N a F$ in which $B e$ goes with cation
$B e F_{2}$ forms complex ion with $N a F$ in which $B e$ goes with anion

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Q.

Identify the correct formula of halides of alkaline earth metals from the following .
(a) $B a C l_{2} . 2 H_{2} O$ (b) $B a C l_{2}$ (c) $C a C l_{2} . 6 h_{2} O$ (d) $S r C l_{2} . 4 H_{2} O$

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Q. Most stable carbonate is:-

$N a_{2} C O_{3}$
$C a C O_{3} 4$
$K_{2} C O_{3}$
$M g C O_{3}$

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Q. On additon of KI to the solution gives a yellow precipitate which soluble in boiling water and reappears on cooling as shining crystals. The cation present in the solution is

$B i^{3 +}$
$A l^{3 +}$
$C u^{2 +}$
$P b^{2 +}$

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Q. Oxidation number of carbon and total number atoms in carbon suboxide are, respectively :

$+ 5, 4$
$+ \frac{4}{3}, 3$
$+ \frac{4}{3}, 5$
$+ 4, 5$

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Q. Statement: The oxidation number of carbon in

N a C N S

is

+ 4

State whether the given statement is true or false.

False
Anomalous
True
None of these

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Q. Of the following the commonly used in a laboratory desiccator is

dry NaCl
none
anhy.
anhy

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Q.

H_{2} O_{2}

exhibits dehydrating property.
If this is true enter 1, if false enter 0.

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Q. Among the given elements:

O, C l, F, N, P, S n, T l, N a

and

T i

, the number of elements showing only one non-zero oxidation state is :

$4$
$2$
$3$
$5$

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Q. Bauxite, diaspore and cryolite are the ore of the:

aluminium
zinc
copper
silver

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Q. Li does not resemble with other alkali metals in following properties:

$L i_{2} C O_{3}$ decomposes into oxides while other alkali metal carbonates are thermally stable
LiCl is predominantly covalent
all are correct
$L i_{3} N$ is formed, when Li metal is heated with $N_{2}$ gas

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Q. Which of the following is not an ore of aluminium?

Bauxite
Cryolite
Kernite
Corundum

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Q. The ratio of oxygen atom having

- 2

and

- 1

oxidation numbers in

S_{2} O_{8}^{2 -}

is three.
If true enter 1, else enter 0.

1

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Q. Oxidation number of carbon in

(C N)_{2}

is

+ 3

.
If true enter 1, else enter 0.

1

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Q. Halides of alkaline earth metals from hydrates such as,

M g C l_{2} \cdot 6 H_{2} O, C a C l_{2} \cdot 6 H_{2} O, B a C l_{2} \cdot 2 H_{2} O

, and

S r C l_{2} \cdot 2 H_{2} O

.

This shows that halides of group II elements :

are hygroscopic in nature.
act as dehydrating agents.
can absorbs moisture from air.
cannot absorbs moisture from air.

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Q. Oxidation state of carbon in

C H C l_{3}

is :

+ 1
+ 4
+ 2
- 2

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Q. Passing

H_{2} S

gas into a mixture of

M n^{2 +}, N i^{2 +}, C u^{2 +} and H g^{2 +}

ions in an acidified aqueous solution precipitates

$N i S and H g S$
$M n S and N i S$
$M n S and C u S$
$C u S and H g S$

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Q. Both boron and silicon form binary compounds with other metals. One such example is__________.

calcium
magnesium
aluminium
barium

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Q. What is the magnitude of summation of oxidation states of all oxygen in

C r O_{5}

?

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Q. Among the alkaline earth metals, the element forming predominantly covalent compound is:

Barium
Beryllium
Strontium
Calcium

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Q.

S O_{2}

gas is used as a bleaching agent. Its bleaching action is_______.

temporary and due to its oxidizing nature
temporary and due to its reducing action
permanent and due to its oxidizing action
permanent and due to its reducing action

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Q. What happens when the following are heated?
Hydrated stannous chloride

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Q. Oxidation number of carbon in "

C_{3} O_{2}

" and "

M g_{2} C_{3}

" are respectively :

$- \frac{4}{3}, + \frac{4}{3}$
$+ \frac{4}{3}, - \frac{4}{3}$
$- \frac{2}{3}, + \frac{2}{3}$
$+ \frac{2}{3}, - \frac{2}{3}$

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Q. The oxidation state of

S

in

N a_{2} S_{4} O_{6}

is:

2.5
+2 and +3 (two $S$ have +2 and two $S$ have +3)
+ 2 and +3 (three $S$ have +2 and one $S$ has +3)
+ 5 and 0 (two $S$ have +5 and the other two $S$ have 0)

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Q. A salt which will turn dark on exposure to sunlight has the formula :

$K_{2} C_{2} O_{4}$
${C a C l}_{2}$
$A g C l$
${F e}_{4} [{F e (C N)}_{6}]$

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Q. Read the following passage and answer the given questions.

One of the chief uses of sodium carbonate has been in the conversion of

C a (O H)_{2} (s)

to concentrated aqueous solution of NaOH which in turn was used in the manufacture of soap.

C a (O H)_{2} (s) + 2 N a^{+} (a q) + C O_{3}^{2 -} (a q) ⇌ C a C O_{3} (s) + 2 N a^{+} (a q) + 2 O H^{-} (a q)

In 1775, in order to gain independence from the importation of natural

N a_{2} C O_{3}

, the French government offered a prize to anyone who could devise a process to prepare

N a_{2} C O_{3}

from NaCl.

A more economical process but based on the same principle was given by :

Solvay
Williamson
Haber
Leblanc

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