The p-Block Elements Test

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The p-Block Elements Test - 75

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Weekly Quiz Competition

Question 1
1 / -0

Calcium cyanide on treatment with steam under pressure gives $$NH_{3}$$ and

A
$$CaHCO_3$$

B
$$CaO$$

C
$$Ca(OH)_{2}$$

D
$$CaCO_{3}$$

Solution

Calcium cyanamide on treatment with steam under pressure gives $$NH_{3}$$ and $$CaCO_{3}.$$

$$CaCN_{2}+3H_{2}O\xrightarrow [ pressure ]{ under } CaCO_{3}+2NH_{3}$$
Question 2
1 / -0

In the Ostwald's process for the manufacture of $$HNO_{3}$$, the catalyst used is

A
Mo

B
Fe

C
Ni

D
Pt

Solution

$$ 4NH_{3}+5O_{2}\xrightarrow[1100 K]{Pt -gaugae}4NO \ \overset{O_{2}}{\longrightarrow} 4NO_{2} \overset{2H_{2}O+O_{2}}{\longrightarrow} 4HNO_{3} $$

So, option D is the correct answer,
Question 3
1 / -0

Calcium cyanamide on treatment with steam produce

A
$$CaCO_{3}+NH_{3}$$

B
$$CaHCO_{3}+NH_{3}$$

C
$$CaO+NH_{3}$$

D
$$Ca(OH)_{2}+NH_{3}$$

Solution

Calcium cyanamide on treatment with steam produce $$CaCO_{3}+NH_{3}.$$

$$CaCN_2+3H_2O\to CaCO_3+2NH_3$$
Question 4
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Point out in which of the following properties oxygen differs from the rest of the members of its family (Group - $$VIA$$).

A
High value of ionisation energies

B
Oxidation states $$(2,4,6)$$

C
Polymorphism

D
Formation of hydrides

Solution

Oxygen does not show $$+4$$ and $$+6$$ oxidation state. Oxygen shows $$-2,-1, -\dfrac12, 0, +1$$ and $$+2$$ oxidation state.
Question 5
1 / -0

Directions For Questions

Phosphourus occurs in nature in the ferm of stable phosphate. (Animal bones also contain calucium p-hosphate (58%) The important minerals are
(i) Phosphorite, $$ Ca_{2}(PO_{4})_{2} $$ (ii) Chloraptite, $$ Ca_{3}(PO_{4})_{2} CaCl_{2} $$ ,
(iii)Fluoraptite, $$ Ca_{3}(PO_{4})_{2} CaF_{2} $$
These are some deposits of nitrates and phosphates in earth's crust. Nitrates are more soluble in water. Nitrates are difficult to reduce under the laboratory conditions but microbes do ti easily compounds of phosporus and nitrogen are used as fertilizer.

...view full instructions

Amongs the following which is not member of apatite family

A
$$ Ca_{9}(PO_{4})_{6}.CaCl_{2} $$

B
$$ Ca_{9}(PO_{4})_{6}.CaF_{2} $$

C
$$ Ca_{9}(PO_{4})_{2}.Ca(OH)_{2} $$

D
None of these

Solution
Question 6
1 / -0

Ammonia gas is not prepared by

A
reduction of sodium nitrite or sodium nitrate by the reaction of Zinc dust and sodium hydroxide.

B
hydrolysis of calcium cyanamide.

C
heating ammonium chloride with slaked lime

D
heating of $$ (NH_{4})_{2}Cr_{2}O_{7} $$

Solution

(A) $$ NO_{2}^{-}+7\left [ H \right ]^{-}\xrightarrow{Zn/NaOH} NH_{3}+2H_{2}O $$ ; $$ NO_{3}^{-}+9\left [ H \right ]^{-}\xrightarrow{Zn/NaOH}NH_{3}+3H_{2}O $$

(B) $$ CaCN_{2}+3H_{2}O\rightarrow CaCO_{3}+2NH_{3} $$

(C) $$ NH_{4}Cl+Ca(OH)_{2}\rightarrow 2NH_{3}+CaCl_{2}+2H_{2}O $$

(D) $$ \left ( NH_{4} \right )_{2}Cr_{2}O_{7}\rightarrow N_{2}Cr_{2}O_{3}+4H_{2}O $$

Option D is correct.
Question 7
1 / -0

Fill in the blanks :
Potassium nitrate crystals on heating strongly yield potassium nitrite and ________ gas.

A
oxygen

B
phosphoric

C
nitric acid

D
sulphurous

Solution
Question 8
1 / -0

Ammonia can be obtained by adding water to?

A
Ammonium chloride

B
Ammonium nitrite

C
Magnesium nitride

D
Magnesium nitrate
Question 9
1 / -0

Which is the most abundant element on the earth's crust among group $$15$$ elements?

A
$$N$$

B
$$As$$

C
$$P$$

D
$$Sb$$

Solution
Question 10
1 / -0

Oxygen gas is not produced from the following decomposition reaction :

A
$$K_2Cr_2O_7 \xrightarrow{\Delta}$$

B
$$Ag_2C_2O_4 \xrightarrow{\Delta}$$

C
$$Pb(NO_3)_2 \xrightarrow{\Delta}$$

D
$$Ag_2CO_3 \xrightarrow{\Delta}$$

Solution

Thermal decomposition of silver oxalate gives metallic silver and $$CO_2$$ gas.
The reaction is as follows:

$$Ag_2C_2O_4\xrightarrow{\Delta} 2Ag(s)+2CO_2(g)$$

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Re-Attempt Weekly Quiz Competition

The p-Block Elements Test - 75

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The p-Block Elements Test - 75

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SHARING IS CARING

Question 1

$$CaHCO_3$$

$$CaO$$

$$Ca(OH)_{2}$$

$$CaCO_{3}$$

Solution

Question 2

Mo

Fe

Ni

Pt

Solution

Question 3

$$CaCO_{3}+NH_{3}$$

$$CaHCO_{3}+NH_{3}$$

$$CaO+NH_{3}$$

$$Ca(OH)_{2}+NH_{3}$$

Solution

Question 4

High value of ionisation energies

Oxidation states $$(2,4,6)$$

Polymorphism

Formation of hydrides

Solution

Question 5

$$ Ca_{9}(PO_{4})_{6}.CaCl_{2} $$

$$ Ca_{9}(PO_{4})_{6}.CaF_{2} $$

$$ Ca_{9}(PO_{4})_{2}.Ca(OH)_{2} $$

None of these

Solution

Question 6

reduction of sodium nitrite or sodium nitrate by the reaction of Zinc dust and sodium hydroxide.

hydrolysis of calcium cyanamide.

heating ammonium chloride with slaked lime

heating of $$ (NH_{4})_{2}Cr_{2}O_{7} $$

Solution

Question 7

oxygen

phosphoric

nitric acid

sulphurous

Solution

Question 8

Ammonium chloride

Ammonium nitrite

Magnesium nitride

Magnesium nitrate

Question 9

$$N$$

$$As$$

$$P$$

$$Sb$$

Solution

Question 10

$$K_2Cr_2O_7 \xrightarrow{\Delta}$$

$$Ag_2C_2O_4 \xrightarrow{\Delta}$$

$$Pb(NO_3)_2 \xrightarrow{\Delta}$$

$$Ag_2CO_3 \xrightarrow{\Delta}$$

Solution

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