Q No. 70.b
1. Chief ore of chromium (A) on roasting
with Sodium carbonate gives compound (B) and (C). B on acidification gave
compound (D) which on treatment with KCl gave compound (E). Identify the
compounds A, B, C, D and E. Explain with proper chemical reactions.
ANSWER
|
(A)
Chromite ore
|
(B)
Sodium chromate
|
(C)
Iron (III) oxide
|
(D)
Sodium dichromate
|
(E)
Potassium dichromate
|
2. The chief ore of chromium A on
roasting with molten sodium carbonate gives compound B. Compound B on
acidification with conc. H2SO4 gives compound C. Compound
C on treatment with KCl gives compound D. Identify A, B, C and D. Explain the
reactions.
3. A compound of
chromium in which chromium exists in + 6 oxidation state. Its chief ore A on
roasting with molten alkali gives compound B. This compound B on acidification
gives compound C. Compound C on treatment with KCl gives compound D. Identify
compounds A, B, C and D. Explain the proper chemical reactions. M–11 / J–12
ANSWER
|
(A)
Chromite ore
|
(B)
Sodium chromate
|
(C)
Sodium dichromate
|
(D)
Potassium dichromate
|
4. An element (A)
belonging to group 6 and period 4 is silvery white in colour. Red hot A
decomposes steam liberating hydrogen and forming B. A also reacts with conc.
Sulphuric acid forming C with evolution of SO2.
Identify A, B and C. Explain the two reactions. J–07
ANSWER
|
(A)
Chromium
|
(B)
Chromic oxide
|
(C)
Chromic sulphate
|
5. An element (A) occupying group number
11 and belonging to the 4th period, is reddish brown in colour. (A) is extracted
from its mixed sulphide ore (B). A reacts with dil. H2SO4
in the presence of air to form (C). With water C gives a blue compound D. On
treatment with conc. nitric acid (A) gives compound (E). Identify (A), (B),
(C), (D) and (E). Give the reactions also. J–10
ANSWER
|
(A)
Copper
|
(B)
Copper pyrites
|
(C)
Copper suphate
|
(D)
Copper sulphate Pentahydrate
|
(E)
Cupric nitrate
|
||
6. An element A
occupies group number 11 and period number 4. This metal is extracted from its
mixed sulphide ore B. A reacts with dil. H2SO4 in
presence of air and forms C which is colourless. With water C gives a blue
compound D. Identify A. B, C and D and explain the reactions. M–07
ANSWER
|
(A)
Copper
|
(B)
Copper pyrites
|
(C)
Copper sulphate
|
(D)
Copper sulphate Pentahydrate
|
7. An element
(A) belonging to Group No. 11 and Period No. 4 is extracted from the pyrite
ore. (A) reacts with oxygen at two different temperatures forming compounds (B)
and (C). (A) also reacts with conc. HNO3 to give (D) with the
evolution of NO2. Find out (A), (B), (C) and (D). Explain the
reactions. O–07
/ M–10
8. (A) is a
reddish brown metal. It belongs to group 11 and period 4 of the periodic table.
When heated below 1370 K, (A) gives a black compound (B). When heated above
1370 K, (A) gives a red compound (C). With concentrated nitric acid, (A)
liberates NO2 gas and gives compound (D). Identify (A), (B), (C) and
(D). Explain the reactions. M–10 / O–07
ANSWER
|
(A)
Copper
|
(B)
Cupric oxide
|
(C)
Cuprous oxide
|
(D)
Cupric nitrate
|
9. An element
(A) belongs to group number 11 and period number 4. (A) is a reddish brown
metal. (A) reacts with HCl in the presence of air and gives compound (B). (A)
also reacts with conc. HNO3 to give compound (C) with the liberation of NO2.
Identify (A), (B) and (C). Explain the reactions. M-06 / J–11
ANSWER
|
(A)
Copper
|
(B)
Copper chloride
|
(C)
Copper nitrate
|
10.
Compound A is a sulphate compound of group 11 element. This compound is also
called as Blue Vitriol. The compound undergoes decomposition at various
temperatures.
100◦C /
230◦C / 720◦C
A ------→ B ------→ C
------→ D
373K
503K 993K
Identify the compounds A, B, C and D and give
equations. J–09
ANSWER
|
(A)
Copper sulphate Pentahydrate
|
(B)
Copper sulphate Monohydrate
|
(C)
Copper sulphate
|
(D)
Cupric oxide + SO3
|
11. An element belongs to group 12 and
period 4 is bluish white in colour. (A) reacts with hot conc. H2SO4
forming (B) with the liberation of SO2. (A) also reacts with dil.HNO3
forming (C) with liberation of N2O. Identify (A), (B) and (C).
Explain the reactions. O–08
ANSWER
|
(A)
Zinc
|
(B)
Zinc sulphate
|
(C)
Zinc nitrate
|
12. An element A
present in Period No. 4 and Group No. 12 on treatment with dil. HNO3
forms B with the liberation of N2O. A when heated with air at 773 K
gives C which is known as philosopher's wool. Identify A. B and C Explain the
reactions involved. O–12
ANSWER
|
(A)
Zinc
|
(B)
Zinc nitrate
|
(C)
Zinc oxide (Philosopher's wool)
|
13. A bluish white metal when treated with
dilute nitric acid gives (A) along with zinc nitrate and water. With very
dilute nitric acid it gives (B) along with zinc nitrate and water. The metal
when heated with air gives (C). What are (A), (B), (C) and (D)? Explain the
reactions. O–09
ANSWER
|
(A)
Nitrous oxide
|
(B)
Ammonium nitrate
|
(C)
Zinc oxide (Philosopher's wool)
|
14. The sulphide
ore of an element of group 12 when roasted gave compound A which on reduction
with carbon gave the element B. The carbonate C of this element is used for
skin diseases. Identify A, B and C and write the required reaction. O–06
ANSWER
|
(A)
Zinc oxide (Philosopher's wool)
|
(B)
Zinc
|
(C)
Zinc carbonate
|
15. An element A
in group number 12 period number 4 is extracted from its sulphide ore. A reacts
with O2 present in the air at 773 K to give compound B which is
called Philosopher's wool. A reacts with hot NaOH to give compound C. A also
reacts with dilute nitric acid and forms compound D with the liberation of N2O.
Find out A. B. C and D. Explain the reactions. O–11
ANSWER
|
(A)
Zinc
|
(B)
Zinc oxide (Philosopher's wool)
|
(C)
Sodium zincate
|
(D)
Zinc nitrate
|
16. A bluish
white metal A present in 4th period and 12th group on heating in air gives a
white cloud B. Metal A on treatment with conc. H2SO4
gives the compound C and SO2 gas. Find A, B and C. Explain the
reactions.
ANSWER
|
(A)
Zinc
|
(B)
Zinc oxide (Philosopher's wool)
|
(C)
Zinc sulphate
|
17. Element A
which belongs to group 12 and period 4 is a bluish white metal. A reacts with
conc. H2SO4 and gives B with the liberation of SO2.
With NaOH A gives compound C. Identify A. B and C. Explain the reactions. M–12
ANSWER
|
(A)
Zinc
|
(B)
Zinc sulphate
|
(C)
Sodium zincate
|
18. The metal B
is extracted from the ore A. On treatment with dil. Nitric acid metal B gives a
compound C, which is also known as Lunar Caustics. The compound C on treatment
with KI gives a yellow precipitate D. Find A, B, C and D. Explain the reactions
of the formation of C and D. M–08
ANSWER
|
(A)
Silver glance / Argentite
|
(B)
Silver
|
(C)
Silver nitrate (Lunar caustic)
|
(D)
Silver
iodide
|
19. An element
(A) belongs to group number 11 and period number 5 and is a lustrous white
metal. (A) reacts with dil. HNO3 to give (B).
(B) with KI gives (C) which is bright yellow coloured precipitate. Identify
(A), (B) and (C). Explain the reactions. O–10
ANSWER
|
(A)
Silver
|
(B)
Silver nitrate (Lunar caustic)
|
(C)
Silver iodide
|
20. Silver reacts
with dil. HNO3 to give compound (A) which on heating at 723 K gives
(B). (B) on further heating gives (C). Further compound (A) reacts with KBr and
gives (D) which is highly useful in photography. Identify (A), (B), (C) and (D)
and write the reactions. J–06 / M–09
ANSWER
|
(A)
Silver nitrate (Lunar caustic)
|
(B)
Silver Nitrite
|
(C)
Silver
and NO2
|
(D)
Silver bromide
|
21. Silver reacts
with dil. HNO3 to give compound (A), which on heating at 723 K gives
compound (B). (B)
on heating gives compound (C). Compound (A) reacts with KBr and gives (D),
which is highly useful in photography. Identify (A), (B), (C) and (D). Explain
the reactions. M–09
/ J–06
ANSWER
|
(A)
Silver nitrate (Lunar caustic)
|
(B)
Silver Nitrite
|
(C)
Silver
and
NO2
|
(D)
Silver bromide
|
INORGANIC CHEMICAL REACTIONS
Sir, is there an easy way to study these probs?
ReplyDeleteThank you for visiting this blog.
DeleteTry the following:
1. Know the position (Period & Group)of the elements in the Periodic table.
2. Remember the Extraction of Metals & its Chemical properties.
3. Remember the Preparation & Properties of Metal compounds.
Also Remember,
i) Metal + Dil. Acid ---> Hydrogen + Metal salt
ii) Metal + Conc. Acid ---> Metal salt + Water + Anhydride of acid
iii) Acid acts as Medium + Oxidising Agent (eg, HNO3)
Similarly, try to simplify to learn easily.
Advance best wishes.