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QN INDICATORS Marks
1 Chargeless 1
2 7th 1
3 Triple bond 1
4 CO2 1
5 Nitrogen 1
6 Potssium permngnte (KMnO4) 1
7 ii. Soluble in water
iv. Conduct electricity in molten state and in aqueous solution
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1
8 Availability is plenty
High calorific value
No polution
Water is formed as product
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9 a) Carbon – 14
b) Deuterium
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1
10 a) 3N2 + H2 → 2NH3
b) H2 + I2 → 2HI
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1
11 Elements with similar properties are placed in same group
Correction of wrongly determined atomic masses
Columns left vacant for unknown elements and predicted their properties
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1
12 ii. Transparent
iii. Very hard
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13 a) Beaker B
b) Surface area
c) Increase concentration of acid (HCl)
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14 a. Ernest Rutherford
b. J. J. Thomson
c. James Chadwick
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1
15 a) C
b) D
c) A
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1
16 a) BaCl2
b) 2
c) Chloride ion (Cl-
)
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1
17 a) 17Cl
b) 13Al
c) 18Ar = 2, 8, 8
1
1
1
18 a) Photosynthesis
b) Dry ice
As refrigerant
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1
1
CHEMISTRY
Time: 11/2 Hours Total Score: 40
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ANNUAL EXAMINATION 2021-22
STD-IX
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To create foggy effects in stage shows
19 a) 17
b) 35 – 17 = 18
c) +17
d) M
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20 a) Chlorine (Cl2)
b) Sulphuric acid (H2SO4)
c) Hypochlorus acid (HOCl)
d) Disinfectant
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1
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21 a) P, R
b) R
c) S
d) 3
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22 a) Sodium (Na)
b) 2, 8
c) Ionic bonding
d) Na2O
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1
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23 a) NaCl
b) Neutralisation reaction
c) Acid – Sulphuric acid (H2SO4)
Alkali – Calcium hydroxide (Ca(OH)2)
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1
24 a) Mg, HCl
b) Mg
c) Both oxidation and reduction takesplace simultaneously
d) Mg
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1
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