chlorine
aluminium
silicon
magnesium
sodium
Correct answer is B
No explanation has been provided for this answer.
Which of the following represents a precipitation reaction?
H2SO4 + NaCl \(\to\) NaHSO4 + HCl
Fe +H2SO4 \(\to\) FeSO4 + H2
4HCl + MnO2 \(\to\) MnCl2 + 2H2O + Cl2
Na2SO4 + pb(NO3) \(\to\) PbSO4 + 2NaNO
CuO +2HCl \(\to\) Cl2 + H2O
Correct answer is D
No explanation has been provided for this answer.
5
15
25
35
50
Correct answer is C
CaCO3 + CaO \(\to\) 2CaO + 2CO2
44gm of CO3 is liberated by 100gm of CaCO3
0.33gm of CO2 will be liberated by \(\frac{100}{44}\) x 0.33
= 0.75 of CaCO3
Amount of CaO = 1 - 0.75
= 0.25
% of CaO = \(\frac{0.25}{1} \times \frac{100}{1}\)
= 25%
0.54g
1.08g
1.62g
2.16g
3.24g
Correct answer is D
Same period, Same current
\(Cu^{2+} + 2e^- → Cu; 2Ag^+ + 2e^-\) → Ag
From the equation above, 2 mol Ag ≡ 1 mol Cu
But 0.63g Cu = \(\frac{0.63}{63}\) = 0.01mole Cu
Hence 0.002 mole Ag is deposited
mass of Ag deposited = 0.002 x 108 = 2.16g.
In the above experiment, the litmus paper will initially
be bleached
turn green
turn red
turn blue
turn black
Correct answer is D
No explanation has been provided for this answer.
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