1
MCQ (Single Correct Answer)

NEET 2016 Phase 2

The suspension of slaked lime in water is known as
A
lime water
B
quick lime
C
milk of lime
D
aqueous solution of slaked lime.

Explanation



This process is known as slaking of lime.

The paste of lime in water (suspension) is called milk of lime while the filtered and clear solution is known as lime water.
2
MCQ (Single Correct Answer)

AIPMT 2015 Cancelled Paper

Solubility of the alkaline earth metal sulphates in water decreases in the sequence
A
Sr > Ca > Mg > Ba
B
Ba > Mg > Sr > Ca
C
Mg > Ca > Sr > Ba
D
Ca > Sr > Ba > Mg

Explanation

Solubility of alkaline earth metal sulphates decreases down the group because hydration energy decreases.
3
MCQ (Single Correct Answer)

AIPMT 2015 Cancelled Paper

The function of ''Sodium pump'' is a biological process operating in each and every cell of all animals. Which of the following biologically important ions is also a constituent of this pump?
A
K+
B
Fe2+
C
Ca2+
D
Mg2+

Explanation

K+ ion is a constituent of sodium pump.
4
MCQ (Single Correct Answer)

AIPMT 2015

20.0 g of a magnesium carbonate sample decomposes on heating to give carbon dioxide and 8.0 g magnesium oxide. What will be the percentage purity of magnesium carbonate in the sample?
(At. wt. of Mg = 24)
A
96
B
60
C
84
D
75

Explanation

MgCO3 $$\buildrel \Delta \over \longrightarrow $$ MgO + CO2

84 g of MgCO3 $$ \equiv $$ 40 g of MgO

$$ \therefore $$ 20 g of MgCO3 = $${{40} \over {84}} \times 20$$ = 9.52 g of MgO

But Actual yield = 8 g of MgO

$$ \therefore $$ % purity = $${8 \over {9.52}} \times 100$$ = 84%

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