1
AP EAPCET 2022 - 4th July Evening Shift
MCQ (Single Correct Answer)
+1
-0

The pair of elements that form both oxides and nitrides, when burnt in air are

A
$$\mathrm{Na}, \mathrm{Mg}$$
B
$$\mathrm{Na}, \mathrm{Be}$$
C
$$\mathrm{Mg}, \mathrm{Ca}$$
D
$$\mathrm{Be}, \mathrm{Mn}$$
2
AP EAPCET 2022 - 4th July Morning Shift
MCQ (Single Correct Answer)
+1
-0

Assertion (A) MgSO$$_4$$ is readily soluble in water.

Reason (R) The greater hydration enthalpy of Mg$$^{2+}$$ ions overcome is lattice enthalpy.

A
A and R both are correct and R is the correct explanation of A .
B
A and R both are correct but R is not the correct explanation of A .
C
A is correct but R is not correct.
D
A is incorrect but R is correct.
3
AP EAPCET 2022 - 4th July Morning Shift
MCQ (Single Correct Answer)
+1
-0

Identify A and B from the following reaction,

$$\mathrm{NaNO}_3 \xrightarrow{\Delta} x A+y B$$

A
$$\mathrm{NaNO}_2, \mathrm{O}_2$$
B
$$\mathrm{Na}_2 \mathrm{O}, \mathrm{NO}_2$$
C
$$\mathrm{Na}_2 \mathrm{O}, \mathrm{NO}$$
D
$$\mathrm{Na}, \mathrm{NO}_2$$
4
AP EAPCET 2021 - 20th August Evening Shift
MCQ (Single Correct Answer)
+1
-0

The main constituent of enamel on the surface of teeth is

A
$$\left[3 \mathrm{Ca}_3\left(\mathrm{PO}_4\right)_2 \cdot \mathrm{CaF}_2\right]$$
B
$$\left[\mathrm{Ca}_3\left(\mathrm{PO}_4\right)_2 \cdot \mathrm{H}_2 \mathrm{O}\right]$$
C
$$\left[3 \mathrm{Ca}_3\left(\mathrm{PO}_4\right)_2 \cdot \mathrm{Ca}(\mathrm{OH})_2\right]$$
D
$$\mathrm{CaF}_2$$

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