1
TS EAMCET 2023 (Online) 13th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

Identify the correct statements about the hydrides.

I. In saline hydrides oxidation state of hydrogen is +1 .

II. La H is an example of interstitial hydride.

III. $\mathrm{NH}_3, \mathrm{H}_2 \mathrm{O}$ have the tendency to form hydrogen bonds.

IV. Electrolysis of molten sodium hydride liberates $\mathrm{H}_2$ gas at cathode.

A

I and II only

B

I and IV only

C

II and IV only

D

II and III only

2
TS EAMCET 2023 (Online) 13th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

Assertion (A) Alkali metals and their salts impart characteristic flame colours.

Reason (R) Alkali metals have low ionisation enthalpy values. So, electron excitation is possible. The correct option among the following is

A

(A) and (R) are true, (R) is the correct explanation of (A).

B

(A) and (R) are true, but (R) is not the correct explanation of (A).

C

(A) is true but (R) is false.

D

(A) is false but (R) is true.

3
TS EAMCET 2023 (Online) 13th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

When compared with alkaline earth metals, the alkali metals have

A

greater hardness

B

higher boiling points

C

smaller ionic radii

D

lower ionisation enthalpy

4
TS EAMCET 2023 (Online) 13th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

Kernite and cryolite are the minerals of two elements $X$ and $Z$. Respectively $X$ and $Z$ are

A

$\mathrm{B}, \mathrm{Ga}$

B

$\mathrm{B}, \mathrm{Al}$

C

AI, In

D

$\mathrm{B}, \mathrm{TI}$

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