1
AP EAPCET 2021 - 19th August Evening Shift
MCQ (Single Correct Answer)
+1
-0

Which among the following pairs is not an acidic buffer?

A
$$\mathrm{HCOOH}$$ and $$\mathrm{HCOOK}$$
B
$$\mathrm{HClO}_4$$ and $$\mathrm{NaClO}_4$$
C
$$\mathrm{C}_6 \mathrm{H}_5 \mathrm{COOH}$$ and $$\mathrm{C}_6 \mathrm{H}_5 \mathrm{COONa}$$
D
$$\mathrm{HCN}$$ and $$\mathrm{KCN}$$
2
AP EAPCET 2021 - 19th August Evening Shift
MCQ (Single Correct Answer)
+1
-0

Assertion (A) The colour of old lead paintings can be restored by washing them with a dilute solution of $$\mathrm{H}_2 \mathrm{O}_2$$.

Reason (R) Hydrogen peroxide reduces $$\mathrm{PbS}$$ to $$\mathrm{Pb}$$.

A
Both $$A$$ and $$R$$ are true and $$R$$ is a correct explanation for $$A$$.
B
Both $$A$$ and $$R$$ are true but $$R$$ is not a correct explanation for $$A$$.
C
$$A$$ is true but $$R$$ is false.
D
$$A$$ is false but $$R$$ is true.
3
AP EAPCET 2021 - 19th August Evening Shift
MCQ (Single Correct Answer)
+1
-0

In the preparation of baking soda, H$$_2$$O and CO$$_2$$ in ratio ......... is used to react with Na$$_2$$CO$$_3$$.

A
3 : 1
B
1 : 2
C
2 : 1
D
1 : 1
4
AP EAPCET 2021 - 19th August Evening Shift
MCQ (Single Correct Answer)
+1
-0

The structure of diborane B$$_2$$H$$_6$$ is given below. Identify the bond angles of x and y. In diborane, ........... are commonly known as banana-bonds.

AP EAPCET 2021 - 19th August Evening Shift Chemistry - Chemical Bonding and Molecular Structure Question 15 English

A
x = 101$$\Upsilon$$, y = 118$$\Upsilon$$ and 2-centred-3-electron bonds
B
x = 97$$\Upsilon$$, y = 120$$\Upsilon$$ and 3-centred-2-electron bonds
C
x = 118$$\Upsilon$$, y = 79$$\Upsilon$$ and ionic bond between the two boron
D
x = 79$$\Upsilon$$, y = 118$$\Upsilon$$ and ionic bond between the two boron
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