Question 1

Which of the elements gives acidic oxide?

Accepted Answer

N

Answer

As

Answer

Bi

Answer

Sb

Question 2

In group V-A elements the most electronegative element is:

Accepted Answer

N

Answer

Bi

Answer

Sb

Answer

P

Question 3

What is %age of calcium phosphate in bone ash?

Accepted Answer

80

Answer

60

Answer

20

Answer

40

Question 4

Laughing gas is chemically?

Accepted Answer

N$_2$O

Answer

NO$_2$

Answer

NO

Answer

N$_4$O$_4$

Question 5

The oxidation of NO in air produces:

Accepted Answer

N$_2$O$_4$

Answer

NO$_4$

Answer

NO$_2$

Answer

N$_2$O$_3$

Question 6

Which metal is rendered passive by HNO$_3$ due to formation of a film of metal oxide over the metal?

Accepted Answer

Co

Answer

Pt

Answer

Sn

Answer

Mn

Question 7

Which of the following is a reddish brown gas?

Accepted Answer

NO$_2$

Answer

N$_2$O$_3$

Answer

N$_2$O$_5$

Answer

NO

Question 8

Which catalyst is used in contact process?

Accepted Answer

V$_2$O$_5$

Answer

SO$_3$

Answer

Ag$_2$O

Answer

Fe$_2$O$_3$

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