141.
Match the column I with column II and mark the appropriate choice.
| Column I | Column II | ||
|---|---|---|---|
| a. | $${H_2}S{O_4}$$ | 1. | Highest electron gain enthalpy |
| b. | $$CC{l_3}N{O_2}$$ | 2. | Chalcogen |
| c. | $$C{l_2}$$ | 3. | Tear gas |
| d. | Sulphur | 4. | Storage batteries |
A
a - 4, b - 3, c - 1, d - 2
B
a - 3, b - 4, c - 1, d - 2
C
a - 4, b - 1, c - 1, d - 2
D
a - 2, b - 1, c - 3, d - 4
Answer :
a - 4, b - 3, c - 1, d - 2
142. A black compound of manganese reacts with a halogen acid to give greenish yellow gas. When excess of this gas reacts with $$N{H_3}$$ an unstable trihalide is formed. In this process the oxidation state of nitrogen changes from
A
- 3 to + 3
B
- 3 to 0
C
- 3 to + 5
D
0 to - 3
Answer :
- 3 to + 3
143. What are the products formed in the reaction of xenon hexafluoride with silicon dioxide?
A
$$XeSi{O_4} + HF$$
B
$$Xe{F_2} + Si{F_4}$$
C
$$XeO{F_4} + Si{F_4}$$
D
$$Xe{O_3} + Si{F_2}$$
Answer :
$$XeO{F_4} + Si{F_4}$$
144. Assertion: Nitrogen and oxygen are the main components in the atmosphere but these do not react to form oxides of nitrogen. Reason: The reaction between nitrogen and oxygen requires high temperatures.
A
The assertion is incorrect, but the reason is correct
B
Both the assertion and reason are incorrect
C
Both assertion and reason are correct, and the reason is the correct explanation for the assertion
D
Both assertion and reason are correct, but the reason is not the correct explanation for the assertion
Answer :
Both assertion and reason are correct, and the reason is the correct explanation for the assertion
145. A brown ring is formed in the ring test for $$NO_3^ - $$ ion. It is due to the formation of
A
$${\left[ {Fe{{\left( {{H_2}O} \right)}_5}\left( {NO} \right)} \right]^{2 + }}$$
B
$$FeS{O_4} \cdot N{O_2}$$
C
$${\left[ {Fe{{\left( {{H_2}O} \right)}_4}{{\left( {NO} \right)}_2}} \right]^{2 + }}$$
D
$$FeS{O_4} \cdot HN{O_3}$$
Answer :
$${\left[ {Fe{{\left( {{H_2}O} \right)}_5}\left( {NO} \right)} \right]^{2 + }}$$
146. Cement, the important building material is a mixture of oxides of several elements. Besides calcium, iron and sulphur, oxides of elements of which of the group(s) are present in the mixture?
A
Group 2
B
Groups 2, 13 and 14
C
Groups 2 and 13
D
Groups 2 and 14
Answer :
Groups 2, 13 and 14
147. Which of the following has $$p\pi - d\pi $$ bonding ?
A
$$NO_3^ - $$
B
$$SO_3^{2 - }$$
C
$$BO_3^{3 - }$$
D
$$CO_3^{2 - }$$
Answer :
$$SO_3^{2 - }$$
148. On heating ammonium dichromate and barium azide separately we get
A
$${N_2}$$ in both cases
B
$${N_2}$$ with ammonium dichromate and $$NO$$ with barium azide
C
$${N_2}O$$ with ammonium dichromate and $${N_2}$$ with barium azide
D
$${N_2}O$$ with ammonium dichromate and $$N{O_2}$$ with barium azide
Answer :
$${N_2}$$ in both cases
149. Which of the following statements is true?
A
$$HCl{O_4}$$ is a weaker acid than $$HCl{O_3}$$
B
$$HN{O_3}$$ is a stronger acid than $$HN{O_2}$$
C
$${H_3}P{O_3}$$ is a stronger acid than $${H_2}S{O_3}$$
D
In aqueous medium $$HF$$ is a stronger acid than $$HCl$$
Answer :
$$HN{O_3}$$ is a stronger acid than $$HN{O_2}$$
150. The oxidation state of nitrogen is highest in
A
$${N_3}H$$
B
$$N{H_3}$$
C
$$N{H_2}OH$$
D
$${N_2}{H_4}$$
Answer :
$${N_3}H$$