Which of the following liquids has the ability to climb the glass vessel's wall?
1. Alcohol
2. Liquid He
3. Liquid
4. Water
Which of the following statement is false?
1. | Liquid helium is used as a cryogenic liquid. |
2. | XeO3 has four σ and four π-bonds. |
3. | The hybridisation of Xe in XeF4 is sp3d2. |
4. | Among noble gases, the occurrence of argon is highest in air. |
The molecular shapes of SF4, CF4 and XeF4 are:
1. | The same with 2, 0 and 1 lone pairs of electrons on the central atoms, respectively |
2. | The same with 1, 1 and 1 lone pairs of electrons on the central atoms, respectively |
3. | Different with 0, 1 and 2 lone pairs of electrons on the central atoms, respectively |
4. | Different with 1, 0 and 2 lone pairs of electrons on the central atoms, respectively |
Argon is used:
1. To obtain low temperature
2. In high-temperature welding
3. In radiotherapy for the treatment of cancer
4. In filling airships
Under ambient conditions, the total number of gases released as products in the final step of the reaction scheme shown below is/are:
\(XeF_{6} \ \xrightarrow[]{\textbf{Complete hydrolysis}} \ P \ + \ other \ product\)
\(P \ \xrightarrow[]{OH^{-} / H_{2}O} \ Q \ \xrightarrow[]{\textbf{slow disproportionation in}\ OH^{-}/H_{2}O} \ Product\)
1. 0
2. 1
3. 2
4. 3
Among the following reactions, in which of the following, a blue complex will be formed when starch solution is added?
(A) When chlorine is passed through NaI
(B) Sodium iodate is treated with sodium bisulphite solution
(C) KI is treated with and conc.
(D) KI is added to bleaching powder containing dilute acetic acid
(1) A, C
(2) A, D,
(3) B, C, D
(4) A,B,C,D
Decreasing order of reducing power hydrogen halides is:
1. HI > HBr > HCl > HF
2. HF > HI > HBr > HCl
3. HI > HF > HBr > HCl
4. None of the above
Which is a bad conductor of electricity?
(1)
(2) HCl
(3) HBr
(4) HI
HBr and HI reduce sulphuric acid; HCl can reduce and HF reduces:
1.
2.
3.
4. none
The hydrogen fluoride is liquid, unlike the other hydrogen halides, because:
(1) fluorine is a smaller atom
(2) HF is the weakest acid
(3) HF molecules are associated due to hydrogen bonding
(4) is highly reactive