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NEET NEET Questions — Free MCQ Practice

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Assertion : Among hydrides of the elements of group 16, water shows unusual physical properties.

Reason: Water shows unusual pysical properties due to hydrogen bonding between the water molecules.

A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion C. If the assertion is true but the reason is false D. If both the assertion and reason are false

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Explanation

Water shows unusual physical properties due to hydrogen bonding between the water molecules.

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Assertion : Fluorine is a stronger oxidising agent than chlorine.

Reason : Fluorine can displace chlorine from chlorides.

A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion C. If the assertion is true but the reason is false D. If both the assertion and reason are false

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Explanation

Fluorine can displace chlorine from chlorides but chlorine cannot displace fluorine from fluorides.

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Radon is a noble gas. Its radioactivity is used in the treatment of:

A.

typhoid

B.

cancer

C.

cough and cold

D.

thyroid

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Explanation

(b)

Radon decays into radioactive polonium and alpha particles. This emitted radiation made radon useful in cancer therapy.

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The gas used in gas thermometer is:

A.

He

B.

$O_{2}$

C.

Xe

D.

Ne

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Explanation

the gas (preferably hydrogen or helium) is enclosed in a glass or fused-quartz bulb connected to a mercury manometer.

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Liquid flow from a higher to a lower level. Which of the following liquids can climb up the wall of the glass vessel in which it is placed?

A.

Alcohol

B.

Liquid He

C.

Liquid $N_{2}$

D.

Water

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Explanation

Helium has the lowest boiling point

(4.2 K)

among any known substance. When helium is cooled further

(< 2 K)

, it undergoes a phase change. This phase of helium, known as Helium II, is a superfluid. It means that the viscosity of liquid becomes zero (approx.). At the same time, its thermal conductivity becomes infinite.

Because the viscosity is almost zero, the fluid flows very easily as a result of the smallest pressure or change in temperature. The response is so strong that even the smallest forces will help the light-weight liquid climb against the force of gravity.

If you have liquid helium inside and outside your system, the liquid inside will flow until it matches the level of the liquid outside and the temperature.

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Which of the following is not correct?

A.

Liquid helium is used as cryogenic liquid

B.

$X e O_{3}$ has four $σ$ and four $π$ - bonds

C.

The hybridisation of Xe in $X e F_{4}$ is $s p^{3} d^{2}$

D.

Among noble gases, the occurrence of argon in highest in air

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The molecular shape of $S F_{4}, C F_{4} a n d X e F_{4}$ are:

A.

the same with 2, 0 and 1 lone pairs of electrons on the central atoms respectively

B.

the same with 1, 1 and 1 lone pairs of electrons on the central atoms respectively

C.

different with 0, 1 and 2 lone pairs of electrons on the central atoms, respectively

D.

different with 1, 0 and 2 lone pairs of electrons on the central atoms, respectively

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Argon is used:

A.

to obtained low temperature

B.

in high temperature welding

C.

in radio-therapy for treatment of cancer

D.

in filling airships

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Explanation

Argon is also used to form inert atmospheres for arc welding,

growing semiconductor crystals and processes that require shielding from other atmospheric gases.

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Under ambient conditions, the total number of gases released as products in the final step of the reaction scheme shown below is:

$X e F_{6} \overset{C o m p l e t e H y d r o l y s i s}{\to} P + o t h e r p r o d u c t P \overset{O H^{-} / H_{2} O}{\to} Q \overset{S l o w d i s p r o p o r t i o n a t i o n i n O H^{-} / H_{2} O}{\to} P r o d u c t$

A.

0

B.

1

C.

2

D.

3

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Explanation

The complete hydrolysis of XeF6 produces XeOF4 (P), which on treatment with OH-/H2O produces XeO3 (Q). The slow disproportionation of XeO3 in OH-/H2O produces two gaseous products, O2 and Xe, according to the equation: 3XeO3 + 6OH- â†’ Xe + 2XeO4^2- + 3H2O + O2.

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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 $M n O_{2}$ and conc. $H_{2} S O_{4}$

(D) KI is added to bleaching powder containing dilute acetic acid

A.

A, C

B.

A, D,

C.

B, C, D

D.

A,B,C,D

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Explanation

All above are correct

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