Explanation

Halogens (Group 17 elements) react with hydrogen gas to form hydrogen halides, also known as hydrogen halogenides.

The reaction is:

• H2 (hydrogen gas) + X2 (halogen gas) → 2HX (hydrogen halide)
• Where X represents the halogen element (e.g., Cl, Br, I, F).

Explanation

• The word "avidly" means with great enthusiasm or eagerness, which fits the context of a miser gazing at a pile of gold coins.
• A miser is someone who loves money and material wealth, so it's likely they would gaze at their treasure with a strong desire and enthusiasm.
• Here's the sentence with the correct answer: The miser gazed avidly at the pile of gold coins in front of him.
  

Explanation

Wavelength of slow moving neutrons is about 10^-10 m.

Explanation

Arnon and Stout proposed the idea of essential mineral nutrients of the plant.

Explanation

• Electrons exhibit diffraction effects because their de Broglie wavelength is similar to the spacing between atomic layers in a crystal.
• The de Broglie wavelength of an electron is given by λ = h/p, where h is Planck's constant and p is the electron's momentum.
• For electrons in a crystal, this wavelength is typically in the range of 0.1-1 nanometers, which is similar to the spacing between atomic layers in the crystal.
• As a result, electrons interact with the crystal lattice and exhibit diffraction effects, such as bending around corners or passing through the crystal in specific directions.

Explanation

• Paracrine signaling is a type of cell signaling where cells communicate with each other through chemical signals, such as local hormones or neurotransmitters, that are released into the extracellular space and bind to receptors on nearby cells.
• This type of signaling is typically short-range and affects cells in a localized area.

Explanation

The word CHORD has 5 distinct letters: C-H-O-R-D.

When taking all the letters together, the number of ways to arrange them is equal to the number of permutations of 5 items, which is calculated as:

5! = 5 × 4 × 3 × 2 × 1 = 120

Explanation

The error is in the phrase "Rest since one week."

Corrected phrase: It should be "rest for the past week" or "rest for a week."

The phrase "since one week" is incorrect in English.

"Since" is used to refer to a specific point in time (e.g., "since Monday"), while "for" is used to refer to a duration (e.g., "for a week").

So the correct sentence should be: "Because of the cricket tournament and organizational work, I have hardly had any rest for the past week."

Explanation

To have an axe to grind means a private task to complete, a personal job to be done.

Explanation

In the dark, a Light Dependent Resistor (LDR) has a high resistance.