Question

# Which of the following attacks glass

*HCl*
- HF
*HI*
- HBr

*HCl**HI*## The correct answer is: HF

### Glass being a mixture of sodium and calcium silicates reacts with hydrofluoric acid forming sodium and calcium fluorosilicates respectively.

The etching of glass is based on these reactions.

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Two parallel conducting plates, each of area A, are separated by a distance. Now, the left plate is given a positive charge Q. A positive charge q of mass m is released from a point near the left plate. Find the time taken by the charge to reach the right plate

Two parallel conducting plates, each of area A, are separated by a distance. Now, the left plate is given a positive charge Q. A positive charge q of mass m is released from a point near the left plate. Find the time taken by the charge to reach the right plate

The work required to put the four charges at the corners of a square of side a, as shown in figure, is

The work required to put the four charges at the corners of a square of side a, as shown in figure, is

Charges +q and –q are placed at points *A* and *B* respectively which are a distance 2L apart, *C* is the mid-point between *A* and *B*. The work done in moving a charge + Q along the semicircle *CRD* is

Charges +q and –q are placed at points *A* and *B* respectively which are a distance 2L apart, *C* is the mid-point between *A* and *B*. The work done in moving a charge + Q along the semicircle *CRD* is

A 10 μF capacitor and a 20μ F capacitor are connected in series across 200 V supply line. The charged capacitors are then disconnected from the line and reconnected with their positive plates together and negative plates together and no external voltage is applied. What is the potential difference across each capacitor?

A 10 μF capacitor and a 20μ F capacitor are connected in series across 200 V supply line. The charged capacitors are then disconnected from the line and reconnected with their positive plates together and negative plates together and no external voltage is applied. What is the potential difference across each capacitor?

An electron enters the space between the plates of a charged capacitor as shown. The charge density on the plate is σ Electric intensity in the space between the plates is E .A uniform magnetic field also exists in the space perpendicular to the direction of E The electron moves perpendicular to both E and B without any change in direction. The time taken by the electron to travel a distance I in the space is

An electron enters the space between the plates of a charged capacitor as shown. The charge density on the plate is σ Electric intensity in the space between the plates is E .A uniform magnetic field also exists in the space perpendicular to the direction of E The electron moves perpendicular to both E and B without any change in direction. The time taken by the electron to travel a distance I in the space is