Is Hydrogen a colorless gas?

Yes, it is colorless. This is what elementary chemistry tells you. But people may be wondering why they are adding a color attribute to hydrogen.

The color attribute of hydrogen comes about by the way it is produced on an industrial scale. There are three colors presently:

Grey hydrogen:

Basically from fossil fuels such as coal or natural gas.

https://www.coalage.com/features/hydrogen-from-coal/#:~:text=H%202%20produced%20by%20steam%20methane%20reforming%20%28SMR%29,hydrogen%20that%20includes%20carbon%20abatement%2C%20such%20as%20CCUS.

https://tinyurl.com/yey9fegt

By far most of the hydrogen presently produced/used is grey hydrogen.

Green hydrogen:

Hydrogen from Electrolysis of water.

This is completely free of carbon in its production.

http://www.chem.gla.ac.uk/cronin/media/papers/Chisholm-Chapter_16_2016.pdf#:~:text=The%20production%20of%20hydrogen%20from%20water%20via%20electrolysis,has%20two%20main%20applications%20as%20an%20energy%20vector.

or

https://tinyurl.com/4y6hektf

Blue hydrogen:

It is similar to Grey hydrogen but the carbon in the process is captured and stored (so-called carbon neutral).

https://www.msn.com/en-us/news/technology/blue-gas-could-become-a-tesla-killer/ar-BB1dOsgr#:~:text=So-called%20%27blue%27%20hydrogen%20is%20the%20name%20given%20to,water%20are%20converted%20into%20hydrogen%20and%20carbon%20monoxide.

https://tinyurl.com/e5k7zrxe

Are there autos that run on Hydrogen in the USA?

 The answer is yes. Japan, Germany South Korea are other countries in the free world (non-communist) that are having cars that run on hydrogen. The filling stations for hydrogen fuel for the cars are not that many but it is improving. Even trains and truck that run are getting into the market place. Recent statistics shows that hydrogen run vehicles are most suited for the heavy and long-haul categories.

Here are cars manufactured by automakers that run on hydrogen. The autos can be bought/leased in the USA. Presently California is the only state that has hydrogen filling stations. The following table shows the countries that support hydrogen and some statistics.

Toyota has been producing cars that run on hydrogen for a number of years. Honda and Hyundai are other makers from the Far East.

Toyota Mirai

Honda Clarity

Hyundai Nexo

Japan is quite serious and there will be thousands of filling stations in the near future.

https://en.wikipedia.org/wiki/Hydrogen_highway_(Japan)

Battery run vehicles are perhaps the best to replace the internal combustion engines in the near term. Probably the scarcity of rare earths (China has a choke hold on these) will drive automakers more towards hydrogen.  

Mega cities in China, India and other populous countries are having health issues related to traffic pollution and clean, hydrogen cars will be of great importance.

What kind electric vehicles will sell in India?

  There are enough billionaires and untold millionaires to buy cars in India, including Elan Musk's. It will definitely help to reduce pollution. There are already EV's manufactured in India. I have seen one in my neighbors since 2014 or so.

https://tinyurl.com/yyky3q2j

https://tinyurl.com/y5xkffju

There are lots of other moneyed folks who can afford. 

I hope that Elon can make a slightly smaller foot print car. The roads are congested. I further suggest that his cars do not violate animal rights, otherwise he will be asking for trouble. You need to share roads with cows, dogs, and sometimes donkeys.

I really suggest he delays his ambition to sell driver-less cars.

Perhaps, he should take up my bet, and if he succeeds, then he may.

The bet is here:

https://hodentek.blogspot.com/2020/10/in-2021-elon-musk-wants-to-sell-his.html

In my opinion, India should straight away go for hydrogen cars by side stepping the lithium battery nightmare. Our landscape is already littered with the auto-industry debris. I do not like to see discarded old batteries piling up on the footpath and on either side of our highways.