Nitrogen gas is treated with hydrogen gas in the presence of a catalyst at 773K to form ammonia gas. This reaction is an example of:

Neutralisation reaction

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Combination reaction

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Double Displacement reaction

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Decomposition reaction

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Solution

The correct option is B Combination reaction
Nitrogen( $N_{2}$ ) gas combines with hydrogen( $H_{2}$ ) gas in the presence of catalyst at 773K to form ammonia ( $N H_{3}$ ) gas. This is a combination reaction and equation for this can be written as:
$N_{2} (g) + 3 H_{2} (g) c a t a l y s t - --- \to 773 K 2 N H_{3} (g)$

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Nitrogen gas is treated with hydrogen gas in the presence of a catalyst at 773K to form ammonia gas. This reaction is an example of:

The correct option is B Combination reactionNitrogen(N2) gas combines with hydrogen(H2) gas in the presence of catalyst at 773K to form ammonia (NH3) gas. This is a combination reaction and equation for this can be written as:N2(g)+3H2(g)catalyst−−−−→773K2NH3(g)