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Assertion: Ammonia is generaiiy excreted by diffusion across body surfaces or through gin surfaces (in fish) as ammonium ions. Reason: Ammonia is rea

Monjur Alahi

Assertion: Ammonia is generaiiy excreted by diffusion across body surfaces or through gin surfaces (in fish) as ammonium ions. 
Reason: Ammonia is readily soiubie in water.
A. if both assertion and reason are true and the reason is correct explanation of the assertion
B. if both assertion and reason are true but reason is not a correct explantion of the assertion
C. If assertion is true but reason is false
D. If both assertion and reason are false.


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Salim Ahmed Kawsar

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Correct Answer - A
Ammonia, as it is readily soluble, is generally excreted by diffusion across body surfaces or through gill surfaces (in fish) as ammonium ions. Kidneys do not play any significant role in its removal.

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A transparent material is bounded by two surfaces of which one (or) both – surfaces are spherical is called

Correct option is  D) lens

2 Answers 2 views
By which method do you separate Ammonium chloride from a mixture containing Sodium chloride and Ammonium chloride ? 

A) sublimation

2 Answers 1 views
A cell of emf E and internal resistance r is connected across an external resistance R (R >> r). The p.d. across R is

Correct option is: (B) E(I – \(\frac{r}{R}\))

2 Answers 1 views
External fertilisation occurs in  A) frog – snake  B) fish – snake C) frog – fish  D) fish – rat

(C) frog – fish

2 Answers 1 views
In the food chain which shows the human being, big fish and the small fish, the last place is occupied by ………

(C) Human being

2 Answers 1 views
1. (a) Is ammonia more dense or less dense than air? (b) What property of ammonia is demonstrated by the Fountain Experiment? (c) Write the balanced equation for the reaction between ammonia and sulphuric acid. 2. Pick the odd member from the list giving reasons: (a) Ammonia, sulphur dioxide, hydrogen chloride, carbon dioxide. (b) Copper oxide, aluminium oxide, sodium oxide, magnesium oxide. 3. Give reasons for the following : (a) Liquid ammonia is used as a refrigerant in ice plants. (b) Aqueous solution of ammonia is used for removing grease stains from woollen clothes. (c) Aqueous solution of ammonia gives a pungent smell. (d) Aqueous solution of ammonia conducts electricity.

(1) (a) ammonia is less dense than air (b) solubility in water (c) 2NH3 + H2SO4 → (NH4)2SO4 (2) (a) Ammonia → because - NH3 is basic while, SO2,HCl and CO2 are acidic oxides. (b) CuO,...

2 Answers 1 views
Statement-1:Decomposition of `H_(2)O_(2)` is a dispoportionation reaction. Statement-2:`H_(2)O_(2)` undergoes simultaneous oxidation and reduction rea

(a) Statement-2 is the correct explantion for statement-1

2 Answers 1 views
Statement-1. Ammonia has lower molecular mass than `N_(2)`. Statement-2. At a given temperature te rate of diffusion is inversely proportional to the

Correct Answer - A Statement-2 is the correct explanation for statement-1.

2 Answers 1 views
$ Phosphates are identified by the yellow precipitate obtained on adding ammonium molybdate solution ! Ammonium phosphomolybdate is a yellow compoud.

R is correct explanation of A

2 Answers 1 views
A: Chitinous exoskeleton is a characteristic feature of arthropods. R: It allows diffusion of water vapour from atmosphere to the body.

Correct Answer - C If assertion is true statement but reason is false, them mark (3).

2 Answers 1 views

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