Chemistry

An oxide XO2 has a vapour density of 32. What is the atomic mass of X?

A. 20 B. 32 C. 14 D. 12 Correct Answer: Option B - 32 Explanation Molecular mass = vapour density…

5 years ago

According to Charle’s law, the volume of a gas becomes zero at?

A. −100°C B. −273°C C. −373°C D. 0°C Correct Answer: Option B = −273°C Explanation Where −273°C = 0 K…

5 years ago

The carbon atoms on ethane are?

A. sp² hybridized B. sp³ hybridized C. sp4 hybridized D. sp hybridized Correct Answer: Option B - sp³ hybridized Explanation…

5 years ago

The reddish–brown rust on ion roofing sheets consists of?

A. Fe³+ (H2O)6 B. FeO.H2O C. Fe2O3.3H2O D. Fe3O4.2H2O Correct Answer: Option C - Fe2O3.3H2O Explanation Iron [Fe] reacts with…

5 years ago

What is the change in the oxidation number of copper in the reaction?

Cu2S(g) + O2(g) → 2Cu + SO2(g) A. 0 to + 2 B. 0 to + 1 C. + 1…

5 years ago

The alkyl group is represented by the general formula?

A. CnH2n B. CnH2n−2 C. CnH2n+1 D. CnH2n+2 Correct Answer: Option C - CnH2n+1 Explanation Alkyl group has the general…

5 years ago

The enzyme used in the hydrolysis of starch to dextrin and maltose is?

A. amylase B. diastatse C. invertase D. zymase Correct Answer: Option A - amylase Explanation This is any amylase or…

5 years ago

The reaction of halogens with alkanes in the presence of sunlight is an example of?

A. oxidation reaction B. addition reaction C. hydrogenation reaction D. substitution reaction Correct Answer: Option D - substitution reaction Explanation…

5 years ago

When few drops of concentrated trioxonitrate(V) acid is added to an unknown sample and waned an intense yellow colouration is observed. The likely functional group present in the sample is

A. NH3—C—C=O B. CHO C. CO D. CNH2 Correct Answer: Option A - NH3—C—C=O Explanation Xanthopreitic test for the presence…

5 years ago

An isomer of C5H12 is?

A. 2–ethyl butane B. butane C. 2–methyl butane D. 2–methyl propane Correct Answer: Option C = 2–methyl butane Explanation C5H12…

5 years ago