CBSE Class 10 Science 2018 · Paper 31/1 · Question 7(a)
2 mL of sodium hydroxide solution is added to a few pieces of granulated zinc metal taken in a test tube. When the contents are warmed, a gas evolves which is bubbled through a soap solution before testing. Write the equation of the chemical reaction involved and the test to detect the gas. Name the gas which will be evolved when the same metal reacts with dilute solution of a strong acid.
Answer
Zinc and warm sodium hydroxide give sodium zincate and hydrogen, which burns with a pop; dilute strong acids also give hydrogen.
Equation: (sodium zincate and hydrogen)
Test: when a burning splinter or candle is brought near the gas (a gas-filled soap bubble), the gas burns with a pop sound; so the gas is hydrogen.
With a dilute solution of a strong acid, the same metal also gives hydrogen gas, :
🔒 Step-by-step solution
Sign up free to see every step of how it is worked out.
From the board papers
More questions from Acids, Bases and Salts
Class 10 Science — every question with an expert-verified, step-by-step solution.
- Q1 A solution turns red litmus blue, its pH is likely to be
- Q1 You have been provided with three test tubes. One of them contains…
- Q2 A solution reacts with crushed egg-shells to give a gas that tu…
- Q3 10 mL of a solution of NaOH is found to be completely neutralised b…
- Q4 Which one of the following types of medicines is used for trea…
- Q5 Write word equations and then balanced equations for the reaction t…
- Q6 Compounds such as alcohols and glucose also contain hydrogen bu…
- Q7 Why does distilled water not conduct electricity, whereas rain wat…
- Q8 Why does dry HCL gas not show acidic behaviour in the absence of…
- Q9 Five solutions A, B, C, D and E when tested with universal indicato…
- Q10 Equal lengths of magnesium ribbons are taken in test tubes A and B.…
- Q11 Fresh milk has a pH of 6. How do you think the pH will change as i…
All 352 questions on Acids, Bases and Salts → Browse all Science chapters →