A student prepared 20% sodium hydroxide solution in a beaker containing water. The observations noted by him are given below.I. Sodium hydroxide is in the form of pellets.II. It dissolves in water readily.III. The beaker appears cold when touched from outside.IV. Red litmus paper turns blue when dipped into the solution. The correct observations are:(a) I, II, and III(b) II, III and IV(c) III, IV and I(d) I, II and IV
Correct Answer: (d) I, II and IV
Explanation: Sodium hydroxide is in the form of small white pellets and is soluble in water. Being basic in nature, it turns red litmus paper blue. Hence, the correct observation is I, II and IV.
Related Articles
- Sodium hydrogen carbonate, when added to acetic acid, evolves a gas. Which of the following statements are true about the gas evolved?It turns lime water milkyIt extinguishes a burning splinterIt dissolves in a solution of sodium hydroxideIt has a pungent odour(a) (i) and (ii)(b) (i), (ii) and (iii)(c) (ii), (iii) and (iv)(d) (i) and (iv)
- Which of the following are compounds?(i) CO (ii) No(iii) NO (iv) Co(a) (i) and (ii)(b) (ii) and (iii)(c) (i) and (iii)(d) (ii) and (iv)
- Consider the list of terms given below:$(i)$. Tsunami $(ii)$. Landslides$(iii)$. Floods $(iv)$. LightningEarthquakes can cause$(a)$. $(i)$, $(ii)$ and $(iii)$ $(b)$. $(ii)$ and $(iv)$ $(c)$. $(ii)$, $(iii)$ and $(iv)$ $(d)$. $(iii)$ and $(iv)$
- A list of mediums is given below$(i)$. Wood $(ii)$. Water$(iii)$. Air $(iv)$. VacuumIn which of these mediums can sound travel?$(a)$. $(i)$. and $(ii)$$(b)$. $(i)$., $(ii)$. and $(iii)$$(c)$. $(iii)$. and $(iv)$$(d)$. $(ii)$., $(iii)$. and $(iv)$
- Given below from (i) to (iv) are some food items.(i) Boiled and mashed potato(ii) Glucose solution(iii) A slice of bread(iv) Mustard oilWhich of the above will give blue-black colour when tested with iodine?(a) (i) and (ii)(b) (i) and (iii)(c) (ii) and (iii)(d) (iii) and (iv)
- Identify the unsaturated compounds from the followingPropanePropenePropyneChloropropane(a) (i) and (ii) (b) (ii) and (iv)(c) (iii) and (iv) (d) (ii) and (iii)
- Which of the following are homogeneous in nature?icewoodsoilair(a) (i) and (iii)(b) (ii) and (iv)(c) (i) and (iv) (d) (iii) and (iv)
- Which of the following are also considered to be the states of matter?(i) Plasma (ii) Platelets(iii) BEC (iv) BHC(a) (i) and (ii)(b) (ii) and (iii)(c) (i) and (iii)(d) (ii) and (iv)
- Which of the following are not ionic compounds?KClHClCCl4NaCl(a) (i) and (ii)(b) (ii) and (iii)(c) (iii) and (iv)(d) (i) and (iii)
- Which of the following are the correct characteristics of isotopes of an element?(i) same atomic mass(ii) same atomic number(iii) same physical properties(iv) same chemical properties(a) (i), (ii) and (iv)(b) (ii), (iii) and (iv)(c) (ii) and (iii)(d) (ii) and (iv)
- Write down the formulae of(i) Sodium oxide(ii) Aluminium chloride(iii) Sodium sulfide(iv) Magnesium hydroxide.
- Which of the following are chemical changes?(i) decaying of wood(ii) burning of wood(iii) sawing of wood(iv) hammering of a nail into wood(a) (i) and (ii) (b) (ii) and (iii)(c) (iii) and (iv) (d) (i) and (iv)
- The heteroatoms present in CH3 — CH2 — O — CH2— CH2Cl areoxygencarbonhydrogenchlorine(a) (i) and (ii)(b) (ii) and (iii)(c) (iii) and (iv)(d) (i) and (iv)
- Which of the following statements about the given reaction are correct?3Fe (s) + 4H2O (g) → Fe3O4 (s) + 4 H2 (g) (i) Iron metal is getting oxidised (ii) Water is getting reduced (iii) Water is acting as reducing agent (iv) Water is acting as oxidising agent (a) (i), (ii) and (iii) (b) (ii) and (iv) (c) (i), (ii) and (iv) (d) (ii) and (iv)
Kickstart Your Career
Get certified by completing the course
Get Started
Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies