Home
Class 10
CHEMISTRY
A student prepared 20% NaOH solution in ...

A student prepared 20% NaOH solution in a beaker containg water. The observation made by him are as follows :
(i) NaOH are in the form of pellets.
(ii) It dissolves readily in water.
(iii) The beaker appears cold from outside.
(iv) Red litmus paper turns blue when dipped in the solution.
The correct observation are :

A

i,ii,iii

B

i,iv,iii

C

iii, iv,i

D

i,ii and iv

Text Solution

Verified by Experts

The correct Answer is:
D
i,ii and iv
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • ACIDS, BASES, AND SALTS

    ZEN PUBLICATION|Exercise ZEN ADDITOINAL QUESTIONS SECTIONS (Very Short Answer Type Questions )|5 Videos

  • ACIDS, BASES, AND SALTS

    ZEN PUBLICATION|Exercise ZEN ADDITOINAL QUESTIONS SECTIONS (Short Answer Type Questions - I)|26 Videos

  • ACIDS, BASES, AND SALTS

    ZEN PUBLICATION|Exercise Questions Sections (Textual Exercise)|15 Videos

  • CARBON AND ITS COMPOUNDS

    ZEN PUBLICATION|Exercise ACTIVITY|2 Videos

Similar Questions

Explore conceptually related problems

Sugandha prepares HCl gas in her school laboratory using certain chemicals, She puts both dry and wet blue litmus paper in contact with the gas. (i) Name the reagents used by Sugandha to prepare HCl gas. (ii) State the colour changes observed with the dry and wet blue litmus paper. Show the formation of ions when HCl gas combines with water.

A student takes three beakers A,B and C filled with aqueous solution of glucose, alcohol and hydrochloric acid respectively as shown in the following figure. (i) State your observations in terms of glowing of bulb when the switch is on. (ii) Justify your observations by giving reason in each case. (iii) Mention the change noticed with appropriate reason if the content of beaker B is replaced by sodium hydroxide solution.

Knowledge Check

  • A student of 10.2 made the following observations in his laboratory : (i) Copper metal did not react with 1M Pb (NO_3)_2 solution. (ii) Lead metal dissolved in a 1M AgNO_3 solution and Ag metal is crystallised. (iii) Silver metal did not react with 1 M Cu(NO_3)_2 solution. The order of decreasing reducing character of these metals is

    A
    `Cu, Ag,Pb`
    B
    Pb, Ag, Cu
    C
    Cu, Pb, Ag
    D
    Pb, Cu , Ag

  • Arrange the following events in a correct order that explains the mass flow of materials in the phloem? (i) Water diffuses into the sieve tube elements. (ii) Leaf cells produce sugar by photosynthesis. (iii) Solutes are actively transported into the sieve elements. (iv) Sugar is transported from cell to cell in the leaf. (v) Sugar moves down the stem.

    A
    (ii) - (iv) - (iii) - (i) - (v)
    B
    (ii) - (iv) - (i) - (iii) - (v)
    C
    (i) - (ii) - (iii) - (iv) - (v)
    D
    (iv) - (ii) - (i) - (iii) - (v)

  • Arrange the following events in a correct order that explains the mass flow of materials in the phloem? (i) Water diffuses into the sieve tube elements. (ii) Leaf cells produce sugar by photosynthesis. (iii) Solutes are actively transported into the sieve elements. (iv) Sugar is transported from cell to cell in the leaf. (v) Sugar moves down the stem.

    A
    (ii) - (iv) - (iii) - (i) - (v)
    B
    (ii) - (iv) - (i) - (iii) - (v)
    C
    (i) - (ii) - (iii) - (iv) - (v)
    D
    (iv) - (ii) - (i) - (iii) - (v)

    • Similar Questions

    Explore conceptually related problems

    (i) A non-metal X exists in two different forms Y and Z. Y is the hardest natural substance whereas Z is a good conductor of electricity. Identify X, Y, Z. (ii) A element, X, on reaction with oxygen forms an oxide XO_(2) . The Oxide when dissolved in water turns blue litmus red. State whether element X is a metal or a non-metal. (ii) Name the metal which is alloyed with copper to make bronze.

    (i) Define universal indicator. For what purpose it is used? (ii) Two solutions A and B have pH values of 3.0 and 9.5 respectively. Which of these will turn litmus solution from blue to red and which will turn phenolphthalein from colourless to pink? (iii) What is a neutral substance. WHat colour will you get when you add a few drops of universal you get when you add a few drops of universal indicator of a test tube containing distilled water?

    Which of the following statements are true/false? (i) The blood transports CO_2 comparatively easily because of its higher solubility. (ii) Approximately 8-.9% of CO_2 is transported being dissolved in the plasma of blood. (iii) The carbon dioxide produced by the tissues, diffuses passively into the bloodstream and passes into red blood corpuscles and react with water to form H_2CO_3 (iv) The oxyhaemoglobin (HbO_2) of the erythrocytes is basic. (v) The chloride ions diffuse from plasma into the erythrocytes to maintain ionic balance.

    Home
    Profile