National Science Olympiad Forum By SOF Olympiad Trainer
  1. Home
  2. /  Forum

User Forum

Ask Your Question
Nayan Raj Dutta from DELHI PUBLIC SCHOOL, Duliajan
Subject :NSO    Class : Class 2

Ans 1:

Mridu from st pauls, bangalore
Class : Class 3
IT IS A VERY VERY WRONG QUESTION

Post Your Answer

arpit12345 from Ryan International School, New Delhi
Subject :NSO    Class : Class 10

Which of the following statements are incorrect?
I. Reactivity of Al decreases if it is dipped in nitric acid.
II. Carbon can reduce the oxides of Na and Mg.
III. NaCl is a good conductor of electricity in solid state.
IV. Metals like K, Ca and Mg are always found in free state in nature.

A I, II and III only
B II, III and IV only
C I and III only
D II and III only


common salt can never conduct electricity in solid state

Ans 1:

Annapurna Bulusu from AcS, Delhi
Class : Class 10
B) II,III,IV CARBON can reduce oxides of metals lower in the activity series. K, Ca and Mg are high in the activity series so they are very reactive so they can not be found in free state easily.

Post Your Answer

devarchan Sarkar from Aditya Birla Public School, Bharuch
Subject :NSO    Class : Class 6

Ans 1:

Anish Bharadwaj from Delhi public school , Singapore
Class : Class 8
Ans is D

Post Your Answer

devarchan Sarkar from Aditya Birla Public School, Bharuch
Subject :NSO    Class : Class 6

Ans 1:

Bhanusree ANNE from calorx public school, MUNDRA, KUTCH
Class : Class 6
potato and ghee

Post Your Answer

Agastya from NCS Arakkonam, Chennai
Subject :NSO    Class : Class 5

Ans 1:

Sarang Shete from Amanora School, Pune
Class : Class 5

Post Your Answer

devarchan Sarkar from Aditya Birla Public School, Bharuch
Subject :NSO    Class : Class 6

Ans 1:

Parth Gupta from Presidium Gurgaon, Gurgaon
Class : Class 6

Ans 2:

devarchan Sarkar from Aditya Birla Public School, Bharuch
Class : Class 7

Post Your Answer

devarchan Sarkar from Aditya Birla Public School, Bharuch
Subject :NSO    Class : Class 6

Ans 1:

Mihika Raut from ST JOSEPHS SCHOOL, RIHAND NAGAR
Class : Class 7

Ans 2:

PRANEEL PRIYASH PANDA from AECS NARORA, BULANDSHAHR
Class : Class 6
It will ten centimetres because the length of this is 5 cm [7-2] .

Post Your Answer

devarchan Sarkar from Aditya Birla Public School, Bharuch
Subject :NSO    Class : Class 6

Post Your Answer

arpit12345 from Ryan International School, New Delhi
Subject :NSO    Class : Class 10

Observe the given experimental set-up carefully.
image
Which of the following could be the possible observation and inference drawn?

A The solution becomes blue-green due to formation of copper oxide, P is acidic.
B The solution becomes blue-green due to formation of copper chloride, P is basic.
C The solution becomes white due to formation of calcium hydroxide, P is basic.
D The solution becomes white due to formation of calcium oxide, P is acidic.


the correct answer should be (b) because copper cant displace h2 from HCl

Ans 1: (Master Answer)

Admin from revisewise, Noida
Class : Class 1
Yes, the correct answer is B.

Post Your Answer

Sarthak Gupta from DPS, Haryana
Subject :NSO    Class : Class 4

Ans 1:

PRAGWANSH JENA from DELHI PUBLIC SCHOOL, Raipur
Class : Class 5

Ans 2:

SHAH HITANSH JINESH from S H KHARAWALA, AHMEDABAD
Class : Class 6
The Answer is C. NOW THE QUESTION IS HOW? THE ANSWER IS THE MACHINES SHOWN IN PICTURE A,B,D RUNS BY MUSCULAR . FORCE. THE OPTION C RUNS BY MOTOR.

Ans 3:

Bharghavi V from Vedavalli vidyalaya senior secondary school , Walajapet
Class : Class 4
C auto motor other we should ride

Ans 4:

AADRITA BISWAS from Adamas World School, Kolkata
Class : Class 2

Ans 5:

Saarth Agrawal from Podar International School , Mumbai
Class : Class 5
c

Ans 6:

Malavya Chaturvedi from Study Hall, Lucknow
Class : Class 5
Answer is C

Post Your Answer