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

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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

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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.

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

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

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

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

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

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

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

Ans 2:

Parth Gupta from Presidium Gurgaon, Gurgaon
Class : Class 6

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

Ans 1:

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

Ans 2:

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

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

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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.

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