Question 1 :
Balance the following chemical equations: $NaCl + AgNO_{3} \rightarrow AgCl + NaNO_{3}$

Question 3 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d22273b230584979ba8.JPG' /> In the above figure, identify the carbon compound.

Question 4 :
Sulphur and Nitrogen oxides are the major products of combustion of hydrocarbons. Is it TRUE OR FALSE?

Question 6 :
A solution turns red litmus blue, its pH is likely to be

Question 7 :
What is the highest total resistance that can be secured by combinations of four coils of resistance 4 $\Omega$, 8 $\Omega$, 12 $\Omega$, 24 $\Omega$?

Question 8 :
The resistance of an electrical component remains constant while the potential difference across the two ends of the component decreases to half of its former value. What change will occur in the current through it?

Question 11 :
Where do plants get each of the raw materials required for photosynthesis?

Question 13 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19cf1273b230584979b71.png' /> In the above arrangement, a circular loop placed in a plane perpendicular to the plane of paper carries a current when the key is ON. The current as seen from points A and B (in the plane of paper and on the axis of the coil) is anti clockwise and clockwise respectively. The magnetic field lines point from B to A. The N-pole of the resultant magnet is on the face close to

Question 14 :
State TRUE or FALSE. Bicycle dynamos, car alternators and Power House generators are the sources of direct current.

Question 15 :
Which one of the following metals is the most reactive and stored in kerosene?

Question 16 :
Which among the following alloys contain non-metal as one of its constituents?

Question 17 :
Use Mendeleev's periodic table to predict the formulae for the oxides of the elements 'K'.

Question 18 :
What were the criteria used by Mendeleev in creating his periodic table?

Question 20 :
Which one of the following forms of energy leads to least environmental pollution in the process of its harnessing and utilisation?